A method, system and device for stripping loading interference of a car seat damping test

Abstract

The present application relates to the technical field of automobile seat performance test, and particularly relates to a method, system and device for stripping loading interference of automobile seat damping test, which comprises the following steps: determining a seat equivalent contact state representing the contact relationship between a loading execution mechanism and a seat loading part according to a target working condition; obtaining a loading additional response generated by the loading execution mechanism under a corresponding reference contact condition; obtaining a seat vibration input, a seat original vibration output and an actual seat equivalent contact state under the target working condition; determining a loading interference quantity according to the actual seat equivalent contact state and the loading additional response; performing pre-correction on the seat original vibration output based on the loading interference quantity to obtain a seat corrected vibration output; and obtaining a damping evaluation result according to the seat vibration input and the seat corrected vibration output. Through the present application, the problem that the loading contact additional response is mixed into the seat vibration output in the existing automobile seat damping test, thereby leading to the distortion of the damping evaluation, is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of automotive seat performance testing technology, and in particular to a method, system, and apparatus for removing interference during automotive seat damping testing. Background Technology

[0002] Automotive seat damping testing involves applying simulated driving vibrations or loading to a car seat on a test bench and collecting vibration responses from the seat mounting areas, cushion, backrest, or simulated human body loading areas to evaluate the seat's ability to absorb, attenuate, and transmit vibration energy. In the prior art, CN113295426A discloses a technical solution for collecting automotive seat vibration input and response based on bench testing and evaluating comfort or transmission characteristics, while CN104019888A discloses a test method for acquiring and analyzing vibration responses from different parts of the seat using a vibration platform, sensors, and data acquisition devices. The aforementioned existing technologies can reproduce seat vibration conditions, collect seat input and output responses, and evaluate damping or comfort. However, in actual automotive seat damping tests, the loading actuator usually needs to form a contact loading relationship with the seat cushion, backrest, or simulated human body loading component. This contact loading process is affected by seat cushion indentation, contact posture, changes in loading force, and the motion response of the loading mechanism itself, causing the additional response generated by the loading contact to be superimposed on the seat vibration output. Existing technologies usually directly evaluate the collected seat vibration output as the seat's own damping response, failing to distinguish between the seat's own damping response and the additional response from the loading contact. This makes the damping evaluation results easily affected by the loading contact state and difficult to accurately reflect the true damping characteristics of the automotive seat itself.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] This invention provides a method, system, and apparatus for removing interference during automotive seat damping testing, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for removing interference during a damping test of an automobile seat, the method comprising: Based on the target working conditions of the automobile seat damping test, the equivalent contact state of the seat used to characterize the contact relationship between the loading actuator and the loading part of the seat is determined; The automotive seat damping test bench was run under reference contact conditions corresponding to the equivalent contact state of the seat, and the additional loading response generated by the loading actuator was obtained. Under the target working condition, the seat vibration input, the original seat vibration output, and the actual seat equivalent contact state of the car seat under test are obtained; The loading disturbance amount is determined based on the actual seat equivalent contact state and the loading additional response. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. Based on the loaded disturbance amount, the original vibration output of the seat is corrected before damping evaluation to obtain the corrected vibration output of the seat. The damping evaluation result of the car seat under test is obtained based on the seat vibration input and the seat corrected vibration output.

[0006] Furthermore, the equivalent contact state of the seat is characterized by at least two contact parameters among the loading contact position, seat indentation, loading force, loading speed, and loading posture.

[0007] Further, obtaining the loading additional response includes: A reference element is set under the reference contact condition, so that the loading actuator and the reference element form a contact relationship corresponding to the equivalent contact state of the seat; The automotive seat damping test bench is driven to run under the target operating conditions, and the reference vibration output of the reference component is collected. The additional loading response is determined based on the reference vibration output and the body response of the reference component under the target working condition.

[0008] Furthermore, the reference component is a rigid reference component or a seat equivalent reference component with known damping characteristics.

[0009] Furthermore, obtaining the additional loading response includes obtaining multiple additional loading responses under multiple reference contact conditions, and establishing a correspondence between the seat equivalent contact state and the additional loading response.

[0010] Further, determining the amount of loading interference includes: Based on the contact state difference between the actual seat equivalent contact state and the multiple seat equivalent contact states corresponding to multiple reference contact conditions, the matching weights corresponding to the multiple loading additional responses are determined. Based on the actual seat equivalent contact state, determine the amplitude correction coefficients and / or time delay corrections corresponding to the additional loading response; The loading interference amount is obtained by fusing multiple loading additional responses based on the matching weight, the amplitude correction coefficient, and / or the time delay correction amount.

[0011] Further, the seat-corrected vibration output is obtained, including: The interference stripping confidence coefficient is determined based on the degree of matching between the actual seat equivalent contact state and the multiple seat equivalent contact states corresponding to the multiple reference contact conditions; The stripping intensity of the applied interference amount is adjusted according to the interference stripping confidence coefficient. The adjusted load interference amount is removed from the original vibration output of the seat to obtain the corrected vibration output of the seat.

