Front suspension system noise source positioning method, device and equipment

Abstract

The invention relates to the technical field of vehicle testing, and discloses a front suspension system noise source positioning method, device and equipment, a front suspension system is provided with a plurality of preset positions, and the preset positions are provided with vibration sensors and microphones; the method comprises the following steps: collecting an initial vibration signal at a preset position through a vibration sensor, and collecting an audio signal at the preset position through a microphone; performing frequency comparison according to the audio signal and the initial vibration signal to determine an intermediate vibration signal matched with the audio signal in frequency in the initial vibration signal; screening the intermediate vibration signals according to the inherent attribute of the part where the preset position is located, and determining a target vibration signal meeting a preset noise condition; and performing hyperboloid positioning based on the oscillation starting time of the target vibration signal to obtain the position of the noise source. The method has the beneficial effects that the technical problem that a chassis noise positioning method is tedious is solved, and the technical effects of automatically screening the noise needing to be processed and directly determining the position of the corresponding noise source are achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a method, device and equipment for locating noise sources of a front suspension system. Background Art

[0002] In modern society, as people's vehicle ownership rate gradually increases, cars have become an indispensable means of transportation in modern society. During the use of the car, the chassis of the vehicle may have noise for various reasons, including design errors and parts failures. These noises not only affect the user's driving experience, but the noise caused by parts failure is more likely to affect the performance and safety of the vehicle. In the actual detection process, the specific location of the chassis noise is difficult to judge. At the same time, the cause of the noise requires technicians to make specific judgments based on professional skills and maintenance experience. Therefore, repairs to chassis noise usually take a lot of time, and the repair effect is not ideal. The method of locating the chassis noise source in the related art is highly complex, and it is difficult to directly and quantitatively determine the location of the noise source. Summary of the invention

[0003] The present application provides a method, device and equipment for locating the noise source of a front suspension system, which solves the cumbersome technical problems of chassis noise locating methods, achieves the technical effect of automatically screening the noise to be processed, and directly determining the corresponding noise source position.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, an embodiment of the present application provides a method for locating a noise source of a front suspension system, wherein the front suspension system has a plurality of preset positions, and a vibration sensor and a microphone are disposed at the preset positions; the method comprises:

[0006] The initial vibration signal at the preset position is collected by the vibration sensor, and the audio signal at the preset position is collected by the microphone; wherein the audio signal is the noise transmitted from the noise source through the air to the preset position;

[0007] Performing a frequency comparison between the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is a vibration that is transmitted from the noise source through the parts of the front suspension system to the preset position;

[0008] Screening the intermediate vibration signal according to the inherent properties of the part at the preset position to determine a target vibration signal that meets a preset noise condition;

[0009] Hyperbolic surface positioning is performed based on the vibration start time of the target vibration signal to obtain the position of the noise source.

[0010] The front suspension system noise source positioning method proposed in the embodiment of the present application uses the hyperbolic positioning method to locate the noise source according to the time difference between the target vibration signals at each preset position, thereby achieving high-precision noise source positioning; at the same time, by setting a vibration sensor and a microphone at a preset position, it is possible to directly detect the noise signal propagating in the front suspension system, which is not easily affected by the environment and has a strong anti-interference ability. In addition, the method also screens the intermediate vibration signal corresponding to the noise signal according to the inherent properties of the parts, determines the target vibration signal that needs to be processed, thereby quickly determining the maintenance target and shortening the maintenance cycle.

[0011] Through the hyperbolic positioning method, the noise source is located according to the time difference between the target vibration signals at each preset position, which can achieve high-precision positioning; and by setting the vibration sensor and microphone at the preset position, the noise signal propagated in the front suspension system can be directly detected, which is not easily affected by the environment and has strong anti-interference ability. In addition, this method also screens the intermediate vibration signal corresponding to the noise signal according to the inherent properties of the parts, determines the target vibration signal that needs to be processed, so as to quickly determine the maintenance target and shorten the maintenance time.

[0012] Optionally, performing frequency comparison on the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal includes:

[0013] Frequency deviation calculation is performed on a plurality of vibration peaks in the audio signal and the initial vibration signal, and the initial vibration signal whose frequency deviation is lower than a frequency deviation threshold is used as the intermediate vibration signal.

[0014] Optionally, the inherent properties include mass, stiffness and natural frequency; and screening the intermediate vibration signal according to the inherent properties of the part at the preset position to determine the target vibration signal that meets the preset noise condition includes:

[0015] According to the amplitude and frequency of the intermediate vibration signal, and the mass, stiffness and natural frequency of the part at the preset position, the attention degree of the intermediate vibration signal is evaluated to obtain a vibration attention degree score;

[0016] If the vibration attention score meets the preset noise condition, the intermediate vibration signal corresponding to the vibration attention score is determined as the target vibration signal.

[0017] Optionally, attention is assessed by:

[0018] According to the amplitude of the intermediate vibration signal, and the mass and stiffness of the part at the preset position, a vibration response calculation is performed on the part at the preset position to obtain an amplitude evaluation value;

[0019] According to the frequency of the intermediate vibration signal and the natural frequency of the part at the preset position, a resonance calculation is performed on the part at the preset position to obtain a resonance evaluation amount;

[0020] The intermediate vibration signal is evaluated according to the amplitude evaluation amount and the resonance evaluation amount to obtain the vibration attention score.

[0021] Optionally, evaluating the intermediate vibration signal according to the amplitude evaluation amount and the resonance evaluation amount to obtain the vibration attention score includes:

[0022] Determining the amplitude score of the intermediate vibration signal according to the amplitude evaluation interval in which the amplitude evaluation value is located; wherein the amplitude evaluation interval is staged according to the preset noise condition;

[0023] Determining a resonance score of the intermediate vibration signal according to a resonance evaluation interval in which the resonance evaluation value is located; wherein the resonance evaluation interval is staged according to the preset noise condition;

[0024] The amplitude score and the resonance score are weightedly calculated to obtain the vibration attention score.

