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Technical Brief

Kinematic and Dynamic Characteristics Design of a Variable-Speed Machine With Slider–Crank and Screw Mechanisms

[+] Author and Article Information
Jian-Hao Yang

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: z79123x@yahoo.com.tw

Meng-Hui Hsu

Department of Mechanical Engineering,
Kun Shan University,
Tainan 710, Taiwan
e-mail: mhhsu@mail.ksu.edu.tw

Hong-Sen Yan

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 70101, Taiwan
e-mail: hsyan@mail.ncku.edu.tw

1Corresponding author.

Manuscript received October 3, 2014; final manuscript received July 15, 2015; published online August 18, 2015. Assoc. Editor: Federico Thomas.

J. Mechanisms Robotics 8(1), 014502 (Aug 18, 2015) (6 pages) Paper No: JMR-14-1277; doi: 10.1115/1.4031166 History: Received October 03, 2014; Revised July 15, 2015

Designing the variable-input speed of an existing mechanism could improve the output kinematic and dynamic characteristics of a machine. Based on this concept, this paper proposes a method to improve the kinematic and dynamic characteristics of a compound mechanism. It starts deriving with an analysis model of the kinematic and dynamic characteristics of the compound mechanism. Bezier functions with control points are used to design the variable input of the compound mechanism; and the control points and the kinematic and dynamic characteristics of the compound mechanism are determined by solving the optimal function in the optimization toolbox of matlab. Furthermore, the proposed method is illustrated by two design examples. The results show that the output kinematic and dynamic characteristics of the existing machine can be improved by designing the variable-input speed with Bezier functions.

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Figures

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Fig. 1

A compound mechanism

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Fig. 2

Loop vector of a slider–crank mechanism

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Fig. 3

Motion characteristics of example 1: (a) crank motion characteristics and (b) follower motion characteristics

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Fig. 4

Motion characteristics of example 2: (a) crank motion characteristics and (b) follower motion characteristics

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Fig. 5

Input torque characteristics of example 2

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