[0012] Further, obtaining the damping evaluation results includes: The input-output response relationship is determined based on the seat vibration input and the seat corrected vibration output. Determine at least one of the following based on the input-output response relationship: damping attenuation parameter, vibration transmissibility, and input-output coherence; The damping attenuation parameter, the vibration transmissibility, and the input-output coherence are used as the damping evaluation result.

[0013] A system for loading interference stripping in automotive seat damping testing, the system comprising: The contact state determination module, connected to the additional response acquisition module and the test data acquisition module, determines the equivalent contact state of the seat to characterize the contact relationship between the loading actuator and the loading part of the seat, based on the target working conditions of the automotive seat damping test. An additional response acquisition module is connected to the contact state determination module and the loading disturbance determination module. It operates the automotive seat damping test bench under the reference contact conditions corresponding to the equivalent contact state of the seat and acquires the additional loading response generated by the loading actuator. The test data acquisition module is connected to the contact state determination module, the loading interference determination module, the vibration output correction module and the damping result evaluation module to acquire the seat vibration input, the original seat vibration output and the actual seat equivalent contact state of the car seat under test under the target working condition. The loading disturbance determination module is connected to the additional response acquisition module and the test data acquisition module. It determines the loading disturbance amount based on the actual equivalent contact state of the seat and the loading additional response. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. The vibration output correction module is connected to the loading disturbance determination module and the test data acquisition module. It corrects the original vibration output of the seat before damping evaluation based on the loading disturbance amount to obtain the corrected vibration output of the seat. The damping result evaluation module is connected to the vibration output correction module and the test data acquisition module, and obtains the damping evaluation result of the car seat under test based on the seat vibration input and the seat corrected vibration output.

[0014] An interference stripping device for automotive seat damping test loading is provided. The device includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, it implements the automotive seat damping test loading interference stripping method.

[0015] The technical solution of this invention can achieve the following technical effects: By determining the equivalent contact state of the seat under the target working condition, obtaining the additional response under the reference contact condition, matching the actual equivalent contact state of the seat with the additional response under the load in the formal test, correcting the original vibration output of the seat before evaluation by the load disturbance amount, and evaluating the damping based on the seat vibration input and the corrected vibration output of the seat, the influence of the additional response under the load contact is separated, effectively solving the problem of the distortion of the damping evaluation caused by the mixing of the additional response under the load contact into the seat vibration output in the existing automotive seat damping test.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for applying interference stripping during a damping test of an automobile seat. Figure 2 A schematic diagram illustrating the process of loading additional response matching fusion and seat output correction; Figure 3 A schematic diagram comparing the frequency domain response of the original vibration output and the corrected vibration output of the seat; Figure 4 This is a schematic diagram comparing the average vibration transmissibility at different frequency bands before and after correction. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1; like Figure 1 As shown, this application provides a method for removing interference during a damping test of an automotive seat, the method comprising: S10: Based on the target working conditions of the automobile seat damping test, determine the equivalent contact state of the seat used to characterize the contact relationship between the loading actuator and the loading part of the seat; S20: Run the automotive seat damping test bench under the reference contact conditions corresponding to the equivalent contact state of the seat, and obtain the additional loading response generated by the loading actuator; S30: Under target operating conditions, obtain the seat vibration input, original seat vibration output, and actual seat equivalent contact state of the car seat under test; S40: Determine the loading disturbance amount based on the actual equivalent contact state of the seat and the additional response of the loading. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. S50: Based on the applied disturbance, the original vibration output of the seat is corrected before damping evaluation to obtain the corrected vibration output of the seat; S60: Obtain the damping evaluation results of the car seat under test based on the seat vibration input and the seat corrected vibration output.

