CN116256134A - Vehicle vibration testing device system - Google Patents
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Abstract
The invention relates to the field of vehicle vibration test and active control, in particular to a vehicle vibration test device system which comprises a microcomputer processing part, a rack base, a motion mechanism, a control mechanism, an electric hydraulic cylinder part, a hydraulic cylinder supporting part, a vibration isolation part, a displacement sensor, an auxiliary device and an active control system, wherein the rack base comprises an upper rack, a middle rack and a lower rack, the bottom of the lower rack is arranged on the horizontal ground, the active control system adopts frequency iteration control to simulate the vehicle motion test vibration condition, and cab vibration signals can be measured by a multi-scale arrangement entropy method, so that a tested cab is optimized, the sensitive vibration characteristics of a human body are avoided, the riding comfort is further improved, the riding comfort and smoothness are improved, and the vehicle vibration test device is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the field of vehicle vibration testing and active control, in particular to a vehicle vibration testing device system.
Background
At present, along with the continuous improvement of the living standard of people, the requirements of people on the riding comfort of vehicles are higher and higher, and good vehicle smoothness can bring a comfortable riding environment for riding personnel, so that riding fatigue is not easy to generate, meanwhile, the running is safer, the dynamic performance of the vehicle can be fully exerted, on the contrary, a vehicle with poor riding comfort can generate larger vibration impact in running, not only can accelerate the wearing and aging of vehicle parts, reduce the reliability and service life of the vehicle, but also can cause the riding personnel to generate larger uncomfortable feeling, and seriously influence the normal driving of the driver. In general, in the development process of passenger cars, the test of the durability of the whole car is required for all the sample cars in each development stage, the test of the durability of the whole car is generally verified through the road test of a test field, the whole test period is long, the manpower input is high, and in order to improve the passing rate of products in the road test of the whole car of the test field, the simulation durability test of the road of the whole car is required to be increased in the development test process.
The existing vehicle vibration testing device mechanisms can be divided into: the vehicle vibration testing device system comprises a single-degree-of-freedom testing device, a few-degree-of-freedom testing device and a six-degree-of-freedom testing device, wherein the single-degree-of-freedom testing device and the few-degree-of-freedom testing device are different in the actual driving process of a simulated vehicle, the six-degree-of-freedom testing device has a complex control structure, the testing device has a certain limitation, the combination of a vibration test and a testing method is rarely proposed, and in view of the background, the defects, a vehicle vibration testing device system is provided for solving the problems, and the device system can generate control force in real time according to the excitation condition to slow down vibration so as to improve smoothness and comfort.
Disclosure of Invention
The invention aims to provide a vehicle vibration testing device system which can solve the problems of precision errors, complex six-degree-of-freedom control structure and vibration testing of a whole vehicle and parts in a less-degree-of-freedom testing device in a specific use process, and realizes the combination of the testing device and the testing method and the accurate realization of the reproduction of the motion condition of a vehicle by a vibration testing platform device.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a vehicle vibration testing arrangement system, includes, microcomputer processing part, rack base, motion, control mechanism, electric hydraulic cylinder part, pneumatic cylinder supporting part, vibration isolation part, displacement sensor, auxiliary device and initiative control system, the rack base include upper rack, well rack, lower rack, the bottom of lower rack is arranged on horizontal ground, installs the vibration isolation part that plays isolated vibrations in the upper portion of lower rack, installs well rack in the upper portion of vibration isolation part, electric hydraulic cylinder part and pneumatic cylinder supporting part are installed in the upper position of well rack, have arranged upper rack in the upper portion of pneumatic cylinder supporting part, test vehicle places the upper portion at upper rack, has installed displacement sensor on the pneumatic cylinder supporting part, has installed initiative control system on test vehicle and rack base's outside.
The active control system comprises a signal acquisition module, a middle end control module and an implementation end module, wherein the signal acquisition module and the middle end control module are both arranged on a test vehicle, the implementation end module is arranged on the outer side of a rack base, and the upper part of the middle end control module is connected with the lower part of the signal acquisition module; the signal acquisition module can acquire real-time vibration signals and output the acquired signals to the middle-end control module after processing and analyzing the acquired signals, and the middle-end control module controls motion characteristics according to the signals.
