CN117723319A - Fatigue acceleration test spectrum generation method, device and storage medium - Google Patents
Fatigue acceleration test spectrum generation method, device and storage medium Download PDFInfo
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Abstract
The disclosure provides a fatigue acceleration test spectrum generation method, a device and a storage medium, and relates to the technical field of automobiles. The fatigue acceleration test spectrum generation method comprises the following steps: acquiring acceleration signals acquired in a real lane road test process; according to the acceleration signals, obtaining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition; determining an impact response envelope spectrum of the whole life cycle and a fatigue damage spectrum of the whole life cycle according to the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition; and constructing a vibration bench test spectrum according to the damage equivalent and fatigue damage spectrum of the whole life cycle, and obtaining a fatigue acceleration test spectrum by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle.
Description
Technical Field
The disclosure relates to the technical field of automobiles, in particular to a fatigue acceleration test spectrum generation method, a device and a storage medium.
Background
The fatigue failure and fracture conditions of the bracket structure are frequently found in the vehicle development and real vehicle test process, and the fatigue failure of the bracket structure belongs to the vibration fatigue failure category through analysis. The test spectrum which can reflect the real loading condition of the bracket and is beneficial to the loading of the vibration fatigue test bed is researched in engineering, the product development period and test time can be shortened, and the fatigue life of the bracket can be rapidly and effectively assessed.
At present, two main methods for compiling fatigue acceleration test spectra of automobile bracket structures are as follows: a time domain acceleration method and a frequency domain acceleration method. The time domain acceleration method mainly comprises the steps of compressing a load spectrum in a time domain by setting a threshold value, eliminating a small load, increasing a load amplitude, filtering, performing time-associated damage editing, extracting peaks and valleys and the like, shortening test time, and converting an accelerated time domain signal into a PSD (Power Spectral Density, power spectrum density) spectrum for vibration fatigue acceleration test. The frequency domain acceleration method mainly comprises the steps of deducing a bench simulation test spectrum based on vibration data in an actual measurement time domain, determining the test spectrum from test magnitude, test time and test condition coefficients, and finally using the synthesized acceleration power density spectrum for input of a vibration test bench.
Disclosure of Invention
It is an object of the present disclosure to improve the accuracy of fatigue damage assessment of a vehicle structure.
According to an aspect of some embodiments of the present disclosure, there is provided a fatigue acceleration test spectrum generation method, including: acquiring acceleration signals acquired in a real lane road test process; according to the acceleration signals, obtaining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition; determining an impact response envelope spectrum of the whole life cycle and a fatigue damage spectrum of the whole life cycle according to the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition; and constructing a vibration bench test spectrum according to the damage equivalent and fatigue damage spectrum of the whole life cycle, and obtaining a fatigue acceleration test spectrum by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle.
In some embodiments, obtaining the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition according to the acceleration signal includes: preprocessing the acceleration signal to eliminate an interference signal and acquire an acceleration preprocessing signal; and acquiring an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration preprocessing signal.
In some embodiments, obtaining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition includes: determining an acceleration signal corresponding to each road condition according to the test road condition of the time period of acquiring the acceleration signal; according to the acceleration signals corresponding to each road condition, determining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition by constructing a simulation environment.
In some embodiments, determining the full life cycle impact response envelope spectrum and the full life cycle fatigue damage spectrum from the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition comprises: determining an impact response envelope spectrum of the whole life cycle by acquiring the maximum value of impact response spectrums corresponding to road conditions under different road conditions; and determining the fatigue damage spectrum of the whole life cycle by acquiring the weighted sum of the fatigue damage spectrums corresponding to the road conditions under different road conditions.
In some embodiments, obtaining the fatigue acceleration test spectrum by performing a limit response analysis on the vibration bench test spectrum according to the full life cycle impact response envelope spectrum comprises: carrying out limit response spectrum analysis on the vibration bench experimental spectrum to obtain a limit response spectrum; and comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bed until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle to obtain a fatigue acceleration test spectrum.
