Equivalence coefficient determination method, device and equipment and computer readable storage medium
By obtaining and analyzing the acceleration signals of vehicles traveling on roads in domestic test sites and roads in the exit area, determining the mileage of each road surface and calculating the equivalent coefficient, the problem that the vehicle durability test results cannot accurately represent the road performance in the exit area is solved, and more accurate test results and cost savings are achieved.
Patent Information
- Application Number
- CN202411645730.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-03-25
AI Technical Summary
The prior art is difficult to accurately conduct vehicle durability tests on domestic testing ground roads to represent the durability performance of vehicles on roads in export areas and is costly.
By obtaining the set of vehicle acceleration signals running on domestic test site roads and exit areas, the mileage of each characteristic road surface on the two roads is determined, and the equivalent coefficient between the two roads is calculated to adjust the number of cycles of the test conditions.
The vehicle durability test results performed on domestic test sites roads can more accurately represent the vehicle's durability performance on the roads in the export area, reducing the test cost.
Smart Images
Figure CN119691317A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle testing technology, and in particular to a method, device, equipment and computer-readable storage medium for determining an equivalent coefficient. Background Art
[0002] For vehicles exported to a certain region, it is necessary to know the durability performance of the vehicle in that region during the vehicle development stage. The current practice is to conduct vehicle durability tests directly in the region, but this method is costly.
[0003] There are usually special test roads at the vehicle production site for vehicle durability testing, but the road characteristics of the test roads and the roads in the export area are bound to be different. The results of vehicle durability tests on the test roads cannot accurately represent the durability performance of the vehicle on the roads in the export area.
[0004] Therefore, in order to save the cost of vehicle durability testing and improve the accuracy of vehicle durability test results, a solution for determining the equivalence coefficient between the test road and the exit area road is urgently needed. Summary of the invention
[0005] In order to solve the above technical problems, the present application provides a method, device, equipment and computer-readable storage medium for determining an equivalent coefficient.
[0006] In a first aspect, an embodiment of the present application provides a method for determining an equivalent coefficient, the method comprising:
[0007] Acquire a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which the first vehicle drives on a first road, the second driving process is a process in which the second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency;
[0008] Determine a first mileage of each characteristic road surface on the first road based on the first acceleration signal set;
[0009] Determine a second mileage of each characteristic road surface on the second road based on the second acceleration signal set;
[0010] For each characteristic road surface, an equivalent coefficient is obtained based on the corresponding first mileage and second mileage.
[0011] In combination with the first aspect, in one implementation, determining the first mileage of each characteristic road surface on the first road based on the first acceleration signal set includes:
[0012] Determining a value of instantaneous frequency-domain weighted acceleration in the time domain based on the first acceleration signal set;
[0013] Determining a value of a vibration measurement value in the time domain based on a value of an instantaneous frequency-domain weighted acceleration in the time domain;
[0014] Determining a maximum vibration measurement value and a minimum vibration measurement value based on the values of the vibration measurement values in the time domain;
[0015] Determining a determination threshold for each characteristic road surface based on a maximum vibration measurement value and a minimum vibration measurement value;
[0016] Determine the time interval corresponding to each characteristic road surface based on the judgment threshold of each characteristic road surface, and obtain the speed value corresponding to each moment in the time interval;
[0017] The first mileage of each characteristic road surface is obtained based on the time interval corresponding to each characteristic road surface and the speed value corresponding to each moment in the time interval.
[0018] In combination with the first aspect, in one implementation, determining the value of the instantaneous frequency-domain weighted acceleration in the time domain based on the first acceleration signal set includes:
[0019] Based on the first acceleration signal set, the root mean square acceleration value a of the 1 / 3 octave i-th frequency band corresponding to each time point is obtained. i ;
[0020] A i Substituting into the first formula, we get the value of instantaneous frequency-domain weighted acceleration in the time domain. The first formula is as follows:
[0021]
[0022] Among them, a w (t) is the value of the instantaneous frequency-domain weighted acceleration at time point (t), n is the total number of 1 / 3 octave frequency bands, W i It is the weighting coefficient corresponding to the i-th frequency band of the 1 / 3 octave band.
