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| Optimization of frequency conversion excitation vibration and simulation test on chaotic state in vibration mill |
| Yang Xiaolan1,2 , Liu Jifeng2,1 , Wang Zhijin 1 ,Zhang Luoming2，GAO Yuan3 |
1. College of Mechanical Engineering，Nanjing Institute of Technology, Nanjing 210013, China;
2. College of Engineering，Huanghe S & T University, Zhenzhou 450015, China |
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Abstract To deal with the low grinding efficiency of vibration mill in currency technology, the excitation mechanism dynamics are analyzed, and the Lagrange equation is deduced, and the Adams model is established. The variable sinusoidal frequency curve was set in six frequency bands, and the chaotic state charts in each frequency band are simulated such as phase trajectory, the largest Lyaponov exponent curve and amplitude-intensity distribution curve. The value in simulation shows that the larger the frequency peak, the higher the largest Lyapunov exponent and the stronger the chaotic state would be, and it is more helpful to improve the efficiency of crushing system. The optimization of frequency excitation can lead to a kind of grinding almost periodic, which high vibration intensity and large amplitude appear alternately in both ends of the 1/3 frequency band, and the mid-vibration intensity and mid-amplitude appear one after another in the 1/3 frequency band of the middle. A vibration stress field is formed in this test, which has multi-frequency and multi-amplitude, and the chaotic state is strong and weak alternating. The effectiveness of Adams model has been verified in the prototype.
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Received: 01 March 2016
Published: 15 October 2017
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