In some embodiments, acquiring acceleration signals acquired during a real-lane road test includes: in the real-lane road test process, acceleration data detected by acceleration sensors arranged at a plurality of frame excitation points connected with an automobile bracket and a frame are obtained, wherein the acceleration signals comprise corresponding relations between the acceleration data and time.
According to an aspect of some embodiments of the present disclosure, there is provided a fatigue acceleration test spectrum generating apparatus including: the acceleration signal acquisition unit is configured to acquire acceleration signals acquired in the real lane road test process; the acceleration signal processing unit is configured to acquire an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration signal; a full life data acquisition unit configured to determine an impact response envelope spectrum of a full life cycle and a fatigue damage spectrum of the full life cycle according to an impact response spectrum corresponding to a road condition and a fatigue damage spectrum corresponding to the road condition; the test spectrum generating unit is configured to construct a vibration bench test spectrum according to the damage equivalent and fatigue damage spectrum of the whole life cycle, and obtain a fatigue acceleration test spectrum by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle.
In some embodiments, the acceleration signal processing unit is configured to: preprocessing the acceleration signal to eliminate an interference signal and acquire an acceleration preprocessing signal; and acquiring an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration preprocessing signal.
In some embodiments, the acceleration signal processing unit is configured to include: determining an acceleration signal corresponding to each road condition according to the test road condition of the time period of acquiring the acceleration signal; according to the acceleration signals corresponding to each road condition, determining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition by constructing a simulation environment.
In some embodiments, the full life data acquisition unit is configured to: determining an impact response envelope spectrum of the whole life cycle by acquiring the maximum value of impact response spectrums corresponding to road conditions under different road conditions; and determining the fatigue damage spectrum of the whole life cycle by acquiring the weighted sum of the fatigue damage spectrums corresponding to the road conditions under different road conditions.
In some embodiments, the trial spectrum generation unit is configured to: carrying out limit response spectrum analysis on the vibration bench experimental spectrum to obtain a limit response spectrum; and comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bed until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle to obtain a fatigue acceleration test spectrum.
In some embodiments, the acceleration signal acquisition unit is configured to acquire acceleration data detected by acceleration sensors installed at a plurality of frame excitation points where the automobile bracket is connected with the frame during the real-lane road test, wherein the acceleration signal includes a correspondence relationship between the acceleration data and time.
According to an aspect of some embodiments of the present disclosure, there is provided a fatigue acceleration test spectrum generating apparatus including: a memory; and a processor coupled to the memory, the processor configured to perform any of the fatigue acceleration test spectrum generation methods mentioned above based on instructions stored in the memory.
According to an aspect of some embodiments of the present disclosure, a non-transitory computer-readable storage medium is presented, on which is stored computer program instructions, which when executed by a processor, implement the steps of any one of the fatigue acceleration test spectrum generation methods mentioned above.
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The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:
FIG. 1 is a flow chart of some embodiments of a fatigue acceleration test spectrum generation method of the present disclosure.
FIG. 2 is a flow chart of other embodiments of a fatigue acceleration test spectrum generation method of the present disclosure.
FIG. 3 is a schematic diagram of some embodiments of a fatigue acceleration test spectrum generation device of the present disclosure.
FIG. 4 is a schematic illustration of further embodiments of a fatigue acceleration test spectrum generating device of the present disclosure.
FIG. 5 is a schematic diagram of still further embodiments of a fatigue acceleration test spectrum generating device of the present disclosure.
Detailed Description
The technical scheme of the present disclosure is described in further detail below through the accompanying drawings and examples.