[0025] Optionally, performing hyperbolic positioning based on the start time of the target vibration signal to obtain the position of the noise source includes:

[0026] Determine a spatial hyperbolic surface passing through the noise source according to respective starting times of a first target vibration signal and a second target vibration signal; wherein the first target vibration signal and the second target vibration signal are target vibration signals transmitted by the noise source to different preset positions;

[0027] A plurality of spatial hyperbolic surfaces are obtained according to a plurality of groups of first target vibration signals and second target vibration signals, and the position of the noise source is determined based on intersection positions between the plurality of spatial hyperbolic surfaces.

[0028] Optionally, determining the spatial hyperbolic surface passing through the noise source according to the respective onset times of the first target vibration signal and the second target vibration signal includes:

[0029] Determine a distance difference between a first distance and a second distance according to respective starting times of the first target vibration signal and the second target vibration signal; wherein the first distance is the distance between the noise source and a first preset position, and the second distance is the distance between the noise source and a second preset position; the first preset position is a position where the first target vibration signal is collected, and the second preset position is a position where the second target vibration signal is collected;

[0030] A spatial hyperbolic surface with the first preset position and the second preset position as foci is established according to the distance difference.

[0031] Optionally, the form of the space hyperbolic surface is as follows:

[0032]

[0033] in, S is the distance difference, x1, y1 and z1 are the coordinates of the first preset position, and x2, y2 and z2 are the coordinates of the second preset position.

[0034] In a second aspect, an embodiment of the present application provides a noise source positioning device for a front suspension system, wherein the front suspension system has a plurality of preset positions, and a vibration sensor and a microphone are arranged at the preset positions; the device comprises:

[0035] A signal acquisition module, used to acquire an initial vibration signal at the preset position through the vibration sensor, and to acquire an audio signal at the preset position through the microphone; wherein the audio signal is noise transmitted from the noise source through the air to the preset position;

[0036] a vibration determination module, configured to perform a frequency comparison between the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is a vibration that is transmitted from the noise source through the parts of the front suspension system to the preset position;

[0037] A target screening module, used to screen the intermediate vibration signal according to the inherent properties of the part located at the preset position, and determine a target vibration signal that meets the preset noise condition;

[0038] The noise source positioning module is used to perform hyperbolic surface positioning based on the vibration start time of the target vibration signal to obtain the position of the noise source.

[0039] In a third aspect, an embodiment of the present application provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the method described in any one of the above embodiments by executing the computer instructions.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute any one of the methods in the above embodiments.

[0041] In a fifth aspect, an embodiment of the present application provides a computer program product, including computer instructions, and the computer instructions are used to enable a computer to execute any one of the methods in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A step diagram of a method for locating a noise source of a front suspension system provided in an embodiment of the present application;

[0044] Figure 2 A diagram showing the steps of attention evaluation in an embodiment of the present application;

[0045] Figure 3 A diagram showing the steps of positioning the hyperbolic surface in an embodiment of the present application;

[0046] Figure 4 A diagram showing the steps of establishing a spatial hyperbolic surface in an embodiment of the present application;

[0047] Figure 5a This is a signal diagram at the left steering rod during the noise source location verification process in the embodiment of the present application;

[0048] Figure 5b It is a signal diagram at the right steering rod during the noise source positioning verification process in the embodiment of the present application;

[0049] Figure 5c This is a signal diagram on the left steering knuckle during the noise source location verification process in the embodiment of the present application;

[0050] Figure 6 A module diagram of a noise source positioning device for a front suspension system provided in an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the structure of a computer device provided in an embodiment of the present application.

[0052] Among them, the figure numbers of the drawings in the specification are as follows: 100. Signal acquisition module, 200. Vibration determination module, 300. Target screening module, 400. Noise source positioning module. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0054] In modern society, as people's vehicle ownership rate gradually increases, cars have become an indispensable means of transportation in modern society. During the use of the car, the vehicle chassis may have noise for various reasons, including design errors and parts failures. These noises not only affect the user's driving experience, but the noise caused by parts failure is more likely to affect the performance and safety of the vehicle.

[0055] In the actual detection process, the specific location of chassis noise is difficult to determine. The reasons are: 1. When chassis noise is generated by multiple components, different noise sources interfere with each other, making it more difficult to locate the noise source; 2. When the noise signal propagates in the parts, it is affected by reflection and resonance and interferes, making it difficult to determine the vibration signal of the corresponding noise; 3. The propagation path of the noise signal in the parts is complex, and it is difficult and complex to locate the noise source through path analysis. At the same time, the cause of the noise requires technicians to make specific judgments based on professional skills and maintenance experience. Therefore, repairs for chassis noise usually take a lot of time, and the repair effect is not ideal. The methods for locating chassis noise sources in related technologies are highly complex, and it is difficult to directly and quantitatively determine the location of the noise source.

[0056] Based on the above problems, the present application provides a method, device and equipment for locating the noise source of the front suspension system, which is used to locate the noise source in the front suspension system of the automobile chassis. The method collects the initial vibration signal and audio signal related to the noise through vibration sensors and microphones arranged at multiple preset positions in the front suspension system; determines the intermediate vibration signal corresponding to the noise from the initial vibration signal by frequency comparison between the initial vibration signal and the audio signal; screens the intermediate vibration signal according to the inherent properties of the parts at the preset position to determine the target vibration signal to be processed; determines the position of the noise source based on the hyperbolic positioning method according to the starting time of the target vibration signal.

[0057] The method can directly detect the noise signal propagated in the front suspension system by setting a vibration sensor and a microphone at a preset position, reduce the environmental impact, and determine the vibration signal corresponding to the noise from the initial vibration signal by frequency comparison between the initial vibration signal and the audio signal, thereby solving the cumbersome technical problems of the chassis noise positioning method and achieving the technical effect of automatically screening the noise that needs to be processed and directly determining the corresponding noise source position.