[0023] In combination with the first aspect, in one implementation, determining the value of the vibration measurement value in the time domain based on the value of the instantaneous frequency-domain weighted acceleration in the time domain includes:
[0024] Substituting the value of instantaneous frequency-domain weighted acceleration in the time domain into the second formula, the value of vibration measurement value in the time domain is obtained. The second formula is:
[0025]
[0026] Wherein, T is the preset measurement time, the time domain is divided into multiple unit time lengths with T as the unit, and DVD is the vibration measurement value corresponding to each unit time length in the time domain.
[0027] In combination with the first aspect, in one implementation, there are at least two characteristic road surfaces, and determining the determination threshold of each characteristic road surface based on the maximum vibration measurement value and the minimum vibration measurement value includes:
[0028] The determination threshold RN1 of the first characteristic road surface is determined based on the third formula, and the third formula is:
[0029]
[0030] Determine the judgment threshold RN of the xth characteristic road surface based on the fourth formula: x , the fourth formula is:
[0031]
[0032] Among them, DVD min is the minimum vibration measurement value, DVD max is the maximum vibration measurement value, and x is a positive integer greater than 1.
[0033] In combination with the first aspect, in one implementation, for each characteristic road surface, obtaining an equivalent coefficient based on the corresponding first mileage and second mileage includes:
[0034] For each characteristic road surface, the ratio of the corresponding first mileage to the second mileage is used as the equivalent coefficient.
[0035] In combination with the first aspect, in one implementation, the first road is a road to be subjected to a vehicle durability test, and the second road is a road on which a vehicle durability test has been conducted. After obtaining the equivalent coefficient based on the corresponding first mileage and second mileage for each characteristic road surface, the method further includes:
[0036] Check whether all equivalent coefficients are within the preset value range;
[0037] If all the equivalent coefficients are within a preset value range, the number of test condition cycles used in the vehicle durability test on the second road is adjusted based on all the equivalent coefficients.
[0038] In a second aspect, an embodiment of the present application provides an equivalent coefficient determination device, the equivalent coefficient determination device comprising:
[0039] an acquisition module, used to acquire a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency;
[0040] A first determination module is used to determine a first mileage of each characteristic road surface on a first road based on a first acceleration signal set; and to determine a second mileage of each characteristic road surface on a second road based on a second acceleration signal set;
[0041] The second determination module is used to obtain an equivalent coefficient for each characteristic road surface based on the corresponding first mileage and second mileage.
[0042] In a third aspect, an embodiment of the present application provides an equivalent coefficient determination device, which includes a processor, a memory, and an equivalent coefficient determination program stored in the memory and executable by the processor, wherein when the equivalent coefficient determination program is executed by the processor, the steps of the equivalent coefficient determination method described in the first aspect are implemented.
[0043] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which an equivalent coefficient determination program is stored, wherein when the equivalent coefficient determination program is executed by a processor, the steps of the equivalent coefficient determination method described in the first aspect are implemented.
[0044] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:
[0045] In the embodiment of the present application, a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process are obtained, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency; the first mileage of each characteristic road surface on the first road is determined based on the first acceleration signal set; the second mileage of each characteristic road surface on the second road is determined based on the second acceleration signal set; for each characteristic road surface, an equivalent coefficient is obtained based on the corresponding first mileage and second mileage. Through the embodiment of the present application, the mileage of each characteristic road surface on the two roads is determined based on the acceleration signal set when the same model vehicle is driving on the two roads, and the equivalent coefficient between the two roads is determined based on this. BRIEF DESCRIPTION OF THE DRAWINGS
[0046] Figure 1 This is a flow chart of an embodiment of a method for determining an equivalent coefficient of the present application;
[0047] Figure 2 for Figure 1 Detailed flow chart of step S20;
[0048] Figure 3 This is a functional module diagram of an embodiment of an equivalent coefficient determination device of the present application;
[0049] Figure 4 This is a schematic diagram of the hardware structure of the equivalent coefficient determination device involved in the embodiment of the present application. DETAILED DESCRIPTION
[0050] 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.
[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.
[0052] In a first aspect, an embodiment of the present application provides a method for determining an equivalent coefficient.