There are some schemes for vibration acceleration fatigue load spectrum programming in the related art. For example, the time-dependent damage editing method is applied to accelerate the original spectrum, the fatigue damage spectrum under each working condition is directly calculated based on a fatigue damage spectrum calculation formula proposed by Lanone on the basis of the actually measured load spectrum, and damage superposition is carried out to form a total damage spectrum, so that the total damage spectrum is converted into a PSD spectrum of random acceleration vibration. For another example, by analyzing the environmental characteristics of the actual measurement vibration spectrum of the tracked vehicle, a method for deducing the corresponding test magnitude and test time is disclosed, wherein the method comprises the steps of providing a broadband random vibration background spectrum and overlapping narrowband components as basic spectrum shapes of a simulation test spectrum, and deducing the simulation test spectrum from the actual measurement vibration data. For another example, the vibration environment characteristics of the finished product of the aero-engine are obtained through test and test on the vibration environment characteristics of the finished product of the aero-engine, and on the basis, a load spectrum for the test on the vibration environment of the finished product is established by adopting a weighting coefficient method according to the service life section and the task section of the engine.
However, the solutions in the related art are bench vibration test spectrums compiled for specific structural members under specific vibration environments. In addition, some important frequency information can be lost based on a time domain acceleration method, fatigue life estimation is carried out on time domain load input by a quasi-static method, and on the premise that the load frequency is lower than the structure natural frequency by 1/3, the first-order natural frequency of random vibration can overlap with the excitation frequency, so that calculation is inaccurate and the actual deviation is large; the frequency domain acceleration method is based on the fact that too many test condition coefficients are involved, parameters are not easy to determine, errors are likely to be large, the method is complex, and applicability is poor.
In view of the above problems, the present disclosure provides a method, an apparatus, and a storage medium for generating a fatigue acceleration test spectrum, so as to improve accuracy of a fatigue acceleration test spectrum of a vehicle and accuracy of fatigue damage assessment of a vehicle structure.
A flowchart of some embodiments of the fatigue acceleration test spectrum generation method of the present disclosure is shown in fig. 1.
In step S11, an acceleration signal acquired during the real-lane road test is acquired, where the acceleration signal includes a correspondence between acceleration data and time.
In some embodiments, an acceleration sensor may be installed at a frame excitation point where an automobile bracket of a vehicle is connected to a frame in advance, and real-time sensor detection data, which is real-time acceleration data, that is, acceleration-time data, is collected through a real-vehicle road test as an acceleration signal.
In some embodiments, the excitation point is at the location of a frame excitation component that connects the automotive bracket to the frame. In some embodiments, the number of excitation points may be multiple, and the acceleration sensors are deployed separately, so as to realize data acquisition of multiple positions at a time.
In some embodiments, the real vehicle road test can be performed under real user typical road conditions or standard test field conditions, and the acceleration-time information is obtained through repeated tests. In some embodiments, the test road includes multiple road conditions, thereby improving the comprehensiveness of the data acquisition.
In step S12, an SRS (Shock Response Spectrum, impact response spectrum) corresponding to the road condition and an FDS (Fatigue Damage Spectrum ) corresponding to the road condition are acquired based on the acceleration signal. In some embodiments, the acceleration signal corresponding to each road condition may be determined according to the road condition corresponding to the acceleration signal; and further, according to the acceleration signal corresponding to each road condition, determining SRS corresponding to the road condition and FDS corresponding to the road condition by constructing a simulation environment.
And the SRS is a maximum response displacement total result obtained after input excitation passes through a plurality of single-degree-of-freedom systems with different natural frequencies, excitation responses under different natural frequencies are calculated based on a single-degree-of-freedom system assumption, and maximum amplitudes of the responses under different frequencies are found and connected together to form the SRS.
The FDS is formed by counting rain flows on the basis of obtaining displacement response results under different frequencies, then respectively obtaining fatigue damage values under different frequencies based on a Miner linear damage theory, and finally connecting the damage values.
In some embodiments, the acceleration signal may be preprocessed to eliminate the interference signal, so as to obtain an acceleration preprocessing signal, and further obtain an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration preprocessing signal.
