Objective evaluation method and evaluation system for vehicle vibration comfort

Abstract

The invention relates to the technical field of passenger vehicle evaluation, in particular to an objective evaluation method and system for vehicle vibration comfort. The method comprises the following steps: classifying vibration comfort into a plurality of single indexes, and setting a characteristic test road section for each single index; acquiring a time domain signal of each test point in the driving process of the test vehicle under each characteristic test road section; carrying out data processing on the collected time domain signal to obtain an acceleration objective value of the test vehicle on each characteristic test road section; and comparing and judging the acceleration objective value on each characteristic test road section with the corresponding evaluation index to obtain an objective evaluation result of the vibration comfort of the test vehicle. According to the method, the indexes of the vibration comfort are classified into a plurality of single indexes, the appropriate characteristic test road section is designed for each single index, and different road surface characteristics and different working conditions are input into different road surface excitation of the vehicle, so that a certain phenomenon of the vibration comfort is more obvious, and evaluation of the vibration comfort of the passenger vehicle is more accurate.

Description

Technical Field

[0001] The present application relates to the technical field of passenger vehicle evaluation, and in particular to an objective evaluation method and evaluation system for vehicle vibration comfort. Background Art

[0002] Cars are becoming more and more important for people's travel. With the increasing number of cars, the industry has deepened its research and development of cars, and the gap between the basic functions of passenger cars has become smaller and smaller. Vehicle comfort has received more and more attention from users. A large number of facts show that when a car is driving, if the body of the car has strong vibrations, it will cause nausea, vomiting and other discomforts to the passengers in the car. Research further shows that even if the vibration is not strong, if the human body is in a vibrating environment for a long time, it will feel tired and weak, which is undoubtedly uncomfortable and even unsafe for the driver. The concept of driving comfort proposed is an indicator to judge whether the passengers in the car feel uncomfortable or tired due to the vibration of the body when the car is driving, and the degree of discomfort, which is also called riding comfort.

[0003] However, there are many factors that affect the ride comfort, including objective factors such as external vibration, as well as people's own subjective feelings. Moreover, when the vehicle is driving on different road conditions, the degree and type of discomfort felt by passengers are different, making it difficult for practitioners to accurately measure the vibration comfort performance of passenger cars with objective indicators. Summary of the invention

[0004] Regarding the relevant technologies, there is a lack of an objective and accurate evaluation system for vehicle ride comfort, which makes it difficult for practitioners to accurately measure the vibration comfort performance of passenger cars using objective indicators.

[0005] In a first aspect, an embodiment of the present application provides an objective evaluation method for vehicle vibration comfort, the objective evaluation method comprising:

[0006] Classify vibration comfort into multiple individual indicators according to comfort types, and set a characteristic test section for each individual indicator;

[0007] Collect the time domain signals of each measuring point during the driving process of the test vehicle on each characteristic test section;

[0008] Performing data processing on the collected time domain signals to obtain the objective acceleration value of the test vehicle on each characteristic test section;

[0009] The objective value of acceleration on each characteristic test section is compared with the corresponding evaluation index to obtain the objective evaluation result of the vibration comfort of the test vehicle.

[0010] In combination with the first aspect, in one implementation, the vibration comfort is classified into a plurality of individual indicators according to the comfort type, including:

[0011] Classify vibration comfort into primary comfort, secondary comfort, and impact comfort;

[0012] Five individual indicators are set for the main comfort, including vertical movement, head shaking, pitching, floating feeling and abrupt feeling;

[0013] Three individual indicators are set for secondary comfort, including bumpy feeling, vibration feeling and rolling feeling;

[0014] Impact comfort sets the impact feeling as a single indicator.

[0015] In conjunction with the first aspect, in one implementation, setting a characteristic test section for each single indicator includes:

[0016] The characteristic test sections corresponding to the vertical motion, head shaking, pitching, floating feeling and abrupt feeling of the main comfort are set as long-wave road surface, irregular undulating road surface, short-wave road surface, smooth asphalt road surface and damaged asphalt road surface in turn;

[0017] The secondary comfort bumpy feeling, vibration feeling and rolling feeling are set to the corresponding characteristic test sections, which are set to the continuous uneven asphalt road surface, the damaged cement road and the rough asphalt road surface respectively;

[0018] The characteristic test section corresponding to the impact feeling of impact comfort is set as a speed bump.