The microcomputer processing part comprises a power supply, a data memory and a signal processing module, wherein the power supply is arranged at the bottom of the microcomputer processing part, the data memory is arranged at one side part of the power supply, the signal processing module is arranged at one side part of the data memory, the signal processing module comprises an ECU processor and an RC low-pass filter, the ECU processor carries out real-time correction control on a motion displacement signal of the hydraulic cylinder and carries out SVD (singular value) and MPE (entropy method) processing on a collected vibration acceleration signal, and the RC low-pass filter is used for removing redundant high-frequency interference signals.
The signal acquisition module comprises a piezoelectric acceleration sensor and a vibration sensor, wherein the piezoelectric acceleration sensor is used for acquiring acceleration signals in the running process of the vehicle, and the vibration sensor is used for acquiring vibration signals in the running process of the vehicle.
The actuator is used for generating forces in vertical, rolling and pitching directions according to signals from the middle-end control module, the actuator is used for counteracting excitation from a road surface, and the actuator is used for generating feedback signals and transmitting the feedback signals to the signal processing module for further analysis of regulation signals.
The displacement sensor is used for collecting the information of the actual motion quantity of the hydraulic rod in the hydraulic cylinder, and feeding the collected information back to the microcomputer processing part in real time so as to adjust output parameters and control the motion of the upper rack, and the signal collecting module is used for collecting the acceleration vibration signals of the vehicle on the upper rack, and meanwhile, the two signals are not mutually interfered, and the former signal is used for laying a mat for the latter signal.
The initial position of pneumatic cylinder be 90 degrees with horizontal plane vertically, electric pneumatic cylinder concentrated arrangement install in middle rack middle part position and link to each pneumatic cylinder through the hydraulic line, the pneumatic cylinder parallel arrangement, the upper portion of pneumatic cylinder links to each other with last rack through the hook hinge, the lower part of pneumatic cylinder is movable rotatable hinged joint structure, has arranged the sensor on every electric pneumatic cylinder.
The test vehicle is arranged on the upper bench, vibration measuring sensors are respectively arranged at the seat surface, the seat backrest and the right lower part of the seat of the cab of the tested vehicle, and can detect vibration acceleration signals at the seat surface, the seat backrest and the right lower part of the seat.
The vibration isolation part at the upper part of the lower bench base is cylindrical in shape, and is made of rubber.
Further, an auxiliary device is arranged at the upper part of the lower rack, the auxiliary device can slide on the lower rack along the lateral direction of the rack, and the auxiliary device is a telescopic movable device.
The beneficial effects of the invention are as follows: the vehicle vibration testing device system is scientific in overall structure design and convenient to operate and use, the hydraulic cylinders are arranged between the upper base of the rack and the middle base of the rack and can keep a certain direction of thrust for the upper base of the rack, the hydraulic cylinders move along with the movement of the upper base of the rack, each hydraulic cylinder is provided with a displacement sensor for collecting movement quantity signals and transmitting data to the microcomputer processing part for processing, meanwhile, the vehicle vibration testing device system can keep the stability of a moving platform, has a larger lifting force, increases the bearing capacity of the upper rack, and is provided with the sensors at accessories of the hydraulic cylinders, the microcomputer processing part can transmit the signals to the control mechanism more accurately, rapidly and accurately, and further, the movement of the whole platform is controlled better.
Drawings
FIG. 1 is an overall layout of a vehicle vibration testing apparatus system of the present invention;
FIG. 2 is a control schematic of the active control system of the present invention;
FIG. 3 is a schematic diagram of the control architecture of the active control system of the present invention;
FIG. 4 is a flow chart of an application of the vehicle vibration testing apparatus system of the present invention;
FIG. 5 is a fuzzy control map of the vehicle vibration test apparatus system of the present invention;
FIG. 6 is an exploded schematic view of the end control of the vehicle vibration testing apparatus system of the present invention;
FIG. 7 is a flowchart of the control steps of the vehicle vibration testing apparatus system of the present invention;
FIG. 8 is a flow chart of the FBF simulation control of the vehicle vibration testing apparatus system of the present invention;
FIG. 9 is an iterative flow chart of the vehicle vibration testing apparatus system of the present invention;
reference numerals illustrate: 01. a microcomputer processing section; 01-1, a power supply; 01-2, a data memory; 01-3, an ECU processing module; 01-31, an ECU processor; 01-32, RC low pass filter; 02-testing the vehicle; 03. a gantry base; 03-1, a pedestal on the bench; 03-2, a base in a rack; 03-3, a lower base of the bench; 04. a movement mechanism; 05. a control mechanism; 06. an electro-hydraulic cylinder section; 07. a hydraulic cylinder; 08. a vibration isolation portion; 09. a displacement sensor; 10. an auxiliary device; 11. a signal acquisition module; 11-1, an acceleration sensor; 11-2, a vibration sensor; 12. a middle-end processing module; 12-1, a fuzzy controller; 12-2, a low pass filter; 13. an implementation end; 13-1, an actuator; 13-2, detection sensor.