In some embodiments, preprocessing mainly includes smoothing the original signal, such as low-pass filtering, and detecting abnormal signals, such as deburring, data slicing, removing trend terms, and the like, so as to improve data reliability. In some embodiments, the preprocessing further includes analyzing the acceleration signal in the time domain and the frequency domain to obtain SRS and FDS based on the analysis result.
In some embodiments, after the acceleration preprocessing signal is obtained, splitting the acceleration preprocessing signal according to the road condition corresponding to the acceleration signal, and determining the acceleration preprocessing signal corresponding to each road condition; and further, according to the acceleration preprocessing signals corresponding to each road condition, determining SRS corresponding to the road condition and FDS corresponding to the road condition by constructing a simulation environment.
In some embodiments, the simulation environment may be built in nCode software. Calculating impact response spectrum g under different road segment working conditions by constructing a flow chart in nCode software i And fatigue damage spectrum d i Where i represents different road segment conditions.
In step S13, an impact response envelope spectrum of the full life cycle and a fatigue damage spectrum of the full life cycle are determined according to the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition.
In some embodiments, the full life cycle impulse response envelope spectrum may be determined by obtaining the maximum of the impulse response spectrum corresponding to the road condition under different road conditions.
In some embodiments, the fatigue damage spectrum of the full life cycle is determined by obtaining a weighted sum of fatigue damage spectra corresponding to road conditions under different road conditions, and in some embodiments, the weight is the number of cycles corresponding to road conditions.
In some embodiments, the limited measured acceleration signal can be extrapolated to a target mileage, i.e., the mileage within the full life cycle, and the cycle number after the mileage extrapolation for different road conditions is calculated, using k i And the cycle times of the working conditions of each road section after the actual measurement signal mileage extrapolation are represented, and an impact response envelope spectrum G and a fatigue total damage spectrum D of the whole life cycle are further calculated.
In step S14, a vibration bench test spectrum is constructed from the fatigue damage spectrum of the damage equivalent and the full life cycle. Further, the fatigue acceleration test spectrum is obtained by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle. And carrying out fatigue damage assessment on the vehicle structure according to the fatigue acceleration test spectrum.
In some embodiments, after the vibration bench test spectrum is obtained, obtaining a limit response spectrum by performing a limit response spectrum analysis on the vibration bench test spectrum; further, comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bench until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle, so as to obtain the fatigue acceleration test spectrum.
In some embodiments, a process is built in nCode software to finish the output of a vibration fatigue acceleration test spectrum (a random PSD spectrum or a sinusoidal sweep frequency signal), and the calculation method can be programmed and modularized, so that the implementation difficulty is reduced, and the efficiency of test spectrum synthesis is improved.
Based on the method in the embodiment shown above, the accuracy of the excitation signal can be ensured based on the road measured data of the test field, a test spectrum equivalent to the actual fatigue damage is created for the vibration fatigue test bed, the test spectrum is ensured not to exceed the actual vibration level, the vibration fatigue of the bracket structure is accelerated based on the fatigue damage equivalent theory, the consistency of the vibration bench test and the actual road test damage is ensured, and the precision of structural fatigue damage assessment is improved.
A flowchart of further embodiments of the fatigue acceleration test spectrum generation method of the present disclosure is shown in fig. 2.
In step 210, acceleration data detected by acceleration sensors mounted at a plurality of frame excitation points where the vehicle support is connected to the frame during a real-vehicle road test is obtained, and in some embodiments, the acceleration signal includes a correspondence between the acceleration data and time.
In some embodiments, the vehicle performs a real-lane road test at a professional integrated test facility or at a user's typical road conditions, the test performing the test in accordance with the relevant test specifications.
In step 221, the acceleration signal is preprocessed to eliminate the interference signal, and an acceleration preprocessing signal is obtained.
In some embodiments, the preprocessing mainly comprises noise reduction filtering, trend term removal, singular value elimination and the like, and analyzes the acceleration signals in the time domain and the frequency domain to ensure the authenticity and the reliability of the acquired signals.