[0022] Specifically, the automotive seat damping test bench includes a seat mounting platform, a loading actuator, a vibration excitation mechanism, a sensor assembly, a data acquisition unit, and a data processing unit. The vibration excitation mechanism is used to apply vibration input corresponding to the target working condition to the seat mounting platform. The loading actuator is used to form a contact loading relationship with the seat cushion, backrest, or simulated human body loading component. The sensor assembly is used to collect seat vibration input, original seat vibration output, and loading contact related parameters. The equivalent contact state of the seat refers to a set of state information that can characterize the contact relationship between the loading actuator and the loading part of the seat. It can be composed of one or more of the following: loading contact position, loading posture, seat indentation, loading force, loading speed or contact pressure. After the target working condition is determined, the data processing unit determines the equivalent contact state of the seat for the benchmark test according to the loading position, loading method and vibration mode corresponding to the target working condition. The reference contact condition refers to the test conditions that can simulate the loading contact relationship of the car seat under test. In practice, a reference component can be installed on the car seat damping test bench so that the loading actuator and the reference component form a contact relationship corresponding to the equivalent contact state of the seat. The reference component can be a rigid reference component or an equivalent reference component of the seat with known damping characteristics. Then, the car seat damping test bench is run according to the target working conditions, the vibration output of the reference component is collected, and the additional loading response is obtained by combining the response of the reference component itself. The additional loading response refers to the response component introduced and superimposed on the vibration output by the loading actuator during the contact loading process. This response component is not related to the damping characteristics of the car seat under test. For rigid reference components, the vibration output of the reference components can be used as the additional loading response. For equivalent reference components of the seat with known damping characteristics, the part of the vibration output of the reference components after deducting the response of the reference components themselves can be used as the additional loading response. During the formal test, the automotive seat damping test bench is run under the target working conditions to collect the seat vibration input, original seat vibration output, and actual seat equivalent contact state of the automotive seat under test. The actual seat equivalent contact state refers to the real-time contact relationship formed between the loading actuator and the loading part of the automotive seat under test during the formal test. Its parameter type is consistent with the seat equivalent contact state in the benchmark test. The data processing unit determines the loading disturbance amount from the loading additional response based on the correspondence between the actual equivalent contact state of the seat and the equivalent contact state of the seat in the benchmark test. The loading disturbance amount refers to the non-seat damping response component formed by the loading actuator in the original vibration output of the seat, which is used to represent the additional response that needs to be weakened or stripped from the original vibration output of the seat in the formal test. After obtaining the applied disturbance, the data processing unit corrects the original vibration output of the seat before performing the damping evaluation, resulting in the corrected vibration output of the seat. The corrected vibration output of the seat refers to the vibration output after weakening the influence of the additional response of the applied contact, and is used to characterize the body damping response of the test car seat under the target working condition. Finally, the data processing unit calculates the damping evaluation results based on the seat vibration input and the corrected vibration output of the seat. The damping evaluation results may include damping attenuation parameters, vibration transmissibility, or input-output coherence.

[0023] The technical solution of this invention, based on the determination of the equivalent contact state of the seat under the target working condition, the acquisition of the additional response under the reference contact condition, the matching of the actual equivalent contact state of the seat and the additional response under the load in the formal test, the pre-evaluation correction of the original vibration output of the seat by the load disturbance amount, and the damping evaluation based on the seat vibration input and the seat corrected vibration output, achieves the separation of the influence of the additional response under the load contact, effectively solving the problem of the distortion of the damping evaluation caused by the mixing of the additional response under the load contact into the seat vibration output in the existing automotive seat damping test.

[0024] Furthermore, the equivalent contact state of the seat is characterized by at least two contact parameters among the loading contact position, seat indentation, loading force, loading speed, and loading posture.

[0025] As a preferred embodiment of the above, the equivalent contact state of the seat is used to characterize the actual contact relationship between the loading actuator and the loading part of the seat. It is not a single sensor data, but is composed of multiple contact parameters that can reflect the contact position, contact depth, loading intensity and loading motion state. In practice, at least two of the loading contact position, seat indentation, loading force, loading speed and loading posture can be selected as contact parameters to form the equivalent contact state of the seat. The loading contact position can be obtained through displacement sensors, encoders, or the spatial coordinates of the loading head of the loading actuator, used to determine the contact area where the loading actuator acts on the seat cushion, backrest, or simulated human body loading component; the seat indentation can be obtained through displacement changes of the loading actuator, relative displacement between the loading head and the seat surface, or independent displacement sensors, used to characterize the degree of deformation of the seat upholstery under loading; the loading force can be obtained through force sensors or feedback signals from the loading actuator, used to characterize the intensity of the force applied by the loading actuator to the loading part of the seat; the loading speed can be obtained from the time-varying loading displacement or from servo drive feedback, used to characterize the dynamic changes during the contact loading process; the loading posture can be determined by the loading head angle, loading actuator posture sensor, or multi-axis displacement relationship, used to characterize the contact direction and contact angle between the loading actuator and the loading part of the seat. In one implementation, the equivalent contact state of the seat at the nth sampling time is represented as: ; in, Indicates the equivalent contact state of the seat. Indicates the loading contact position. Indicates the amount of seat indentation. Indicates the applied force. Indicates loading speed. It indicates the loading posture; in practical applications, at least two parameters can be selected according to the sensor configuration of the test bench to form the equivalent contact state of the seat. For example, the loading force and the seat indentation amount can be used to form a two-dimensional contact state, or the loading contact position, loading force and loading posture can be used to form a multi-dimensional contact state. To facilitate matching and comparison of contact parameters with different dimensions, each contact parameter can be normalized: ; in, For the i-th contact parameter, and These are the minimum and maximum values ​​of the contact parameter within the test range, respectively. To prevent the correction constant from being zero in the denominator, These are the normalized contact parameters; the normalized contact parameters can be composed of: ; Where m represents the number of contact parameters involved in characterizing the equivalent contact state of the seat; through the above method, the equivalent contact state of the seat in the benchmark test and the actual equivalent contact state of the seat in the formal test can be expressed using the same parameter system, providing a unified basis for subsequent loading additional response matching and loading disturbance determination.

