Simulation analysis method and device for abnormal sound of interior trim part, test equipment and test system

Abstract

The invention relates to an interior trim part abnormal sound simulation analysis method and device, test equipment and a test system. The simulation analysis method comprises the steps that an abnormal sound simulation analysis model is adopted to conduct simulation analysis on a target friction position corresponding to a target interior trim part, and the maximum relative displacement corresponding to the target friction position is determined; performing friction testing on a target friction position corresponding to the target interior trim part, and determining a friction abnormal sound displacement interval corresponding to the target friction position; and according to the maximum relative displacement corresponding to the target friction position and the friction abnormal sound displacement interval, the abnormal sound risk probability is determined. The method can quickly determine the abnormal sound risk of the interior trim part in the design stage.

Description

Technical Field

[0001] The invention belongs to the technical field of abnormal noise control of automobile interior decoration parts, and specifically relates to an abnormal noise simulation analysis method, device, test equipment and test system for interior decoration parts. Background Art

[0002] With the rapid development of the automobile market and the improvement of people's living standards, people have higher and higher requirements for the comfort of travel tools. When the car is driving, the abnormal noise of the interior parts will seriously affect the driving comfort of the passengers. The abnormal noise is harsh or noisy, which affects the riding experience. The abnormal noise will give passengers or drivers a feeling of low quality or instability. Therefore, reducing the abnormal noise of automobile interior parts plays an important role in improving driving comfort, improving quality, and maintaining reputation and brand image. However, there is little research on the abnormal noise of automobile interior parts in the prior art, and it is difficult to quickly determine the risk of abnormal noise of interior parts during the design stage. Summary of the invention

[0003] The present invention provides a method, device, test equipment and test system for simulating and analyzing abnormal noise of interior decoration parts, so as to solve the problem that it is difficult to quickly determine the risk of abnormal noise of interior decoration parts in the design stage in the prior art.

[0004] The present invention provides a simulation analysis method for abnormal noise of interior decoration parts, the simulation analysis method comprising:

[0005] The abnormal noise simulation analysis model is used to perform simulation analysis on the target friction position corresponding to the target interior part to determine the maximum relative displacement corresponding to the target friction position;

[0006] Performing a friction test on a target friction position corresponding to the target interior trim component to determine a friction abnormal noise displacement interval corresponding to the target friction position;

[0007] The abnormal noise risk probability is determined according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

[0008] Preferably, before the abnormal noise simulation analysis model is used to perform simulation analysis on the target friction position corresponding to the target interior part and the maximum relative displacement corresponding to the target friction position is determined, the abnormal noise simulation analysis method for the interior part further comprises:

[0009] A compression test is performed on the interior parts of the entire vehicle to determine a target interior part and a target friction position corresponding to the target interior part.

[0010] Preferably, the pressing test is performed on the interior parts of the whole vehicle to determine the target interior parts and the target friction position corresponding to the target interior parts, including:

[0011] Performing a compression test on at least one vehicle interior component to obtain compression test data corresponding to each of the vehicle interior components;

[0012] Analyze the compression test data corresponding to each of the vehicle interior parts to obtain the compression noise score corresponding to each of the vehicle interior parts;

[0013] Determine the vehicle interior parts with the pressing abnormal sound score less than the first score threshold as target interior parts;

[0014] Analyzing the contact gap between the target interior component and an adjacent interior component to determine a target friction position corresponding to the target interior component;

[0015] Wherein, the adjacent interior decoration part is an interior decoration part adjacent to the target interior decoration part.

[0016] Preferably, the adopting of the abnormal noise simulation analysis model to simulate and analyze the target friction position corresponding to the target interior part to determine the maximum relative displacement corresponding to the target friction position includes:

[0017] Using an abnormal noise simulation analysis model to perform simulation analysis on a target friction position corresponding to the target interior component, and obtaining first vibration data corresponding to the target interior component and second vibration data corresponding to an adjacent interior component;

[0018] Determining a maximum relative displacement corresponding to the target friction position according to first vibration data corresponding to the target interior component and second vibration data corresponding to an adjacent interior component;

[0019] Wherein, the adjacent interior decoration part is an interior decoration part adjacent to the target interior decoration part.

[0020] Preferably, performing a friction test on a target friction position corresponding to the target interior component to determine a friction abnormal noise displacement interval corresponding to the target friction position includes:

[0021] Based on at least two friction test conditions, a friction test is performed on a target friction position corresponding to the target interior component, and a minimum friction abnormal noise displacement corresponding to each friction test condition is obtained respectively;

[0022] The friction noise displacement interval corresponding to the target friction position is determined according to the minimum friction noise displacement corresponding to at least two friction test conditions.

[0023] Preferably, the friction test is performed on the target friction position corresponding to the target interior part based on at least two friction test conditions, and the minimum friction noise displacement corresponding to each friction test condition is obtained respectively, including:

[0024] Based on at least two friction test conditions, performing a friction test on a target friction position corresponding to the target interior component, and respectively obtaining friction test data corresponding to each of the friction test conditions;

[0025] Analyzing the friction test data corresponding to each of the friction test conditions to determine the stick-slip pulse frequency corresponding to each of the friction test conditions;

[0026] According to the stick-slip pulse frequency corresponding to each friction test condition, the minimum friction abnormal noise displacement corresponding to each friction test condition is obtained.

[0027] Preferably, determining the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position includes:

[0028] If the maximum relative displacement is less than the lower limit of the friction abnormal noise displacement interval, the abnormal noise risk probability is determined to be the first risk probability;

[0029] If the maximum relative displacement is greater than the upper limit value of the friction abnormal noise displacement interval, the abnormal noise risk probability is determined to be the second risk probability;

[0030] If the maximum relative displacement is in the friction abnormal noise displacement interval, the abnormal noise risk probability is calculated according to the maximum relative displacement and the lower limit value and the upper limit value of the friction abnormal noise displacement interval.

[0031] Preferably, before performing a press test on the interior parts of the whole vehicle to determine the target interior parts and the abnormal noise friction position corresponding to the target interior parts, the interior parts abnormal noise simulation analysis method further includes:

[0032] Conduct damping test analysis on the interior parts of the vehicle to obtain the modal damping corresponding to the interior parts of the vehicle;

[0033] Conduct vibration test analysis on the interior parts of the vehicle to obtain the dynamic stiffness of the fasteners corresponding to the interior parts of the vehicle;

[0034] According to the modal damping and fastener dynamic stiffness corresponding to the vehicle interior parts, an abnormal noise simulation analysis model is constructed.

[0035] Preferably, the damping test analysis of the vehicle interior parts to obtain the modal damping corresponding to the vehicle interior parts includes:

[0036] Applying a sinusoidal wave excitation within a preset frequency range to the vehicle interior parts to obtain a test acceleration corresponding to the sinusoidal wave excitation;

[0037] Constructing a transfer function according to the sinusoidal wave excitation and the test acceleration, and determining a Rayleigh damping coefficient;

[0038] Based on the Rayleigh damping coefficient, the modal damping corresponding to the interior trim of the entire vehicle is determined.

[0039] The present invention also provides an interior decoration part abnormal noise simulation analysis device, comprising:

[0040] A target friction position module, the target friction position module is used to perform a press test on the interior trim of the entire vehicle to determine a target interior trim and a target friction position corresponding to the target interior trim;

[0041] A maximum relative displacement module, the maximum relative displacement module is used to perform simulation analysis on a target friction position corresponding to the target interior part using an abnormal noise simulation analysis model to determine a maximum relative displacement corresponding to the target friction position;

[0042] A friction noise displacement interval module, wherein the friction noise displacement interval module is used to perform a friction test on a target friction position corresponding to the target interior part to determine a friction noise displacement interval corresponding to the target friction position;

[0043] The abnormal noise risk probability module is used to determine the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

[0044] The present invention also provides a testing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned simulation analysis method when executing the computer program.