[0019] In combination with the first aspect, in one implementation, the data processing of the collected time domain signal includes:

[0020] The effective value of the time domain signal measured on the characteristic test section corresponding to multiple single indicators of primary comfort and secondary comfort is calculated, and the effective value is used as the objective value of acceleration of the corresponding single item.

[0021] In combination with the first aspect, in one implementation manner, the effective value calculation of the time domain signal measured at the characteristic test section corresponding to the primary comfort and the secondary comfort includes:

[0022] The time domain signal measured at the corresponding characteristic test section is converted into a power density spectrum by Fourier transform;

[0023] The effective value of different time domain signals is calculated according to the power density spectrum frequency band.

[0024] In combination with the first aspect, in one implementation, the data processing of the collected time domain signal further includes:

[0025] Low-pass filtering is performed on the time domain signal collected on the characteristic test section corresponding to the impact feeling of impact comfort;

[0026] The peak-to-peak value of the time domain signal during the entire process of the test vehicle passing through the characteristic test section corresponding to the impact feeling is taken as the objective value of the acceleration of the impact feeling.

[0027] In combination with the first aspect, in one implementation, collecting the time domain signals of each measuring point during the driving of the test vehicle on each characteristic test section includes:

[0028] An acceleration sensor in the form of a seat cushion is arranged on the seat surface, the guide rail and the backrest of the main driver's seat;

[0029] Acceleration sensors are arranged on the driver's foot floor, steering wheel and B-pillar of the vehicle body;

[0030] Collect time domain signals according to the test requirements corresponding to different individual indicators.

[0031] In combination with the first aspect, in one implementation, collecting time domain signals according to test requirements corresponding to different single indicators includes:

[0032] Collect the detection data of the acceleration sensor of the main driver's seat cushion position in the Z direction, the acceleration sensor of the B-pillar position in the Y direction, the seat cushion sensor of the main driver's backrest position in the X direction, and the acceleration data of the main driver's guide rail position in the Z direction as the time domain signals of vertical movement, head shaking, pitching, and floating feeling;

[0033] Collect the detection data of the seat cushion sensor in the X direction of the main driver's seat back position, the acceleration sensor in the Y direction of the B-pillar position, and the seat cushion sensor in the Z direction of the main driver's seat cushion position as the time domain signal of the abrupt feeling;

[0034] The detection data of the driver's seat cushion position sensor in the Z direction, the driver's guide rail position acceleration sensor in the Z direction and the steering wheel position acceleration sensor in the X direction and Z direction are collected respectively as the time domain signals of bumpy feeling, vibration feeling and rolling feeling.

[0035] In combination with the first aspect, in one embodiment, the collecting of time domain signals according to the test requirements corresponding to different single indicators further includes: collecting detection data of the acceleration sensor of the main driving guide rail in the Z direction as the time domain signal of the impact feeling.

[0036] In a second aspect, an embodiment of the present application provides a vehicle vibration comfort evaluation system, which includes: a data acquisition module, which is used to collect time domain signals of each measuring point during the driving process of the test vehicle on each characteristic test section; a calculation and processing module, which is used to perform data processing on the collected time domain signals to obtain an objective value of the acceleration of the test vehicle on each characteristic test section; a result module, which is used to compare and judge the objective value of the acceleration on each characteristic test section with the corresponding evaluation index to obtain an objective evaluation result of the vibration comfort of the test vehicle

[0037] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0038] The present application classifies vibration comfort indicators into multiple individual indicators, designs a suitable characteristic test section for each individual indicator, collects corresponding objective data, processes the data to obtain objective indicators corresponding to different vibration comfort phenomena, and accurately evaluates the vibration comfort of passenger cars through these objective indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of an embodiment of an objective evaluation method for vehicle vibration comfort of the present application;

[0040] Figure 2 A schematic diagram of the classification of evaluation indicators for vehicle vibration comfort in this application;

[0041] Figure 3 This is a waveform diagram of the time domain signal in the impact test of this application;

[0042] Figure 4 A schematic diagram of a system for evaluating vehicle vibration comfort in this application;

[0043] Figure 5 This is a schematic diagram of the power density spectrum in the vehicle test of this application;

[0044] Figure 6 This is a schematic diagram of the hardware structure of the objective evaluation device for vehicle vibration comfort involved in the embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Regarding the relevant technologies, there is a lack of an objective and accurate evaluation system for vehicle ride comfort, which makes it difficult for practitioners to accurately measure the vibration comfort performance of passenger cars using objective indicators.