Detailed Description
Specific example 1: the technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that: in the present invention, all embodiments and preferred methods of implementation mentioned herein may be combined with each other to form new solutions, unless otherwise specified. In the present invention, all technical features mentioned herein and preferred features may be combined with each other to form new technical solutions, unless otherwise specified. The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits and one or more upper limits, respectively. Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present invention.
As shown in fig. 1 to 9 of the specification of the present invention, a vehicle vibration testing device system of the present invention comprises a microcomputer processing section 01, a rack base 03, a movement mechanism 04, a control mechanism 05, an electric hydraulic cylinder section 06, a hydraulic cylinder supporting section 07, a vibration isolation section 08, a displacement sensor 09, an auxiliary device 10 and an active control system, wherein the rack base 03 comprises an upper rack 03-1, a middle rack 03-2 and a lower rack 03-3, the bottom of the lower rack 03-3 is arranged on a horizontal ground, the vibration isolation section 08 for isolating vibration is mounted on the upper part of the lower rack 03-3, the middle rack 03-2 is mounted on the upper part of the vibration isolation section 08, the electric hydraulic cylinder section 06 and the hydraulic cylinder supporting section 07 are mounted on the upper part of the middle rack 03-2, the upper rack 03-1 is arranged on the upper part of the hydraulic cylinder supporting section 07, the displacement sensor 09 is mounted on the hydraulic cylinder supporting section 07, and the active control system is mounted on the test vehicle and outside of the rack base 03. In the case that the motion mechanism 04 performs motion according to the signal from the control mechanism 05, the specific signal of the control module 05 is from the microcomputer processing part 01, the displacement sensor 09 continuously feeds back the motion signal to the microcomputer processing part 01, and the microcomputer processing part 01 updates the control signal in real time according to the feedback signal to control the motion track of the motion mechanism 04.
The active control system comprises a signal acquisition module 14, a signal processing module (ECU processor 01-3), a middle-end control module 12 and an implementation end 13, wherein the test device diagram, the active control diagram and the active control diagram are shown in the accompanying drawings 1-3. And the main and auxiliary correction signals are primarily collected by the signal collecting module 11 and transmitted to the signal processing module 01-3, the processed signals are transmitted to the middle-end control module 12 for adjustment, more accurate instructions are transmitted to the implementation end 13, the auxiliary feedback exists at the implementation end 13 to react to the output signals to the signal processing module 01-3 in real time, the main correction signals exist in the transmission middle-end control module 12, and the output signals are primarily corrected and perfected.
Further, the signal acquisition module 11 includes a vibration sensor 11-2, a piezoelectric acceleration sensor 11-1 and a data storage 01-2, the vibration sensor 11-2 acquires a vibration signal during the running process of the vehicle, the piezoelectric acceleration sensor 11-1 acquires an acceleration signal during the running process of the vehicle, the data storage 01-2 is used for storing data generated by the vibration sensor, the signal processing module 01-3 includes an ECU processor 01-31 and an RC low-pass filter 01-32, the ECU processor 01-31 is responsible for decomposing and simply processing the incoming signal, and the RC low-pass filter 01-32 is used for filtering high-frequency noise signals in the signal.
Further, the middle-end control module 12 includes a vehicle suspension system module fuzzy controller 12-1 (vertical vibration controller, pitching vibration controller, rolling vibration controller, logic controller) low-pass filter 12-2, the suspension module uses the vertical, rolling, pitching direction speed and acceleration at the center of mass of the cab as feedback control inputs to the signals from the ECU module, and obtains control outputs, namely several suspension active control forces F1, F2, F3, F4, etc., through operation rules, and the system adopts the fuzzy controller 12-1, and the execution module continuously executes and corrects under the vehicle suspension according to the signals.
