Method for acquiring stress states of metallic frameworks of power assembly suspension system

Abstract

The invention provides a method for acquiring stress states of metallic frameworks of a power assembly suspension system. The power assembly suspension system comprises at least one suspension unit used for supporting a power assembly. Each suspension unit comprises a metallic framework and rubber. The method comprises the steps that the power assembly is simplified to be a centroid point, the mass of the power assembly is assigned to the centroid point, and the centroid point and all the suspension units are made into an overall model; a load is set for the power assembly suspension system, a contact relation is set for the driving end and the driven end of each suspension unit, and an installation constraint condition is set for each suspension unit according to a designed installation state to obtain a constraint overall model; and the constraint overall model is subjected to finite element solution to obtain the stress state of each metallic framework. Through the method for acquiring the stress states of the metallic frameworks of the power assembly suspension system, the actual work state of the power assembly suspension system can be truly simulated, and therefore the reliability of the acquired stress states of the metallic frameworks is high.

Description

technical field [0001] The invention relates to the technical field of simulation analysis of an automobile powertrain mount system, in particular to a method for acquiring a force state of a metal skeleton of a powertrain mount system. Background technique [0002] The powertrain suspension system is a key component of the car, and its importance to the safety and comfort of the vehicle is self-evident. The powertrain suspension system includes powertrain and suspension units, among which there are various types of suspension units, and the most widely used is rubber suspension, which is composed of rubber and metal skeleton. During the actual use of the vehicle, the harsh working environment and load conditions may cause wear or fracture of the metal frame. Therefore, in the development process of the powertrain mount system, it is necessary to ensure that the mount unit has sufficient strength performance, which is usually achieved by CAE analysis of the strength of the ...

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Problems solved by technology

[0004] The above-mentioned analysis method has the following problems. First, the work of extracting loads through multi-body simulation is cumbersome and the workload is large. Secondly, since the loads extracted during multi-body simulation analysis are at the center point of the suspension, the analysis model needs to be modified during the application process. Simplified, and the active and passive ends of the mount need to be calculated separately, which cannot reflect the relative movement and contact relationship between the active and passive ends of the mount, nor can it reflect the energy absorption effect of the rubber in the mount and the installation constraints of the system, so it cannot be simulated Simulate the real working state of the powertrain mounting system, so that the possible strength risk cannot be exposed. At the same time, since the powertrain mounting system works, all metal skeletons work together, and the method of analyzing individual metal skeletons one by one is adopted. Clearly there are major flaws

Therefore, the error of the force state obtained by the above analysis method is relatively large, which leads to low reliability of the analysis results and cannot serve as a good reference

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