[0047] In a first aspect, the present application provides an objective evaluation method for vehicle vibration comfort, the objective evaluation method comprising:

[0048] Step S1: classify vibration comfort into multiple individual indicators according to comfort type, and set a characteristic test section for each individual indicator.

[0049] It is worth noting that vibration comfort is a relatively subjective feeling, which is difficult for both passengers and designers to quantify. In this application, vibration comfort is classified into multiple single indicators, and then a specific test road can be set according to the type of single indicator. Through different road surface characteristics, different road surface characteristics and working conditions, different road surface excitations input to the vehicle can make certain phenomena of vibration comfort more obvious, make the evaluation of passenger car vibration comfort more accurate, and then distinguish the different comfort indicators exhibited by passenger cars when driving on each road surface.

[0050] Specifically, step S1 includes:

[0051] Step S1a, Figure 2 As shown, vibration comfort is classified into primary comfort, secondary comfort and impact comfort. Further, five single indicators are set for primary comfort, including vertical movement, head shaking, pitching, floating feeling and abrupt feeling. Three single indicators are set for secondary comfort, including bumpy feeling, vibration feeling and rolling feeling. Impact comfort sets impact feeling as a single indicator.

[0052] Step S1b: setting a characteristic test section for each single indicator.

[0053] Specifically, the characteristic test sections corresponding to the main comfort aspects of vertical movement, head shaking, pitching, floating feeling and abrupt feeling are set to long-wave road surface, irregular undulating road surface, short-wave road surface, smooth asphalt road and damaged asphalt road surface in turn; the corresponding characteristic test sections of the secondary comfort aspects of bumpy feeling, vibration feeling and rolling feeling are set to continuous uneven asphalt road surface, damaged cement road and rough asphalt road surface in turn; the characteristic test section corresponding to the impact feeling of impact comfort is set to speed bumps.

[0054] It can be understood that the nine evaluation indicators of passenger car vibration comfort are objectively evaluated on nine roads with different characteristics. Through the stimulation of different road characteristics, the vehicle will produce a certain obvious comfort phenomenon when driving on the road, making the objective evaluation of comfort more accurate.

[0055] Step S2: collecting time domain signals of each measuring point during the driving process of the test vehicle on each characteristic test section.

[0056] The above step S2 comprises:

[0057] Step S2a, arranging acceleration sensors in the form of seat cushions on the seat surface of the main driver's seat, the main driver's seat rails and the backrest; arranging acceleration sensors on the driver's foot floor, the steering wheel and the B-pillar of the vehicle body.

[0058] Specifically, please refer to the following table for the abbreviations of the locations of the measuring points and detailed descriptions of their layout locations:

[0059] Measuring point Position Description Driver seat cushion Main driver's seat Driver backrest Driver's seat back Main driving floor Driver's seat foot floor Main driving rail Driver's seat rail center position B-pillar The B-pillar of the vehicle body is at the same height as the driver's head when sitting steering wheel Steering wheel 12 o'clock position

[0060] It should be noted that the seat cushion sensor and acceleration sensor are arranged in the direction of the vehicle coordinate system, that is, the vehicle forward direction is +X direction, the passenger side pointing to the driver direction is +Y direction, and the vertical ground upward is +Z direction. The speed sensor is arranged below the front windshield, where the driver can easily observe it.

[0061] Step S2b: driving the test vehicle to perform a test.

[0062] Specifically, as shown in the following table, the test vehicle is driven to perform the test:

[0063] Evaluation indicators Characteristic road surface and working conditions Vertical Movement Long wave road surface 80km / h Head shaking Irregular undulating road surface 50km / h Pitch Short-wave road 50km / h Floating feeling Smooth asphalt road 140km / h Sense of abruptness Damaged asphalt road 60km / h Bumpy feeling Continuous uneven asphalt road 60km / h Vibration Damaged cement road 60km / h Rolling feel Rough asphalt road 60km / h Impact Speed ​​bump 30km / h

[0064] Furthermore, the test vehicle is driven on the test road surfaces and working conditions corresponding to the evaluation indicators of vibration comfort of passenger vehicles in the above table, the time domain signals of each measuring point when driving on each road surface are collected, and the collected time domain signals are stored.