Example 1
When the invention is implemented, the signal acquisition module 11 comprises two vibration signal sensors 11-2, at least one piezoelectric acceleration sensor 11-1 and a data memory 01-2; the signal processing module 01-3 comprises an ECU processor 01-31 and an RC low-pass filter 01-32; the middle-end control module 12 comprises a fuzzy controller 12-1, a power supply 01-1 and a low-pass filter 12-2, and performs accurate control by adopting a limited bandwidth fuzzy algorithm, and outputs signals to an implementation end, the implementation end 13 realizes a vehicle vibration active control system, the testing device realizes accurate simulation movement, a control mechanism is simplified, and comfortableness is improved.
As shown in the end control decomposition schematic diagram in fig. 6 of the specification, the low-pass filter 12-2 in the middle-end control module 12 is a second-order low-pass filter, because the filter 12-2 is connected with the signal processing module 01-3 on the middle-end control module 12 and is connected with the actuator 13-1 and the detection sensor 13-2 in the implementation-end 13 module, the working frequency of the actuator 13-1 of the active control implementation-end can be divided into a limited bandwidth and full active control, the limited bandwidth active control only works in a narrow-band frequency range, the system complexity is low, the control is more accurate, the main vibration frequency of the cab of the general vehicle is included, the limited bandwidth actuator with the working frequency of 0-6 Hz is selected, and the controller adopts the second-order low-pass filter, and the transfer function is as follows:
wherein: w (w) d =2pi f, f is the cut-off frequency, 6Hz is chosen; zeta type toy d For the output signal and input phase delay, 0.7 is set.In the vehicle vibration testing device and the active control system of the active control system thereof, the fuzzy controllers are designed in such a way that the fuzzy controllers comprise the steps of determining fuzzy input and output variables and the domains thereof, determining fuzzy output gain factors, formulating fuzzy control rules and determining fuzzification methods, and the three modes of controlling the degrees of freedom of vertical, rolling and pitching are required to be controlled, so that 3 fuzzy controllers are required to respectively and accurately control, and the fuzzy controllers are similar in the design process, so that only the vertical controllers are designed.
The vertical vibration fuzzy controller takes a vibration signal from the ECU processor 12-1 module as an input, and sets fuzzy linguistic variables of an input variable and an output variable to 7 levels of positive large (PB), positive small (PM), positive Small (PS), zero (ZE), negative Small (NS), negative Medium (NM), negative large (NB), etc. at a control force as an output. The membership functions of the input variable and the output variable are symmetrical, uniformly distributed and fully overlapped triangles. The relation between the input quantity and the output quantity of the controller determines the principle of fuzzy control, 49 fuzzy rules can be obtained, the Mandain method is adopted for fuzzy reasoning, each fuzzy rule represents one fuzzy relation, the total number of the fuzzy rules is 49, and R is used for carrying out fuzzy reasoning 1 The following is shown:
r through 49 fuzzy relations i The operation of (i=1, 2, … … 49) can result in a regular total ambiguity relationship R, namely: r=r 1 ∨R 2 ∨R 3 ∨……R 48 ∨R 49
And obtaining a fuzzy set U of the output language variable by utilizing an inference synthesis rule according to the calculated fuzzy relation, namely:
in order to accelerate calculation, a gravity center method is adopted for anti-blurring, and the calculation formula is as follows:
wherein: x is x i For each element of the output ambiguity set U (i=1, 2,3, n); mu u (x) i ) Is the element x i Membership degree of (3); u is the result obtained by the gravity center method;
secondly, selecting 3 gain factors of the fuzzy optimization controller as design variables k= [ k ] 1 k 2 k 3 ]And optimizing and designing gain coefficients of the 3 fuzzy controllers with the aim of improving the smoothness of the vehicle. The objective function is the root mean square value of the vertical, pitch and roll weighted acceleration at the center of mass of the cab, namely:
wherein:
the root mean square values of vertical, pitching and rolling accelerations respectively; omega α ,ω β ,ω λ For the root mean square weighting coefficients of vertical, pitching and rolling accelerations, the weighting coefficients of each direction are 1,0.40,0.63 respectively according to the ISO2631-1:1997 (E) standard. And then carrying out genetic iteration until the set parameters are met, and selecting the solution of the last generation as an approximate optimal solution. I.e. k= [96 26 42 ]]At the time, the approximate minimum value of the directional weighted acceleration is 0.38m/S 2 In this example the gantry means are controlled more accurately and conveniently.
