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| Complete Vehicle Level Road Simulation Test Method Based on Multi-body Virtual Iteration |
| Received:July 20, 2020 Revised:August 05, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.10.015 |
| KeyWord:road simulation test modal analysis multi-body virtual iteration fatigue durability rain flow counting test field load spectrum acceleration test multi-axle vibration durability test |
| Author | Institution |
| LIU Yu-jin |
Beijing Foton Daimler Automobile Co., Ltd, Beijing , China |
| WANG Yi |
Beijing Foton Daimler Automobile Co., Ltd, Beijing , China |
| DUAN Kai-xin |
Beijing Foton Daimler Automobile Co., Ltd, Beijing , China |
| ZHANG Kai |
Beijing Foton Daimler Automobile Co., Ltd, Beijing , China |
| HU Yu-qian |
Beijing Foton Daimler Automobile Co., Ltd, Beijing , China |
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| Abstract: |
| The work aims to propose a method of modifying the dynamic model of bench test based on the road load spectrum collected from the test field, so as to realize the “complete vehicle level” road simulation test of multi-system. Based on cumulative damage model, four-point rain flow counting method and modal analysis, the research was carried out around the bad road in the test field associated with the bench. Through the collection of road load spectrum, pretreatment and compression, the motion posture, failure form and modal shape of parts on the complete vehicle were reproduced on the bench. Finally, the bench iteration with the road load spectrum of the complete vehicle as the expected signal was completed, the model was revised under the guidance of virtual iteration, the correlation transformation mapping relationship between the road time series signal of the vehicle and the load spectrum of the bench was established, the multi-axis endurance test based on the hydraulic servo seven-axis test bench was carried out, and the joint verification under the guidance of computer modal analysis and fatigue analysis was realized. The test results of all parts were qualified and consistent with the test field. Simultaneous verification of multi-system was realized, and the motion attitude, failure mode and modal information of the system to be tested were accurately reproduced. This test method establishes the standard of complete vehicle level road simulation test, that is, the dynamic model of bench test is adjusted by virtual iterative test technology, and the solution is proposed for the situation that the iteration of multi-system road simulation test does not converge. |
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