Engine vibration boundary condition calibration test bench and calibration method

Abstract

The invention relates to an engine vibration boundary condition calibration test bed and a test method, and belongs to the technical field of vehicle testing. According to the technical scheme, the engine vibration boundary condition calibration test bed comprises a simulation suspension used for installing an engine to be calibrated; the vibration excitation device comprises a Z-direction vibration exciter located at the bottom of the simulation suspension, a Y-direction vibration exciter located on one side or two sides of the simulation suspension in the vehicle driving direction, and an X-direction vibration exciter located on the front side and / or the rear side of the simulation suspension in the vehicle driving direction; a plurality of acceleration sensors which are installed on the simulation suspension and are used for collecting acceleration signals of the simulation suspension; and the data processing module is used for collecting and processing acceleration signals of the plurality of acceleration sensors. The scheme has the beneficial effects that the vibration environment of the engine in actual work can be accurately simulated, a reliable basis is provided for vibration calibration, and the calibration efficiency and the data accuracy are improved at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle testing, and in particular to an engine vibration boundary condition calibration test bench and an engine vibration boundary condition calibration method. Background Art

[0002] Engine vibration is an inevitable physical phenomenon during engine operation. It is mainly caused by the interaction of various forces inside the engine. This vibration may have an adverse effect on the performance and service life of the engine and the ride comfort of the vehicle. The causes of engine vibration are various, including pressure fluctuations caused by uneven combustion of fuel in the combustion chamber, mechanical imbalance of rotating parts, inertia force of reciprocating parts, fluctuation of output torque, looseness of supporting structure and poor gear meshing.

[0003] The types of vibration can be divided into free vibration, forced vibration and resonance. The resonance phenomenon will cause the vibration amplitude to increase sharply at a specific frequency. The impact of engine vibration is mainly reflected in increased noise, accelerated component wear, reduced performance and affected ride comfort. In order to control engine vibration, balance adjustment, vibration isolation measures, dynamic balance treatment and optimized design can be adopted. Through in-depth understanding and effective control of engine vibration, the overall performance and reliability of the engine can be significantly improved, ensuring the safe and comfortable operation of the vehicle.

[0004] Engine vibration is one of the important factors that affect its performance and service life. In the process of engine design, development and optimization, accurate calibration of engine vibration boundary conditions is of great significance to ensure stable operation of the engine, reduce vibration noise and increase service life. However, traditional engine vibration boundary condition calibration methods often have problems such as low calibration accuracy and complex operation. Summary of the invention

[0005] Aiming at the problems of low calibration accuracy and complicated operation of engine vibration dynamic boundary conditions at present, the present invention provides an engine vibration boundary conditions calibration test bench.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: an engine vibration boundary condition calibration test bench, including: a simulated frame for installing the engine to be calibrated; an excitation device, including a Z-direction exciter located at the bottom of the simulated suspension, a Y-direction exciter located on one side or both sides of the simulated suspension along the vehicle's driving direction, and an X-direction exciter located at the front and / or rear side of the simulated suspension along the vehicle's driving direction; a plurality of acceleration sensors installed at the suspension where the simulated frame is connected to the engine, for collecting the acceleration signal of the suspension; a data processing module for collecting and processing the acceleration signals of the plurality of acceleration sensors. The beneficial effect of this solution is that it can accurately simulate the vibration environment of the engine in actual operation, provide a reliable basis for vibration calibration, and improve calibration efficiency and data accuracy.

[0007] As a preferred implementation of an engine vibration boundary condition calibration test bench, at least four acceleration sensors are provided, and the four acceleration sensors are respectively arranged at the left front, right front, left rear and right rear suspensions of the simulated frame connected to the engine. Such an arrangement can fully capture the vibration of the engine in three-dimensional space, which is beneficial to obtain more comprehensive vibration data, thereby improving the accuracy and comprehensiveness of the calibration.

[0008] As a preferred implementation of an engine vibration boundary condition calibration test bench, four Z-direction exciters are provided, and the four Z-direction exciters are arranged in a rectangular shape, and are respectively located at the left front position, the right front position, the left rear position, and the right rear position of the bottom of the simulated frame. This layout can evenly distribute the vibration energy, ensure that the engine is evenly and stably excited in the Z direction, thereby improving the uniformity and reliability of vibration calibration.

[0009] As a preferred implementation of an engine vibration boundary condition calibration test bench, the Z-direction exciter includes a vertical actuator, the cylinder of the vertical actuator is connected to the mounting base of the test bench by a ball hinge, and the piston rod of the vertical actuator is connected to the simulated suspension ball by a ball hinge. This design helps to achieve flexible vibration excitation while maintaining structural stability, which is beneficial to improving the operability of the test bench and the accuracy of the calibration results.