Example 2
As shown in fig. 7 of the specification, in the vehicle vibration testing device system, in the implementation, input signals are collected to further determine a testing target signal of the testing device, a driving signal of the testing device system is generated through processing, the testing system is further driven, data are further transmitted to a microcomputer module 01, and further analysis, processing and vehicle vibration bench testing are completed.
As shown in the figure 8 of the specification, the specific implementation process of the vehicle vibration testing device system comprises the steps of firstly obtaining a frequency response function of the whole testing system through system identification, wherein the identification method is a non-parameter frequency response function model identification method, the selected identification excitation signal is usually powdery red noise, the response signal is usually an acceleration signal (namely an equivalent road surface spectrum) of each wheel axle head, and a system frequency response function matrix can be obtained through calculation;
wherein H (j omega) is a system frequency response function matrix; g yu (jω) a cross-power spectrum estimation matrix at frequency ω for the input and output; g uu (jω) is a self-power spectrum estimation matrix input at frequency ω.
As shown in FIG. 9, the specific implementation process steps of the cab vibration test method and device are that the test system always shows certain nonlinearity, so that gradually converging driving signals need to be obtained in an iterative mode, and response signals of all target points approach corresponding target signals. The invention adopts the iteration control method in the frequency domain to iterate the target signal, compares the acceleration signal of the target part with the acceleration signal acquired under the actual road running condition after carrying out iteration processing for a plurality of times, is quite close to the acceleration signal, controls the root mean square error after the iteration processing to be about 10%, and can judge that the input signal is close to the road load under the actual road running condition when the obtained root mean square error is controlled within 5%, and the input signal is used for carrying out the test of the vibration test of the cab, so that the influence of the road load under the actual road running condition on the vibration of the vehicle cab can be equivalent.
Further, a control driving signal is obtained through calculation according to the obtained frequency response function and a target spectrum to be loaded (usually a spindle head acceleration response spectrum or an equivalent road surface excitation spectrum), then the control driving signal is played, and the control driving signal is corrected in a frequency domain according to an error between an actually measured response signal and the target signal, so that a next control driving signal is obtained.
U new (jω)＝U old +ΔU(jω)
Wherein DeltaU (jω) is the update amount of the driving signal matrix in the iteration; e (jω) is the Fourier transform of the tracking error matrix E (t); u (U) old (jω)、U new (jω) are the Fourier transforms of the drive signal matrices before and after the update, respectively, by applying a method to U new (jω) performing inverse fourier transform to obtain a driving signal matrix for the next iteration; beta is a weighting coefficient (0 < beta < 1);
thus forming a loop iterative process. Finally, an iterated control driving signal can be obtained, so that the error between a system response signal and a target signal obtained by running the iterated control driving signal meets the corresponding precision requirement, and the evaluation index is usually a relative root mean square value error (for a whole vehicle road simulation test, the iterated control driving signal can be ended when each epsilon is less than 10 percent);
wherein e (t) is a tracking error; y is t (t) is the objective function and RMS { } is the root mean square planting of the signal. The motion trail of the platform simulated by the method, namely the road spectrum, is more true and reliable, and has more reference value.
Further, the signal acquisition module 11 and the displacement sensor 09 are installed near the motion mechanism, the signal acquisition part 11 needs to be installed at the positions below the cab, namely, the seat cushion, the seat back, the position under the seat and other measuring points are directly contacted with the human body, the vibration condition of the positions directly influences the riding comfort and the riding smoothness, so that the vibration condition of the positions is measured, the vibration condition is the most practical, the sensor is adopted as the vibration acceleration sensor 11-2, and in the real situation, the vibration signal is acquired by the sensor for acquiring the signal, and other factors influence can exist, and the analysis signal can be processed by an entropy method for the influence acquisition factors.
Further, the signal processing module adopts a method that the essence of singular value decomposition (Singular Value Decomposition SVD) is that actually measured signals are subjected to orthogonal transformation, so that the method has a good filtering effect on high-frequency random noise in the signals, and matrix singular values obtained by an SVD method have the characteristics of uniqueness, stability, proportion invariance and the like, and the transformation relation is as follows:
H＝USV T
wherein: u and V are the transformed orthogonal matrices; s is a singular value matrix.