[0058] The method for locating the noise source of the front suspension system provided in this specification can be applied to the front suspension system of different vehicle models, and correspondingly, can also be applied to the rear suspension system of the vehicle. It is understandable that after adaptive modification, this method can also be applied to other parts in the vehicle chassis to locate the noise sources of different reasons.

[0059] According to an embodiment of the present application, an embodiment of a method for locating a noise source of a front suspension system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0060] In this embodiment, a method for locating noise sources of a front suspension system is provided, which can be used for the above-mentioned vehicle front suspension system. Figure 1 , Figure 1 A step diagram of a method for locating a noise source of a front suspension system provided in an embodiment of the present application, as shown in the figure, has several preset positions on the front suspension system, and vibration sensors and microphones are arranged at the preset positions; the method comprises:

[0061] S100. Collect an initial vibration signal at a preset position through a vibration sensor, and collect an audio signal at the preset position through a microphone; wherein the audio signal is noise transmitted from a noise source through air to the preset position.

[0062] S200. Perform frequency comparison based on the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is a vibration that is transmitted from a noise source through parts of the front suspension system to a preset position.

[0063] S300. Screen the intermediate vibration signal according to the inherent properties of the parts at the preset position to determine the target vibration signal that meets the preset noise condition.

[0064] S400. Perform hyperbolic positioning based on the vibration start time of the target vibration signal to obtain the position of the noise source.

[0065] Among them, the noise in the front suspension system is an abnormal sound caused by the design problems or failures of the parts. The parts are abnormal after the load is applied due to the above problems, and the position where the noise is generated is the noise source. The noise emitted by the noise source is a vibration signal when it propagates in the parts. In order to collect the vibration signal, it is necessary to set multiple preset positions in the front suspension system. The preset position is a position pre-set on each part of the front suspension system, which is used to detect the vibration signals at different positions of the parts. It should be noted that the preset position can be selected according to the material, shape structure and connection method of the part. The optional positions include but are not limited to: the two end positions, the middle position, the stress concentration area and the key connection point of the part; among them, the vibration signals at the two end positions can reflect the overall vibration of the part, the vibration signals at the middle position can reflect the basic modal characteristics of the part, and the vibration signals at the stress concentration area and the key connection point can reflect the impact of vibration on the life and performance of the part. After determining the noise source, the impact of the noise on the front suspension system can be further analyzed according to the characteristics of the vibration signals in each preset position.

[0066] Furthermore, the inherent properties of the parts can be used to reflect the impact of the vibration signal on the parts. The inherent properties include but are not limited to: the mass of the parts, the elastic modulus and damping ratio of the materials used for the parts, etc. Among them, the mass of the parts directly affects the response of the parts to vibration. The greater the mass, the greater the inertia of the parts, and the slower the response of the parts to vibration, which is manifested as more stable under vibration; the elastic modulus reflects the deformation ability of the parts under vibration. The larger the elastic modulus, the less likely the parts are to be permanently deformed; the damping ratio reflects the attenuation speed of the vibration in the parts. The larger the damping ratio, the more obvious the suppression effect of the parts on the vibration signal, thereby reducing the impact on the parts themselves and the front suspension system. In different embodiments, the inherent properties of the parts can be selected according to actual requirements to quantitatively analyze the impact of the vibration signal on the front suspension system.

[0067] Specifically, multiple preset positions are selected in the front suspension system, and vibration sensors and microphones are set at the preset positions to collect signals emitted by the noise source. Among them, there are at least two preset positions on each part of the front suspension system. When the number of preset positions on a part is two, the preset positions are the two ends of the part. The number and position of the preset positions can also be determined according to the shape of the part. For example, if the shape of the part is to have a certain area on any plane, there are at least three preset positions on the part. It can be understood that the preset positions on the same part may not be on the same straight line, the preset positions can be evenly distributed on the part, and the more preset positions on a part, the more signals collected, and the higher the noise source positioning accuracy. For parts with high importance or parts that are determined to be prone to failure based on experience, multiple preset positions can be determined to improve the noise source positioning accuracy and speed and shorten the positioning time. When calculating, the preset positions on the same part are usually used as the data basis to ensure that the signal propagates at the same speed in the part.

[0068] Furthermore, the signals collected by the vibration sensor and the microphone at the preset position include an initial vibration signal and an audio signal, wherein the audio signal is a signal emitted from the noise source and propagated through the air to the preset position; the initial vibration signal is a signal emitted from the noise source and propagated through the parts of the front suspension system to the preset position. Since the vibration sensor and the microphone are set at the same preset position, the error caused by the position difference to the signal is reduced, ensuring the consistency of the signal. Compared with the initial vibration signal, the audio signal can more clearly reflect the vibration characteristics of the noise and is less affected by the vibration emitted by non-noise sources. Therefore, by comparing the frequency of the audio signal with the initial vibration signal, the signal corresponding to the noise source can be determined from the initial vibration signal.

[0069] In some embodiments, the audio signal collected by the microphone is transmitted through the air, and the air attenuates the high-frequency components of the vibration more significantly, so more high-frequency components in the audio signal are lost. The initial vibration signal collected by the vibration sensor is transmitted through the parts of the front suspension system, and solid materials can transmit high-frequency vibrations more effectively, so more high-frequency components are retained in the initial vibration signal. The audio signal and the initial vibration signal are combined, and the noise characteristics emitted by the noise source are restored through the components contained in the two and their retrograde complementarity, providing a more accurate data basis for the subsequent positioning of the noise source.

[0070] Furthermore, according to the inherent properties of the parts at the preset positions, the intermediate vibration signals are screened based on the preset noise conditions to obtain the target vibration signals. Among them, the noise corresponding to the intermediate vibration signals that meet the preset noise conditions has a greater impact on the user's driving experience and has a negative impact on the performance and safety of the vehicle, and requires targeted maintenance. By screening based on the preset noise conditions, the noise that has a greater impact on the vehicle can be quickly determined, which improves the maintenance efficiency and reduces the risk of noise causes to the vehicle.