[0010] As a preferred implementation of an engine vibration boundary condition calibration test bench, the X-direction exciter and the Y-direction exciter have the same structure, including a support frame and a horizontal actuator, the cylinder body of the horizontal actuator is connected to the support frame, a connecting rod is installed on the piston rod of the horizontal actuator, one end of the connecting rod is connected to the cylinder rod of the horizontal oil cylinder by a ball hinge, and the other end of the connecting rod is connected to the simulated vehicle frame by a ball hinge. This symmetrical design helps to achieve precise control of X-direction and Y-direction vibrations and improve the vibration simulation capability of the test bench in different directions.

[0011] As a preferred implementation of an engine vibration boundary condition calibration test bench, one X-direction exciter is provided, connected to the rear side of the simulated frame, and two Y-direction exciters are provided, and the two Y-direction exciters are respectively connected to the front and rear of the same side of the simulated frame. This configuration helps to optimize the distribution of vibration energy and improve the effectiveness and economy of vibration calibration.

[0012] As a preferred implementation scheme of an engine vibration boundary condition calibration test bench, the simulated vehicle frame includes two longitudinal beams parallel to each other, the engine to be calibrated is installed between the two longitudinal beams through the engine mount, a cross beam is provided between the ends of the two longitudinal beams, an X-axis exciter is connected to the middle position of the cross beam, a connecting seat is installed on the longitudinal beam, the connecting seat is L-shaped and abuts against the outer side and bottom surface of the longitudinal beam, the Y-axis exciter is connected to the side of the connecting seat, and the Z-axis exciter is connected to the bottom surface of the connecting seat. This structural design improves the stability and rigidity of the test bench, helps to reduce external interference, and improves the accuracy of vibration calibration.

[0013] As a preferred implementation of an engine vibration boundary condition calibration test bench, the data processing module includes a data acquisition module, a calibration parameter setting module, and a calibration result analysis module. Such a modular design makes data processing more efficient and flexible, helps to quickly and accurately analyze vibration data, and provides strong support for engine vibration control and optimization.

[0014] On the other hand, the present invention also provides an engine vibration boundary condition calibration method, using the above-mentioned engine vibration boundary condition calibration test bench, comprising the following steps: S1. Setting the vibration boundary adjustment calibration parameters of the engine; S2. Start the test bench to simulate the running state of the engine under different working conditions; S3. Collect engine vibration signals and pre-process the signals; S4. Calibrate the vibration boundary conditions of the engine according to the set calibration parameters and the collected vibration signals; S5. Generate a benchmarking report to analyze and optimize the vibration characteristics of the engine.

[0015] As a preferred implementation scheme of an engine vibration boundary condition calibration method, in step S4, the characteristics of the vibration signal, including amplitude, frequency, and phase, are analyzed by an algorithm and compared with the calibration parameters to determine whether the engine vibration boundary conditions meet the requirements.

[0016] It can be seen from the above technical solutions that the advantage of the present invention is that, by adopting a 7-channel test bench, the present invention can fully simulate various working conditions of the engine in actual operation, thereby improving the comprehensiveness and accuracy of the vibration boundary condition calibration, and ensuring that the calibration results can truly reflect the actual working state of the engine. Secondly, the real-time acquisition and efficient processing capabilities of the data acquisition and processing module significantly improve the efficiency of the calibration work, making the acquisition and analysis of vibration signals faster and more accurate. In addition, the flexibility of the calibration parameter setting module allows users to make personalized settings according to the actual operating environment and test requirements of the engine, greatly enhancing the adaptability and user-friendliness of the system. The calibration result analysis module enriches the presentation of the analysis results by providing a variety of display methods such as waveform diagrams, spectrum diagrams, and vibration acceleration distribution diagrams, which is convenient for users to deeply understand the vibration characteristics of the engine and provides an important basis for performance evaluation and optimization. At the same time, the optimization of the data processing flow and the reliability of the communication protocol ensure the efficiency and accuracy of data acquisition and processing, and provide stable and reliable technical support for the entire calibration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0019] Figure 2 It is a structural schematic diagram of simulating the assembly of a vehicle frame and an engine assembly in the first embodiment of the present invention.

[0020] Figure 3 This is a flow chart of Embodiment 2 of the present invention.

[0021] Description of main reference numerals 1. Simulated frame, 11. Longitudinal beam, 12. Cross beam, 13. Connecting seat, 2. Z-axis exciter, 3. Y-axis exciter, 4. X-axis exciter, 5. Support frame, 6. Horizontal actuator, 7. Connecting rod. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0023] An engine vibration boundary condition calibration test bench, comprising: The simulated frame 1 is used to install the engine to be calibrated. The simulated frame includes two parallel longitudinal beams 11. The engine to be calibrated is installed between the two longitudinal beams 11. A cross beam 12 is commonly arranged between the ends of the two longitudinal beams 11. The X-axis exciter is connected to the middle position of the cross beam 12. A connecting seat 13 is installed on the longitudinal beam 11. The connecting seat 13 is L-shaped and abuts against the outer side surface and bottom surface of the longitudinal beam 11. The Y-axis exciter 3 is connected to the side surface of the connecting seat 13, and the Z-axis exciter is connected to the bottom surface of the connecting seat 13.