In step 222, according to the test road conditions of the period of time for acquiring the acceleration signals, the acceleration signal corresponding to each road condition is determined. In some embodiments, the preprocessed acceleration signal may be segmented according to the test road conditions to obtain each road section L i Acceleration-time data of (a) is provided.
In step 223, according to the acceleration signal corresponding to each road condition, the impact response spectrum g corresponding to the road condition is determined by constructing the simulation environment i And fatigue damage spectrum d corresponding to road condition i Wherein i is a road condition identifier.
In some embodiments, the SRS and the FDS under each road condition are calculated by setting up a program in nCode software, so that the implementation difficulty is reduced, and the efficiency of test spectrum synthesis is improved.
In step 231, the fatigue damage spectrum d corresponding to the road condition obtained above i On the basis of the method, the fatigue damage spectrum D of the whole life cycle is determined by obtaining the weighted sum of the fatigue damage spectrums corresponding to the road conditions under different road conditions.
In some embodiments, the fatigue damage spectrum D for the full life cycle can be calculated in nCode software based on equation (1).
D＝k 1 d 1 +k 2 d 2 +…k i d i +…+k n d n ＝∑k i d i (1)
k i Represents the circulation times under road condition i, and n is the road condition quantity.
In step 232, the impact response spectrum g corresponding to the road condition obtained above i On the basis of the above, the maximum value of the impact response spectrum corresponding to the road condition under different road conditions is obtained, and the impact response envelope spectrum G of the whole life cycle is determined.
In some embodiments, the full life cycle impulse response envelope spectrum G is calculated in nCode software according to equation (2):
G＝Max{g 1 ,g 2 ,…g i …g n } (2)
wherein i is road condition identification, and n is road condition quantity.
In step 241, a vibration bench test spectrum is constructed from the fatigue damage spectrum of the damage equivalence and the full life cycle. In some embodiments, a vibration bench test spectrum (a random PSD spectrum or a sinusoidal sweep signal) equivalent to the fatigue damage spectrum D is synthesized from the damage equivalents.
In step 242, a limit response spectrum analysis is performed on the vibration bench test spectrum, and a limit response spectrum E is obtained.
In step 243, the limit response spectrum is compared with the full life cycle impulse response envelope spectrum to determine whether the limit response spectrum E is within the full life cycle impulse response envelope spectrum G. If E is within G, go to step 245; if E exceeds G, then step 244 is performed.
In step 244, the test time T of the test stand is adjusted, and the process returns to step 241. In some embodiments, the manner and size of adjustment may be empirically tried and adjusted.
In step 245, a flow is set up in nCode software to complete the output of the test spectrum.
In some embodiments, through testing, a bench accelerated fatigue test (taking a mud guard support as an example) is performed on a laboratory bench by using the vibration fatigue acceleration test spectrum compiled by the present disclosure, and after 421 hours of test, the mud guard support breaks, and the test ends; the fracture position of the test mud guard support is consistent with actual user feedback, and the accuracy and the reference value of the method are proved. If the real vehicle is used for road test in a professional comprehensive test field, the fatigue failure time of the mud guard needs about 8674.6 hours, so that the test is carried out in a laboratory by adopting the method disclosed by the disclosure, and the bracket verification time is greatly shortened.
Based on the method in the embodiment shown above, the accuracy of the excitation signal is ensured based on the actual measurement data of the road of the test field; creating a test spectrum PSD or sine sweep frequency signal equivalent to the actual fatigue damage for the vibration fatigue test bed; the generation of a vibration fatigue acceleration test spectrum of the bracket structure with multiple excitation points and multidirectional loads can be realized; the test spectrum is ensured not to exceed the actual vibration level, so that the reference value is improved; the vibration fatigue of the bracket structure is accelerated based on the fatigue damage equivalent theory, so that the consistency of the vibration bench test and the actual road test damage is ensured, and the structural fatigue damage assessment precision is improved; the test spectrum is strengthened and accelerated, and the test period is shortened; the calculation flow of the synthesized test spectrum is mainly realized based on nCode software, and the calculation method can be programmed and modularized, so that the realization difficulty is reduced, and the efficiency of synthesizing the test spectrum is improved.