[0071] Furthermore, when the noise source is located on a hyperbolic surface according to the start time of the target vibration signal, all preset positions in the front suspension system may collect the signal emitted by the noise source. At this time, the start time of the target vibration signal of all preset positions is arranged in order from early to late, and the front several data are taken to generate a spatial hyperbolic surface. For example, the number of selected ones can be 5. The later the start time, the farther the distance between the corresponding preset position and the noise source, the more obvious the attenuation of the target vibration signal, and the lower the accuracy of noise source location.

[0072] The front suspension system noise source positioning method provided in this embodiment uses the hyperbolic positioning method to locate the noise source according to the time difference between the target vibration signals at each preset position, thereby achieving high-precision noise source positioning; at the same time, by setting a vibration sensor and a microphone at a preset position, it is possible to directly detect the noise signal propagating in the front suspension system, which is not easily affected by the environment and has a strong anti-interference ability. In addition, the method also screens the intermediate vibration signal corresponding to the noise signal according to the inherent properties of the parts, determines the target vibration signal that needs to be processed, thereby quickly determining the maintenance target and shortening the maintenance cycle.

[0073] As an embodiment of the present application, performing frequency comparison on the audio signal and the initial vibration signal to determine an intermediate vibration signal matching the frequency of the audio signal in the initial vibration signal includes:

[0074] S210. Calculate the frequency deviation of multiple vibration peaks in the audio signal and the initial vibration signal, and use the initial vibration signal whose frequency deviation is lower than the frequency deviation threshold as the intermediate vibration signal.

[0075] Specifically, the frequency deviation is in the following form:

[0076] δ ν =H v -H m

[0077] Among them, δ ν Indicates frequency deviation; H v is the frequency of the initial vibration signal; H m is the frequency of the audio signal. According to the frequency deviation δν The magnitude relationship between δ and the frequency deviation threshold is used to determine the initial vibration signal that matches the frequency of the audio signal as the intermediate vibration signal. For example, the frequency deviation threshold of each stage is taken. If δ ν ∈[0,±2Hz], indicating that the frequencies of the initial vibration signal and the audio signal are very close, and the initial vibration signal can be used as the intermediate vibration signal; if δ ν ∈[0,±4Hz] and Indicates that the frequencies of the initial vibration signal and the audio signal are close, which may occur when the preset position is far away from the noise source. It is necessary to determine whether to use the initial vibration signal as the intermediate vibration signal based on the actual situation. If the frequency deviation δ ν Outside the above range, it means that the frequency deviation between the initial vibration signal and the audio signal is large, and there is no corresponding relationship between the two.

[0078] As an embodiment of the present application, the inherent properties include mass, stiffness and natural frequency; the intermediate vibration signal is screened according to the inherent properties of the part at the preset position to determine the target vibration signal that meets the preset noise condition, including:

[0079] S310. Based on the amplitude and frequency of the intermediate vibration signal, as well as the mass, stiffness and natural frequency of the part at the preset position, the intermediate vibration signal is evaluated for attention and a vibration attention score is obtained.

[0080] S320. If the vibration attention score meets the preset noise condition, determine the intermediate vibration signal corresponding to the vibration attention score as the target vibration signal.

[0081] Specifically, the intermediate vibration signal propagating from the noise source to the preset position will cause vibration of the part at the preset position, and the impact of the vibration on the part can be calculated based on the amplitude and frequency of the intermediate vibration signal, as well as the mass, stiffness and natural frequency of the part, so as to obtain a vibration attention score through attention evaluation. The vibration attention score is compared with the preset noise condition. If the vibration attention score meets the preset noise condition, it means that the intermediate vibration signal has a greater impact on the part at the preset position and requires special attention.

[0082] It can be understood that the preset noise conditions can be set according to actual needs. For example, the preset noise conditions may include: part fatigue conditions, part damage conditions, part temperature conditions and part strain conditions; wherein, the part fatigue condition means that the number of times the part vibrates according to the propagated vibration signal should exceed the designed maximum number of times; the part damage condition means that the part is damaged when it vibrates according to the propagated vibration signal; the part temperature condition means that the temperature of the part rises when it vibrates according to the propagated vibration signal, and exceeds the upper temperature limit that the part can withstand; the part strain condition means that when the part vibrates according to the propagated vibration signal, the stress change in the part exceeds the design upper limit of the part.

[0083] Reference Figure 2 , Figure 2 This is a step diagram of attention evaluation in an embodiment of the present application. As shown in the figure, as an embodiment of the present application, attention evaluation is performed by the following method:

[0084] S312. Based on the amplitude of the intermediate vibration signal, and the mass and stiffness of the part at the preset position, the vibration response of the part at the preset position is calculated to obtain an amplitude evaluation value.

[0085] S314. According to the frequency of the intermediate vibration signal and the natural frequency of the part at the preset position, a resonance calculation is performed on the part at the preset position to obtain a resonance evaluation value.

[0086] S316. Evaluate the intermediate vibration signal according to the amplitude evaluation amount and the resonance evaluation amount to obtain a vibration attention score.

[0087] Specifically, the amplitude evaluation quantity is in the following form:

[0088]

[0089] Wherein, F represents the amplitude evaluation value; T is the amplitude of the intermediate vibration signal; M is the mass of the part at the preset position; and K is the stiffness of the part at the preset position. The amplitude evaluation value characterizes the amplitude of the vibration generated by the part at the preset position due to the intermediate vibration signal after the part at the preset position is subjected to the intermediate vibration signal. It can be understood that the larger the amplitude evaluation value, the greater the amplitude of the vibration of the part at the preset position with the intermediate vibration signal, and the vibration of the part may cause damage to the part itself; in addition, due to the vibration, the part may collide with other parts, causing damage to multiple parts.

