Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

A New Numerical Method for Developing the Lumped Dynamic Model of Valve Train

[+] Author and Article Information
Jie Guo

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: guojie@hrbeu.edu.cn

Yipeng Cao

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: yipengcao@hrbeu.edu.cn

Wenping Zhang

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: zhangwenping@hrbeu.edu.cn

Xinyu Zhang

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: zhangxinyu@hrbeu.edu.cn

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 28, 2015; final manuscript received March 1, 2015; published online April 8, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(10), 101507 (Oct 01, 2015) (10 pages) Paper No: GTP-15-1065; doi: 10.1115/1.4030093 History: Received February 28, 2015; Revised March 01, 2015; Online April 08, 2015

The dynamics of valve train is influenced by stiffness, size, and mass distribution of its components and initial valve clearance and so on. All the factors should be taken into consideration correctly by dynamic model and described qualitatively and quantitatively through mathematical variables. This paper proposes a new simplified method for valve train components, namely, mode matching method (MMM) for camshaft, pushrod, rocker arm, valve, and valve spring. In this method, the amount of lumped masses for each flexible component is determined based on its natural frequencies and the considered frequency range. As a result, the dynamic model of each component is required to match its low order modes within the considered frequency range. The basis of this method is that the contributions of each component to valve train vibration are mainly in the low order modes. The numerical model of valve train is verified by an experiment conducted on a motor driven valve train system.

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Fig. 1

Schematic of valve train

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Fig. 2

Torsional and bending vibration model of camshaft

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Fig. 3

Dynamic model of pushrod

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Fig. 4

Dynamic model of rocker arm

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Fig. 5

Dynamic model of valve, retainer, and clips

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Fig. 6

Dynamic model of valve springs

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Fig. 7

Solution of rocker arm stiffness

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Fig. 8

Contact model between pushrod and valve adjuster

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Fig. 9

Schematic of cam and tappet interface

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Fig. 10

Dynamic model of valve train system

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Fig. 11

Instrumentation of pushrod

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Fig. 12

Instrumentation of valve

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Fig. 13

Analysis of valve acceleration (1100 rpm)

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Fig. 14

Fourier spectrum of cam acceleration (1100 rpm)

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Fig. 15

Valve acceleration (1100 rpm)

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Fig. 16

Pushrod force (1100 r/min)

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Fig. 17

Valve stem force (1100 rpm)




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