Estimation of valve spring surge amplitude using the variable natural frequency and the damping ratio |
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Authors: | H Liu D Kim |
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Institution: | 1.Graduate School of Mechanical and Automotive Engineering,University of Ulsan,Ulsan,Korea;2.Department of Mechanical and Automotive Engineering,University of Ulsan,Ulsan,Korea |
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Abstract: | Internal vibration of the valve spring is a critical factor in determining the dynamic characteristics of high-speed valve
train systems. Because precise prediction of the spring surge amplitude is a difficult problem, especially for nonlinear variable-pitch
springs, the development stage requires a process of trial and error. In the present study, a new method that considers the
variable natural frequency and variable damping ratio is proposed to predict the spring surge amplitude. First, the change
in the natural frequency and damping ratio caused by compression is predicted from the initially given pitch curve at the
free height. Second, the spring surge amplitude is estimated by solving the wave equation with nonlinear variable coefficients.
The surge amplitudes of typical valve springs are also measured using a motoring test rig and are compared with theoretical
results predicted by the spring drawing and cam profile data. |
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Keywords: | |
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