[0024] The vibration excitation device includes a Z-direction vibration exciter 2 located at the bottom of the simulated frame 1, a Y-direction vibration exciter 3 located at one side or both sides of the simulated frame 1 along the vehicle driving direction, and an X-direction vibration exciter 4 located at the front and / or rear side of the simulated frame 1 along the vehicle driving direction: the Z-direction vibration exciter 2 is provided with four, and the four Z-direction vibration exciters 2 are arranged in a rectangular shape and are respectively located at the left front position, the right front position, the left rear position and the right rear position of the bottom of the simulated frame 1; the Z-direction vibration exciter 2 includes a vertical actuator, and the vertical actuator preferably adopts a cylinder structure, the cylinder body of the vertical actuator is connected to the mounting base of the test bench by a ball hinge, and the piston rod of the vertical actuator is connected to the simulated frame 1 Ball-hinged connection; the X-axis vibration exciter 4 and the Y-axis vibration exciter 3 have the same structure, including a support frame 5 and a horizontal actuator 6. The horizontal actuator 6 preferably adopts a cylinder structure. The cylinder body of the horizontal actuator 6 is connected to the support frame 5. A connecting rod 7 is installed on the piston rod of the horizontal actuator 6. One end of the connecting rod 7 is ball-hinged to the piston rod of the horizontal piston rod 6, and the other end of the connecting rod 7 is ball-hinged to the simulated frame 1. The X-axis vibration exciter 4 is provided with one, which is connected to the rear side of the simulated frame 1. The Y-axis vibration exciter 3 is provided with two, and the two Y-axis vibration exciters 3 are respectively connected to the front and rear of the same side of the simulated frame 1.

[0025] A plurality of acceleration sensors are mounted on the simulated frame 1 for collecting acceleration signals at the engine suspension. At least four acceleration sensors are provided, and the four acceleration sensors are respectively provided at the left front position, the right front position, the left rear position and the right rear position of the simulated frame 1.

[0026] The data processing module is used to collect and process the acceleration signals of the multiple acceleration sensors, and the data processing module includes a data acquisition module, a calibration parameter setting module and a calibration result analysis module.

[0027] Embodiment 2 This embodiment provides an engine vibration boundary condition calibration method, using the engine vibration boundary condition calibration test bench of embodiment 1, including the following steps: S1. Setting the vibration boundary adjustment calibration parameters of the engine; S2. Start the test bench to simulate the running state of the engine under different working conditions; S3. Collect engine vibration signals and pre-process the signals; S4. Calibrate the vibration boundary conditions of the engine according to the set calibration parameters and the collected vibration signals; S5. Generate a benchmarking report to analyze and optimize the vibration characteristics of the engine. In step S4, the characteristics of the vibration signal, including amplitude, frequency, and phase, are analyzed by an algorithm and compared with the calibration parameters to determine whether the vibration boundary conditions of the engine meet the requirements: Waveform graph: Through time domain analysis, the vibration signal of each channel is plotted into a waveform graph with time as the horizontal axis and acceleration as the vertical axis, which intuitively shows the change of vibration over time.

[0028] Spectrum diagram: Use frequency domain analysis methods such as Fourier transform to convert the vibration signal from the time domain to the frequency domain to generate a spectrum diagram that shows the distribution of vibration energy at different frequencies.

[0029] Vibration acceleration distribution diagram: Statistical quantities such as the peak value, mean value, standard deviation, etc. of the vibration acceleration of each channel are collected and drawn into a distribution diagram or histogram to reflect the distribution characteristics of the vibration acceleration.

[0030] Calculation formula: Waveform graph: directly draw the original signal or the signal after filtering and noise reduction.

[0031] Spectrum plot:

[0032] Where x(t) is the time domain signal and X(f) is the frequency domain signal.

[0033] Acceleration distribution graph: Calculate the acceleration statistics for each channel: Mean: ; Standard Deviation: , where x i is the acceleration value of the i-th sampling point, and N is the number of sampling points.