[0026] Furthermore, retrieve the loading of additional responses, including: A reference component is set under reference contact conditions so that the loading actuator and the reference component form a contact relationship corresponding to the equivalent contact state of the seat; The test bench for driving the car seat damping was operated under the target working conditions, and the reference vibration output of the reference component was collected. The additional response under load is determined based on the reference vibration output and the body response of the reference component under the target working condition.

[0027] As a preferred embodiment of the above, when obtaining the additional loading response, a reference piece is first set on the car seat damping test bench so that a contact relationship corresponding to the equivalent contact state of the seat is formed between the loading actuator and the reference piece. The reference piece is used to replace the car seat under test in the benchmark test. Its function is to enable the loading actuator to generate a contact loading response without introducing unknown seat damping characteristics, thereby separating the additional response introduced by the loading actuator itself or the loading contact process. The reference component can be installed in the same or equivalent mounting position as the car seat under test, and the contact position, contact posture, indentation state or loading force state of the loading actuator acting on the reference component are consistent with or correspond to the equivalent contact state of the seat; in this way, the loading contact relationship formed in the reference test can simulate the loading contact relationship in the formal seat test; After the reference contact conditions are established, the automotive seat damping test bench is driven to run according to the target working condition, so that the seat mounting platform generates the corresponding vibration input, and at the same time, the loading actuator applies the corresponding loading action to the reference component; the data acquisition unit collects the reference vibration output of the reference component under the target working condition; the reference vibration output includes the additional response introduced by the contact loading of the loading actuator, and may also include the body response generated by the reference component itself under the target working condition. The body response of a reference component refers to the response of a reference component under the same target working conditions due to its own structural characteristics. It can be obtained through pre-calibration, theoretical calculation, or testing when the actuator is in contact without load. When the reference component is a rigid reference component and its own damping response can be ignored, the body response of the reference component can be taken as zero or approximately zero. When the reference component is a seat equivalent reference component with known damping characteristics, the body response of the reference component can be determined based on the pre-calibration results. Under the k-th reference contact condition, the vibration output of the reference component collected in the reference test is denoted as . The response of the reference component under the target working condition is denoted as . The additional loading response generated by the loading actuator under the corresponding reference contact condition is denoted as Let the sampling time be denoted as n. Then the additional response can be determined by the following formula: ; When the reference component is a rigid reference component and the body response is negligible, a simplified form can be used: ; By using the above method, the additional response of the loading actuator under the corresponding contact relationship can be obtained before the formal testing of the car seat under test, providing basic data for subsequent determination of the loading interference and correction of the original vibration output of the seat.

[0028] Furthermore, the reference component is either a rigid reference component or a seat equivalent reference component with known damping characteristics.

[0029] As a preferred embodiment of the above, the reference component is used to replace the car seat under test under reference contact conditions, so that the loading actuator can form a loading contact relationship on a controllable object that corresponds to the formal seat test; depending on the test accuracy requirements and contact state reproduction requirements, the reference component can be a rigid reference component or a seat equivalent reference component with known damping characteristics; A rigid reference component is a reference structure whose own deformation and damping response are negligible relative to the additional response to loading contact under the target working condition. The rigid reference component can be a metal plate, a rigid support block, or a rigid seat mounting substitute. Its mounting boundary is the same as or equivalent to the mounting boundary of the car seat under test, and its loading position corresponds to the seat cushion, backrest, or simulated human loading position of the car seat under test. Using a rigid reference component can simplify the process of obtaining the additional response to loading and is suitable for test scenarios that require rapid establishment of the additional response to loading contact. A seat equivalent reference component refers to a reference structure whose installation boundary, loading contact area, indentation characteristics, or contact compliance correspond to the car seat under test, and whose own damping characteristics have been obtained in advance. The seat equivalent reference component can be a standard foam component, a standard seat cushion component, a standard backrest component, or a simulated human body loading component with calibrated damping characteristics. When using a seat equivalent reference component, the actual contact relationship of the car seat under soft contact loading state can be more closely approximated, which is suitable for test scenarios with high requirements for damping evaluation accuracy. In practice, when the main focus is on the additional response introduced by the motion of the loading actuator itself or the contact of the loading head, rigid reference components are preferred; when it is necessary to simultaneously simulate the indentation contact state of the seat cushion, backrest, or human body loading components, equivalent reference components of the seat with known damping characteristics are preferred; by using the above reference component selection method, it can be ensured that the additional loading response obtained under the reference contact conditions corresponds to the loading contact relationship in the formal seat test.

[0030] Furthermore, obtaining additional loading responses involves obtaining multiple additional loading responses under multiple baseline contact conditions and establishing a correspondence between the seat's equivalent contact state and the additional loading responses.

