Rigid body modal test method for vehicle power assembly

Abstract

The embodiment of the invention discloses a rigid body modal testing method for a vehicle power assembly. The rigid body modal testing method comprises the steps of: arranging first vibration acceleration sensors on an engine and a gearbox of the power assembly and the combination face of the engine and the gearbox; arranging a second vibration acceleration sensor on the vehicle body of the vehicle; arranging a vibration exciter on the power assembly; starting the vibration exciter, and collecting a first test result of the first vibration acceleration sensor and a second test result of the second vibration acceleration sensor; based on the working parameters of the vibration exciter, the first test result and the second test result, obtaining a power assembly comprehensive frequency response function and finally recognizing the rigid body mode of the power assembly. According to the embodiment of the invention, the vibration acceleration sensors are arranged on the vehicle body and the power assembly, so that the rigid body modal test is more accurate, the whole vehicle does not need to be disassembled, the arrangement of the sensors is more convenient, and meanwhile, the use amount of the sensors can be reduced.

Description

technical field [0001] The embodiments of the present application relate to the technical field of vehicle detection, and in particular to a method for testing a vehicle powertrain rigid body mode. Background technique [0002] The rigid body mode of the suspension system of the powertrain has an important influence on the comfort of the car. The reasonable distribution of the rigid body modes of the powertrain and suspension system can effectively filter out the low-frequency vibration from the road surface, and the car will get better good comfort. At present, the rigid body modal test methods of the vehicle powertrain under the vehicle state include: the hammer excitation method and the shaker method. The existing test methods mainly have the following problems: For the hammer excitation method, the rigid body mode of the powertrain suspension system is tested under the condition of the whole vehicle. Insufficient situation, at the same time, artificial excitation is al...

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Problems solved by technology

The existing test methods mainly have the following problems: For the hammer excitation method, the rigid body mode of the powertrain suspension system is tested under the condition of the whole vehicle. Insufficient situation, at the same time, artificial excitation is also significantly affected by human factors; for the hammer excitation method and the vibration exciter method, it is more complicated to paste the sensor on the powertrain, and it is often necessary to disassemble and assemble the sample to complete, and there are too many measuring points. Experimental error with multiple test consistency

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