[0045] The present invention also provides a test system, which includes the test equipment as described above and a test bench for applying simulated working conditions to the tested interior parts when the test equipment is working, the test bench including a vibration table, an excitation end, a tooling beam and a tooling connecting plate, the tested interior parts are mounted on the tooling beam through the tooling connecting plate, an acceleration sensor is attached to the surface of the tested interior parts, the excitation end is detachably mounted on the vibration table, the end of the excitation end is in contact with and connected to the surface of the tested interior parts, a plurality of mounting positions are arranged on the tooling beam, one end of the tooling connecting plate is detachably connected to one or more mounting positions, the other end of the tooling connecting plate is detachably connected to the mounting hole of the tested interior parts, the excitation end includes a plurality of loading heads of different shapes and materials, the vibration table emits harmonic vibration and transmits it to the excitation end.

[0046] The above-mentioned simulation analysis method, device, test equipment and test system for abnormal noise of interior parts combine the maximum relative displacement corresponding to the target friction position obtained by simulation analysis and the test with the friction abnormal noise displacement range corresponding to the target friction position obtained by test bench test, and determine the abnormal noise risk probability based on the maximum relative displacement corresponding to the target friction position and the friction abnormal noise displacement range, thereby being able to quickly determine the abnormal noise risk of interior parts in the design stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a flow chart of a method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0048] Figure 2 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0049] Figure 3 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0050] Figure 4 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0051] Figure 5 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0052] Figure 6 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0053] Figure 7 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0054] Figure 8 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0055] Fig. 9 is another flow chart of the method for simulating and analyzing abnormal noise of interior decoration parts provided by an embodiment of the present invention;

[0056] Fig.10 is a structural schematic diagram of a simulation analysis device provided by an embodiment of the present invention;

[0057] Fig.11 is a schematic diagram of the structure of a test device provided in an embodiment of the present invention;

[0058] Fig.12 It is a schematic diagram of the overall structure of the test system detection bench provided by an embodiment of the present invention;

[0059] Fig.13It is a schematic diagram of an Hf curve of one of the examples given in an embodiment of the present invention.

[0060] Among them, 1. Vibration table; 2. Acceleration sensor; 3. Fixing angle seat of the table; 4. Fixing bolts; 5. Tooling beam; 6. Excitation end; 7. Tooling connecting plate. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The simulation analysis method for abnormal noise of interior parts provided in the embodiment of the present invention can be applied to a test device installed with an application program, and is used to reduce or eliminate the abnormal noise of interior parts during the design stage through structural design. The test device can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, and portable wearable devices.

[0065] In one embodiment, if Figure 1 As shown, a method for simulating and analyzing abnormal noise of interior decoration parts is provided, comprising the following steps:

[0066] Step S101: using an abnormal noise simulation analysis model to perform simulation analysis on a target friction position corresponding to a target interior trim component to determine a maximum relative displacement corresponding to the target friction position.

[0067] Step S102: performing a friction test on a target friction position corresponding to a target interior trim component to determine a friction noise displacement interval corresponding to the target friction position.

[0068] Step S103: determining the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

[0069] Among them, the target interior parts are the interior parts that may have large abnormal noises that are screened out from the interior parts of the whole vehicle, and the interior parts of the whole vehicle are the interior parts installed on the car. The target friction position is the abnormal noise friction position that may have large abnormal noises that is screened out and analyzed from the multiple abnormal noise friction positions corresponding to the target interior parts. The abnormal noise simulation analysis model is a model specifically used for abnormal noise analysis that is determined after the target abnormal noise analysis parameters set by the user are input into the simulation analysis model.

[0070] As an example, in step S101, the test equipment performs simulation analysis on the target friction position corresponding to the target interior part according to a series of parameters and definitions pre-set in the abnormal noise simulation analysis model, for the input of the abnormal noise simulation analysis model, including but not limited to the simulated driving state, so that the abnormal noise simulation analysis model can simulate the relative motion state between the target interior part and the adjacent interior part corresponding to the target friction position, and select the maximum relative displacement under the relative motion state as the maximum relative displacement, and the above relative motion state includes but is not limited to variable speed motion, uniform speed motion, swing, collision, displacement, vibration, etc. Therefore, when the working condition under a specific simulated driving state is input, the relative motion state between the target interior part and the adjacent interior part at the target friction position can be obtained through the abnormal noise simulation analysis model, and the maximum relative displacement under the relative motion state is selected as the maximum relative displacement.

[0071] As an example, in step S102, a simulation test is performed on the materials of two interior parts at the target friction position: the materials of the two interior parts are relatively moved on the test equipment at a certain collision frequency or contact pressure, or rubbed back and forth at a certain frequency, the size of the abnormal sound is tested, and the relative displacement that produces the abnormal sound is recorded, so as to obtain the displacement range of the friction abnormal sound.

[0072] As an example, in step S103, the maximum relative displacement is compared with the friction abnormal noise displacement interval, that is, the value of the maximum relative displacement is compared with the friction abnormal noise displacement interval to see whether it falls within the friction abnormal noise displacement interval to determine whether abnormal noise will occur. In this example, when the maximum relative displacement is less than the lower limit of the friction abnormal noise displacement interval, the abnormal noise risk probability is at a low level; when the maximum relative displacement is in the friction abnormal noise displacement interval, there is an abnormal noise risk, and the abnormal noise risk probability is a calculable value between a lower level and a higher level; when the maximum relative displacement is greater than the upper limit of the friction abnormal noise displacement interval, the abnormal noise risk probability is at a higher level.

[0073] In this embodiment, when the maximum relative displacement is in the friction noise displacement interval, the working condition corresponding to the maximum relative displacement in the noise simulation analysis model is compared with the minimum friction noise displacement measured under the closest working condition in the test equipment test. The risk is finally determined to exist when the maximum relative displacement is greater than the minimum friction noise displacement measured under the corresponding working condition. This allows for the rapid determination of the noise risk of interior parts during the design phase, provides a certain direction for the subsequent analysis of noise risks, and facilitates the formulation of effective measures.

[0074] In this embodiment, the maximum relative displacement corresponding to the target friction position of the target interior part is determined through simulation analysis, the friction noise displacement interval corresponding to the target friction position of the target interior part is determined through friction testing, and the noise risk probability is determined based on the maximum relative displacement corresponding to the target friction position and the friction noise displacement interval, so that the noise risk of the interior part can be quickly determined in the design stage.

[0075] In one embodiment, before step S101, that is, before the abnormal noise simulation analysis model is used to perform simulation analysis on the target friction position corresponding to the target interior part to determine the maximum relative displacement corresponding to the target friction position, the interior part abnormal noise simulation analysis method also includes: performing a press test on the interior parts of the entire vehicle to determine the target interior part and the target friction position corresponding to the target interior part.

[0076] As an example, the test equipment can obtain the press test data collected by the press test on the whole vehicle interior parts, analyze the press test data, and determine that when the pressed whole vehicle interior parts have abnormal noise, the whole vehicle interior parts with abnormal noise can be determined as the target interior parts, and the target friction position corresponding to the target interior parts can be analyzed. The determination of the target friction position can be determined based on the gap, relative movement and relative displacement between each interior part in the abnormal noise simulation analysis model. For example, when two interior parts are in contact (or the gap is small enough) and there is a difference in the relative movement direction or displacement direction, relative friction occurs between the two, and the contact position is the target friction position. In addition, the target friction position can be obtained through actual experience or actual testing. When the vehicle models with the same or similar interior parts structure have more frequent abnormal noises, the position can be listed as the target friction position; the position where the abnormal noise occurs in the actual test can also be listed as the target friction position.

[0077] In one embodiment, if Figure 2 As shown, a press test is performed on the interior parts of the entire vehicle to determine the target interior parts and the target friction positions corresponding to the target interior parts, including:

[0078] Step S201: Perform a press test on all interior trim parts of the vehicle, and obtain press test data corresponding to each interior trim part of the vehicle.

[0079] Step S202: Analyze the compression test data corresponding to each vehicle interior component to obtain the compression noise score corresponding to each vehicle interior component.

[0080] Step S203: Determine the vehicle interior parts with abnormal pressing noise scores less than a first score threshold as target interior parts.

[0081] Step S204: analyzing the contact gap between the target interior component and the adjacent interior component to determine the target friction position corresponding to the target interior component.

[0082] Wherein, the adjacent interior decoration part is an interior decoration part adjacent to the target interior decoration part.