[0031] As a preferred embodiment of the above, in order to adapt to the changes in the loading contact state during the formal damping test, multiple reference contact conditions can be set before the formal test, and the additional loading response can be obtained under each reference contact condition. The multiple reference contact conditions can be set according to different values ​​of the seat equivalent contact state, such as changing the loading contact position, seat indentation, loading force, loading speed or loading posture, so that each reference contact condition corresponds to an identifiable seat equivalent contact state. Under the k-th reference contact condition, record the corresponding seat equivalent contact state. And retrieve the corresponding loading additional response. After completing benchmark tests under multiple reference contact conditions, a library of additional loading responses can be formed. ; in, This indicates that additional response libraries are being loaded. This represents the equivalent contact state of the seat corresponding to the k-th reference contact condition. This represents the additional loading response obtained under the k-th reference contact condition, where M represents the number of reference contact conditions and n represents the sampling time. The correspondence between the equivalent contact state of the seat and the additional response to loading can be stored using a data table, a response library, a mapping model, or a piecewise matching model. The data table method is suitable for situations where the number of reference contact conditions is small. The response library method is suitable for situations where complete time-domain or frequency-domain responses need to be saved. The mapping model method is suitable for situations where the additional response to loading needs to be continuously estimated based on the actual contact state. During formal testing, the data processing unit searches for or matches the corresponding loading additional response in the loading additional response library based on the actual seat equivalent contact state. When the actual seat equivalent contact state is consistent with or close to a certain reference contact condition, the corresponding loading additional response can be directly called. When the actual seat equivalent contact state is between multiple reference contact conditions, multiple loading additional responses can be matched or fused according to the contact state differences to obtain the loading disturbance amount corresponding to the current contact state. By acquiring additional load responses and establishing corresponding relationships under multiple reference contact conditions, we can avoid using only a single reference response to correct errors caused by all operating conditions, and enable subsequent load interference stripping to adapt to changes in seat load contact state.

[0032] Furthermore, such as Figure 2 As shown, the amount of loading interference is determined, including: Based on the contact state difference between the actual seat equivalent contact state and the multiple seat equivalent contact states corresponding to multiple reference contact conditions, determine the matching weights corresponding to multiple additional loading responses. Determine the amplitude correction coefficients and / or time delay corrections corresponding to multiple loading additional responses based on the actual equivalent contact state of the seat; The loading disturbance is obtained by fusing multiple loading-related responses based on matching weights, amplitude correction coefficients, and / or time delay corrections.

[0033] As a preferred embodiment of the above, after establishing the loading additional response library, the actual seat equivalent contact state is acquired in real time during the formal test, and the actual seat equivalent contact state is compared with the seat equivalent contact state corresponding to each reference contact condition in the loading additional response library to determine the degree of closeness between the current loading contact state and each reference contact state. To avoid the influence of different dimensions of contact parameters on the comparison results, each contact parameter can be normalized first; the i-th normalized contact parameter in the equivalent contact state of the actual seat is denoted as . Let the i-th normalized contact parameter in the k-th reference contact condition be denoted as The difference in contact state between the actual equivalent contact state of the seat and the k-th reference contact condition can be expressed as: ; in, This represents the contact state difference at the nth sampling time, where m represents the number of contact parameters involved in the comparison. This represents the weight of the i-th contact parameter. The weight can be preset according to the degree of influence of the contact parameter on the additional response of the load. For example, when the load force and indentation have a greater impact on the output, a higher weight can be set. The matching weight of each additional loading response is determined based on the contact state difference. The smaller the difference, the closer the actual loading contact state is to the corresponding reference contact condition, and the larger the proportion of the additional loading response under the reference contact condition. The matching weight can be determined by the following formula: ; in, This represents the matching weight of the k-th loaded additional response at the current sampling time, and M represents the number of baseline contact conditions in the loaded additional response library. This represents the matching sensitivity coefficient; the smaller the coefficient, the more the matching result tends to be the reference response closest to the contact state; the larger the coefficient, the smoother the fusion of multiple reference responses. Since the actual loading conditions in formal tests may differ from those in benchmark tests in terms of amplitude or time response, the amplitude correction factor and time delay correction amount can be further determined; the amplitude correction factor can be expressed as: ; in, This represents the magnitude correction factor for the k-th loaded additional response. This represents the influence coefficient of the i-th contact parameter on the amplitude of the additional response under load; the time delay correction can be expressed as: ; in, This represents the time-delay correction amount of the k-th loaded additional response relative to the original vibration output of the current seat. This represents the initial time delay under the k-th reference contact condition. This represents the influence coefficient of the i-th contact parameter on the time delay; After obtaining the matching weights, amplitude correction coefficients, and time delay corrections, the multiple loading-related responses are fused to obtain the loading disturbance amount corresponding to the current sampling time. ; in, Indicates the amount of interference loaded. This represents the k-th loading additional response after time delay correction; This represents the time delay correction in terms of the number of sampling points, when When the integer is not an integer, it is obtained through interpolation. The resulting loading disturbance can vary with the actual seat equivalent contact state, and is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat.