Furthermore, the method adopted by the signal processing module is that a multi-scale permutation entropy (Multiscale Permutation Entropy, MPE) is adopted to put forward on the basis of a multi-scale algorithm, and is also a product of combining the multi-scale algorithm and the permutation entropy algorithm (Permutation Entropy), and the PE calculates the calculation relation as follows
Wherein: m is the embedding dimension of the time series; τ is the delay time; t (ω) is the relative frequency of occurrence of any one of the arrangements ω; n is the scale of the original time series. The lower the sequence complexity, the smaller the permutation entropy value; conversely, the greater the permutation entropy value. The PE can amplify the fine fluctuation in the signal by using the change of the sequence arrangement mode so as to reflect the abnormal condition in the signal;
the calculation essence of the MPE method is a processing mode of sequentially coarsening an original time sequence, so that a new time sequence is constructed, coarse-grained processing is carried out on a group of original time sequences, and the average value calculation relational expression of the newly constructed time sequences can be obtained:
wherein: lambda is the scale factor.
Further, the microcomputer processing section 01, the measured test signal, has been affected by various interference signals such as signal interference of the electromagnetic itself, other generated noise, etc., seriously affecting the purity of the vibration analysis signal. Meanwhile, on the whole time sequence, the vibration characteristics among the vibration signals have complex multi-scale coupling phenomenon, so that the difficulty in extracting and analyzing the vibration characteristics of the cab body is greatly increased.
Further, the signal processing module 01-3 performs noise reduction processing on the measured vibration signal according to the SVD principle. After filtering out interference signals such as noise, the vibration phase space matrix is reconstructed by utilizing the inverse operation of SVD, and the matrix is the optimal approximation matrix of the vibration signal after noise reduction. Singular values of vibration under different working conditions can be found through SVD, so R singular values before a peak value are selected to reconstruct a vibration signal. In order to accurately describe the change rule of the singular value sequence, the singular value sequence is subjected to differential spectrum calculation, and the maximum value of the singular value differential spectrum sequence is found out.
Further, the signal processing module 01-3 performs MPE analysis on the noise-reduced signal to obtain the distribution situation of entropy values in the X, Y and Z directions of the seat, so that the distribution rule can be more clearly known. So as to provide data for subsequent optimization and perfectly avoid the range of the frequency response characteristic sensitive interval of the human body.
The vehicle vibration testing device system solves the problems of precision errors, complex six-degree-of-freedom control structure, complete vehicle and part vibration testing in a less-degree-of-freedom device, has the advantages and characteristics of rapid, convenient and quick testing process and the like, and is easier to understand by those skilled in the art, so that the protection scope of the invention is more clearly and definitely defined.
The implementation process of the specific functions of the invention is as follows:
the sensor signal acquisition module is arranged on the motion mechanism and in the cab of the tested vehicle, the real road spectrum condition is simulated by adopting a frequency iteration control method according to the basic structure of the testing device, then the vibration data can be accurately and rapidly analyzed and processed by adopting an entropy value method (SVD and MPE), the problems of precision errors, complex six-degree-of-freedom control structure, complete vehicle and part vibration testing in the less-degree-of-freedom device are solved by adopting the combination of the testing device and the testing method, the testing process is rapid, the testing data is accurate, the control mechanism is simple, the vehicle vibration state can be accurately reproduced, and therefore the time and cost of vehicle vibration optimization data are saved. The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. The vehicle vibration testing device system is characterized by comprising a microcomputer processing part (01), a bench base (03), a moving mechanism (04), a control mechanism (05), an electric hydraulic cylinder part (06), a hydraulic cylinder supporting part (07), a vibration isolation part (08), a displacement sensor (09), an auxiliary device (10) and an active control system, wherein the bench base (03) comprises an upper bench (03-1), a middle bench (03-2) and a lower bench (03-3), the bottom of the lower bench (03-3) is arranged on the horizontal ground, a vibration isolation part (08) for isolating vibration is arranged on the upper part of the lower bench (03-3), the middle bench (03-2) is arranged on the upper part of the vibration isolation part (08), the electric hydraulic cylinder part (06) and the hydraulic cylinder supporting part (07) are arranged on the upper part of the middle bench (03-2), the upper bench (03-1) is arranged on the upper part of the hydraulic cylinder supporting part (07), the test vehicle is placed on the upper part of the upper bench (03-1), the vibration isolation part is arranged on the upper part of the lower bench (03-3), the vibration isolation part is arranged on the upper part of the hydraulic cylinder supporting part (07), and the displacement sensor (09) is arranged on the outer side of the vehicle.