[0065] It should be noted that when driving the test vehicle, the vehicle speed should be stabilized according to the working conditions of each road surface, and the error with the target speed should be within ±1km / h. After entering the evaluation road surface area, the test should be started, and the acceleration time domain signal of each response point should be collected, and the collected time domain signal data should be stored in the data storage module. During the test, the test vehicle should keep driving in a straight line, with hands gently stroking the steering wheel, the body relaxed, and no artificial shaking.

[0066] Step S2c: collecting time domain signals according to the test requirements corresponding to different single indicators.

[0067] Specifically, the detection data of the main driver's seat cushion position acceleration sensor in the Z direction, the B-pillar position acceleration sensor in the Y direction, the main driver's backrest position cushion sensor in the X direction, and the main driver's guide rail position acceleration in the Z direction are collected as time domain signals of vertical movement, head shaking, pitching, and floating feeling; the detection data of the main driver's backrest position cushion sensor in the X direction, the B-pillar position acceleration sensor in the Y direction, and the main driver's seat cushion position cushion sensor in the Z direction are collected as time domain signals of abrupt feeling; the detection data of the main driver's seat cushion position cushion sensor in the Z direction, the main driver's guide rail position acceleration sensor in the Z direction and the steering wheel position acceleration sensor in the X direction and Z direction are collected as time domain signals of bumpy feeling, vibration feeling, and rolling feeling. The detection data of the main driver's guide rail acceleration sensor in the Z direction is collected as the time domain signal of impact feeling.

[0068] Step S3: performing data processing on the collected time domain signals to obtain objective acceleration values ​​of the test vehicle on each characteristic test section.

[0069] The above step S3 includes:

[0070] Step S3a, calculating the effective value of the time domain signal measured on the characteristic test section corresponding to the multiple single indicators of primary comfort and secondary comfort, and using the effective value as the objective value of the acceleration of the corresponding single indicator.

[0071] Specifically, the time domain signal measured at the corresponding characteristic test section is converted into a power density spectrum (PSD) through Fourier transform, with a frequency resolution of 0.25Hz. The effective value of the time domain signal measured at the characteristic test section corresponding to multiple single indicators of primary comfort and secondary comfort is calculated, and the effective value is used as the objective value of the acceleration of the corresponding single item.

[0072] Furthermore, effective values ​​(RMS) of different time domain signals are calculated according to the frequency bands of the power density spectrum.

[0073] Specifically, the calculation method for obtaining the objective value of the acceleration at the corresponding measuring point of each road surface is as follows:

[0074]

[0075] Further, taking the frequency resolution of 0.25 Hz as an example, Figure 5 Figure 1 shows an example of calculating the RMS value of the power density (PSD) spectrum.

[0076] In some implementations, taking the 0-3 Hz frequency band as an example, the RMS value is calculated as:

[0077]

[0078] The RMS values ​​of other frequency bands are calculated similarly to the RMS value of the frequency band 0-3Hz, where j and k are the start and end frequencies of the calculated frequency band respectively:

[0079]

[0080] Step S3b, calculating the objective value of impact acceleration.

[0081] Specifically, the time domain signal tested in the above speed bump is firstly subjected to a 30Hz low-pass filter, and then the peak-to-peak value of the time domain signal of the entire process of the vehicle passing through the speed bump is taken, and the peak-to-peak value is taken as the objective value of the acceleration of the corresponding measuring point. The specific test process is shown in the following table:

[0082]

[0083] Furthermore, if Figure 3 As shown, the peak-to-peak value of the time domain signal of the seat rail after 30Hz low-pass filtering is taken as the difference between the maximum peak value and the minimum peak value.

[0084] Step S4: Compare and judge the objective value of acceleration on each characteristic test section with the corresponding evaluation index to obtain an objective evaluation result of the vibration comfort of the test vehicle.

[0085] Specifically, when evaluating the comfort test results of different vehicles, the objective results obtained in the above steps can be used for evaluation. The specific evaluation relationship corresponds to the following table:

[0086]

[0087]

[0088] In a second aspect, the present application provides a vehicle vibration comfort evaluation system, which includes: a data acquisition module, a calculation processing module and a result module; wherein:

[0089] A data acquisition module is used to collect time domain signals of each measuring point during the test vehicle's driving on each characteristic test section; a calculation and processing module is used to process the collected time domain signals to obtain the objective value of the test vehicle's acceleration on each characteristic test section; and a result module is used to compare and judge the objective value of the acceleration on each characteristic test section with the corresponding evaluation index to obtain an objective evaluation result of the vibration comfort of the test vehicle.