[0053] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the method for determining the equivalent coefficient of this application. Figure 1 As shown in Figure 2, the method for determining the equivalence coefficient includes:
[0054] Step S10, obtaining a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency;
[0055] In this embodiment, an acceleration sensor is installed on the vehicle, and when the vehicle is traveling on the first road / the second road, the acceleration sensor continuously collects acceleration signals, thereby obtaining a first / second acceleration signal set. The acceleration sensor may be installed at the center of mass of the vehicle, and may be a uniaxial, biaxial, or triaxial acceleration sensor.
[0056] For example, if a vehicle of model A needs to be exported abroad, but the vehicle of model A has not yet completed durability testing abroad, it is necessary to obtain an acceleration signal set (i.e., a first acceleration signal set) corresponding to the driving process of the first vehicle on a foreign road (i.e., the first road).
[0057] The second road takes a domestic test site road as an example, that is, an acceleration signal set (ie, a second acceleration signal set) corresponding to the second vehicle's driving process on the domestic road (ie, the second road) is obtained.
[0058] The first / second acceleration signal set is a series of acceleration signals arranged in a collection time sequence and obtained according to a preset sampling frequency during the driving process.
[0059] In addition, in order to ensure the accuracy of the final equivalent coefficient, the following requirements are made for the acceleration signal collection during driving:
[0060] The collection time is ≥ 8 hours, the collection mileage is ≥ 300 kilometers, and the sampling frequency is ≥ 512 Hz.
[0061] For example, the first vehicle travels on the first road for 10 hours and a distance of 500 kilometers. During the entire driving process, an acceleration sensor installed at the center of mass of the vehicle continuously collects acceleration signals at a sampling frequency of 512 Hz to obtain a first acceleration set.
[0062] Similarly, the second vehicle traveled on the first road for 10 hours and a distance of 600 kilometers. During the entire driving process, the acceleration sensor installed at the center of mass of the vehicle continuously collected acceleration signals at a sampling frequency of 512 Hz to obtain a second acceleration set.
[0063] Step S20, determining a first mileage of each characteristic road surface on the first road based on the first acceleration signal set;
[0064] In the present embodiment, it is easy to understand that when the vehicle travels on different characteristic roads, the size of its acceleration signal will inevitably be different. Based on this rule, the first acceleration subset corresponding to each characteristic road surface can be determined from the first acceleration signal set. The acceleration signal is time domain data, so the time period corresponding to each characteristic road surface in the first driving process can be determined. Combined with the vehicle's driving speed, the first mileage of each characteristic road surface can be determined.
[0065] Further, in one embodiment, referring to Figure 2 , Figure 2 for Figure 1 Detailed flow chart of step S20 in FIG. Figure 2 As shown, step S20 includes:
[0066] Step S201, determining a value of instantaneous frequency-domain weighted acceleration in the time domain based on a first acceleration signal set;
[0067] Furthermore, in one embodiment, step S201 includes:
[0068] Based on the first acceleration signal set, the root mean square acceleration value a of the 1 / 3 octave i-th frequency band corresponding to each time point is obtained. i ;
[0069] A iSubstituting into the first formula, we get the value of instantaneous frequency-domain weighted acceleration in the time domain. The first formula is as follows:
[0070]
[0071] Among them, a w (t) is the value of the instantaneous frequency-domain weighted acceleration at time point (t), n is the total number of 1 / 3 octave frequency bands, W i It is the weighting coefficient corresponding to the i-th frequency band of the 1 / 3 octave band.
[0072] In this embodiment, a i It can be obtained based on an acceleration signal in one direction (such as the Z axis), or it can be obtained by integrating acceleration signals in three directions.
[0073] For example, for the composite vibration in multiple directions, the total vibration of the weighted root mean square acceleration determined by the vibration in the orthogonal coordinate system is calculated as follows:
[0074] a v =(k x 2 a wx 2 +k y 2 a wy 2 +k z 2 a wz 2 ) 1 / 2
[0075] Among them, a wx 、a wy 、a wz are the weighted root mean square accelerations on the orthogonal coordinate axes x, y, and z, respectively; k x , k y , k z are the direction factors; a v is the root mean square acceleration value in the direction of the composite vibration.