[0034] Furthermore, such as Figure 2 As shown, the corrected vibration output of the seat is obtained, including: The interference stripping confidence coefficient is determined based on the degree of matching between the actual seat equivalent contact state and multiple seat equivalent contact states corresponding to multiple reference contact conditions. Adjust the peeling intensity based on the interference peeling confidence coefficient; The adjusted load disturbance is separated from the original vibration output of the seat to obtain the corrected vibration output of the seat.

[0035] As a preferred embodiment of the above, after obtaining the amount of applied interference, in order to avoid overcorrection when the actual equivalent contact state of the seat is inconsistent with the reference contact conditions, the interference stripping reliability coefficient can be determined first. The interference stripping reliability coefficient is used to characterize the matching reliability between the current actual equivalent contact state of the seat and the equivalent contact state of the seat corresponding to the reference contact conditions. The higher the matching degree, the higher the reliability of the amount of applied interference in correcting the original vibration output of the seat; the lower the matching degree, the lower the stripping strength of the amount of applied interference. In one implementation, if the matching weights have been determined based on multiple baseline contact conditions, the maximum matching weight can be taken as the basis for the degree of matching; the interference stripping confidence coefficient can be expressed as: ; in, This represents the interference stripping confidence coefficient at the nth sampling time. This represents the maximum value among the matching weights corresponding to multiple baseline contact conditions. Indicates the preset matching confidence threshold; if Not less than This indicates that the current actual seat equivalent contact state matches at least one reference contact condition reliably, and the interference stripping confidence coefficient takes a higher value; if Below This indicates that the matching reliability is insufficient and the reliability coefficient of interference stripping is reduced; The peel strength of the applied interference can be adjusted by the interference peel confidence coefficient: ; in, This indicates the adjusted load interference level. This represents the amount of loading disturbance determined based on the actual equivalent contact state of the seat; Subsequently, the adjusted load disturbance is separated from the original vibration output of the seat to obtain the corrected vibration output of the seat: ; It can also be written as: ; in, This indicates the seat's corrected vibration output. This represents the original vibration output of the seat. Through this processing, when the actual contact state matches the reference contact state reliably, the additional response of the loaded contact can be sufficiently weakened. When the matching reliability is insufficient, the peel strength can be reduced, avoiding the accidental deletion of components belonging to the seat body damping response, thereby improving the stability and reliability of the damping evaluation results.

[0036] Furthermore, obtaining damping evaluation results includes: The input-output response relationship is determined based on the seat vibration input and the seat corrected vibration output. Determine at least one of the following based on the input-output response relationship: damping attenuation parameter, vibration transmissibility, and input-output coherence. At least one of the following parameters—damping attenuation parameter, vibration transmissibility, and input-output coherence—is used as the damping evaluation result.

[0037] As a preferred embodiment of the above, after obtaining the seat correction vibration output, the data processing unit uses the seat vibration input as the input signal for damping evaluation and the seat correction vibration output as the output signal for damping evaluation, and obtains the damping evaluation result of the car seat under test based on the response relationship between the two; since the seat correction vibration output has weakened the influence of the additional response of the loading contact, the evaluation result obtained based on this output is closer to the damping characteristics of the car seat body. Under frequency sweep, random vibration, or road spectrum reproduction conditions, the input-output response relationship can be determined based on the seat vibration input and the seat corrected vibration output; the seat vibration input is denoted as... The seat vibration correction output is denoted as The input-output response relationship can be expressed as: ; in, This represents the input-output response relationship obtained based on the seat-corrected vibration output. This represents the cross-power spectrum between the seat vibration input and the seat corrected vibration output. The power spectrum represents the input vibration of the seat, and f represents the frequency. Based on the input-output response relationship, the corrected vibration transmissibility can be obtained: ; in, This represents the vibration transmissibility obtained based on the seat-corrected vibration output; the vibration transmissibility is used to evaluate the ability of the tested car seat to transmit or attenuate vibrations of different frequencies; when the seat vibration input and the seat-corrected vibration output use the same type of vibration quantity... This represents the vibration transmissibility; when the two use different types of vibration quantities... This represents the input-output response relationship with corresponding dimensions; Peak sequences can be extracted from the seat-corrected vibration output under free decay or shock conditions. And calculate the damping attenuation parameters: ; in, This represents the damping attenuation parameter obtained based on the seat-corrected vibration output. denoted as the r-th peak, and l represents the number of peaks; the damping attenuation parameter is used to evaluate the vibration attenuation capability of the tested car seat after free attenuation or impact. The input-output coherence can also be calculated based on the seat vibration input and the seat corrected vibration output to determine the reliability of the evaluation results. ; in, Indicates input-output coherence. This represents the power spectrum of the seat's corrected vibration output; the higher the input-output coherence, the more stable the response relationship between the seat vibration input and the seat's corrected vibration output, and the higher the reliability of the damping evaluation results. The data processing unit can use one or more of the following as damping attenuation parameters, vibration transmissibility, and input-output coherence as damping evaluation results: by evaluating based on the seat's corrected vibration output, it can avoid the situation where the load contact additional response is mistakenly identified as the seat's own damping response due to the direct use of the seat's original vibration output. Furthermore, to demonstrate the corrective effect of load disturbance stripping on the damping evaluation results, the vibration transmissibility obtained based on the original vibration output of the seat can be denoted as... The vibration transmissibility obtained based on the seat-corrected vibration output is denoted as... And define the damping evaluation deviation correction amount: ; in, This represents the correction amount for the damping evaluation deviation caused by the stripping of loading interference at frequency f; a comprehensive evaluation correction amount can also be defined. ; in, This represents the overall correction amount for the damping evaluation results due to the application of interference stripping. This represents the average response contamination level relative to the original vibration output of the seat under the target operating condition. and These are dimensionless weighting coefficients. to For the target evaluation frequency band, To prevent dimensionless correction constants with a denominator of zero, the above indicators can be used to quantify the difference between evaluating the original vibration output of the seat directly and evaluating it using the corrected vibration output of the seat, thereby verifying the effect of loading interference stripping on improving the accuracy of damping evaluation.

