Engine power assembly mass and center of mass testing method

Abstract

The invention discloses an engine power assembly mass and center of mass testing method. The method comprises the steps of putting an engine power assembly on a test platform supported by a pressure sensor; then measuring a distance from a power assembly preset reference point to a test platform support point, reading a reading value displayed on the pressure sensor, changing a putting posture of the power assembly, repeating the processes above for 2-3 times, utilizing positions of four corner points of the test platform, coordinates of three reference points on the power assembly in a power assembly coordinate system and the above measured distance and displayed reading value to calculate and obtain coordinate data of an engine power assembly mass and center of mass in the power assembly coordinate system. Compared with the prior art, the engine power assembly mass and center of mass testing method has the advantages that the size of the power assembly to be measured is not limited, and the putting position and posture angle do not need to be mutually perpendicular; the number of times of putting the power assembly to be measured is few, and measuring is simple and convenient; the test theory and algorithm are novel, and corresponding calculation software is created originally; evaluation can be conducted on the test operation process, and thus it is ensured that the test result has high precision.

Description

technical field [0001] The invention belongs to the technical field of testing the center of mass of a rigid body, in particular to a method for testing the center of mass of an engine power assembly. [0002] technical background [0003] Automobile powertrain is an assembly composed of engine and transmission. Accurate data of the mass of the powertrain of the automobile engine and the position of the center of mass in the powertrain are important basic data indispensable for the design of automobile balance and vibration reduction. However, because the internal structure of the powertrain is very complex, it is difficult to establish an accurate digital model for structural numerical analysis, so the center of mass of the powertrain is difficult to obtain by structural numerical analysis and calculation, and generally must be obtained through actual testing. At present, there are mainly theodolite test method, grating displacement test method, motion equation solution met...

AI Technical Summary

Problems solved by technology

The three-line pendulum method needs to repeatedly adjust the attitude of the object under test (more than 6 to 7 times) to test the center of mass of the powertrain. The test process is time-consuming and laborious.

The basic principles of the bracket method and the triangular base moment balance method are to solve the mass center of the powertrain und

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