CN111458016A - Method for rapidly detecting vibration of drive axle assembly - Google Patents
Method for rapidly detecting vibration of drive axle assembly Download PDFInfo
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- CN111458016A CN111458016A CN201911197213.7A CN201911197213A CN111458016A CN 111458016 A CN111458016 A CN 111458016A CN 201911197213 A CN201911197213 A CN 201911197213A CN 111458016 A CN111458016 A CN 111458016A
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- axle assembly
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention belongs to the technical field of running vibration testing of an automobile drive axle, and relates to a method for quickly detecting vibration of a drive axle assembly. The drive axle fatigue life test bed and the vibration fault diagnosis system thereof test vibration working conditions, and the vibration source of the drive axle assembly is rapidly and accurately identified according to a vehicle speed vibration trend relation curve, vibration order spectrum analysis, vibration waterfall diagram analysis and heat map analysis of vibration test data so as to rapidly identify the vibration source of the drive axle assembly, thereby providing a convenient and rapid basis for improving design, improving process level and calming customer complaints.
Description
Technical Field
The invention belongs to the technical field of running vibration testing of automobile drive axles, and particularly relates to a method for rapidly detecting vibration of a drive axle assembly.
Background
At present, a part of vehicle users complain about the excessive vibration noise of the automobile transmission system of the drive axle in use, and the vibration source cannot be identified by the whole automobile department. The control of the vibration noise in the production and assembly process of the automobile drive axle mainly depends on structural design, process adjustment and the like, and the process detection of the vibration noise is almost absent in the assembly process of the drive axle assembly. Abnormal vibration often appears on user's vehicles under different use conditions, which brings trouble to users, and service personnel can not judge the solution.
So far, no relevant report of a vibration testing method for the drive axle assembly exists in China. The noise source acoustic power level is often determined in a common NVH test using the standard GBT 16539-1996-acoustic velocity method for closed machine measurements. The testing process needs to depend on equipment such as a semi-anechoic chamber test bed and the like, and the problems of complex testing process, complex data processing, high testing cost, long preparation time, complex operation, more vibration acceleration measuring points, difficult testing, low working efficiency and the like exist. Therefore, it is necessary to develop a method for detecting vibration of a drive axle assembly, and the test result is also one of the key performance indexes of the automobile drive axle.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a test method for rapidly testing the vibration levels of different running working conditions of a drive axle on a durability test bench without depending on a special NVH test device; the detection method can accurately measure the abnormal vibration of the drive axle assembly, and can quickly and accurately identify the position and the vibration energy level of the vibration according to the global trend analysis, the order spectrum analysis, the waterfall diagram analysis and the heat map analysis of the vibration test data, thereby greatly improving the work efficiency of examining the vibration reason and solving the vibration noise problem concerned by customers.
The purpose of the invention is realized by the following technical scheme:
a method for rapidly detecting vibration of a drive axle assembly comprises the following steps:
A. mounting the drive axle assembly on a drive axle assembly gear fatigue test bench; the drive axle assembly gear fatigue test bed main body consists of a drive unit and two sets of load units, and is arranged in a T shape; the two output ends of the drive axle are respectively connected with two sets of load units which are arranged in the same way through a transmission shaft, each load unit comprises a speed-raising gear box and a load electric dynamometer, the speed-raising gear boxes and the load electric dynamometers are connected through a membrane elastic coupler, a hub at the output end of the drive axle assembly is connected with the transmission shaft through a special tool fixture to output power to drive the speed-raising gear boxes, the output ends of the speed-raising gear boxes transmit the power to the load electric dynamometers, and the load electric dynamometers convert kinetic energy into electric energy which is fed back to a power grid through a voltage stabilizing;
B. running tests of various target working conditions are carried out according to a designed test flow, vehicle speed vibration trend relation curves obtained by carrying out vibration tests through a fault diagnosis expert system arranged in a drive axle assembly gear fatigue test bench can identify vibration energy changes along with vehicle speed, and vibration data are collected and recorded by a vibration analyzer arranged on the test bench;
C. and (4) carrying out real-time or post-test data analysis processing, and rapidly positioning the vibration energy increasing component and identifying the vibration source through order calculation and order analysis.