2. The vehicle vibration testing device system according to claim 1, wherein the active control system comprises a signal acquisition module (11), a middle end control module (12) and an implementation end module (13), wherein the signal acquisition module (11) and the middle end control module (12) are both installed on a tested vehicle, the implementation end module (13) is installed and arranged on the outer side of a rack base (03), and the upper part of the middle end control module (12) is connected with the lower part of the signal acquisition module (11) and the implementation module (13); the signal acquisition module (11) can acquire real-time vibration signals and output the acquired signals to the middle-end control module (12) after processing and analyzing, and the middle-end control module (12) controls motion characteristics according to the signals.
3. The vehicle vibration testing device system according to claim 1, wherein the microcomputer processing part (01) comprises a power supply (01-1), a data memory (01-2) and a signal processing module (01-3), the power supply (01-1) is arranged at the bottom of the microcomputer processing part (01), the data memory (01-2) is arranged at one side part of the power supply (01-1), the signal processing module (01-3) is arranged at one side part of the data memory (01-2), the signal processing module (01-3) comprises an ECU processor (01-31) and an RC low-pass filter (01-32), the ECU processor (01-31) carries out real-time correction control on a motion displacement signal of the hydraulic cylinder (07) and carries out SVD and MPE processing on the acquired vibration acceleration signal, and the RC low-pass filter (01-32) is used for removing redundant high-frequency interference signals.
4. The vehicle vibration testing device system according to claim 2, wherein the signal acquisition module (11) comprises a piezoelectric acceleration sensor (11-1) and a vibration sensor (11-2), the piezoelectric acceleration sensor (11-1) is used for acquiring acceleration signals during vehicle running, and the vibration sensor (11-2) is used for acquiring vibration signals during vehicle running.
5. A vehicle vibration testing apparatus system according to claim 3, wherein, the actuator implementation end (13) can generate forces in vertical, rolling and pitching directions by the operation of the actuator implementation end (13) according to the signals from the middle end control module (12), for counteracting the excitation from the road surface, while the application terminal (13) can generate and transmit a feedback signal to the signal processing module (01-3) for further analysis of the regulation signal.
6. A vehicle vibration testing apparatus system according to claim 3, wherein the displacement sensor (09) is adapted to collect information on the actual movement amount of the hydraulic rod in the hydraulic cylinder (07) and feed back the collected information to the microcomputer processing section (01) in real time so as to adjust the output parameters, control the movement of the upper stage (03-1), and the signal collecting module (11) is adapted to collect the vehicle acceleration vibration signal on the upper stage (03-1) while the two signals do not interfere with each other, the former signal being the latter signal.
7. The vehicle vibration testing device system according to claim 1, wherein the initial position of the hydraulic cylinders (07) is 90 degrees vertical to the horizontal plane, the electric hydraulic cylinders (06) are arranged in a concentrated manner and are connected with the hydraulic cylinders (07) through hydraulic circuits, the hydraulic cylinders (07) are arranged in parallel, the upper parts of the hydraulic cylinders (07) are connected with the upper rack (03-1) through hook hinges, the lower parts of the hydraulic cylinders (07) are movably and rotatably hinged structures, and a sensor is arranged on each electric hydraulic cylinder (06).
8. The vehicle vibration testing device system according to claim 1, wherein the test vehicle (02) is arranged on the upper bench (03-1), and sensors are respectively arranged at the seat surface, the seat back and the right under the seat of the cab seat of the vehicle to be tested, and the sensors can detect vibration acceleration signals at the seat surface, the seat back and the right under the seat.
9. The vehicle vibration testing apparatus system according to claim 1, wherein the vibration isolation portion (08) of the upper portion of the lower stage base has a cylindrical shape, and the vibration isolation portion (08) is made of rubber.
10. A vehicle vibration testing apparatus system according to claim 1, further characterized in that an auxiliary device (10) is mounted on the upper part of the lower carriage (03-3), said auxiliary device (10) being slidable laterally along the carriage on the lower carriage (03-3), the auxiliary device (10) being a telescopically movable device.
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| CN202310030014.7A CN116256134B (en) | 2023-01-09 | Vehicle vibration testing device system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310030014.7A CN116256134B (en) | 2023-01-09 | Vehicle vibration testing device system |
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