[0034] It can be seen from the above embodiments that the beneficial effect of the present invention is that, by adopting a 7-channel test bench, the present invention can fully simulate various working conditions of the engine in actual operation, thereby improving the comprehensiveness and accuracy of the vibration boundary condition calibration, and ensuring that the calibration results can truly reflect the actual working state of the engine. Secondly, the real-time acquisition and efficient processing capabilities of the data acquisition and processing module significantly improve the efficiency of the calibration work, making the acquisition and analysis of vibration signals faster and more accurate. In addition, the flexibility of the calibration parameter setting module allows users to make personalized settings according to the actual operating environment and test requirements of the engine, greatly enhancing the adaptability and user-friendliness of the system. The calibration result analysis module enriches the presentation form of the analysis results by providing a variety of display methods such as waveform diagrams, spectrum diagrams, and vibration acceleration distribution diagrams, which is convenient for users to deeply understand the vibration characteristics of the engine and provides an important basis for performance evaluation and optimization. At the same time, the optimization of the data processing flow and the reliability of the communication protocol ensure the efficiency and accuracy of data acquisition and processing, and provide stable and reliable technical support for the entire calibration system.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine vibration boundary condition calibration test bench, characterized in that: include: A simulated vehicle frame (1) for mounting an engine to be calibrated; The vibration excitation device comprises a Z-direction vibration exciter (2) located at the bottom of the simulated vehicle frame (1), a Y-direction vibration exciter (3) located on one or both sides of the simulated suspension (1) along the vehicle travel direction, and an X-direction vibration exciter (4) located on the rear side of the simulated vehicle frame (1) along the vehicle travel direction; A plurality of three-dimensional acceleration sensors are mounted on the simulated vehicle frame (1) and are used to collect acceleration signals at the engine suspension; The data processing module is used to collect and process acceleration signals from the acceleration sensors.

2. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: At least four acceleration sensors are provided, and the four three-directional acceleration sensors are respectively provided at the left front, right front, left rear and right rear engine suspensions where the simulated vehicle frame (1) is connected to the engine.

3. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: Four Z-direction vibrators (2) are provided, and the four Z-direction vibrators (2) are arranged in a rectangular shape and are respectively located at the left front, right front, left rear and right rear of the bottom of the simulated vehicle frame (1) near the engine suspension.

4. The engine vibration boundary condition calibration test bench according to claim 3, characterized in that: The Z-direction vibration exciter (2) comprises a vertical actuator, a cylinder body of the vertical actuator is ball-hingedly connected to a mounting base of the test bench, and a piston rod of the vertical actuator is ball-hingedly connected to a simulated vehicle frame (1).

5. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: The X-axis vibration exciter (4) and the Y-axis vibration exciter (3) have the same structure, and include a support frame (5) and a horizontal actuator (6). The cylinder body of the horizontal actuator (6) is connected to the support frame (5). A connecting rod (7) is installed on the piston rod of the horizontal actuator (6). One end of the connecting rod (7) is ball-jointedly connected to the piston rod of the horizontal actuator (6), and the other end of the connecting rod (7) is ball-jointedly connected to the simulated vehicle frame (1).

6. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: One X-direction vibration exciter (4) is provided and connected to the rear side of the simulated vehicle frame (1), and two Y-direction vibration exciters (3) are provided, and the two Y-direction vibration exciters (3) are respectively connected to the front and rear of the same side of the simulated vehicle frame (1).

7. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: The simulated vehicle frame comprises two longitudinal beams (11) parallel to each other, the engine to be calibrated is mounted between the two longitudinal beams (11) via an engine mount, a cross beam (12) is arranged between the ends of the two longitudinal beams (11), an X-direction exciter is connected to the middle position of the cross beam (12), a connecting seat (13) is mounted on the longitudinal beam (11), the connecting seat (13) is L-shaped and abuts against the outer side surface and bottom surface of the longitudinal beam (11), the Y-direction exciter (3) is connected to the side surface of the connecting seat (13), and the Z-direction exciter is connected to the bottom surface of the connecting seat (13).

8. The engine vibration boundary condition calibration test bench according to claim 1, characterized in that: The data processing module includes a data acquisition module, a calibration parameter setting module and a calibration result analysis module.

9. A method for calibrating engine vibration boundary conditions, characterized in that: The engine vibration boundary condition calibration test bench according to any one of claims 1 to 8 comprises the following steps: S1. Setting the vibration boundary adjustment calibration parameters of the engine; S2. Start the test bench to simulate the running state of the engine under different working conditions; S3. Collect engine vibration signals and pre-process the signals; S4. Calibrate the vibration boundary conditions of the engine according to the set calibration parameters and the collected vibration signals; S5. Generate a benchmarking report to analyze and optimize the vibration characteristics of the engine.

10. The engine vibration boundary condition calibration method according to claim 9, characterized in that: In step S4, the characteristics of the vibration signal, including amplitude, frequency, and phase, are analyzed by an algorithm and compared with the calibration parameters to determine whether the vibration boundary conditions of the engine meet the requirements of the test site and the user's road surface.

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