And step A, the driving unit comprises an electric dynamometer and a reduction gear box, the electric dynamometer is connected with the reduction gear box through a diaphragm elastic coupler, the dynamometer outputs power to drive the reduction gear box, and the output end of the reduction gear box is connected with the input flange of the drive axle assembly through a transmission shaft.
And step A, connecting the drive axle assembly gear fatigue test bed main body with a prefabricated T-shaped concrete foundation through a T-shaped base, installing the T-shaped concrete foundation in a prefabricated T-shaped concrete pit, and isolating vibration transmission by using a damping device between the T-shaped concrete foundation and the T-shaped concrete pit.
Further, in step C, the data analysis processing method includes global trend analysis, order spectrum analysis, waterfall graph analysis and heat map analysis.
Further, the vibration waterfall graph obtained by the global test analysis is used for observing the vibration change level of the full working condition and preliminarily identifying the order and the working condition of the peak value of the main vibration energy; the vibration order spectrum obtained by the order analysis is used for identifying main parts or friction pairs generated by vibration energy; the order analyses the resulting order heat maps for further confirmation of the location and condition of the vibrational energy generation.
Compared with the prior art, the invention has the beneficial effects that: according to the method for rapidly detecting the vibration of the drive axle assembly, the fatigue life test bed of the drive axle and the vibration fault diagnosis system thereof are adopted to test the vibration working condition, so that the vibration source of the drive axle assembly can be conveniently and rapidly identified, and a convenient and rapid basis is provided for improving the design, improving the process level and calming the complaints of customers; the drive axle vibration noise testing device can test different working conditions of the drive axle rapidly, accurately identify the position and vibration energy level of vibration generation, and greatly improve the work efficiency of checking the vibration reason of products and solving the problem that customers pay attention to vibration noise.
Drawings
FIG. 1 is a diagram of a drive axle assembly vibration rapid test apparatus;
FIG. 2 is a drive axle architecture diagram for order calculation;
FIG. 3a is a vehicle speed vibration trend plot;
FIG. 3b is a vibration waterfall plot;
FIG. 3c is a vibration order spectrum;
fig. 3d is a order heatmap.
In the figure, 1, a driving electric dynamometer 2, a diaphragm elastic coupling 3, a reduction gearbox 4, a transmission shaft 5, a torque sensor 6, a transition flange 7, a tested drive axle assembly 8, a vibration acceleration sensor 9, a special tool fixture 10, a torque sensor 11, a speed-up gearbox 12, a load electric dynamometer 13 and a fault diagnosis expert system are arranged.
Detailed Description
In order to solve the problem of complaints of vibration noise of the automobile power train suspected of originating from a drive axle in use by some vehicle users, vibration data during operation of the drive axle needs to be tested quickly and accurately.
The invention discloses a method for rapidly detecting the vibration of a drive axle assembly, which is characterized in that the drive axle assembly is arranged on a drive axle assembly gear fatigue test bench; running tests of various target working conditions are carried out according to a designed test flow, the vehicle speed vibration trend relation curve obtained by vibration tests carried out by a fault diagnosis expert system can identify the vibration energy change along with the vehicle speed, and vibration data are collected and recorded by a vibration analyzer of the test bed; DA Evaluation software is used for carrying out real-time or post-test data analysis, and order calculation and order analysis are used for quickly positioning the vibration energy increasing component and identifying the vibration source.