[0076] Step S202, determining the value of the vibration measurement value in the time domain based on the value of the instantaneous frequency domain weighted acceleration in the time domain;
[0077] Furthermore, in one embodiment, step S202 includes:
[0078] Substituting the value of instantaneous frequency-domain weighted acceleration in the time domain into the second formula, the value of vibration measurement value in the time domain is obtained. The second formula is:
[0079]
[0080] Wherein, T is the preset measurement time, the time domain is divided into multiple unit time lengths with T as the unit, and DVD is the vibration measurement value corresponding to each unit time length in the time domain.
[0081] In this embodiment, the value of T is, for example, 0.1 s. Based on this step, the vibration measurement value that changes with time can be obtained.
[0082] Step S203, determining a maximum vibration measurement value and a minimum vibration measurement value based on the vibration measurement value in the time domain;
[0083] In this embodiment, the vibration measurement values varying with time are obtained according to step S202, and the maximum vibration measurement value and the minimum vibration measurement value can be selected therefrom.
[0084] Step S204, determining a determination threshold of each characteristic road surface based on the maximum vibration measurement value and the minimum vibration measurement value;
[0085] Further, in one embodiment, there are at least two characteristic roads, and step S204 includes:
[0086] The determination threshold RN1 of the first characteristic road surface is determined based on the third formula, and the third formula is:
[0087]
[0088] Determine the judgment threshold RN of the xth characteristic road surface based on the fourth formula: x , the fourth formula is:
[0089]
[0090] Among them, DVD min is the minimum vibration measurement value, DVD max is the maximum vibration measurement value, and x is a positive integer greater than 1.
[0091] In this embodiment, four characteristic road surfaces are taken as examples, among which the first characteristic road surface is a smooth road (such as a highway), the second characteristic road surface is a road with low roughness (such as a national highway), the third characteristic road surface is a road with wear (such as an unpaved low-slope twisted road), and the fourth characteristic road surface is a road with high road excitation intensity (such as an unpaved road with damaged road surface).
[0092] In determining the DVD min and DVD max Then, the judgment threshold of each characteristic road surface can be determined by combining the third formula and the fourth formula.
[0093] Step S205, determining the time interval corresponding to each characteristic road surface based on the determination threshold of each characteristic road surface, and obtaining the speed value corresponding to each moment in the time interval;
[0094] In this embodiment, taking the first characteristic road surface as an example, the judgment threshold is RN1, and the time point corresponding to the DVD less than or equal to RN1 is determined, thereby determining the time interval corresponding to the first characteristic road surface. In addition, the speed value corresponding to each moment in the time interval can be obtained from the driving recorder.
[0095] By analogy, the time interval corresponding to each characteristic road surface and the speed value corresponding to each moment in the time interval can be obtained.
[0096] Step S206, obtaining the first mileage of each characteristic road surface based on the time interval corresponding to each characteristic road surface and the speed value corresponding to each moment in the time interval.
[0097] In this embodiment, based on the speed value corresponding to each moment, the corresponding first mileage can be obtained by integrating the speed over time.
[0098] Step S30, determining a second mileage of each characteristic road surface on the second road based on the second acceleration signal set;
[0099] In this embodiment, the specific implementation of step S30 may refer to the description of step S20 and will not be elaborated here.
[0100] Step S40: for each characteristic road surface, an equivalent coefficient is obtained based on the corresponding first mileage and second mileage.
[0101] Furthermore, in one embodiment, step S40 includes:
[0102] For each characteristic road surface, the ratio of the corresponding first mileage to the second mileage is used as the equivalent coefficient.
[0103] In this embodiment, for ease of understanding, the following example is used for illustration:
[0104] According to the first acceleration signal set, it is determined that the first mileage of the first characteristic road surface on the first road is 18.8 kilometers, the first mileage of the second characteristic road surface is 8.9 kilometers, the first mileage of the third characteristic road surface is 6.6 kilometers, and the first mileage of the fourth characteristic road surface is 18.5 kilometers.
[0105] According to the second acceleration signal set, the second mileage of the first characteristic road surface on the second road is determined to be 17.9 kilometers, the second mileage of the second characteristic road surface is 6.6 kilometers, the second mileage of the third characteristic road surface is 5.4 kilometers, and the second mileage of the fourth characteristic road surface is 17.8 kilometers. Then:
[0106] The equivalent coefficient of the first characteristic road surface is 1.05, the equivalent coefficient of the second characteristic road surface is 1.34, the equivalent coefficient of the third characteristic road surface is 1.22, and the equivalent coefficient of the fourth characteristic road surface is 1.04.