[0090] In conjunction with the second aspect, in some implementations, the data acquisition module includes: an acceleration sensor, a seat cushion acceleration sensor, and a vehicle speed sensor.

[0091] Multiple acceleration sensors are arranged at the 12 o'clock position of the steering wheel of the test vehicle, at the height of the B-pillar of the vehicle body and the driver's head, and in the middle of the main driver's seat rail; seat cushion sensors are arranged at the driver's seat cushion and driver's seat back of the test vehicle.

[0092] Furthermore, each sensor may set the signal acquisition frequency to 100 Hz and the acquisition time to 15 s.

[0093] Furthermore, the vehicle vibration comfort evaluation system also includes a data storage module, a data acquisition module is used to store data in the data storage module, a data calculation and processing module calculates and processes the data in the data storage module, and exports the calculated and processed objective data of various indicators of passenger car comfort to the result module.

[0094] It is worth noting that, based on the characteristics of the test road surface, the present invention subdivides ride comfort into 9 small evaluation items based on the different vibration comfort phenomena exhibited by passenger cars with different road surface characteristics, and each road surface corresponds to a different comfort phenomenon evaluation; by collecting the acceleration time domain signal during driving under each road surface condition, and processing the data in different ways, objective indicators corresponding to different vibration comfort phenomena are obtained, and the vibration comfort of passenger cars is evaluated through these objective indicators, and a modular test acquisition and processing system is formed to collect, store, calculate and display the data.

[0095] On the third aspect, an embodiment of the present application provides an objective evaluation device for vehicle vibration comfort. The objective evaluation device for vehicle vibration comfort may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0096] Reference Figure 6 , Figure 6 The hardware structure diagram of the objective evaluation device for vehicle vibration comfort involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the objective evaluation device for vehicle vibration comfort may include a processor, a memory, a communication interface, and a communication bus.

[0097] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0098] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the devices inside the objective evaluation device for vehicle vibration comfort, and an interface used to interconnect the objective evaluation device for vehicle vibration comfort with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0099] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0100] The processor may be a general-purpose processor, which may call the objective evaluation program of the vehicle vibration comfort stored in the memory and execute the objective evaluation method of the vehicle vibration comfort provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the objective evaluation program of the vehicle vibration comfort is called may refer to the various embodiments of the objective evaluation method of the vehicle vibration comfort of the present application, which will not be repeated here.

[0101] Those skilled in the art will understand that Figure 6 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0102] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0103] The readable storage medium of the present application stores an objective evaluation program for vehicle vibration comfort, wherein when the objective evaluation program for vehicle vibration comfort is executed by a processor, the steps of the objective evaluation method for vehicle vibration comfort as described above are implemented.

[0104] Among them, the method implemented when the objective evaluation program of vehicle vibration comfort is executed can refer to the various embodiments of the objective evaluation method of vehicle vibration comfort of the present application, and will not be repeated here.

[0105] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0106] In summary, the present application has made a detailed division of the evaluation content of the vibration comfort of passenger cars, and divided the vibration comfort of passenger cars into three parts: primary comfort, secondary comfort, and impact comfort evaluation. Each part has several evaluation indicators, thereby refining the evaluation indicators and quantifying the evaluation standards. The vibration comfort test and evaluation of the present invention all use acceleration sensors. The arrangement of acceleration sensors in the test is more convenient, and the subsequent data processing is also more convenient. And objective evaluation indicators are given to evaluate each phenomenon of passenger car vibration comfort. Furthermore, the vibration comfort of passenger cars is evaluated through the vibration comfort phenomenon manifested by different road surface characteristics; different road surface characteristics and working conditions, different road surface excitations input to the vehicle, can make certain phenomena of vibration comfort more obvious, and make the evaluation of passenger car vibration comfort more accurate.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0108] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0109] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0110] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0111] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0112] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An objective evaluation method for vehicle vibration comfort, characterized in that: The objective evaluation method includes: Classify vibration comfort into multiple individual indicators according to comfort types, and set a characteristic test section for each individual indicator; Collect the time domain signals of each measuring point during the driving process of the test vehicle on each characteristic test section; Performing data processing on the collected time domain signals to obtain the objective acceleration value of the test vehicle on each characteristic test section; The objective value of acceleration on each characteristic test section is compared with the corresponding evaluation index to obtain the objective evaluation result of the vibration comfort of the test vehicle.