[0090] Furthermore, the resonance evaluation quantity is in the form of:

[0091] δ r =H v -H p

[0092] Among them, δ r Represents the resonance evaluation quantity; H p is the natural frequency of the part at the preset position. The resonance evaluation quantity characterizes the possibility of the part at the preset position resonating due to the intermediate vibration signal after being subjected to the intermediate vibration signal. It can be understood that the higher the resonance evaluation quantity, the more likely the part at the preset position is to resonate with the intermediate vibration signal, which increases the vibration amplitude of the part, resulting in damage to the part and other parts connected to the part.

[0093] As an embodiment of the present application, the intermediate vibration signal is evaluated according to the amplitude evaluation amount and the resonance evaluation amount to obtain a vibration attention score, including:

[0094] S317. Determine the amplitude score of the intermediate vibration signal according to the amplitude evaluation interval in which the amplitude evaluation value is located; wherein the amplitude evaluation interval is set in stages according to preset noise conditions.

[0095] S318. Determine the resonance score of the intermediate vibration signal according to the resonance evaluation interval in which the resonance evaluation value is located; wherein the resonance evaluation interval is staged according to preset noise conditions.

[0096] S319. Perform weighted calculation on the amplitude score and the resonance score to obtain a vibration attention score.

[0097] Specifically, for the amplitude evaluation value, the amplitude evaluation interval is divided into 3 intervals, among which, the first amplitude evaluation interval is: if the amplitude evaluation value 1≤F<3, it means that for the part at the preset position, the intermediate vibration signal may cause abnormal vibration; the second amplitude evaluation interval is: if the amplitude evaluation value 3≤F<5, it means that the intermediate vibration signal causes abnormal vibration to the part at the preset position; the third amplitude evaluation interval is: if the amplitude evaluation value F≥5, it means that the intermediate vibration signal causes serious abnormal vibration to the part at the preset position, and special attention is required. It can be understood that the amplitude score of the first amplitude evaluation interval is the lowest, the amplitude score of the second amplitude evaluation interval is higher than the first amplitude evaluation interval, and the amplitude score of the third amplitude evaluation interval is the highest.

[0098] Furthermore, for the resonance evaluation value, the resonance evaluation interval is divided into three intervals, wherein the first resonance evaluation interval is: if the resonance evaluation value δ r ∈[-2Hz,2Hz], indicating that the part at the preset position may resonate with the intermediate vibration signal; the second resonance evaluation interval is: if the resonance evaluation value δ r ∈[-5Hz,5Hz] and Indicates that the part at the preset position resonates with the intermediate vibration signal; the third resonance evaluation interval is: if the resonance evaluation value δ r∈[-10Hz,10Hz] and It means that the part at the preset position resonates with the intermediate vibration signal, and the resonance amplitude is large, and special attention needs to be paid. It can be understood that the resonance score of the first resonance evaluation interval is the lowest, the resonance score of the second resonance evaluation interval is higher than the first resonance evaluation interval, and the resonance score of the third resonance evaluation interval is the highest.

[0099] Furthermore, the weight coefficients of the amplitude score and the resonance score can be determined according to the focus direction in actual needs, and the vibration attention score is obtained by weighted calculation of the amplitude score and the resonance score. It can be understood that the higher the vibration attention score, the greater the impact of the intermediate vibration signal on the part at the preset position, and thus the higher the attention.

[0100] Reference Figure 3 , Figure 3 The figure is a step diagram of hyperbolic surface positioning in an embodiment of the present application. As shown in the figure, as an embodiment of the present application, hyperbolic surface positioning is performed based on the starting time of the target vibration signal to obtain the position of the noise source, including:

[0101] S410. Determine a spatial hyperbolic surface passing through the noise source according to the respective starting times of the first target vibration signal and the second target vibration signal; wherein the first target vibration signal and the second target vibration signal are target vibration signals transmitted by the noise source to different preset positions.

[0102] S420. Obtain a plurality of spatial hyperbolic surfaces according to a plurality of groups of first target vibration signals and second target vibration signals, and determine the position of the noise source based on the intersection positions between the plurality of spatial hyperbolic surfaces.

[0103] Specifically, it can be known from the geometric characteristics of the hyperbolic surface that the distance difference between any point on the hyperbolic surface and the corresponding two foci is a constant. Accordingly, the distances between the noise source and different preset positions are different, and according to the determined preset positions, the difference between the distances is determined, so the possible position of the noise source can be represented by the hyperbolic surface, thereby locating the noise source.

[0104] Furthermore, a plurality of spatial hyperboloids are obtained according to the determined plurality of target vibration signals. For target vibration signals emitted by the same noise source, the spatial hyperboloids should intersect at the same point, i.e., the position of the noise source. Therefore, the noise source can be located according to the focus of the spatial hyperboloid. It can be understood that the greater the number of spatial hyperboloids, the higher the accuracy of noise source location.

[0105] Reference Figure 4 , Figure 4The step diagram for establishing a spatial hyperbolic surface in an embodiment of the present application is shown in the figure. As an embodiment of the present application, according to the respective starting times of the first target vibration signal and the second target vibration signal, determining the spatial hyperbolic surface passing through the noise source includes:

[0106] S412. Determine the distance difference between the first distance and the second distance based on the respective onset times of the first target vibration signal and the second target vibration signal; wherein the first distance is the distance between the noise source and the first preset position, and the second distance is the distance between the noise source and the second preset position; the first preset position is the position for collecting the first target vibration signal, and the second preset position is the position for collecting the second target vibration signal.

[0107] S414. According to the distance difference, establish a spatial hyperbolic surface with the first preset position and the second preset position as foci.