[0083] Among them, the pressing test data is the performance data of the interior parts collected when the interior parts are pressed, including but not limited to the abnormal noise score, abnormal noise decibel value, pressing method, pressing area and pressing force, etc.

[0084] As an example, in step S201, multiple areas of the vehicle interior parts are pressed in different pressing ways, including different pressing forces and / or different pressing areas, and the pressure sensor is used to collect the pressing test data of each vehicle interior part. Based on the use scenario of the occupants actually touching the interior parts, the daily actions of the occupants touching the interior parts are simulated, and the interior parts at a certain position are pressed with different pressing forces and pressing areas. The contact actions of passengers on interior decoration parts include but are not limited to: single-finger pressing, three-finger pressing, palm pressing, elbow pressing and leg pressing, etc. The positions of interior decoration parts that can be touched by single-finger pressing, three-finger pressing, palm pressing, elbow pressing and leg pressing are different. For example, the interior decoration parts that can be touched by leg pressing are generally located in the lower half of the interior space of the car. Single-finger pressing generally acts on the interior decoration parts that can be reached by the passengers' arms when they are sitting or leaning slightly. Three-finger pressing generally acts on the interior decoration parts that can be reached by the passengers' arms when they are sitting or leaning slightly. Palm pressing generally acts on the interior decoration parts above the front panel of the car. Elbow pressing generally acts on the interior decoration parts at the armrest box and the door frame. The positions of interior decoration parts that can be touched by the above contact actions can be called key focus positions. Depending on the pressing method, the pressing force and pressing area are also different.

[0085] As a preferred solution, by laying pressure sensors on the surface of interior decoration parts, since the surface of interior decoration parts is irregular and the shapes of key focus positions are not uniform, flexible resistive film pressure sensors can be used and posted on the surface of interior decoration parts. The interior decoration parts can be pressed using daily contact actions to obtain the pressing force and pressing area.

[0086] In this example, in an anechoic room or semi-anechoic room, a flexible resistive film pressure sensor is used to collect compression test data of interior parts under different compression methods, load and contact area conditions, and then a ten-point scoring method is used, but not limited to, to evaluate the degree of abnormal noise and assign a score.

[0087] Furthermore, the following is an example of a squeak and rattle evaluation table based on a ten-point scoring system:

[0088] Unnoticeable (10): The noise is barely perceptible or has no effect at all;

[0089] Very slight (9): The abnormal noise exists, but has little noticeable impact on normal operation or use;

[0090] Mild (8): The noise is detectable and slightly interferes with normal operation or use;

[0091] Somewhat noticeable (7): The noise is relatively noticeable and may cause noticeable or slight discomfort;

[0092] Obvious (6): The abnormal noise is obvious and has a certain impact on operation or use;

[0093] Moderate (5): The noise is noticeable and causes discomfort, requiring additional attention and treatment;

[0094] Obvious (4): The abnormal noise is very obvious and causes great trouble to the operation or use;

[0095] Significant (3): The abnormal noise is significant and persists, seriously interfering with normal operation or use;

[0096] Severe (2): The abnormal noise seriously affects normal work or use and is difficult to tolerate;

[0097] Extremely severe (1): The noise is so strong that it completely prevents operation or use.

[0098] In this example, the pressure and contact area are collected by an evaluator who is equivalent to the 95th percentile dummy. The evaluator who is equivalent to the 95th percentile dummy represents the body shape and size of most people in the entire population, so their data is more representative and can accurately reflect the distribution and changes of pressure and contact area in real use. When selecting the evaluator, the diversity of body shape is taken into account, and the standard human body measurement data is referenced, which more accurately reflects the impact of different body shapes on pressure and contact area, and improves the accuracy and reliability of the model.

[0099] As an example, in step S202, the test equipment obtains the pressing test data corresponding to each vehicle interior part, that is, analyzes the pressing test data corresponding to each vehicle interior part according to different indicators, and obtains the pressing abnormal sound score corresponding to each vehicle interior part. The pressing abnormal sound score calculation formula is as follows:

[0100]

[0101] Among them, a i is the score of each item, b i is the weight of each item, and I is the subjective evaluation score of the abnormal noise caused by pressing on the vehicle interior parts.

[0102] Furthermore, each score a i Scoring can be done as follows:

[0103] According to the numerical value of the score, there are six performance states: "excellent", "good", "acceptable", "disappointing", "poor" and "unacceptable". For example, excellent is 8-10 points; good is 7-8 points; acceptable is 6-7 points; disappointing is 4-6 points; poor is 2-4 points; unacceptable is 0-3 points.

[0104] Weight index b i Assign as follows:

[0105] The weight of an important position is 20, the weight of a secondary position is 10, and the weight of an ordinary position is 5.

[0106] As a preferred solution, the weight index b i In addition to the weight of the pressing position, the weight factor generated by the frequency of the pressing method should also be considered when allocating the weights. For example, the weight of the frequent pressing method is 20 (first level), the weight of the occasionally occurring pressing method is 10 (second level), and the weight of the only possible pressing method is 5 (third level). When a position produces an abnormal sound under a certain pressing method, the abnormal sound is first scored, and then its weight is evaluated. The weights of the two aspects of the comprehensive position importance and the frequency of the pressing method are averaged to obtain the comprehensive weight of this score as the weight index b. i For example, when a certain position makes an abnormal sound under a certain pressing method, the position importance weight is 10, the pressing method frequency weight is 5, and the comprehensive weight is the average of the two, that is, 7.5.

[0107] The first score threshold is a pre-set first score value. For example, the first score threshold is selected as 60 points, so all vehicle interior parts with a score below 60 points are taken as target interior parts.

[0108] As an example, in step S203, the vehicle interior parts with abnormal pressing noise scores less than the first score threshold are determined as target interior parts. If the abnormal pressing noise scores of each vehicle interior part obtained in step S202 are sorted from high to low, the vehicle interior parts with higher scores in the front part indicate that they are less likely to have abnormal pressing noise and have better pressing performance; the vehicle interior parts with lower scores in the back part indicate that they are more likely to have abnormal pressing noise and have worse pressing performance. A certain percentage of the reciprocal score or an absolute score is selected as the first score threshold. The vehicle interior parts with scores less than the first score threshold have poor performance and cannot meet the pressing requirements. They need to be analyzed and the operation of eliminating abnormal noise is performed as target interior parts.

[0109] The first gap threshold is a preset gap value. As a preferred solution, the first gap threshold is selected as 0.5 mm.

[0110] As an example, in step S204, the contact gap between the target interior part and the adjacent interior part is analyzed to determine the target friction position corresponding to the target interior part. When the target interior part is obtained, its adjacent interior parts are also obtained, and all gaps between the target interior part and the adjacent interior parts are obtained by physical measurement or three-dimensional simulation according to the design size and installation size. All points where the gap between the target interior part and the adjacent interior part is less than the first gap threshold are used as the target friction position corresponding to the target interior part, so as to analyze the target friction position later.

[0111] In this embodiment, the load and contact area of ​​different areas and different pressing methods are collected by pressure sensors, and the degree of abnormal noise is evaluated by a ten-point scoring method combined with the perceived importance of different areas. A subjective evaluation method is established to objectively consider the actual use scenario, and to reasonably load different pressing methods to reduce the differences and uncertainties of subjective evaluation. Through subjective evaluation, the target interior parts can be quickly determined in the design test stage, thereby determining the target friction position.

[0112] In one embodiment, if Figure 3 As shown, step S101, i.e., using the abnormal noise simulation analysis model to perform simulation analysis on the target friction position corresponding to the target interior trim part to determine the maximum relative displacement corresponding to the target friction position, includes:

[0113] Step S301: using an abnormal noise simulation analysis model to perform simulation analysis on a target friction position corresponding to a target interior component, and obtaining first vibration data corresponding to the target interior component and second vibration data corresponding to an adjacent interior component.

[0114] Step S302: determining a maximum relative displacement corresponding to a target friction position according to first vibration data corresponding to a target interior decoration component and second vibration data corresponding to an adjacent interior decoration component.

[0115] The adjacent interior part is an interior part adjacent to the target interior part.

