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Diesel engine shaft system torsional-vibration calculating method

A shafting torsional vibration and calculation method technology, which is applied in calculation, special data processing applications, instruments, etc., can solve the problem that the coupling relationship between the auxiliary mechanism and the crankshaft shafting has not been paid enough attention, and meets the calculation requirements of the shafting torsional vibration , Response calculation is accurate, and the effect of expanding the scope of application

Inactive Publication Date: 2017-09-29
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

The coupling relationship between the auxiliary mechanism and the crankshaft shaft system has not received enough attention

Method used

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  • Diesel engine shaft system torsional-vibration calculating method
  • Diesel engine shaft system torsional-vibration calculating method
  • Diesel engine shaft system torsional-vibration calculating method

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Embodiment Construction

[0043] The present invention is described in detail below in conjunction with example.

[0044] A marine diesel generator set is mainly composed of MAN 5L21 / 31 diesel engine, generator and common base, with a rated speed of 900r / min and a rated power of 1000kW.

[0045] The crankshaft and camshaft are simplified equivalently, and the camshaft includes the gas distribution camshaft and the fuel injection camshaft. According to the torsional vibration calculation parameters of the diesel engine shaft system provided by the manufacturer, the inertia matrix, stiffness matrix and damping matrix are calculated by the lumped parameter method.

[0046] Integrate the equivalent models of the crankshaft and camshaft, and establish the equivalent model of the diesel engine shaft including the crankshaft and its subsidiary mechanisms, see figure 1 .

[0047] The gas excitation torque generated by the gas pressure change in the diesel engine cylinder is:

[0048]

[0049] In the form...

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Abstract

The invention discloses a diesel engine shaft system torsional-vibration calculating method. The diesel engine shaft system torsional-vibration calculating method comprises the following steps that 1, equivalent simplification is conducted on a crank shaft system and a cam shaft system by utilizing a centralized parameter method, and an inertia matrix, a stiffness matrix and a damping matrix are calculated; 2, torsional-vibration excitation of the crank shaft system is calculated; 3, the load torque of a cam shaft is obtained according to a moment balance equilibrium principle; 4, forced vibration response is solved by using a Newmark-beta algorithm; 5, trend terms in response calculation are eliminated by using a least square method to obtain a real value of response calculation. The method gives full consideration to the coupling relation between the cam shaft system and the crank shaft system, and response calculation is more accurate. The application range of the shaft system torsional-vibration calculating method is widened, and the shaft system torsional-vibration calculation requirement of a high-power diesel engine can be met.

Description

technical field [0001] The invention relates to the field of diesel engines, in particular to a method for calculating the torsional vibration of a shaft system of a diesel engine. Background technique [0002] The research on the torsional vibration of diesel engine has a long history, starting from the early 20th century when frequent torsional vibration faults aroused the attention of academic circles, it has been more than a hundred years of research. Nowadays, the research on torsional vibration of diesel engine shafting is becoming more and more mature, and its related calculation methods have been widely used. With the increasing power of diesel engines and the complexity of the entire power plant system, many shafting problems such as polarization, coupling oscillation, and rolling vibration have appeared in actual engineering. Conventional calculation methods can no longer meet the requirements of actual use, nor can they explain various phenomena well. [0003] T...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 李玩幽刘冲培郭宜斌卢熙群袁运博刘凯旋董烈祎
Owner HARBIN ENG UNIV
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