Method for analyzing torsional vibration of shafting of vehicle range extender

Abstract

The invention relates to a method for analyzing torsional vibration of a shafting of a range extender for a vehicle. The method comprises the following steps: 1, establishing a torsional vibration model of the shafting of the range extender; 2, determining structure parameters of each node of the vibration model; 3, obtaining the inherent frequency of each order of the shafting of the vibration model according to the mechanical vibration theory; 4, calculating a corresponding excitation frequency, and judging whether the excitation frequency interferes with the inherent frequency or not; 5, ifthe judgment result is that interference does not exist, judging to obtain the shafting safety of the vehicle range extender, If the judgment result is that interference exists, performing forced vibration analysis to obtain the maximum amplitude and the maximum relative torsion angle of a resonance node of the vibration model; and 6, obtaining the maximum stress of the vibration model based on the maximum relative torsion angle so as to compare the maximum stress with the allowable stress of the material, judging that the shafting safety of the vehicle range extender is obtained if the comparison result meets the set safety coefficient, and returning to the step 2 to modify the structural parameters of each node if the comparison result does not meet the set safety coefficient. Comparedwith the prior art, the method has the advantages of accurate checking, accurate calculation result and the like.

Description

technical field [0001] The invention relates to the technical field of range extenders, in particular to an analysis method for torsional vibration of a shaft system of a range extender for a vehicle. Background technique [0002] The range extender is composed of an engine and a generator, and the two work together. The torque generated by the engine is transmitted to the motor through the power transmission device, which drives the generator to generate electricity. The electric energy generated by the generator is sent to the power battery for storage, and the battery then supplies power to the driving motor to drive the vehicle. The power transmission device, that is, the shaft system of the range extender, is composed of the pulley attachment of the engine, the crankshaft, the torsional shock absorber, and the generator shaft. Once the transmission device fails, it will affect the charging of the power battery at the slightest, and at the worst will damage the range ex...

AI Technical Summary

Problems solved by technology

It is obviously not comprehensive enough to only calculate the torque of some positions of the shafting under specific working conditions, but if the torque of each position is calculated under all working conditions, the amount of calculation is too large, and it is necessary to try to screen out the safer working conditions. Analyze more dangerous situations

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