[0107] In the embodiment of the present application, a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process are obtained, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency; the first mileage of each characteristic road surface on the first road is determined based on the first acceleration signal set; the second mileage of each characteristic road surface on the second road is determined based on the second acceleration signal set; for each characteristic road surface, an equivalent coefficient is obtained based on the corresponding first mileage and second mileage. Through the embodiment of the present application, the mileage of each characteristic road surface on the two roads is determined based on the acceleration signal set when the same model vehicle is driving on the two roads, and the equivalent coefficient between the two roads is determined based on this.
[0108] Furthermore, in one embodiment, the first road is a road to be subjected to a vehicle durability test, and the second road is a road on which a vehicle durability test has been conducted. After step S40, the method further includes:
[0109] Check whether all equivalent coefficients are within the preset value range;
[0110] If all the equivalent coefficients are within a preset value range, the number of test condition cycles used in the vehicle durability test on the second road is adjusted based on all the equivalent coefficients.
[0111] In this embodiment, the preset value range is set to [0.5, 1.5], that is, only when all equivalent coefficients are within the preset value range, it is indicated that the current equivalent coefficient is valid.
[0112] If the equivalent coefficient corresponding to the first characteristic road surface is 1.05, in order to make the working condition intensity of the vehicle durability test on the second road meet that of the first road, the number of test condition cycles corresponding to the first characteristic road surface in the number of test condition cycles used in the vehicle durability test on the second road is increased by 5%;
[0113] Similarly, if the equivalent coefficient corresponding to the second characteristic road surface is 1.34, in order to make the operating condition intensity of the vehicle durability test conducted on the second road meet that of the first road, the number of test condition cycles corresponding to the second characteristic road surface in the vehicle durability test on the second road will be increased by 34%.
[0114] By analogy, the number of test condition cycles used in the vehicle durability test on the second road is adjusted based on all equivalent coefficients so that the vehicle durability test on the second road is equivalent to the vehicle durability test on the first road.
[0115] In a second aspect, an embodiment of the present application also provides a device for determining an equivalent coefficient.
[0116] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of an embodiment of an equivalent coefficient determination device of the present application. Figure 3 As shown, the equivalence coefficient determination device includes:
[0117] An acquisition module 10 is used to acquire a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency;
[0118] A first determination module 20 is used to determine a first mileage of each characteristic road surface on the first road based on the first acceleration signal set; and to determine a second mileage of each characteristic road surface on the second road based on the second acceleration signal set;
[0119] The second determination module 30 is configured to obtain an equivalent coefficient for each characteristic road surface based on the corresponding first mileage and second mileage.
[0120] Furthermore, in one embodiment, the first determining module 20 is configured to:
[0121] Determining a value of instantaneous frequency-domain weighted acceleration in the time domain based on the first acceleration signal set;
[0122] Determining a value of a vibration measurement value in the time domain based on a value of an instantaneous frequency-domain weighted acceleration in the time domain;
[0123] Determining a maximum vibration measurement value and a minimum vibration measurement value based on the values of the vibration measurement values in the time domain;
[0124] Determining a determination threshold for each characteristic road surface based on a maximum vibration measurement value and a minimum vibration measurement value;
[0125] Determine the time interval corresponding to each characteristic road surface based on the judgment threshold of each characteristic road surface, and obtain the speed value corresponding to each moment in the time interval;
[0126] The first mileage of each characteristic road surface is obtained based on the time interval corresponding to each characteristic road surface and the speed value corresponding to each moment in the time interval.
[0127] Furthermore, in one embodiment, the first determining module 20 is configured to:
[0128] Based on the first acceleration signal set, the root mean square acceleration value A of the 1 / 3 octave i-th frequency band corresponding to each time point is obtained.i ;
[0129] A i Substituting into the first formula, we get the value of instantaneous frequency-domain weighted acceleration in the time domain. The first formula is as follows:
[0130]
[0131] Among them, a w (t) is the value of the instantaneous frequency-domain weighted acceleration at time point (t), n is the total number of 1 / 3 octave frequency bands, W i It is the weighting coefficient corresponding to the i-th frequency band of the 1 / 3 octave band.