The drive axle assembly gear fatigue test bed main body is composed of a drive unit and two sets of load units, and is arranged in a T shape. The driving unit comprises an electric dynamometer and a reduction gear box, the electric dynamometer is connected with the reduction gear box through a diaphragm elastic coupling, the dynamometer outputs power to drive the reduction gear box, and the output end of the reduction gear box is connected with the input flange of the drive axle assembly through a transmission shaft. The drive axle assembly is fixedly installed through a special tool clamp, and two output ends of the drive axle are respectively connected with two sets of load units which are arranged in the same way through transmission shafts. The load unit comprises a speed-raising gear box and a load electric dynamometer, the speed-raising gear box and the load electric dynamometer are connected through a diaphragm elastic coupling, a hub at the output end of the drive axle assembly is connected with a transmission shaft through a special tool fixture to output power to drive the speed-raising gear box, the output end of the speed-raising gear box transmits the power to the load electric dynamometer, and the load electric dynamometer converts kinetic energy into electric energy which is fed back to a power grid through a voltage stabilizing device. The drive axle assembly gear fatigue test bench main body is connected with a prefabricated T-shaped concrete foundation through a T-shaped base, the T-shaped concrete foundation is installed in a prefabricated T-shaped concrete pit, and a damping device is arranged between the T-shaped concrete foundation and the T-shaped concrete pit to isolate vibration transmission.
A fault diagnosis expert system (Delta analyzer) is arranged in the drive axle assembly gear fatigue test bed, and the vibration state of the drive axle assembly is recorded in the endurance test process. A vibration acceleration Sensor is fixedly arranged on a main speed reducer shell through bolt connection (generally, only 1 Bosch Knock Sensor needs to be arranged), vibration signals generated in the rotary motion process are collected to be matched with rotating speed signals of a test bed, order analysis is carried out, rotary vibration orders of different parts in an assembly are calculated through order calculation software, vibration energy changes in the vibration source and endurance test process are identified, and the parts corresponding to the orders with the too fast energy changes are fault sources.
The invention applies the drive axle test platform and the sample vibration fault diagnosis device thereof, does not use special NVH test equipment, does not need to measure the operation noise, and only tests the vibration signal of the drive axle in the operation process.
The invention adopts Delta ANA L YSER to test and collect vibration data and adopts Delta Evaluation software to process the data.
The vehicle speed vibration trend relation curve obtained by the vibration test is used for identifying the vibration energy change along with the vehicle speed change;
the vibration waterfall graph obtained through global test analysis is used for observing vibration change levels under all working conditions and preliminarily identifying the order and the working conditions of the main vibration energy peak value;
the vibration order spectrum obtained by the order analysis is used for identifying main parts or friction pairs generated by vibration energy;
the resulting order heat map is analyzed in order to further identify the location and condition of the vibrational energy generation.
In the process of a fatigue test of a drive axle assembly gear, the test is carried out according to set test conditions, and along with the progress of the test, various fault changes of gear abrasion, pitting corrosion, peeling, cracks or bearings can occur to parts in the drive axle assembly under the action of test load, wherein the changes are from inexistence to light and heavy. The most obvious change characteristic is the change of vibration energy, the excitation of vibration is larger and larger along with the development of faults, the presented vibration energy is larger and larger, and a vibration fault diagnosis expert system acquires test related parameters and vibration signals, identifies test working conditions and monitors the change of the vibration energy of the same working condition along with the development of a test process. The part order was calculated prior to testing using the order calculation software shown in fig. 2, and the vibration source could be identified during testing by order analysis.
The invention utilizes the capability of a vibration fault diagnosis expert system for testing vibration signals to test the change of vibration trends (figure 3a) under different operating conditions, adopts an order analysis method to analyze a vibration order spectrum (figure 3c), a vibration waterfall graph (figure 3b) and an order heat map (figure 3d) and identifies parts or friction pairs with higher vibration energy, thereby achieving the purpose of quickly positioning a vibration source.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for rapidly detecting vibration of a drive axle assembly is characterized by comprising the following steps:
A. mounting the drive axle assembly on a drive axle assembly gear fatigue test bench; the drive axle assembly gear fatigue test bed main body consists of a drive unit and two sets of load units, and is arranged in a T shape; the two output ends of the drive axle are respectively connected with two sets of load units which are arranged in the same way through a transmission shaft, each load unit comprises a speed-raising gear box and a load electric dynamometer, the speed-raising gear boxes and the load electric dynamometers are connected through a membrane elastic coupler, a hub at the output end of the drive axle assembly is connected with the transmission shaft through a special tool fixture to output power to drive the speed-raising gear boxes, the output ends of the speed-raising gear boxes transmit the power to the load electric dynamometers, and the load electric dynamometers convert kinetic energy into electric energy which is fed back to a power grid through a voltage stabilizing;
B. running tests of various target working conditions are carried out according to a designed test flow, vehicle speed vibration trend relation curves obtained by carrying out vibration tests through a fault diagnosis expert system arranged in a drive axle assembly gear fatigue test bench can identify vibration energy changes along with vehicle speed, and vibration data are collected and recorded by a vibration analyzer arranged on the test bench;
C. and (4) carrying out real-time or post-test data analysis processing, and rapidly positioning the vibration energy increasing component and identifying the vibration source through order calculation and order analysis.