[0116] As an example, in step S301, in the abnormal noise simulation analysis model, a certain excitation is input to the target friction position corresponding to the target interior part, and relative motion occurs between the target interior part and the adjacent interior part. Usually, the motion between the target interior part and the adjacent interior part is a vibration of a certain frequency. Therefore, the motion of the target interior part and the adjacent interior part is a vector, including the motion direction, motion distance (amplitude) and frequency. The motion vector of the target interior part is the first vibration data, and the motion vector of the adjacent interior part is the second vibration data.

[0117] As an example, in step S302, the first vibration data and the second vibration data include but are not limited to the frequency, amplitude and direction of vibration. After the testing equipment obtains the first vibration data and the second vibration data, the contact position between the target interior part and the adjacent interior part generates a motion trajectory under the action of excitation. A plane is determined according to the contact position between the target interior part and the adjacent interior part, and the maximum value of the motion trajectory is found in the plane, that is, the maximum relative displacement corresponding to the target friction position is determined.

[0118] The plane determined between the target interior part and the adjacent interior part is a plane between the angles of the target interior part and the motion directions of the adjacent interior part. The maximum value of the motion trajectory in the multiple selected plane positions can be used as the maximum relative displacement corresponding to the target friction position by selecting the plane multiple times.

[0119] In this embodiment, the input excitation simulates the working conditions during the actual driving process and the pressing process to obtain the maximum relative displacement. Taking into account the worst results during the actual driving process and the pressing process, subsequent abnormal noise analysis is performed under the worst results to eliminate the risk of abnormal noise as much as possible.

[0120] In one embodiment, if Figure 4 As shown, step S102, i.e., performing a friction test on a target friction position corresponding to a target interior trim part to determine a friction abnormal noise displacement interval corresponding to the target friction position, includes:

[0121] Step S401: Based on at least two friction test conditions, a friction test is performed on a target friction position corresponding to a target interior trim component, and a minimum friction noise displacement corresponding to each friction test condition is obtained.

[0122] Step S402: determining the friction noise displacement interval corresponding to the target friction position according to the minimum friction noise displacement corresponding to at least two friction test conditions.

[0123] As an example, in step S401, a set of material pairs is formed according to the materials of the two materials in contact with each other at the target friction position; when there are multiple target friction positions, multiple material pairs are formed. The material pair at the target friction position is subjected to at least two friction tests by a material stick-slip friction testing instrument to measure the minimum friction noise displacement of the material pair. In this example, the temperature, and / or humidity, and / or the positive pressure between the material pairs in at least two friction tests are different. Common instruments used to test the stick-slip friction performance of materials include tribometers and universal testing machines. A tribometer is an instrument used to measure the friction characteristics between materials. It usually simulates actual use conditions by applying pressure or force and performing relative motion. It can measure the static friction and dynamic friction between materials and provide relevant data such as the friction coefficient. The universal testing machine can also be used to measure the friction performance of materials. It is a multifunctional testing equipment that can perform various mechanical performance tests such as stretching, compression, and bending. When performing a stick-slip friction test on a material, the universal testing machine can simulate the required load and motion mode, and record the applied force and displacement to evaluate the friction performance of the material.

[0124] As an example, in step S402, at least two friction tests are performed on the above-mentioned material pairs to obtain at least two minimum friction noise displacements. All minimum friction noise displacements are compared to determine their minimum and maximum values, and the friction noise displacement range is determined based on the minimum and maximum values.

[0125] For example, considering the complexity of material friction under actual vehicles, in order to obtain a more realistic minimum friction noise displacement, different working conditions are set, including temperature, humidity, positive pressure, and relative friction speed, to obtain the minimum friction noise displacement range. The friction noise displacement range represents: the set of all minimum friction noise displacement values ​​that produce abnormal noise under different working conditions. For example, for material A and material B, under the working conditions of temperature range of 20℃-30℃, humidity range of 10%-15%, fixed positive pressure, and fixed relative friction speed, the following are measured:

[0126] Temperature 20℃, humidity 10%: minimum friction noise displacement is 0.6mm;

[0127] Temperature 20℃, humidity 15%: minimum friction noise displacement is 1.0mm;

[0128] Temperature 30℃, humidity 10%: minimum friction noise displacement is 1.2mm;

[0129] Temperature 30℃, humidity 15%: minimum friction noise displacement is 1.6mm;

[0130] It can be seen that the minimum friction noise displacements of material A and material B under the conditions of temperature range of 20℃-30℃, humidity range of 10%-15%, fixed positive pressure and fixed relative friction speed are 0.6mm, 1.0mm, 1.2mm and 1.6mm respectively. Therefore, it can be inferred that the friction noise displacement range between material A and material B is [0.6, 1.6]mm.

[0131] Based on the minimum and maximum values ​​determined by all minimum friction noise displacements, the friction noise displacement interval is determined. This interval represents that when the minimum friction noise displacement falls into the friction noise displacement interval, the material pair at the target friction position will make noise under certain specific conditions during the driving of the car.

[0132] In this embodiment, the number of friction tests performed is relatively large, usually not less than dozens of times. In these friction tests, a series of minimum friction abnormal noise displacements will be obtained, and these values ​​will vary within a range, which is the friction abnormal noise displacement range. In order to quickly determine the friction abnormal noise displacement range, based on the minimum and maximum values ​​in a series of minimum friction abnormal noise displacements obtained from dozens of friction tests, the friction abnormal noise displacement range can be quickly determined, so that subsequent abnormal noise analysis can be performed as soon as possible to improve efficiency.

[0133] In one embodiment, if Figure 5 As shown, step S401, i.e., based on at least two friction test conditions, a friction test is performed on a target friction position corresponding to a target interior part, and the minimum friction abnormal noise displacement corresponding to each friction test condition is obtained respectively, including:

[0134] Step S501: Based on at least two friction test conditions, a friction test is performed on a target friction position corresponding to a target interior component, and friction test data corresponding to each friction test condition is obtained respectively.

[0135] Step S502: Analyze the friction test data corresponding to each friction test condition to determine the stick-slip pulse frequency corresponding to each friction test condition.

[0136] Step S503: according to the stick-slip pulse frequency corresponding to each friction test condition, the minimum friction abnormal noise displacement corresponding to each friction test condition is obtained.

[0137] As an example, in step S501, first, at least two friction tests are performed to test the minimum friction noise displacement between each material pair under at least two working conditions; the two materials of the material pair are subjected to pulse relative friction under certain pressure, temperature, and humidity by using a material stick-slip friction test instrument. The friction test data includes but is not limited to the noise level RPN of each test during the friction test, and the stick-slip pulse frequency of each friction test. The noise level RPN is divided into ten levels from 1 to 10, so each friction test will obtain at least one stick-slip pulse frequency and an noise level RPN corresponding to the stick-slip pulse frequency.

[0138] As an example, in step S502, during the friction test, the abnormal noise level RPN of the material pair is identified. RPN levels 1-3 indicate that no squeak can be heard between the two materials; levels 4-5 indicate that the matching of the two materials is at the boundary and the possibility of squeak sound cannot be ruled out; levels 6-10 indicate that the matching of the two materials is poor and squeak can be clearly heard. When the abnormal noise level reaches level 6 or above, it is considered that an abnormal noise has occurred, and the working condition at this time is recorded. The stick-slip pulse frequency is extracted from the state parameters of the friction test working condition at this time, that is:

[0139]

[0140] Among them, the stick-slip pulse frequency indicates the number of abnormal sound pulses per 1mm.

[0141] As an example, in step S503, according to the stick-slip pulse frequency corresponding to each friction test condition, the minimum friction abnormal noise displacement corresponding to each friction test condition is obtained, and the minimum friction abnormal noise displacement is calculated:

[0142]

[0143] That is, the minimum friction noise displacement is the inverse of the stick-slip pulse frequency.

[0144] In this embodiment, each test can only test the minimum friction displacement under one working condition. Considering the complexity of material friction under the actual vehicle, in order to obtain a more realistic minimum friction displacement, different working conditions are set, including temperature, humidity, positive pressure, relative friction speed, etc., and tests are performed on different working conditions to obtain multiple minimum friction displacements.