[0038] Example 2; Based on the same inventive concept as the loading interference stripping method for automobile seat damping test described in the foregoing embodiments, the present invention also provides an automobile seat damping test loading interference stripping system, the system comprising: The contact state determination module, connected to the additional response acquisition module and the test data acquisition module, determines the equivalent contact state of the seat to characterize the contact relationship between the loading actuator and the loading part of the seat, based on the target working conditions of the automotive seat damping test. The additional response acquisition module is connected to the contact state determination module and the loading disturbance determination module. It runs the automotive seat damping test bench under the reference contact conditions corresponding to the equivalent contact state of the seat and acquires the additional loading response generated by the loading actuator. The test data acquisition module is connected to the contact state determination module, the loading disturbance determination module, the vibration output correction module, and the damping result evaluation module to acquire the seat vibration input, the original seat vibration output, and the actual seat equivalent contact state of the car seat under test under the target working conditions. The loading disturbance determination module is connected to the additional response acquisition module and the test data acquisition module. It determines the loading disturbance amount based on the actual equivalent contact state of the seat and the loading additional response. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. The vibration output correction module is connected to the loading disturbance determination module and the test data acquisition module. Based on the loading disturbance amount, the original vibration output of the seat is corrected before the damping evaluation to obtain the corrected vibration output of the seat. The damping result evaluation module is connected to the vibration output correction module and the test data acquisition module to obtain the damping evaluation result of the car seat under test based on the seat vibration input and the seat corrected vibration output.

[0039] The adjustment system described above in this invention can effectively realize a method for removing interference during a damping test of an automobile seat, and the technical effects it can achieve are as described in the above embodiments, and will not be repeated here.

[0040] Example 3; Based on the same inventive concept as the method for removing interference during a loading test of a car seat damping in the foregoing embodiments, the present invention also provides a device for removing interference during a loading test of a car seat damping. The device includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, it implements the method for removing interference during a loading test of a car seat damping.

[0041] Example 4; This embodiment illustrates the specific effects of using seat-corrected vibration output for damping evaluation. In this embodiment, the car seat under test is mounted on a car seat damping test bench, and the target operating condition is a sweep frequency vibration condition from 1Hz to 30Hz. During the test, the data acquisition unit synchronously collects the seat vibration input at the seat mounting surface. Original vibration output of the seat at the evaluation location The system acquires actual seat equivalent contact state parameters such as loading force, seat indentation, and loading posture through the contact state acquisition unit.

[0042] The data processing unit matches the corresponding loading additional response from a pre-established loading additional response library based on the actual equivalent contact state of the seat, and generates the loading disturbance quantity. Subsequently, based on the interference stripping confidence coefficient... Original vibration output of the seat Before evaluation, corrections were made to obtain the corrected vibration output of the seat. It satisfies: ; Then, the data processing unit outputs data based on the original vibration of the seat. Seat vibration correction output Calculate the vibration transmissibility before correction. and corrected vibration transmissivity Furthermore, the average vibration transmissibility within different frequency bands was statistically analyzed.

[0043] like Figure 3 As shown, in the main resonance sensitive frequency band, the original vibration output of the seat The peak value is relatively high; after the applied interference is stripped, the seat corrected vibration output is... The decrease in the peak value indicates that the non-seat damping response introduced by the loading actuator is weakened. For example... Figure 4 As shown, the average vibration transmissibility in the low-frequency comfort range, the main resonance sensitive range, the mid-frequency transmission range, and the high-frequency attenuation range has been corrected. The corrected average vibration transmissibility is... It can better reflect the vibration transmission and attenuation characteristics of the seat body.

[0044] Therefore, this embodiment reduces the impact of the additional response to loading contact on the damping evaluation results by correcting the original vibration output of the seat before evaluation, making the obtained damping evaluation results closer to the true damping characteristics of the car seat under test.

