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Function generation with planar four-bar mechanisms as a mixed problem of correlation of crank angles and dead center design

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Abstract

Function generation synthesis of mechanisms can be considered as the design of correlation of crank angles and dead dead-center position design. These two problems have been clearly defined and solved separately. But some problems may require both correlation of crank angles and dead dead-center design at different configurations. Such problems are called mixed function generation problems. In this paper, an overview of these mixed function generation problems for the planar four-bar mechanism are given and the problems are solved analytically or semi-analytically. Except three of them, all presented mixed function generation problem formulations are novel. The solutions of all problems including three positions for the four-bar mechanism and the solution of a problem including four positions for a four-bar mechanism are addressed. All problems are first reduced to a univariate equation and a fast solution is found. Thus, link lengths can be found quickly by changing the problem definition problems, and several design iterations can be performed in a short time. Numerical solutions of all problems have been demonstrated using Excel.

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Abbreviations

CCA:

Correlation of crank angles

DCP:

Dead-center position

EDCP:

Extended dead-center position

FDCP:

Folded dead-center position

OPT:

Optimum transmission angle

DTA:

Deviation of transmission angle from 90°

a:

Input link length of a four-bar mechanism

b:

Coupler link length of a four-bar mechanism

d:

Output link length of a four-bar mechanism

c:

Cosine

s:

Sine

ϕ:

Input angle of a four-bar mechanism

ψ:

Output angle of a four-bar mechanism

E :

Extended dead-center position (Subscript)

F :

Folded dead-center position (Subscript)

D :

Dead-center position—folded or extended (Subscript)

I/O:

Input-Output

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Correspondence to Gökhan Kİper.

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Kadak, T., Kİper, G. Function generation with planar four-bar mechanisms as a mixed problem of correlation of crank angles and dead center design. Sādhanā 49, 143 (2024). https://doi.org/10.1007/s12046-024-02483-2

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