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Diesel engine air distribution system dynamic calculation method based on multi-body system transfer matrix

A technology of system dynamics and transfer matrix, applied in computing, special data processing applications, instruments, etc.

Inactive Publication Date: 2013-04-10
FUZHOU UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned current prior art, and to provide a research diesel engine configuration with high accuracy and good feasibility under normal working conditions while only providing limited measurement parameters and avoiding complex modeling. Calculation method of gas system dynamic performance

Method used

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Embodiment Construction

[0013] In order to describe the technical content, structural features, objectives and effects of the present invention in detail, the following will be described in conjunction with specific embodiments.

[0014] The invention uses numerical simulation to simulate the dynamic performance of the gas distribution system under normal working conditions, and proposes a set of calculation methods from cam profile fitting to dynamic model establishment and solution.

[0015] Here, the intake valve of the RD120 diesel engine under-mounted camshaft valve system is taken as an example. The specific method is as follows:

[0016] (1) First, measure the lift curve of the intake valve cam to obtain the lift curve data table, and perform smoothing processing, then select the discrete curve fitting period (generally 360 degrees) and the number of fitting items N, and use fast Fu Fourier transform (FFT) is used to obtain the fitted complex Fourier transform result, as shown in Equation 1. ...

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Abstract

The invention belongs to the field of diesel engine air distribution system researches and relates to a diesel engine air distribution system dynamic calculation method based on a multi-body system transfer matrix. The diesel engine air distribution system dynamic calculation method based on the multi-body system transfer matrix comprises the following steps of: building a cam profile Nth harmonic fitting function, selecting a state vector, a boundary condition, an initial input quantity and the like required by a multi-body system transfer matrix method, analyzing the mechanical properties of all components of an air distribution system, deducing a transfer matrix which reflects the mechanical properties, integrating all parameters to obtain a total transfer equation, solving the total transfer equation to obtain the dynamic response situation of each part, drawing the dynamic characteristic curve of each part and the like. The diesel engine air distribution system dynamic calculation method based on the multi-body system transfer matrix has the advantages that the mechanical response situations of all parts during the movement of the air distribution system can be intuitively reflected through the dynamic characteristic curves, the dynamic response results and the like of all parts, the method is suitable for air distribution systems of diesel engines with different speed types, the measuring and modeling time needed for building a three-dimensional model is greatly saved, and the obtained results are more effective than the results obtained through solution by using the traditional multi-rigid-body differential equation set.

Description

technical field [0001] The invention belongs to the research field of the gas distribution system of a diesel engine, and relates to a dynamic calculation method of the gas distribution system of a diesel engine based on a multi-body system transfer matrix. Background technique [0002] With the rapid development of science and technology in today's society, the requirements for the performance of mechanical components are getting higher and higher, and with the influence of many conditions such as the gradual shortage of various resources and the gradual improvement of environmental protection laws, diesel engine technology is moving towards high performance, high power, and low fuel consumption. , low emission, low noise and low pollution. As one of the core areas of diesel engine technology, the gas distribution system has always been the focus of research. The gas distribution system controls the ventilation process of the whole diesel engine, and plays a decisive role ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 朱光宇罗哲
Owner FUZHOU UNIV
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