[0145] For example, taking the friction test between ABS electroplated parts and PVC surface as an example, the test results are shown in the following table:

[0146]

[0147] In the friction test between ABS electroplated parts and PVC surfaces, the noise level RPN was recorded at 6 and above, and the stick-slip pulse frequency values ​​were 1.5667, 1.4083, 2.3000, and 0.7250, respectively. The corresponding minimum friction noise displacements were 0.638mm, 0.710mm, 0.435mm, and 1.379mm, respectively. When enough minimum friction noise displacements were obtained, the friction noise displacement interval was defined by the minimum and maximum values ​​of all the minimum friction noise displacements.

[0148] In this embodiment, in order to obtain the friction noise displacement range of the target friction position material under different working conditions, a series of test methods are used to obtain a sufficient number of minimum friction noise displacements that cover all working conditions as much as possible, and the friction noise displacement range is intuitively obtained through a large number of minimum friction noise displacements. The material stick-slip friction test tests the minimum friction noise displacement under different positive pressures, different loading speeds, and different temperature and humidity conditions, and the noise risk at this speed is evaluated in combination with the speed correspondence in the actual CAE analysis.

[0149] In one embodiment, if Figure 6 As shown, step S103, i.e., determining the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position, includes:

[0150] Step S601: If the maximum relative displacement is less than the lower limit of the friction abnormal noise displacement interval, the abnormal noise risk probability is determined to be the first risk probability.

[0151] Step S602: If the maximum relative displacement is greater than the upper limit of the friction noise displacement interval, the noise risk probability is determined to be the second risk probability.

[0152] Step S603: If the maximum relative displacement is within the friction abnormal noise displacement interval, the abnormal noise risk probability is calculated according to the maximum relative displacement and the lower limit and upper limit of the friction abnormal noise displacement interval.

[0153] The first risk probability is 0 or a value slightly greater than 0, and the second risk probability is 1 or a value slightly less than 1.

[0154] As an example, when the maximum relative displacement is less than the lower limit of the friction noise displacement range, the noise risk probability is set to 0;

[0155] When the maximum relative displacement is in the friction noise displacement range, the noise risk probability X is:

[0156]

[0157] When the maximum relative displacement is greater than the upper limit of the friction noise displacement range, the noise risk probability is 100%;

[0158] Among them, the maximum relative displacement is D, and the friction noise displacement range is [a, b].

[0159] In this example, the risk level of abnormal noise is evaluated through probability calculation, and the calculation method is shown in the following table. When the maximum relative displacement D of the target friction position is output in the abnormal noise simulation analysis model, when D < a, there is no abnormal noise risk, and the probability of abnormal noise risk is 0; when D > b, the probability of abnormal noise risk is 100%, and it is necessary to reduce the risk of abnormal noise through structural optimization such as installation and limit; when a < D < b, it is necessary to output the relative movement speed at the maximum friction displacement from the CAE model, and judge the abnormal noise risk by comparing the working conditions close to the test. The probability of abnormal noise risk at this time is

[0160] Furthermore, when a<D<b, the risk probability of abnormal noise has been determined. If it is necessary to determine more accurately whether abnormal noise will occur, the working condition corresponding to the maximum relative displacement D in the abnormal noise simulation analysis model is compared with the minimum friction abnormal noise displacement measured under the closest working condition in the test equipment test. The risk is finally determined to exist when the maximum relative displacement D is greater than the minimum friction abnormal noise displacement measured under the corresponding working condition.

[0161] In this embodiment, a specific judgment is made on the abnormal noise caused by friction of the interior parts. When a<D<b, the relative motion speed at the maximum friction displacement needs to be output from the CAE model, and the abnormal noise risk is judged by comparing the working conditions close to the test. The probability of the abnormal noise risk at this time is That is, to determine the probability of abnormal noise risk in interior parts.

[0162] Take the data in the simple example listed in step S402 as an example to illustrate:

[0163] The displacement range of friction noise is [0.6, 1.6] mm. When the maximum relative displacement is less than 0.6 mm, no noise will occur; when the maximum relative displacement is greater than 1.6 mm, noise will definitely occur; when the maximum relative displacement is greater than 0.6 mm and less than 1.6 mm, there is a risk of noise, and further analysis is needed to determine whether noise actually occurs.

[0164] In this embodiment, when a<D<b, only the risk probability of abnormal noise can be obtained, but it cannot be determined whether the abnormal noise actually occurs. For this reason, the working condition corresponding to the maximum relative displacement D at this time in the abnormal noise simulation analysis model is compared with the minimum friction abnormal noise displacement measured under the closest working condition in the test equipment test. When D is greater than the minimum friction abnormal noise displacement measured under the closest working condition, it is determined that the abnormal noise occurs, which provides a definite result for the abnormal noise analysis of the abnormal noise simulation analysis model.

[0165] In one embodiment, if Figure 7As shown, in step S101, i.e., performing a press test on the interior parts of the whole vehicle to determine the target interior parts and the abnormal noise friction position corresponding to the target interior parts, the interior parts abnormal noise simulation analysis method further includes:

[0166] Step S701: Perform damping test analysis on the interior trim of the entire vehicle to obtain the modal damping corresponding to the interior trim of the entire vehicle.

[0167] Step S702: Perform vibration test analysis on the interior trim of the entire vehicle to obtain the dynamic stiffness of fasteners corresponding to the interior trim of the entire vehicle.

[0168] Step S704: constructing an abnormal noise simulation analysis model according to the modal damping corresponding to the vehicle interior parts and the dynamic stiffness of the fasteners.

[0169] As an example, in order to establish a simulation analysis model for abnormal noise of interior parts, the abnormal noise of automobile interior parts is analyzed and tested, including but not limited to the following target abnormal noise analysis parameters:

[0170] Minimum friction displacement; the friction properties of a material are directly related to the possibility of it producing abnormal noise. When there are uneven, rough or mismatched parts on the surface of the material, the sound caused by friction will cause abnormal noise. The minimum friction displacement refers to the relatively small displacement between materials when friction occurs.

[0171] Modal damping; Modal damping refers to the degree of energy dissipation of a material or structure during vibration. Lower modal damping will cause vibration to last longer, thereby increasing the possibility of abnormal noise. Some interior parts may lack sufficient modal damping due to design problems or improper material selection.

[0172] Dynamic stiffness of fasteners; The dynamic stiffness of fasteners (such as bolts and screws) refers to their stiffness characteristics when subjected to force and movement. Fasteners with low dynamic stiffness are prone to loosening under the action of vibration, causing noise or abnormal noise between interior parts or between interior parts and the car body.

[0173] As an example, automobile interior parts are tested and analyzed from multiple angles to obtain a series of parameters related to abnormal noise caused by pressing the interior parts, which are input into the abnormal noise simulation analysis model to make the abnormal noise simulation analysis model more precise and accurate.

[0174] In addition to the parameters obtained from the above-mentioned test analysis angles and incorporated into the interior parts abnormal noise simulation analysis model, the abnormal noise simulation analysis model also includes the application of boundary conditions and the definition of motion. In addition to applying appropriate boundary conditions in the model, such as applying pressure, constraints and supports, it is also necessary to define the relative motion between adjacent components in the abnormal noise simulation analysis model, including the initial position or initial state and the applied external force. The defined motion also includes the direction, frequency and amplitude of the relative motion between the interior parts when the car is vibrating at a certain frequency (simulating road bumps).

[0175] In one embodiment, if Figure 8 As shown, step S701, i.e., performing damping test analysis on the interior trim of the whole vehicle to obtain the modal damping corresponding to the interior trim of the whole vehicle, includes:

[0176] Step S801: applying a sinusoidal wave excitation within a preset frequency range to the interior trim of the entire vehicle, and obtaining a test acceleration corresponding to the sinusoidal wave excitation.

[0177] Step S802: construct a transfer function according to the sinusoidal wave excitation and the test acceleration, and determine the Rayleigh damping coefficient.

[0178] Step S803: Determine the modal damping corresponding to the vehicle interior trim based on the Rayleigh damping coefficient.