[0045] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A method for removing interference during a damping test of an automobile seat, characterized in that, The method includes: Based on the target working conditions of the automobile seat damping test, the equivalent contact state of the seat used to characterize the contact relationship between the loading actuator and the loading part of the seat is determined; The automotive seat damping test bench was run under reference contact conditions corresponding to the equivalent contact state of the seat, and the additional loading response generated by the loading actuator was obtained. Under the target working condition, the seat vibration input, original seat vibration output, and actual seat equivalent contact state of the car seat under test are obtained; The loading disturbance amount is determined based on the actual seat equivalent contact state and the loading additional response. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. Based on the loaded disturbance amount, the original vibration output of the seat is corrected before damping evaluation to obtain the corrected vibration output of the seat. The damping evaluation result of the car seat under test is obtained based on the seat vibration input and the seat corrected vibration output. Determining the amount of loading interference includes: Based on the contact state difference between the actual seat equivalent contact state and the multiple seat equivalent contact states corresponding to multiple reference contact conditions, the matching weights corresponding to the multiple loading additional responses are determined. Based on the actual seat equivalent contact state, determine the amplitude correction coefficients and / or time delay corrections corresponding to the additional loading response; Based on the matching weight, the amplitude correction coefficient, and / or the time delay correction amount, multiple loading additional responses are fused to obtain the loading interference amount; Obtaining the corrected vibration output of the seat includes: The interference stripping confidence coefficient is determined based on the degree of matching between the actual seat equivalent contact state and the multiple seat equivalent contact states corresponding to the multiple reference contact conditions; The stripping intensity of the applied interference amount is adjusted according to the interference stripping confidence coefficient. The adjusted load interference amount is removed from the original vibration output of the seat to obtain the corrected vibration output of the seat.

2. The method for removing interference during automotive seat damping testing according to claim 1, characterized in that, The equivalent contact state of the seat is characterized by at least two contact parameters among the following: loading contact position, seat indentation, loading force, loading speed, and loading posture.

3. The method for removing interference during automotive seat damping testing according to claim 1, characterized in that, Obtaining the loading additional response includes: A reference element is set under the reference contact condition, so that the loading actuator and the reference element form a contact relationship corresponding to the equivalent contact state of the seat; The automotive seat damping test bench is driven to run under the target working condition, and the reference vibration output of the reference component is collected; The additional loading response is determined based on the reference vibration output and the body response of the reference component under the target working condition.

4. The method for removing interference during automotive seat damping testing according to claim 3, characterized in that, The reference component is a rigid reference component or a seat equivalent reference component with known damping characteristics.

5. The method for removing interference during automotive seat damping testing according to claim 1, characterized in that, Obtaining the additional loading response includes obtaining multiple additional loading responses under multiple reference contact conditions, and establishing a correspondence between the seat's equivalent contact state and the additional loading response.

6. The method for removing interference during a damping test of an automotive seat according to claim 1, characterized in that, Obtaining the damping evaluation results includes: The input-output response relationship is determined based on the seat vibration input and the seat corrected vibration output. Determine at least one of the following based on the input-output response relationship: damping attenuation parameter, vibration transmissibility, and input-output coherence; The damping attenuation parameter, the vibration transmissibility, and the input-output coherence are used as the damping evaluation result.

7. A loading interference stripping system for automotive seat damping testing, characterized in that, The system employing the automotive seat damping test loading interference stripping method as described in claim 1 comprises: The contact state determination module, connected to the additional response acquisition module and the test data acquisition module, determines the equivalent contact state of the seat to characterize the contact relationship between the loading actuator and the loading part of the seat, based on the target working conditions of the automotive seat damping test. An additional response acquisition module is connected to the contact state determination module and the loading disturbance determination module. It operates the automotive seat damping test bench under the reference contact conditions corresponding to the equivalent contact state of the seat and acquires the additional loading response generated by the loading actuator. The test data acquisition module is connected to the contact state determination module, the loading interference determination module, the vibration output correction module and the damping result evaluation module to acquire the seat vibration input, the original seat vibration output and the actual seat equivalent contact state of the car seat under test under the target working condition. The loading disturbance determination module is connected to the additional response acquisition module and the test data acquisition module. It determines the loading disturbance amount based on the actual equivalent contact state of the seat and the loading additional response. The loading disturbance amount is used to characterize the non-seat damping response component formed by the loading actuator in the original vibration output of the seat. The vibration output correction module is connected to the loading disturbance determination module and the test data acquisition module. It corrects the original vibration output of the seat before damping evaluation based on the loading disturbance amount to obtain the corrected vibration output of the seat. The damping result evaluation module is connected to the vibration output correction module and the test data acquisition module, and obtains the damping evaluation result of the car seat under test based on the seat vibration input and the seat corrected vibration output.

8. A device for removing interference during a damping test of an automobile seat, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to implement the loading interference stripping method for automobile seat damping test as described in any one of claims 1 to 6.

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