[0132] Furthermore, in one embodiment, the first determining module 20 is configured to:
[0133] Substituting the value of instantaneous frequency-domain weighted acceleration in the time domain into the second formula, the value of vibration measurement value in the time domain is obtained. The second formula is:
[0134]
[0135] Wherein, T is the preset measurement time, the time domain is divided into multiple unit time lengths with T as the unit, and DVD is the vibration measurement value corresponding to each unit time length in the time domain.
[0136] Furthermore, in one embodiment, the first determining module 20 is configured to:
[0137] The determination threshold RN1 of the first characteristic road surface is determined based on the third formula, and the third formula is:
[0138]
[0139] Determine the judgment threshold RN of the xth characteristic road surface based on the fourth formula: x , the fourth formula is:
[0140]
[0141] Among them, DVD min is the minimum vibration measurement value, DVD max is the maximum vibration measurement value, and x is a positive integer greater than 1.
[0142] Furthermore, in one embodiment, the second determining module is used to:
[0143] For each characteristic road surface, the ratio of the corresponding first mileage to the second mileage is used as the equivalent coefficient.
[0144] Furthermore, in one embodiment, the equivalence coefficient determination device further includes an adjustment module, which is used to:
[0145] Check whether all equivalent coefficients are within the preset value range;
[0146] If all the equivalent coefficients are within a preset value range, the number of test condition cycles used in the vehicle durability test on the second road is adjusted based on all the equivalent coefficients.
[0147] Among them, the functional implementation of each module in the above-mentioned equivalent coefficient determination device corresponds to each step in the above-mentioned equivalent coefficient determination method embodiment, and its functions and implementation processes are no longer repeated here.
[0148] In a third aspect, an embodiment of the present application provides an equivalent coefficient determination device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.
[0149] Reference Figure 4 , Figure 4 Schematic diagram of the hardware structure of the equivalent coefficient determination device involved in the embodiment of the present application. In the embodiment of the present application, the equivalent coefficient determination device may include a processor, a memory, a communication interface and a communication bus.
[0150] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.
[0151] 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 equivalent coefficient determination device, and an interface used to interconnect the equivalent coefficient determination device 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.
[0152] 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.
[0153] The processor may be a general-purpose processor, and the general-purpose processor may call the equivalent coefficient determination program stored in the memory and execute the equivalent coefficient determination method 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 equivalent coefficient determination program is called may refer to the various embodiments of the equivalent coefficient determination method of the present application, which will not be repeated here.
[0154] Those skilled in the art will understand that Figure 4 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.
[0155] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.
[0156] The computer-readable storage medium of the present application stores an equivalent coefficient determination program, wherein when the equivalent coefficient determination program is executed by a processor, the steps of the equivalent coefficient determination method as described above are implemented.
[0157] Among them, the method implemented when the equivalent coefficient determination program is executed can refer to the various embodiments of the equivalent coefficient determination method of the present application, and will not be repeated here.
[0158] 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.
[0159] 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.
[0160] 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.
[0161] 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.
[0162] 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.
[0163] 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.
[0164] 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. A method for determining an equivalent coefficient, characterized in that: The method for determining the equivalent coefficient includes: Acquire a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which the first vehicle drives on a first road, the second driving process is a process in which the second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency; Determine a first mileage of each characteristic road surface on the first road based on the first acceleration signal set; Determine a second mileage of each characteristic road surface on the second road based on the second acceleration signal set; For each characteristic road surface, an equivalent coefficient is obtained based on the corresponding first mileage and second mileage.
2. The method for determining the equivalent coefficient according to claim 1, characterized in that: Determining the first mileage of each characteristic road surface on the first road based on the first acceleration signal set includes: Determining a value of instantaneous frequency-domain weighted acceleration in the time domain based on the first acceleration signal set; Determining a value of a vibration measurement value in the time domain based on a value of an instantaneous frequency-domain weighted acceleration in the time domain; Determining a maximum vibration measurement value and a minimum vibration measurement value based on the values of the vibration measurement values in the time domain; Determine a determination threshold for each characteristic road surface based on a maximum vibration measurement value and a minimum vibration measurement value; Determine the time interval corresponding to each characteristic road surface based on the judgment threshold of each characteristic road surface, and obtain the speed value corresponding to each moment in the time interval; The first mileage of each characteristic road surface is obtained based on the time interval corresponding to each characteristic road surface and the speed value corresponding to each moment in the time interval.
