Method for measuring energizing force of engine by continuous refinement analytical Fourier transform method

A technology of Fourier transform and measurement method, which is applied in amplitude and phase correction, engine excitation force measurement, and frequency fields, and can solve the problems of lack of phase information, nonlinearity, and complex solution in engine excitation force measurement

Inactive Publication Date: 2011-02-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to address the defects of existing measurement methods, provide a method for measuring engine excitation force using continuous refinement analysis Fourier transform method, extract the precise frequency, amplitude and phase information of vibration signals at each response point, and solve the problem of engine excitation force. Force measurement requires solving complex nonlinear problems due to lack of phase information

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  • Method for measuring energizing force of engine by continuous refinement analytical Fourier transform method
  • Method for measuring energizing force of engine by continuous refinement analytical Fourier transform method
  • Method for measuring energizing force of engine by continuous refinement analytical Fourier transform method

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Embodiment 1

[0054] (1) Use the three-line pendulum engine moment of inertia test bench to test: a 1.8L inline four-cylinder engine mass m, engine mass center O, establish a coordinate system O-XYZ with the center of mass O as the origin; then test the engine around the coordinate system Moment of inertia J of X axis x , Moment of inertia J of the Y axis y Moment of inertia J of Z axis z , The product of inertia J of the engine about the X-axis and Y-axis xy , the inertia J of the Y axis and the Z axis yz , the inertia J of the Z axis and the X axis zx , forming the engine mass matrix M;

[0055] M = m m m J x - ...

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Abstract

The invention discloses a method for measuring the energizing force of an engine based on vibration response, and relates to the fields of motive power machines and signal processing. The method comprises an exciting force measure equation and a continuous refinement analytical Fourier transform method. In the method, a panorama spectrum is made for a vibrating acceleration signal on the surface or a suspension point of an engine cylinder body, the real energizing frequency f, amplitude and phase information of the engine in a vibration displacement frequency spectrum are obtained accurately in energizing frequency intervals of the engine in the panorama spectrum by adopting Fourier transform (FT) refinement operation, an accurate value of a vibration displacement vector in the exciting force measure equation is solved, and the energizing force F(f) is calculated by combining other known engine parameters. The method of the invention can solve the problem that complicated nonlinear equations are needed to be solved due to the deficiency of accurate phase information in the process of measuring the energizing force of the engine.

Description

technical field [0001] This aspect relates to the measurement of engine excitation force in power machinery and signal processing, in particular to the method of applying continuous refinement analysis Fourier transform signal processing method to the correction of frequency, amplitude and phase of engine vibration signal to obtain the measurement method of engine excitation force . Background technique [0002] At present, the excitation force of the engine is mainly calculated by the rigid body dynamics model, and the main factors considered in the calculation are the excitation generated by the gas explosion force, rotational inertial force and reciprocating inertial force in the cylinder. The main disadvantage of this method is that accurate parameters need to be obtained, and it is very difficult to obtain accurate parameters, such as the rolling moment caused by gas explosions. On the other hand, in actual situations, the engine is always connected with many accessori...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 杨志坚丁康王永胜杨翠丽徐传燕
Owner SOUTH CHINA UNIV OF TECH
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