[0179] As an example, based on the nonlinear dynamic equation of stick-slip friction and Rayleigh damping, the expression for the damping value is obtained:

[0180]

[0181] Among them, α and β are Rayleigh damping coefficients, i is the resonance point, and f i is the frequency of the resonance point, ξ i，rayi is the Rayleigh damping at the resonance point i.

[0182] Specifically, the nonlinear dynamic equation of stick-slip friction motion is:

[0183]

[0184] Where: M is mass, D is damping, K is stiffness, f e is the incentive force, f nl is the nonlinear force (friction), x is the displacement, and t is the time.

[0185] According to Rayleigh damping:

[0186] D n =αM n +βK n ······(1);

[0187] Where α and β are two proportional coefficients, D n is the damping, M n and K n is the mass matrix and the stiffness matrix. D n is a damping matrix. Assuming that in the simplest model, a mass block exerts a force on the spring, it can be calculated according to M 1 , K 1 Get damping D 1 But in a complex system, there are many masses and elastic coefficients, which will form a damping matrix.

[0188] According to the damping ratio-mass-angular frequency formula and the angular frequency formula of simple harmonic vibration, D n =2ξ n ω n M n and Substitute it and get:

[0189]

[0190] ω n =2πf n ;

[0191]

[0192] ξ i，rayi is the Rayleigh damping at the resonance point i, and a superimposed damping value can be calculated, and ω is the natural angular frequency of the system.

[0193] The -3db bandwidth method is used to obtain the values ​​of the Rayleigh damping coefficients α and β.

[0194] The -3db bandwidth method is to use the bandwidth corresponding to the -3dB bandwidth amplitude equal to twice the square root of the maximum value, and calculate the damping ratio of the bandwidth:

[0195]

[0196] Damping ratio ξ i,ray It can be calculated based on the frequency f of the left point of the resonance point (waveform peak) -3dB bandwidth il and point f on the right ir and the resonance frequency f i By calculating and measuring multiple different frequencies and different transfer functions, multiple damping ratios ξ can be calculated. i,ray The damping ratio ξ i,ray Substituting the value into formula (2) as Rayleigh damping, the values ​​of α and β can be calculated.

[0197] Substituting the values ​​of α and β obtained above into formula (2), the accurate damping value can be calculated as the input of modal damping in the noise simulation analysis model.

[0198] Specifically, the above method adopts the -3db bandwidth method to obtain the values ​​of Rayleigh damping coefficients α and β, which specifically includes the following contents:

[0199] Construct the transfer function: Among them, X(ω) vibration input is sinusoidal excitation, unit is N, Y(ω) output is acceleration, unit is m / s 2 ;

[0200] Input a sine wave excitation with a certain amplitude and varying within a certain frequency range, measure the output acceleration as the result, and construct an Hf curve about the measurement result, where f is the frequency and H is the output acceleration;

[0201] The values ​​of Rayleigh damping coefficients α and β are calculated according to the following formula:

[0202]

[0203] Among them, f i,l and f i,r They are the frequencies on the left and right of the -3dB bandwidth for the peak drop in frequency at resonance point i.

[0204] As an example, Figure 5 As shown, the transfer function The X(ω) vibration input is a sine wave excitation in N; the Y(ω) output is acceleration in m / s2. In order to measure the transfer function H, the input excitation is a sine wave with a frequency of 5 Hz to 145 Hz and an amplitude of 50 N. The force sensor signal is used as input and the measured acceleration is used as output. The peak value of the Hf curve is selected as the vibration shape structure, according to ξ i,-3db , f i The least squares method is used to fit and obtain α and β, and thus the damping ratio ξ i,ray .

[0205] The following table gives the Fig.13 As shown in the figure, the relevant parameters are measured using the -3db bandwidth method when the sine wave frequency input excitation is from 5Hz to 145Hz, as an example:

[0206]

[0207] f i and i,ray Input into the abnormal sound simulation analysis model and define the modal damping card.

[0208] In this embodiment, the pressing abnormal sound test is first performed in a semi-anechoic room or an anechoic room, and parts, such as door trim assemblies, are fixed by a tooling stand. Excitation is input to the surface of the tested interior parts to evaluate the abnormal sound level. At the same time, a pressure sensor is attached to the surface of the part to feedback the excitation force as input, and an acceleration sensor is attached to the surface of the part as output to establish a transfer function. The damping ratio is obtained by the above method and used as an important parameter for abnormal sound simulation analysis.

[0209] In one embodiment, if Fig. 9 As shown, step S702, i.e., performing vibration test analysis on the interior parts of the whole vehicle to obtain the dynamic stiffness of the fasteners corresponding to the interior parts of the whole vehicle, includes:

[0210] Step S901: applying a sinusoidal wave excitation within a preset frequency range to the interior trim of the entire vehicle to obtain third vibration data at a fastener installation position of the interior trim of the entire vehicle.

[0211] Step S902: Analyze the third vibration data to determine the dynamic stiffness of the fastener corresponding to the interior trim of the entire vehicle.

[0212] The third vibration data includes but is not limited to displacement or deformation data corresponding to a preset frequency range recorded by a displacement sensor.

[0213] As an example, the dynamic stiffness test of the fasteners of the interior parts is carried out by a test device, and the specific process includes but is not limited to the following steps:

[0214] Select appropriate testing equipment and tools, such as force sensors, displacement sensors, and fixtures, to ensure the accuracy and reliability of the equipment;

[0215] A fixture is provided to simulate actual installation conditions to ensure that the interior trim parts and related fasteners are in a stable position. The fixture should be able to hold the interior trim parts to be tested and their attached fasteners.

[0216] Connect the force sensor to the fixture, apply different loading forces or torques to the fastener, and record the corresponding displacement or deformation data through the displacement sensor.

[0217] The dynamic stiffness parameters are calculated based on the collected force and displacement data. Generally, the dynamic stiffness can be obtained by applying a series of known forces or torques or vibrations and measuring the corresponding displacements or deformation values. The dynamic stiffness can be expressed as the proportional relationship between the force and displacement of the fastener.

[0218] The obtained fastener dynamic stiffness parameters are introduced into the simulation analysis model of the interior parts abnormal noise by adding corresponding constraints in the model or modifying the element properties.

[0219] In the simulation analysis method for abnormal noise of interior decoration parts provided in this embodiment, the parameters usually involved in the dynamic stiffness of fasteners include but are not limited to:

[0220] Stiffness: It indicates the material's resistance to elastic deformation caused by force, which can be linear stiffness or nonlinear stiffness;

[0221] Preload: Used to describe the preload or pretorque applied to the joint during fastener installation.

[0222] In one embodiment, if Figure 7 As shown, in step S101, i.e., performing a press test on the interior parts of the whole vehicle to determine the target interior parts and the abnormal noise friction position corresponding to the target interior parts, the interior parts abnormal noise simulation analysis method further includes:

[0223] Step S703: Perform a compression test analysis on the interior trim of the entire vehicle to obtain the compression force and compression area data corresponding to the interior trim of the entire vehicle.

[0224] As an example, in step S703, in order to establish a simulation analysis model for abnormal noise of interior parts, in addition to modal damping and fastener dynamic stiffness, the abnormal noise of automobile interior parts should also be analyzed and tested from the following aspects:

[0225] Pressing pressure and pressing area data: When passengers operate or touch interior parts, the pressing pressure and pressing area will affect the generation of abnormal noise. Higher pressing pressure and smaller pressing area may increase the contact, collision and friction between interior parts, thereby causing abnormal noise. Pressing pressure and pressing area data include the corresponding pressing pressure, pressing area, and abnormal noise for any pressing test at any pressing position. Pressing pressure and pressing area data reflect the performance of interior parts sound when the working condition parameters are based on pressing pressure and pressing area data, and are input into the abnormal noise simulation analysis model.