[0108] Specifically, during the noise source location process, there is a time difference when the signal emitted by the noise source propagates to different preset locations, that is, different preset locations have different starting times. The distance difference is in the form of:

[0109] S=V·|T1-T2|

[0110] Wherein, S represents the distance difference; V is the propagation speed of the target vibration signal; T1 is the start time of the first preset position; T2 is the start time of the second preset position. In actual situations, the propagation speed of the target vibration signal is related to the material of the parts in the propagation path, and the actual propagation speed can be modified according to the results of the noise source positioning. For example, if according to the noise source positioning results, there are two or more materials of the parts in the propagation path of the target vibration signal, then it is necessary to calculate the propagation speed of the target vibration signal in segments according to the size of the parts. It should be noted that the above calculation method can improve the accuracy of positioning, but it will also increase the complexity of the method; in order to avoid the influence, when setting the vibration sensor and the microphone, multiple preset positions can be selected on a part, so that there is only one material of the parts in the propagation path of the target vibration signal, thereby reducing the influence of the material on the positioning accuracy.

[0111] Further, the front suspension system to be analyzed is placed in a global coordinate system. For example, the xy plane of the global coordinate system is parallel to the horizontal plane, and the z axis is perpendicular to the horizontal plane. When establishing a spatial hyperbolic surface, a local coordinate system is established with the midpoint of the first preset position and the second preset position as the origin, a straight line passing through the first preset position and the second preset position as the y axis direction, a direction perpendicular to the y axis and parallel to the horizontal plane as the x axis, and a direction perpendicular to the x axis and the y axis as the z axis, and a spatial hyperbolic surface is established in the local coordinate system. It can be understood that since the first preset position and the second preset position are known, the coordinate system conversion relationship between the local coordinate system and the global coordinate system is known. After the coordinates of the noise source in the global coordinate system are converted, the coordinates of the noise source obtained in the local coordinate system should satisfy the equation of the spatial hyperbolic surface.

[0112] As an embodiment of the present application, the form of the space hyperbolic surface is as follows:

[0113]

[0114] in, S is the distance difference, x1, y1 and z1 are the coordinates of the first preset position, and x2, y2 and z2 are the coordinates of the second preset position.

[0115] Specifically, since the first preset position and the second preset position are known, the noise source must be on a hyperboloid with the first preset position and the second preset position as foci and a major axis of S / 2. Several groups of spatial hyperboloids are established according to the form of the above-mentioned spatial hyperboloids, and the intersection of the spatial hyperboloids is determined by a three-dimensional model drawing method, thereby determining the specific position of the noise source.

[0116] In some embodiments, after the noise source position is determined according to the above steps, the obtained results are verified, and the verification method includes gradually detecting vibrations at multiple positions in the front suspension system, and gradually determining the noise position and cause according to the detection results. Exemplarily, the noise source is determined to be at the contact position between the left steering knuckle and the right steering knuckle and the wheel hub bearing respectively through the front suspension system noise source positioning method provided by the present application.

[0117] During the verification process, vibration is first detected on each part of the front suspension system, including: left reducer plane bearing, left reducer lower spring plate, left stabilizer bar tie rod, left steering knuckle, left lower swing arm, stabilizer bar, left half-shaft inner ball cage, left half-shaft outer ball cage, left rack and left steering rod and corresponding parts on the right side of the front suspension system; the instrument used to detect vibration can be the same vibration sensor as in the front suspension system noise source locating method provided in this application, or it can be a handheld vibrometer, etc.

[0118] Reference Figure 5a and Figure 5b , Figure 5aThis is a signal diagram of the left steering rod during the noise source location verification process in the embodiment of the present application. Figure 5b This is a signal diagram of the right steering rod during the noise source location verification process in the embodiment of the present application. Figure 5a and Figure 5b The upper middle figure is the detected signal, and the lower figure is an enlarged schematic diagram of the target vibration signal. The horizontal axes of the upper and lower figures represent time, and the vertical axes represent amplitude. Figure 5a and Figure 5b The data in the figure include vibration signals in three directions collected when the steering wheel is turned left and right in place. The signals in the range of 15s to 36s are when the steering wheel is turned left in place, and the signals in the range of 58s to 76s are when the steering wheel is turned right in place. By amplifying the signals in the corresponding time period, it can be seen that the signal amplitude corresponding to the left steering rod is the highest when the steering wheel is turned left in place, and the signal amplitude corresponding to the right steering rod is the highest when the steering wheel is turned right in place. The signal amplitude on the left steering rod is higher between the two signals, so the noise source is close to the left steering rod.

[0119] Secondly, based on the above results, more detection points were determined in the steering system. Three detection points were selected on the left and right steering rods respectively, and detection points on the left and right steering rods were added. After signal measurement, it was found that when the steering wheel was turned left in situ, the signal amplitude corresponding to the left steering rod ball pin-steering knuckle was the highest, and the signal amplitude corresponding to the right steering rod ball pin-steering knuckle was also high; when the steering wheel was turned right in situ, the signal amplitude corresponding to the right steering rod ball pin-steering knuckle was the highest, and the signal amplitude corresponding to the left steering rod ball pin-steering knuckle was also high; therefore, the noise source was closer to the ball pins on both sides. After checking the ball pin, it was found that the ball pin had a torque attenuation problem. After tightening the ball pin again, it was found that the noise was not eliminated.

[0120] Furthermore, based on the above results, more detection points are determined on the steering knuckles on both sides, among which 3 detection points are selected on the left steering knuckle, and the detection point on the lower mounting point of the left shock absorber is added. Figure 5c , Figure 5c This is a signal diagram on the left steering knuckle during the noise source location verification process in the embodiment of the present application. Figure 5c The upper middle figure is the detected signal, and the lower figure is an enlarged schematic diagram of the target vibration signal. The horizontal axis of the upper and lower figures represents time, and the vertical axis represents amplitude. Figure 5c The figure only includes the vibration signals in three directions collected when the steering wheel is turned left in place. By amplifying the signals in the corresponding time period, it can be seen that the signal amplitudes at four detection points on the left steering knuckle are relatively high at this time, so it can be considered that there is a noise source on the left steering knuckle.

