Abstract
In this work, the influences of constraint modes and the number of disc springs on the dynamic characteristics of the disc spring system are studied by simulation and experiment. The amplitudes and amplification factors of the disc spring system under different constraint modes and different numbers of disc springs are obtained. The results show that the maximum amplitude and amplification factor both appear at the constraint modes of locking and no preloading, which indicates that the locking and no preloading is the best constraint mode among the four different constraint modes. Moreover, the amplitude of the disc spring system first increases and then decreases with the number of disc springs increasing, while the amplification factor increases with the number of disc springs increasing. The maximum amplification factor (10.21 in experiment) of the disc spring system appears at 10 disc springs. By studying the relationship between the number of disc springs and amplification factor and damping, we find that the damping of the disc spring system can be reduced by increasing the disc spring numbers, and thus, the corresponding amplification factor can be improved. Furthermore, as the number of disc spring increases, the height differences of disc springs before and after locking are all close to 3 mm, which indicates that the amount of locking compression in the assembly process has a good consistency when the number of disc springs changes. The aforementioned works can provide guidance for the industrial production in screen vibration.
Highlights
The influences of constraint modes and the number of disc springs on the dynamic characteristics of the disc spring system are studied by simulation and experiment. e amplitudes and amplification factors of the disc spring system under different constraint modes and different numbers of disc springs are obtained. e results show that the maximum amplitude and amplification factor both appear at the constraint modes of locking and no preloading, which indicates that the locking and no preloading is the best constraint mode among the four different constraint modes
The amplitude of the disc spring system first increases and decreases with the number of disc springs increasing, while the amplification factor increases with the number of disc springs increasing. e maximum amplification factor (10.21 in experiment) of the disc spring system appears at 10 disc springs
We found that the disc spring system vibrates in the vertical direction at the third order natural frequency in both the simulation and experiment, which is consistent with the direction of the vibration screen when screening particles. erefore, dynamic characteristics of the disc spring system at third order natural frequency under different constraints and number of disc springs should be focused
Summary
The influences of constraint modes and the number of disc springs on the dynamic characteristics of the disc spring system are studied by simulation and experiment. e amplitudes and amplification factors of the disc spring system under different constraint modes and different numbers of disc springs are obtained. e results show that the maximum amplitude and amplification factor both appear at the constraint modes of locking and no preloading, which indicates that the locking and no preloading is the best constraint mode among the four different constraint modes. E amplitudes and amplification factors of the disc spring system under different constraint modes and different numbers of disc springs are obtained. The amplitude of the disc spring system first increases and decreases with the number of disc springs increasing, while the amplification factor increases with the number of disc springs increasing. Due to the low stiffness of helical spring, the natural frequency is usually much lower than the resonance frequency in traditional vibration screen [6]. Due to the complex structure and use of nonlinear spring [9], the variation of stiffness is large in traditional resonance screen. Compared with the helical spring in traditional linear vibration screen and nonlinear spring in resonance screen, disc spring has the characteristics of large load bearing capacity, stable working state, long service life, and high stiffness [13, 14]. Replacing helical spring and nonlinear spring with disc spring, the whole stiffness of
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