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Title

Nonlinear dynamic analysis of a four-bar mechanism having revolute joint with clearance

Year: 1395
COI: JR_TAVA-2-1_006
Language: EnglishView: 450
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Authors

Sajjad Boorghan Farahan - Department of Mechanical Engineering, Tarbiat Modares University, Jalal Al Ahmad, Nasr Bridge, Postal Code: ۱۴۱۱۵-۱۴۳, Tehran, Iran.
MohammadReza Ghazavi - Department of Mechanical Engineering, Tarbiat Modares University, Jalal Al Ahmad, Nasr Bridge, Postal Code: ۱۴۱۱۵-۱۴۳, Tehran, Iran.
Sasan Rahmanian - Department of Mechanical Engineering, Tarbiat Modares University, Jalal Al Ahmad, Nasr Bridge, Postal Code: ۱۴۱۱۵-۱۴۳, Tehran, Iran.

Abstract:

In general, joints are assumed without clearance in the dynamic analysis of multi-body mechanical systems. When joint clearance is considered, the mechanism obtains two uncontrollable degrees of freedom and hence the dynamic response considerably changes. The joints’ clearances are the main sources of vibrations and noise due to the impact of the coupling parts in the joints. Therefore, the system responses lead to chaotic and unpredictable behaviors instead of being periodic and regular. In this paper, nonlinear dynamic behavior of a four-bar linkage with clearance at the joint between the coupler and the rocker is studied. The system response is performed by using a nonlinear continuous contact force model proposed by Lankarani and Nikravesh [1] and the friction effect is considered by a modified Coulomb friction law [2]. By using the Poincaré portrait, it is proven that either strange attractors or chaos exist in the system response. Numerical simulations display both periodic and chaotic motions in the system behavior. Therefore, bifurcation analysis is carried out with a change in the size of the clearance corresponding to different values of crank rotational velocities. Fast Fourier Transformation is applied to analyze the frequency spectrum of the system response

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Paper COI Code

This Paper COI Code is JR_TAVA-2-1_006. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/500756/

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Boorghan Farahan, Sajjad and Ghazavi, MohammadReza and Rahmanian, Sasan,1395,Nonlinear dynamic analysis of a four-bar mechanism having revolute joint with clearance,https://civilica.com/doc/500756

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Type of center: دانشگاه دولتی
Paper count: 35,198
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