A schematic diagram of some embodiments of the fatigue acceleration test spectrum generating device of the present disclosure is shown in fig. 3.
The acceleration signal acquiring unit 31 can acquire an acceleration signal acquired in the real lane road test process, where the acceleration signal includes a correspondence relationship between acceleration data and time. In some embodiments, an acceleration sensor may be installed at a frame excitation point where an automobile bracket of a vehicle is connected with a frame in advance, and real-time sensor detection data, which is real-time acceleration data, that is, acceleration-time number, is collected through a real-vehicle road test as an acceleration signal. In some embodiments, the excitation point is at the location of a frame excitation component that connects the automotive bracket to the frame. In some embodiments, the number of excitation points may be multiple, and the acceleration sensors are deployed separately, so as to realize data acquisition of multiple positions at a time. In some embodiments, the real vehicle road test can be performed under real user typical road conditions or standard test field conditions, and the acceleration-time information is obtained through repeated tests. In some embodiments, the test road includes multiple road conditions, thereby improving the comprehensiveness of the data acquisition.
In some embodiments, the acceleration signal acquisition unit 31 has a wired or wireless data transmission interface, capable of receiving detection data of the acceleration sensor.
The acceleration signal processing unit 32 can obtain SRS corresponding to road conditions and FDS corresponding to road conditions according to the acceleration signal. In some embodiments, the acceleration signal processing unit 32 may determine the acceleration signal corresponding to each road condition according to the road condition corresponding to the acceleration signal; and further, according to the acceleration signal corresponding to each road condition, determining SRS corresponding to the road condition and FDS corresponding to the road condition by constructing a simulation environment.
In some embodiments, the acceleration signal processing unit 32 first pre-processes the acceleration signal to eliminate the interference signal, and obtains an acceleration pre-processing signal, so as to obtain an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration pre-processing signal, so that the accuracy and the authenticity of the data can be prevented from being affected by the interference factors, and the accuracy of the fatigue acceleration test spectrum can be improved.
In some embodiments, preprocessing mainly includes smoothing the original signal, such as low-pass filtering, and detecting abnormal signals, such as deburring, data slicing, removing trend terms, and the like, so as to improve data reliability. In some embodiments, the preprocessing further includes analyzing the acceleration signal in the time domain and the frequency domain to obtain SRS and FDS based on the analysis result.
In some embodiments, after the acceleration signal processing unit 32 obtains the acceleration pre-processing signals, the acceleration pre-processing signals are split according to the road conditions corresponding to the acceleration signals, and the acceleration pre-processing signals corresponding to each road condition are determined; and further, according to the acceleration preprocessing signals corresponding to each road condition, determining SRS corresponding to the road condition and FDS corresponding to the road condition by constructing a simulation environment.
In some embodiments, the acceleration signal processing unit 32 may build a simulation environment in nCode software. Calculating impact response spectrum g under different road segment working conditions by constructing a flow chart in nCode software i And fatigue damage spectrum d i Where i represents different road segment conditions.
The full life data acquisition unit 33 is capable of determining an impact response envelope spectrum of the full life cycle and a fatigue damage spectrum of the full life cycle from the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition. In some embodiments, the full life data acquisition unit 33 determines the full life cycle impulse response envelope spectrum by acquiring the maximum of the impulse response spectrum corresponding to the road condition under different road conditions.
In some embodiments, the fatigue damage spectrum of the full life cycle is determined by obtaining a weighted sum of fatigue damage spectra corresponding to road conditions under different road conditions, and in some embodiments, the weight is the number of cycles corresponding to road conditions.
In some embodiments, the full life data acquisition unit 33 extrapolates the limited measured acceleration signal to a target mileage, i.e., a mileage within the full life cycle, calculates the number of cycles after the mileage extrapolation for different road segment conditions, using k i And the cycle times of the working conditions of each road section after the actual measurement signal mileage extrapolation are represented, and an impact response envelope spectrum G and a fatigue total damage spectrum D of the whole life cycle are further calculated.