[0121] Accordingly, the detection points selected on the right steering knuckle include: 3 detection points on the right shock absorber, right steering knuckle, right steering knuckle-swing arm and right steering tie rod ball pin-steering knuckle. After signal measurement, it was found that the noise still existed after reducing the interference of the drive system, and the signal amplitude of the right steering tie rod ball pin-steering knuckle was the highest, so it can be considered that there is a noise source on the right steering knuckle.

[0122] Finally, based on the verification results, tape was pasted on the mating surfaces of the wheel hub bearing and the left and right steering knuckles. After testing, wear marks were found on the tape, and the specific location of the noise source was determined to be the same as the noise source location determined by the front suspension system noise source locating method provided in this application, which proves the effectiveness of this method.

[0123] As an embodiment of the present application, after determining the position of the noise source based on the front suspension system noise source positioning method provided in the present application, the front suspension system can be modeled by finite element to obtain a test model, which includes a front suspension system model and a tire model. By applying the same load as the actual road test to the tire model, the actual working condition simulation is performed on the test model to obtain simulation data about the front suspension system. The types of simulation data include but are not limited to: pressure changes on the contact surface of the parts, the deformation of the parts, and the stress magnitude of the parts. Based on the obtained simulation data, the cause of the noise source is specifically analyzed. For example, if there is a phenomenon of contact friction due to a mismatch in deformation between any two parts, the cause of the noise source at this location is friction noise. After determining the cause of the noise source, the front suspension system can be updated and designed according to the test model to eliminate the noise source.

[0124] Accordingly, please refer to Figure 6 The embodiment of the present application provides a noise source positioning device for a front suspension system. The front suspension system has several preset positions, and vibration sensors and microphones are arranged at the preset positions. The device includes:

[0125] The signal acquisition module 100 is used to collect an initial vibration signal at a preset position through a vibration sensor, and collect an audio signal at a preset position through a microphone; wherein the audio signal is noise transmitted from a noise source through the air to the preset position.

[0126] The vibration determination module 200 is used to perform frequency comparison based on the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is vibration that is transmitted from the noise source through the parts of the front suspension system to a preset position.

[0127] The target screening module 300 is used to screen the intermediate vibration signal according to the inherent properties of the parts at the preset position, and determine the target vibration signal that meets the preset noise condition.

[0128] The noise source positioning module 400 is used to perform hyperbolic positioning based on the vibration start time of the target vibration signal to obtain the position of the noise source.

[0129] In some optional implementations, the vibration determination module 200 includes:

[0130] The intermediate vibration signal determination unit is used to calculate the frequency deviation of multiple vibration peaks in the audio signal and the initial vibration signal and take the initial vibration signal whose frequency deviation is lower than the frequency deviation threshold as the intermediate vibration signal.

[0131] In some optional embodiments, the target screening module 300 includes:

[0132] The attention evaluation unit is used to evaluate the attention of the intermediate vibration signal according to the amplitude and frequency of the intermediate vibration signal, as well as the mass, stiffness and natural frequency of the part at the preset position, to obtain a vibration attention score.

[0133] The target vibration signal determination unit is used to determine the target vibration signal. If the vibration attention score meets the preset noise condition, the intermediate vibration signal corresponding to the vibration attention score is determined as the target vibration signal.

[0134] In some optional implementations, the attention evaluation unit includes:

[0135] The amplitude evaluation subunit is used to calculate the vibration response of the part at the preset position according to the amplitude of the intermediate vibration signal and the mass and stiffness of the part at the preset position to obtain an amplitude evaluation value.

[0136] The resonance evaluation subunit is used to perform resonance calculation on the part at the preset position according to the frequency of the intermediate vibration signal and the natural frequency of the part at the preset position to obtain a resonance evaluation value.

[0137] The vibration evaluation subunit is used to evaluate the intermediate vibration signal according to the amplitude evaluation quantity and the resonance evaluation quantity to obtain a vibration concern score.

[0138] In some optional embodiments, the vibration assessment subunit includes:

[0139] The amplitude scoring component is used to determine the amplitude score of the intermediate vibration signal according to the amplitude evaluation interval in which the amplitude evaluation value is located; wherein the amplitude evaluation interval is set in stages according to preset noise conditions.

[0140] The resonance scoring component is used to determine the resonance score of the intermediate vibration signal according to the resonance evaluation interval in which the resonance evaluation amount is located; wherein the resonance evaluation interval is set in stages according to preset noise conditions.

[0141] The attention score component is used to perform weighted calculation on the amplitude score and the resonance score to obtain the vibration attention score.

[0142] In some optional implementations, the noise source localization module 400 includes:

[0143] The hyperbolic surface determination unit is used to determine the spatial hyperbolic surface passing through the noise source according to the respective starting times of the first target vibration signal and the second target vibration signal; wherein the first target vibration signal and the second target vibration signal are target vibration signals transmitted by the noise source to different preset positions.

[0144] The noise source determination unit is used to obtain a plurality of spatial hyperbolic surfaces according to a plurality of groups of first target vibration signals and second target vibration signals, and determine the position of the noise source based on the intersection positions between the plurality of spatial hyperbolic surfaces.

[0145] In some optional implementations, the hyperbolic surface determination unit includes:

[0146] The difference determination subunit is used to determine the distance difference between the first distance and the second distance according to the respective starting times of the first target vibration signal and the second target vibration signal; wherein the first distance is the distance between the noise source and the first preset position, and the second distance is the distance between the noise source and the second preset position; the first preset position is the position for collecting the first target vibration signal, and the second preset position is the position for collecting the second target vibration signal.

[0147] The hyperbolic surface establishment subunit is used to establish a spatial hyperbolic surface with the first preset position and the second preset position as foci according to the distance difference.

[0148] In some optional embodiments, the form of the space hyperbolic surface is as follows:

[0149]

[0150] in, S is the distance difference, x1, y1 and z1 are the coordinates of the first preset position, and x2, y2 and z2 are the coordinates of the second preset position.