2. The method for rapidly detecting the vibration of the drive axle assembly according to claim 1, wherein the method comprises the following steps: and step A, the driving unit comprises an electric dynamometer and a reduction gear box, the electric dynamometer is connected with the reduction gear box through a diaphragm elastic coupling, the dynamometer outputs power to drive the reduction gear box, and the output end of the reduction gear box is connected with the input flange of the drive axle assembly through a transmission shaft.
3. The method for rapidly detecting the vibration of the drive axle assembly according to claim 1, wherein the method comprises the following steps: and step A, connecting the drive axle assembly gear fatigue test bench main body with a prefabricated T-shaped concrete foundation through a T-shaped base, installing the T-shaped concrete foundation in a prefabricated T-shaped concrete pit, and isolating vibration transmission by using a damping device between the T-shaped concrete foundation and the T-shaped concrete pit.
4. The method for rapidly detecting the vibration of the drive axle assembly according to claim 1, wherein the method comprises the following steps: and step C, the data analysis processing method comprises global trend analysis, order spectrum analysis, waterfall graph analysis and heat map analysis.
5. The method for rapidly detecting the vibration of the drive axle assembly according to claim 1, wherein the method comprises the following steps: the vibration waterfall graph obtained by the global test analysis is used for observing vibration change level under all working conditions and preliminarily identifying the order and the working condition of the peak value of the main vibration energy; the vibration order spectrum obtained by the order analysis is used for identifying main parts or friction pairs generated by vibration energy; the order analyses the resulting order heat maps for further confirmation of the location and condition of the vibrational energy generation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911197213.7A CN111458016A (en) | 2019-11-29 | 2019-11-29 | Method for rapidly detecting vibration of drive axle assembly |
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| CN201911197213.7A CN111458016A (en) | 2019-11-29 | 2019-11-29 | Method for rapidly detecting vibration of drive axle assembly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112595411A (en) * | 2020-12-15 | 2021-04-02 | 华域麦格纳电驱动系统有限公司 | Vibration spectrum data acquisition and processing method and device of electric drive system |
| CN112857834A (en) * | 2021-02-25 | 2021-05-28 | 浙江航驱汽车科技有限公司 | Method for evaluating running noise of double-pinion type electric power steering gear |
| CN113776599A (en) * | 2021-09-26 | 2021-12-10 | 一汽解放汽车有限公司 | Drive axle assembly lubricating oil test method |
| CN117782432A (en) * | 2024-02-23 | 2024-03-29 | 润华汽车控股有限公司 | Dynamic balance comprehensive test system for automobile front axle assembly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112595411A (en) * | 2020-12-15 | 2021-04-02 | 华域麦格纳电驱动系统有限公司 | Vibration spectrum data acquisition and processing method and device of electric drive system |
| CN112857834A (en) * | 2021-02-25 | 2021-05-28 | 浙江航驱汽车科技有限公司 | Method for evaluating running noise of double-pinion type electric power steering gear |
| CN113776599A (en) * | 2021-09-26 | 2021-12-10 | 一汽解放汽车有限公司 | Drive axle assembly lubricating oil test method |
| CN117782432A (en) * | 2024-02-23 | 2024-03-29 | 润华汽车控股有限公司 | Dynamic balance comprehensive test system for automobile front axle assembly |
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Application publication date: 20200728 |