3. The method for determining the equivalent coefficient according to claim 2, characterized in that: Determining the value of the instantaneous frequency-domain weighted acceleration in the time domain based on the first acceleration signal set includes: Based on the first acceleration signal set, the root mean square acceleration value a of the 1 / 3 octave i-th frequency band corresponding to each time point is obtained. i ; A i Substituting into the first formula, we get the value of instantaneous frequency-domain weighted acceleration in the time domain. The first formula is as follows: Among them, a w (t) is the value of the instantaneous frequency-domain weighted acceleration at time point (t), n is the total number of 1 / 3 octave frequency bands, W i It is the weighting coefficient corresponding to the i-th frequency band of the 1 / 3 octave band.
4. The method for determining the equivalent coefficient according to claim 3, characterized in that: Determining the value of the vibration measurement value in the time domain based on the value of the instantaneous frequency-domain weighted acceleration in the time domain includes: Substitute the value of the instantaneous frequency-domain weighted acceleration in the time domain into the second formula to obtain the value of the vibration measurement value in the time domain. The second formula is: Wherein, T is the preset measurement time, the time domain is divided into multiple unit time lengths with T as the unit, and DVD is the vibration measurement value corresponding to each unit time length in the time domain.
5. The method for determining the equivalent coefficient according to claim 3, characterized in that: There are at least two characteristic road surfaces, and determining the determination threshold of each characteristic road surface based on the maximum vibration measurement value and the minimum vibration measurement value includes: The determination threshold RN1 of the first characteristic road surface is determined based on the third formula, and the third formula is: Determine the judgment threshold RN of the xth characteristic road surface based on the fourth formula: x , the fourth formula is: Among them, DVD min is the minimum vibration measurement value, DVD max is the maximum vibration measurement value, and x is a positive integer greater than 1.
6. The method for determining the equivalent coefficient according to claim 1, characterized in that: For each characteristic road surface, obtaining the equivalent coefficient based on the corresponding first mileage and second mileage includes: For each characteristic road surface, the ratio of the corresponding first mileage to the second mileage is used as the equivalent coefficient.
7. The method for determining the equivalent coefficient according to any one of claims 1 to 6, characterized in that: The first road is a road to be subjected to a vehicle durability test, and the second road is a road on which a vehicle durability test has been conducted. After obtaining the equivalent coefficient based on the corresponding first mileage and second mileage for each characteristic road surface, the method further includes: Check whether all equivalent coefficients are within the preset value range; If all the equivalent coefficients are within a preset value range, the number of test condition cycles used in the vehicle durability test on the second road is adjusted based on all the equivalent coefficients.
8. An equivalent coefficient determination device, characterized in that: The equivalent coefficient determination device comprises: an acquisition module, used to acquire a first acceleration signal set corresponding to a first driving process and a second acceleration signal set corresponding to a second driving process, wherein the first driving process is a process in which a first vehicle drives on a first road, and the second driving process is a process in which a second vehicle drives on a second road, and the first acceleration signal set and the second acceleration signal set have the same collection duration and sampling frequency; A first determination module is used to determine a first mileage of each characteristic road surface on a first road based on a first acceleration signal set; and to determine a second mileage of each characteristic road surface on a second road based on a second acceleration signal set; The second determination module is used to obtain an equivalent coefficient for each characteristic road surface based on the corresponding first mileage and second mileage.
9. An equivalence coefficient determination device, characterized in that: The equivalence coefficient determination device includes a processor, a memory, and an equivalence coefficient determination program stored in the memory and executable by the processor, wherein when the equivalence coefficient determination program is executed by the processor, the steps of the equivalence coefficient determination method according to any one of claims 1 to 7 are implemented.
10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores an equivalence coefficient determination program, wherein when the equivalence coefficient determination program is executed by a processor, the steps of the equivalence coefficient determination method according to any one of claims 1 to 7 are implemented.