[0226] In one embodiment, a device for simulating and analyzing abnormal noise of interior decoration parts is provided, and the device corresponds to the simulation and analysis method in the above embodiment one by one, such as Fig.10 As shown, the interior trim abnormal noise simulation analysis device includes a maximum relative displacement module 1001, a friction abnormal noise displacement interval module 1002 and an abnormal noise risk probability module 1003. The detailed description of each functional module is as follows:

[0227] The maximum relative displacement module 1001 is used to perform simulation analysis on the target friction position corresponding to the target interior part by using the abnormal noise simulation analysis model to determine the maximum relative displacement corresponding to the target friction position;

[0228] The friction noise displacement interval module 1002 is used to perform a friction test on a target friction position corresponding to the target interior part to determine the friction noise displacement interval corresponding to the target friction position;

[0229] The abnormal noise risk probability module 1003 is used to determine the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

[0230] In one embodiment, the interior trim abnormal noise simulation and analysis device further comprises a target friction position module, which is used to perform a press test on the interior trim of the entire vehicle to determine a target interior trim and a target friction position corresponding to the target interior trim;

[0231] In one embodiment, the target friction position module includes a module for obtaining pressing test data, a module for obtaining pressing abnormal sound score, a module for determining a target interior part, and a module for determining a target friction position, wherein:

[0232] A module for obtaining press test data is used to perform a press test on at least one vehicle interior component and obtain press test data corresponding to each of the vehicle interior components;

[0233] A module for obtaining a pressing abnormal sound score is used to analyze the pressing test data corresponding to each of the vehicle interior parts to obtain a pressing abnormal sound score corresponding to each of the vehicle interior parts;

[0234] A target interior component determination module is used to determine the vehicle interior component with the pressing abnormal sound score less than a first score threshold as a target interior component;

[0235] The module for determining a target friction position is used to analyze the contact gap between the target interior component and an adjacent interior component to determine a target friction position corresponding to the target interior component.

[0236] In one embodiment, the maximum relative displacement module 1001 includes a vibration data acquisition module and a maximum relative displacement determination module, wherein:

[0237] A vibration data acquisition module is used to perform simulation analysis on a target friction position corresponding to the target interior part using an abnormal noise simulation analysis model to acquire first vibration data corresponding to the target interior part and second vibration data corresponding to an adjacent interior part;

[0238] The maximum relative displacement determination module is used to determine the maximum relative displacement corresponding to the target friction position according to the first vibration data corresponding to the target interior decoration part and the second vibration data corresponding to the adjacent interior decoration part.

[0239] In one embodiment, the friction noise displacement interval module 1002 includes a minimum friction noise displacement acquisition module and a friction noise displacement interval determination module, wherein:

[0240] A minimum friction noise displacement acquisition module is used to perform a friction test on a target friction position corresponding to the target interior part based on at least two friction test conditions, and respectively acquire the minimum friction noise displacement corresponding to each friction test condition;

[0241] The module for determining the friction abnormal noise displacement interval is used to determine the friction abnormal noise displacement interval corresponding to the target friction position according to the minimum friction abnormal noise displacement corresponding to at least two friction test conditions.

[0242] In one embodiment, the module for obtaining the minimum friction abnormal noise displacement includes a module for obtaining friction test data, a module for determining the stick-slip pulse frequency, and a module for calculating the minimum friction abnormal noise displacement, wherein:

[0243] A friction test data acquisition module, configured to perform a friction test on a target friction position corresponding to the target interior component based on at least two friction test conditions, and to acquire friction test data corresponding to each of the friction test conditions;

[0244] A stick-slip pulse frequency determination module is used to analyze the friction test data corresponding to each of the friction test conditions to determine the stick-slip pulse frequency corresponding to each of the friction test conditions;

[0245] The minimum friction abnormal noise displacement calculation module is used to obtain the minimum friction abnormal noise displacement corresponding to each friction test condition according to the stick-slip pulse frequency corresponding to each friction test condition.

[0246] In one embodiment, the abnormal sound risk probability module 1003 includes a first risk probability determination module, a second risk probability determination module, and an abnormal sound risk probability calculation module, wherein:

[0247] A first risk probability determination module is used to determine the abnormal noise risk probability as the first risk probability if the maximum relative displacement is less than the lower limit of the friction abnormal noise displacement interval;

[0248] A second risk probability determination module is used to determine the abnormal noise risk probability as a second risk probability if the maximum relative displacement is greater than an upper limit value of the friction abnormal noise displacement interval;

[0249] The abnormal noise risk probability calculation module is used to calculate the abnormal noise risk probability according to the maximum relative displacement, the lower limit value and the upper limit value of the friction abnormal noise displacement interval if the maximum relative displacement is in the friction abnormal noise displacement interval.

[0250] In one embodiment, the interior decoration part abnormal noise simulation analysis device further includes a modal damping module, a fastener dynamic stiffness module, a pressing force and pressing area module, and a module for constructing an abnormal noise simulation analysis model, wherein:

[0251] Modal damping module, used to perform damping test analysis on the interior parts of the whole vehicle and obtain the modal damping corresponding to the interior parts of the whole vehicle;

[0252] The fastener dynamic stiffness module is used to perform vibration test analysis on the interior parts of the whole vehicle and obtain the fastener dynamic stiffness corresponding to the interior parts of the whole vehicle;

[0253] The pressing force and pressing area module is used to perform a pressing test on the interior parts of the whole vehicle and obtain the pressing force and pressing area data corresponding to the interior parts of the whole vehicle;

[0254] A noise simulation analysis model module is constructed to construct an noise simulation analysis model according to the modal damping, fastener dynamic stiffness, pressing force and pressing area data corresponding to the vehicle interior parts.

[0255] In one embodiment, the modal damping module includes a test acceleration acquisition module, a Rayleigh damping coefficient determination module and a modal damping determination module, wherein:

[0256] A test acceleration acquisition module is used to apply a sinusoidal wave excitation within a preset frequency range to the interior parts of the vehicle, and acquire a test acceleration corresponding to the sinusoidal wave excitation;

[0257] A Rayleigh damping coefficient determination module is used to construct a transfer function according to the sinusoidal wave excitation and the test acceleration to determine the Rayleigh damping coefficient;

[0258] The modal damping determination module is used to determine the modal damping corresponding to the interior trim of the entire vehicle based on the Rayleigh damping coefficient.

[0259] In one embodiment, the fastener dynamic stiffness module includes a third vibration data acquisition module and a fastener dynamic stiffness determination module, wherein:

[0260] The third vibration data acquisition module is used to apply a sinusoidal wave excitation within a preset frequency range to the interior decoration parts of the whole vehicle, and acquire the third vibration data at the fastener installation position of the interior decoration parts of the whole vehicle.

[0261] The module for determining the dynamic stiffness of fasteners is used to analyze the third vibration data and determine the dynamic stiffness of fasteners corresponding to the interior trim of the whole vehicle.

[0262] For the specific definition of the simulation analysis device, please refer to the definition of the simulation analysis method above, which will not be repeated here. Each module in the above-mentioned simulation analysis device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0263] The present invention also provides a testing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the above-mentioned simulation analysis method is implemented when the processor executes the computer program.

[0264] In one embodiment, a test device is provided. The test device may be a server, and its internal structure diagram may be as follows: Fig.11 As shown. The test device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the test device is used to provide computing and control capabilities. The memory of the test device includes a computer storage medium and an internal memory. The computer storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the computer storage medium. The database of the test device is used to store data generated or obtained during the execution of the simulation analysis method. The network interface of the test device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a simulation analysis method is implemented.

[0265] In one embodiment, a test device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the simulation analysis method in the above embodiment are implemented, for example Figure 1 Steps S101-S103 shown, or Figures 2 to 9 Alternatively, when the processor executes the computer program, the functions of each module / unit in this embodiment of the simulation analysis device are realized, for example Fig.10 The functions of the modules / units shown are not described here in detail to avoid repetition.

[0266] In one embodiment, a test system is provided. The test system includes the above-mentioned test device and a test bench for applying simulated working conditions to the tested interior trim component when the test device is working.

[0267] In this example, applying simulated working conditions to the tested interior parts includes applying at least two different working conditions to the tested interior parts, and the different working conditions include but are not limited to: one or more parameters of temperature, humidity, pressure, relative friction speed, vibration frequency, and vibration amplitude are different.

