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Engine excitation force measurement method employing window length varying phase difference correction method

An engine and phase difference technology, which is applied in the fields of accurately identifying the frequency of engine vibration signals, engine excitation force identification, amplitude, and phase fields, and can solve problems such as lack of accurate phase information.

Inactive Publication Date: 2012-12-05
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the defects of the existing identification methods, and propose an engine excitation force measurement method that uses a phase difference correction method that changes the window length to solve the problem of solving complex nonlinear equations due to the lack of accurate phase information in the engine excitation force measurement The problem

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  • Engine excitation force measurement method employing window length varying phase difference correction method
  • Engine excitation force measurement method employing window length varying phase difference correction method
  • Engine excitation force measurement method employing window length varying phase difference correction method

Examples

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Embodiment 1

[0043] (1) Use the three-wire 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 X Shaft moment of inertia J x , Moment of inertia J of the Y axis y , Moment of inertia J of the 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;

[0044] M = m m m ...

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Abstract

The invention discloses an engine excitation force measurement method employing a window length varying phase difference correction method. In the method, signal frequency error of an engine excitation frequency interval is solved by utilizing phase difference produced by adding Hanning with different time lengths during signal processing after a vibration acceleration signal on the surface or a suspension point of an engine cylinder is discretely sampled, and the signal frequency error is used for solving actual excitation frequency f, amplitude information and phase information of an enginein a vibration displacement frequency spectrum, so that the vibration displacement vector value in an excitation force measurement formula is accurately obtained and combined with other known engine parameters to calculate the excitation force F (f). The method of the invention can solve the problem that due to the lack of accurate phase information during the engine excitation force measurement,a complex non-linear equation needs to be solved.

Description

technical field [0001] This aspect relates to the field of power machinery and signal processing, specifically a method for accurately identifying the frequency, amplitude, and phase of engine vibration signals, which is applied to the identification 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 accessories, and the theoretical calculation formula usually does not consider the coupling of the engine and these a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
Inventor 杨志坚丁康王永胜张绍辉李魏华
Owner SOUTH CHINA UNIV OF TECH