2. The objective evaluation method according to claim 1, characterized in that: The vibration comfort is classified into multiple individual indicators according to the comfort type, including: Classify vibration comfort into primary comfort, secondary comfort, and impact comfort; Five individual indicators are set for the main comfort, including vertical movement, head shaking, pitching, floating feeling and abrupt feeling; Three individual indicators are set for secondary comfort, including bumpy feeling, vibration feeling and rolling feeling; Impact comfort sets the impact feeling as a single indicator.

3. The objective evaluation method according to claim 2, characterized in that: The characteristic test section is set for each single indicator, including: The characteristic test sections corresponding to the vertical motion, head shaking, pitching, floating feeling and abrupt feeling of the main comfort are set as long-wave road surface, irregular undulating road surface, short-wave road surface, smooth asphalt road surface and damaged asphalt road surface in turn; The secondary comfort bumpy feeling, vibration feeling and rolling feeling are set to the corresponding characteristic test sections, which are set to the continuous uneven asphalt road surface, the damaged cement road and the rough asphalt road surface respectively; The characteristic test section corresponding to the impact feeling of impact comfort is set as a speed bump.

4. The objective evaluation method according to claim 2, characterized in that: The data processing of the collected time domain signal includes: The effective value of the time domain signal measured on the characteristic test section corresponding to multiple single indicators of primary comfort and secondary comfort is calculated, and the effective value is used as the objective value of acceleration of the corresponding single item.

5. The objective evaluation method according to claim 4, characterized in that: The effective value calculation of the time domain signal measured on the characteristic test section corresponding to the primary comfort and the secondary comfort includes: The time domain signal measured at the corresponding characteristic test section is converted into a power density spectrum by Fourier transform; The effective value of different time domain signals is calculated according to the power density spectrum frequency band.

6. The objective evaluation method according to claim 2, characterized in that: The data processing of the collected time domain signal also includes: Low-pass filtering is performed on the time domain signal collected on the characteristic test section corresponding to the impact feeling of impact comfort; The peak-to-peak value of the time domain signal during the entire process of the test vehicle passing through the characteristic test section corresponding to the impact feeling is taken as the objective value of the acceleration of the impact feeling.

7. The objective evaluation method according to claim 2, characterized in that: The acquisition of time domain signals of each measuring point during the driving of the test vehicle on each characteristic test section includes: An acceleration sensor in the form of a seat cushion is arranged on the seat surface, the guide rail and the backrest of the main driver's seat; Acceleration sensors are arranged on the driver's foot floor, steering wheel and B-pillar of the vehicle body; Collect time domain signals according to the test requirements corresponding to different individual indicators.

8. The objective evaluation method according to claim 7, characterized in that: The collecting of time domain signals according to the test requirements corresponding to different single indicators includes: Collect the detection data of the acceleration sensor of the main driver's seat cushion position in the Z direction, the acceleration sensor of the B-pillar position in the Y direction, the seat cushion sensor of the main driver's backrest position in the X direction, and the acceleration data of the main driver's guide rail position in the Z direction as the time domain signals of vertical movement, head shaking, pitching, and floating feeling; Collect the detection data of the seat cushion sensor in the X direction of the driver's seat back position, the acceleration sensor in the Y direction of the B-pillar position, and the seat cushion sensor in the Z direction of the driver's seat cushion position as the time domain signal of the abrupt feeling; The detection data of the driver's seat cushion position sensor in the Z direction, the driver's guide rail position acceleration sensor in the Z direction and the steering wheel position acceleration sensor in the X direction and Z direction are collected respectively as the time domain signals of bumpy feeling, vibration feeling and rolling feeling.

9. The objective evaluation method according to claim 8, characterized in that: The collecting of time domain signals according to the test requirements corresponding to different single indicators also includes: collecting detection data of the acceleration sensor of the main driving guide rail in the Z direction as the time domain signal of the impact feeling.

10. A vehicle vibration comfort evaluation system, characterized in that: include: A data acquisition module, which is used to collect time domain signals of each measuring point during the driving process of the test vehicle on each characteristic test section; A calculation processing module, which is used to perform data processing on the collected time domain signals to obtain an objective value of the acceleration of the test vehicle on each characteristic test section; The result module is used to compare and judge the objective value of acceleration on each characteristic test section with the corresponding evaluation index to obtain the objective evaluation result of the vibration comfort of the test vehicle.

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