[0268] In one embodiment, a test system is provided, the test system comprising the test device as described above and a test bench for applying a simulated working condition to the tested interior trim component when the test device is working, such as Fig.12As shown, the test stand includes a vibration table 1, an excitation end 6, a tooling beam 5 and a tooling connecting plate 7. The tested interior decoration part is installed on the tooling beam 5 through the tooling connecting plate 7. The surface of the tested interior decoration part is attached with an acceleration sensor 2. The excitation end 6 is detachably installed on the vibration table 1. The end of the excitation end 6 is in contact and connected with the surface of the tested interior decoration part. A plurality of mounting positions are arranged on the tooling beam 5. One end of the tooling connecting plate 7 is detachably connected to one or more mounting positions. The other end of the tooling connecting plate 7 is detachably connected to the mounting hole of the tested interior decoration part. The excitation end 6 includes a plurality of loading heads with different shapes and materials. The vibration table 1 emits harmonic vibration and transmits it to the excitation end 6.

[0269] In this embodiment, a plurality of installation positions are provided on the tooling crossbeam 5 , and the interior decoration component to be tested is installed on the tooling crossbeam 5 in cooperation with the tooling connecting plate 7 to simulate the actual installation conditions of the interior decoration component to be tested.

[0270] As an example, the tooling crossbeam 5 includes a crossbeam and a vertical beam, and multiple installation positions are set on the crossbeam and the vertical beam. In addition to installing the tooling connecting plate 7, the installation position of the vertical beam can also install the crossbeam; the crossbeam and the vertical beam are connected by a stand fixing angle seat 3 and a fixing bolt 4.

[0271] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0272] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual projects, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0273] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A simulation analysis method for abnormal noise of interior decoration parts, characterized in that: include: The abnormal noise simulation analysis model is used to perform simulation analysis on the target friction position corresponding to the target interior part to determine the maximum relative displacement corresponding to the target friction position; Performing a friction test on a target friction position corresponding to the target interior trim component to determine a friction abnormal noise displacement interval corresponding to the target friction position; The abnormal noise risk probability is determined according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

2. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 1, characterized in that: Before the abnormal noise simulation analysis model is used to simulate and analyze the target friction position corresponding to the target interior decoration part and the maximum relative displacement corresponding to the target friction position is determined, the abnormal noise simulation analysis method for the interior decoration part further includes: A compression test is performed on the interior parts of the entire vehicle to determine a target interior part and a target friction position corresponding to the target interior part.

3. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 2, characterized in that: The pressing test is performed on the interior trim of the whole vehicle to determine the target interior trim and the target friction position corresponding to the target interior trim, including: Performing a compression test on all interior parts of the vehicle to obtain compression test data corresponding to each interior part of the vehicle; Analyze the compression test data corresponding to each of the vehicle interior parts to obtain the compression noise score corresponding to each of the vehicle interior parts; Determine the vehicle interior parts with the pressing abnormal sound score less than the first score threshold as target interior parts; Analyzing the contact gap between the target interior component and an adjacent interior component to determine a target friction position corresponding to the target interior component; Wherein, the adjacent interior decoration part is an interior decoration part adjacent to the target interior decoration part.

4. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 1, characterized in that: The adopting of the abnormal noise simulation analysis model to simulate and analyze the target friction position corresponding to the target interior trim part to determine the maximum relative displacement corresponding to the target friction position includes: Using an abnormal noise simulation analysis model to perform simulation analysis on a target friction position corresponding to the target interior component, and obtaining first vibration data corresponding to the target interior component and second vibration data corresponding to an adjacent interior component; Determining a maximum relative displacement corresponding to the target friction position according to first vibration data corresponding to the target interior component and second vibration data corresponding to an adjacent interior component; Wherein, the adjacent interior decoration part is an interior decoration part adjacent to the target interior decoration part.

5. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 1, characterized in that: The performing of a friction test on a target friction position corresponding to the target interior trim component to determine a friction abnormal noise displacement interval corresponding to the target friction position includes: Based on at least two friction test conditions, a friction test is performed on a target friction position corresponding to the target interior component, and a minimum friction abnormal noise displacement corresponding to each friction test condition is obtained respectively; The friction noise displacement interval corresponding to the target friction position is determined according to the minimum friction noise displacement corresponding to at least two friction test conditions.

6. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 5, characterized in that: The method of performing a friction test on a target friction position corresponding to the target interior component based on at least two friction test conditions, and obtaining a minimum friction noise displacement corresponding to each friction test condition, includes: Based on at least two friction test conditions, performing a friction test on a target friction position corresponding to the target interior component, and respectively obtaining friction test data corresponding to each of the friction test conditions; Analyzing the friction test data corresponding to each of the friction test conditions to determine the stick-slip pulse frequency corresponding to each of the friction test conditions; According to the stick-slip pulse frequency corresponding to each friction test condition, the minimum friction abnormal noise displacement corresponding to each friction test condition is obtained.

7. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 1, characterized in that: Determining the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position includes: If the maximum relative displacement is less than the lower limit of the friction abnormal noise displacement interval, the abnormal noise risk probability is determined to be the first risk probability; If the maximum relative displacement is greater than the upper limit value of the friction abnormal noise displacement interval, the abnormal noise risk probability is determined to be the second risk probability; If the maximum relative displacement is within the friction noise displacement interval, the noise risk probability is calculated based on the maximum relative displacement and the lower limit and upper limit of the friction noise displacement interval.

8. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 2, characterized in that: Before performing a press test on the interior parts of the vehicle to determine the target interior parts and the abnormal noise friction position corresponding to the target interior parts, the abnormal noise simulation analysis method of the interior parts further includes: Conduct damping test analysis on the interior parts of the vehicle to obtain the modal damping corresponding to the interior parts of the vehicle; Conduct vibration test analysis on the interior parts of the vehicle to obtain the dynamic stiffness of the fasteners corresponding to the interior parts of the vehicle; According to the modal damping and fastener dynamic stiffness corresponding to the vehicle interior parts, an abnormal noise simulation analysis model is constructed.

9. The method for simulating and analyzing abnormal noise of interior decoration parts according to claim 8, characterized in that: The damping test analysis of the vehicle interior parts is performed to obtain the modal damping corresponding to the vehicle interior parts, including: Applying a sinusoidal wave excitation within a preset frequency range to the vehicle interior parts to obtain a test acceleration corresponding to the sinusoidal wave excitation; Constructing a transfer function according to the sinusoidal wave excitation and the test acceleration, and determining a Rayleigh damping coefficient; Based on the Rayleigh damping coefficient, the modal damping corresponding to the interior trim of the entire vehicle is determined.

10. A device for simulating and analyzing abnormal noise of interior decoration parts, characterized in that: include: A target friction position module, the target friction position module is used to perform a press test on the interior trim of the entire vehicle to determine a target interior trim and a target friction position corresponding to the target interior trim; A maximum relative displacement module, the maximum relative displacement module is used to perform simulation analysis on a target friction position corresponding to the target interior part using an abnormal noise simulation analysis model to determine a maximum relative displacement corresponding to the target friction position; A friction noise displacement interval module, wherein the friction noise displacement interval module is used to perform a friction test on a target friction position corresponding to the target interior part to determine a friction noise displacement interval corresponding to the target friction position; The abnormal noise risk probability module is used to determine the abnormal noise risk probability according to the maximum relative displacement and the friction abnormal noise displacement interval corresponding to the target friction position.

11. A test device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the simulation analysis method according to any one of claims 1 to 9 is implemented.

12. A testing system, characterized in that: The test system comprises the test device as claimed in claim 11 and a test bench for applying simulated working conditions to the tested interior trim component when the test device is in operation.

13. The test system according to claim 12, characterized in that: The testing stand comprises a vibration table, an excitation end, a tooling beam and a tooling connection plate; The tooling crossbeam is provided with a mounting position, one end of the tooling connection plate is detachably connected to the mounting position, and the other end of the tooling connection plate is detachably connected to the tested interior decoration part, and an acceleration sensor is attached to the surface of the tested interior decoration part; The excitation end is detachably mounted on the vibration table, and the end of the excitation end is in contact with and connected to the surface of the tested interior decoration part; The vibration table emits harmonic vibration and transmits it to the excitation end.

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