The test spectrum generating unit 34 can construct a vibration bench test spectrum from the fatigue damage spectrum of the damage equivalent and the full life cycle. Further, the test spectrum generating unit 34 acquires a fatigue acceleration test spectrum by performing a limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the full life cycle.
In some embodiments, the test spectrum generating unit 34 acquires the limit response spectrum by performing limit response spectrum analysis on the vibration bench test spectrum after acquiring the vibration bench test spectrum; further, comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bench until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle, so as to obtain the fatigue acceleration test spectrum.
In some embodiments, a process is built in nCode software to finish the output of a vibration fatigue acceleration test spectrum (a random PSD spectrum or a sinusoidal sweep frequency signal), and the calculation method can be programmed and modularized, so that the implementation difficulty is reduced, and the efficiency of test spectrum synthesis is improved.
Based on the method in the embodiment shown above, the accuracy of the excitation signal can be ensured based on the road measured data of the test field, a test spectrum equivalent to the actual fatigue damage is created for the vibration fatigue test bed, the test spectrum is ensured not to exceed the actual vibration level, the vibration fatigue of the bracket structure is accelerated based on the fatigue damage equivalent theory, the consistency of the vibration bench test and the actual road test damage is ensured, and the precision of structural fatigue damage assessment is improved.
A schematic structural diagram of one embodiment of the fatigue acceleration test spectrum generating device of the present disclosure is shown in fig. 4. The fatigue acceleration test spectrum generating device comprises a memory 401 and a processor 402. Wherein: memory 401 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used to store instructions in the corresponding embodiment of the fatigue acceleration test spectrum generation method hereinabove. Processor 402 is coupled to memory 401 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 402 is configured to execute instructions stored in a memory to improve the accuracy of fatigue damage assessment of a vehicle structure.
In one embodiment, as also shown in FIG. 5, the fatigue acceleration test spectrum generating device 500 includes a memory 501 and a processor 502. The processor 502 is coupled to the memory 501 via a BUS 503. The fatigue acceleration test spectrum generating device 500 may also be connected to an external storage device 505 via a storage interface 504 for invoking external data, and may also be connected to a network or another computer system (not shown) via a network interface 506. And will not be described in detail herein.
In this embodiment, the accuracy of the fatigue damage assessment of the vehicle structure can be improved by storing the data instructions in the memory and processing the instructions by the processor.
In another embodiment, a computer readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of the corresponding embodiment of the fatigue acceleration test spectrum generation method. It will be apparent to those skilled in the art that embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present disclosure may also be implemented as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are merely for illustrating the technical solution of the present disclosure and are not limiting thereof; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will appreciate that: modifications may be made to the specific embodiments of the disclosure or equivalents may be substituted for part of the technical features; without departing from the spirit of the technical solutions of the present disclosure, it should be covered in the scope of the technical solutions claimed in the present disclosure.
Claims (14)
1. A fatigue acceleration test spectrum generation method, comprising:
acquiring acceleration signals acquired in a real lane road test process;
according to the acceleration signal, obtaining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition;
determining an impact response envelope spectrum of the whole life cycle and a fatigue damage spectrum of the whole life cycle according to the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition;
and constructing a vibration bench test spectrum according to the damage equivalence and the fatigue damage spectrum of the whole life cycle, and obtaining a fatigue acceleration test spectrum by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle.
2. The method of claim 1, wherein the obtaining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition from the acceleration signal comprises:
preprocessing the acceleration signal to eliminate an interference signal and obtain an acceleration preprocessing signal;
and acquiring an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration preprocessing signal.
3. The method according to claim 1 or 2, wherein the acquiring an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition includes:
determining an acceleration signal corresponding to each road condition according to the test road condition of the period of acquiring the acceleration signal;
according to the acceleration signals corresponding to each road condition, determining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition by constructing a simulation environment.