[0151] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0152] The front suspension system noise source locating device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0153] See also Figure 7 , Figure 7 It is a structural diagram of a computer device provided by an embodiment of the present application. As shown in the figure, the computer device includes: one or more processors 10, a memory 20, and an interface for connecting various components, including a high-speed interface and a low-speed interface. Each component uses different buses to communicate with each other, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0154] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0155] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0156] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0157] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0158] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0159] The embodiment of the present application also provides a computer-readable storage medium. The above method according to the embodiment of the present application can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0160] The embodiment of the present application provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method of any embodiment of the present application.

[0161] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

[0162] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0163] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0164] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0165] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0166] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0167] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0168] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0169] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0170] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

[0171] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for locating noise sources of a front suspension system, characterized in that: The front suspension system has several preset positions, and vibration sensors and microphones are arranged at the preset positions; the method comprises: The initial vibration signal at the preset position is collected by the vibration sensor, and the audio signal at the preset position is collected by the microphone; wherein the audio signal is the noise transmitted from the noise source through the air to the preset position; Performing a frequency comparison between the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is a vibration that is transmitted from the noise source through the parts of the front suspension system to the preset position; Screening the intermediate vibration signal according to the inherent properties of the part at the preset position to determine a target vibration signal that meets a preset noise condition; Hyperbolic surface positioning is performed based on the vibration start time of the target vibration signal to obtain the position of the noise source.

2. The method according to claim 1, characterized in that: The performing frequency comparison based on the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal includes: Frequency deviation calculation is performed on a plurality of vibration peaks in the audio signal and the initial vibration signal, and the initial vibration signal whose frequency deviation is lower than a frequency deviation threshold is used as the intermediate vibration signal.

3. The method according to claim 1, characterized in that The inherent properties include mass, stiffness and natural frequency; the screening of the intermediate vibration signal according to the inherent properties of the part at the preset position to determine the target vibration signal that meets the preset noise condition includes: According to the amplitude and frequency of the intermediate vibration signal, and the mass, stiffness and natural frequency of the part at the preset position, the attention degree of the intermediate vibration signal is evaluated to obtain a vibration attention degree score; If the vibration attention score meets the preset noise condition, the intermediate vibration signal corresponding to the vibration attention score is determined as the target vibration signal.

4. The method according to claim 3, characterized in that The attention level was assessed by the following methods: According to the amplitude of the intermediate vibration signal, and the mass and stiffness of the part at the preset position, a vibration response calculation is performed on the part at the preset position to obtain an amplitude evaluation value; According to the frequency of the intermediate vibration signal and the natural frequency of the part at the preset position, a resonance calculation is performed on the part at the preset position to obtain a resonance evaluation amount; The intermediate vibration signal is evaluated according to the amplitude evaluation amount and the resonance evaluation amount to obtain the vibration attention score.

5. The method according to claim 4, characterized in that The step of evaluating the intermediate vibration signal according to the amplitude evaluation amount and the resonance evaluation amount to obtain the vibration attention score includes: Determining the amplitude score of the intermediate vibration signal according to the amplitude evaluation interval in which the amplitude evaluation value is located; wherein the amplitude evaluation interval is staged according to the preset noise condition; Determining a resonance score of the intermediate vibration signal according to a resonance evaluation interval in which the resonance evaluation value is located; wherein the resonance evaluation interval is staged according to the preset noise condition; The amplitude score and the resonance score are weightedly calculated to obtain the vibration attention score.

6. The method according to claim 1, characterized in that The performing of hyperbolic surface positioning based on the start time of the target vibration signal to obtain the position of the noise source includes: Determine a spatial hyperbolic surface passing through the noise source according to respective starting times of a first target vibration signal and a second target vibration signal; wherein the first target vibration signal and the second target vibration signal are target vibration signals transmitted by the noise source to different preset positions; A plurality of spatial hyperbolic surfaces are obtained according to a plurality of groups of first target vibration signals and second target vibration signals, and the position of the noise source is determined based on intersection positions between the plurality of spatial hyperbolic surfaces.

7. The method according to claim 6, characterized in that The step of determining the spatial hyperbolic surface passing through the noise source according to the respective starting times of the first target vibration signal and the second target vibration signal includes: Determine a distance difference between a first distance and a second distance according to respective starting times of the first target vibration signal and the second target vibration signal; wherein the first distance is the distance between the noise source and a first preset position, and the second distance is the distance between the noise source and a second preset position; the first preset position is a position where the first target vibration signal is collected, and the second preset position is a position where the second target vibration signal is collected; A spatial hyperbolic surface with the first preset position and the second preset position as foci is established according to the distance difference.

8. The method according to claim 7, characterized in that The form of the space hyperbolic surface is as follows: in, S is the distance difference, x1, y1 and z1 are the coordinates of the first preset position, and x2, y2 and z2 are the coordinates of the second preset position.

9. A noise source positioning device for a front suspension system, characterized in that: The front suspension system has several preset positions, at which vibration sensors and microphones are arranged; the device includes: A signal acquisition module, used to acquire an initial vibration signal at the preset position through the vibration sensor, and to acquire an audio signal at the preset position through the microphone; wherein the audio signal is noise transmitted from the noise source through the air to the preset position; a vibration determination module, configured to perform a frequency comparison between the audio signal and the initial vibration signal to determine an intermediate vibration signal in the initial vibration signal that matches the frequency of the audio signal; wherein the intermediate vibration signal is a vibration that is transmitted from the noise source through the parts of the front suspension system to the preset position; A target screening module, used to screen the intermediate vibration signal according to the inherent properties of the part located at the preset position, and determine a target vibration signal that meets the preset noise condition; The noise source positioning module is used to perform hyperbolic surface positioning based on the vibration start time of the target vibration signal to obtain the position of the noise source.

10. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 8 by executing the computer instructions.

Images