4. The method of claim 1 or 2, wherein the determining the full life cycle impact response envelope spectrum and the full life cycle fatigue damage spectrum from the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition comprises:
determining the impact response envelope spectrum of the whole life cycle by acquiring the maximum value of the impact response spectrum corresponding to the road condition under different road conditions;
and determining the fatigue damage spectrum of the whole life cycle by acquiring the weighted sum of the fatigue damage spectrums corresponding to the road conditions under different road conditions.
5. The method of claim 1 or 2, wherein the acquiring a fatigue acceleration test spectrum by performing a limit response analysis on the vibration bench test spectrum according to the full life cycle impact response envelope spectrum comprises:
carrying out limit response spectrum analysis on the vibration bench experimental spectrum to obtain a limit response spectrum;
and comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bench until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle, so as to obtain the fatigue acceleration test spectrum.
6. The method of claim 1 or 2, wherein the acquiring acceleration signals acquired during a real-lane road test comprises:
in the real-lane road test process, acceleration data detected by acceleration sensors arranged at a plurality of frame excitation points connected with an automobile bracket and a frame are obtained, wherein the acceleration signals comprise corresponding relations between the acceleration data and time.
7. A fatigue acceleration test spectrum generating device, comprising:
the acceleration signal acquisition unit is configured to acquire acceleration signals acquired in the real lane road test process;
the acceleration signal processing unit is configured to acquire an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration signal;
a full life data acquisition unit configured to determine an impact response envelope spectrum of a full life cycle and a fatigue damage spectrum of the full life cycle according to the impact response spectrum corresponding to the road condition and the fatigue damage spectrum corresponding to the road condition;
and the test spectrum generating unit is configured to construct a vibration bench test spectrum according to the damage equivalence and the fatigue damage spectrum of the whole life cycle, and obtain a fatigue acceleration test spectrum by carrying out limit response analysis on the vibration bench test spectrum according to the impact response envelope spectrum of the whole life cycle.
8. The apparatus of claim 7, wherein the acceleration signal processing unit is configured to:
preprocessing the acceleration signal to eliminate an interference signal and obtain an acceleration preprocessing signal;
and acquiring an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition according to the acceleration preprocessing signal.
9. The apparatus according to claim 7 or 8, wherein the acceleration signal processing unit is configured to include:
determining an acceleration signal corresponding to each road condition according to the test road condition of the period of acquiring the acceleration signal;
according to the acceleration signals corresponding to each road condition, determining an impact response spectrum corresponding to the road condition and a fatigue damage spectrum corresponding to the road condition by constructing a simulation environment.
10. The apparatus according to claim 7 or 8, wherein the full life data acquisition unit is configured to:
determining the impact response envelope spectrum of the whole life cycle by acquiring the maximum value of the impact response spectrum corresponding to the road condition under different road conditions;
and determining the fatigue damage spectrum of the whole life cycle by acquiring the weighted sum of the fatigue damage spectrums corresponding to the road conditions under different road conditions.
11. The apparatus according to claim 7 or 8, wherein the trial spectrum generation unit is configured to:
carrying out limit response spectrum analysis on the vibration bench experimental spectrum to obtain a limit response spectrum;
and comparing the limit response spectrum with the impact response envelope spectrum of the whole life cycle, and adjusting the test time of the test bench until the limit response spectrum is within the impact response envelope spectrum of the whole life cycle, so as to obtain the fatigue acceleration test spectrum.
12. The apparatus according to claim 7 or 8, wherein the acceleration signal acquisition unit is configured to acquire acceleration data detected by acceleration sensors installed at a plurality of frame excitation points where the automobile bracket is connected to the frame during a real-road test, wherein the acceleration signal includes a correspondence relationship between the acceleration data and time.
13. A fatigue acceleration test spectrum generating device, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-6 based on instructions stored in the memory.
14. A non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any of claims 1 to 6.
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