Appropriate analysis of the four-bar linkage

Pickard, Joshua K.; Carretero, Juan A.; Merlet, Jean‐Pierre

doi:10.1016/j.mechmachtheory.2019.04.013

Cited by 20 publications

(21 citation statements)

References 13 publications

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“…For these phases, [k] denotes the known variables and [u] denotes the unknown variables , bisection allows the entire unknown search space to be reliably explored and therefore a general solving routine is guaranteed to be able to find all solutions to the considered problem. A detailed overview of the three phases is provided in [23].…”

Section: Overview Of Interval Analysismentioning

confidence: 99%

“…The equations describing the kinematics of the four-bar linkage, formulated using a coordinate representation, are given in Eq. (5) (see [23] for the formulation). This formulation is preferable for use with interval analysis methods due to the minimal occurrence of variables in the equations, which reduces the effects of the interval dependency problem.…”

Section: Four-bar Linkage Descriptionmentioning

confidence: 99%

“…Applying the description for circuits and branches adopted from Chase and Mirth [35], each linkage classification has a specific number of circuits and branches associated with the coupler curve of the linkage. The eight linkage classifications and associated circuits and branches (detailed in [23]) are described as follows:…”

Section: Classifications and Assembliesmentioning

confidence: 99%

“…The analysis or synthesis of an appropriate design are then fittingly termed appropriate analysis and appropriate synthesis, respectively. Appropriate analysis has been explored in the previous work [23]. As well, earlier works on appropriate synthesis have been explored in [24,25].…”

Section: Introduction To Linkage Synthesismentioning

confidence: 99%

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Appropriate synthesis of the four-bar linkage

Pickard

Carretero

Merlet

2020

Mechanism and Machine Theory

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The uncertainties arising from the fabrication and operation of mechanisms, specifically the four-bar linkage, significantly affect the expected performance of the mechanism. To accommodate uncertainties during the dimensional synthesis of the four-bar linkage, the desired coupler curve response is described by any number of precision point elements and trajectory elements, where each element is specified with an allowable error. A design description which accounts for bounded uncertainties is termed an appropriate design. An appropriate synthesis method is developed to synthesize the entire set of appropriate design solutions corresponding to the desired response. This method is able to completely explore the continuous design space and each synthesized appropriate design guarantees that the resulting four-bar linkage has a corresponding coupler point which lies inside each precision point response element, and a corresponding set of continuous coupler points which remain inside the trajectory response elements from start to finish.

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Section: Overview Of Interval Analysismentioning

confidence: 99%

Section: Four-bar Linkage Descriptionmentioning

confidence: 99%

Section: Classifications and Assembliesmentioning

confidence: 99%

Section: Introduction To Linkage Synthesismentioning

confidence: 99%

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Appropriate synthesis of the four-bar linkage

Pickard

Carretero

Merlet

2020

Mechanism and Machine Theory

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“…More recently, it was reported that the differential pressure caused by the butterfly valves could be used for flow measurement [12,13]. Different from other kinds of butterfly valves, the link rod butterfly valve uses a four-bar linkage mechanism to drive the valve plate [14][15][16]. Since the moving path of the valve plate could be accurately designed via optimization of the linkage mechanism, the friction between the sealing pair on the valve seat and valve plate is drastically reduced and reliable sealing could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Kan

Chen

2020

J Braz. Soc. Mech. Sci. Eng.

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The link rod butterfly valve, which uses a four-bar linkage mechanism to drive the valve plate, is a promising candidate for treating high-temperature steam and industrial exhaust because of its reliable sealing property. In this paper, the 3D flow field in the link rod butterfly valve for high-temperature steam was simulated using computational fluid dynamics. The flow coefficient of the valve, the velocity field, the temperature distribution and the enthalpy change in the steam under different valve openings were studied. The results showed that the flow coefficient of the link rod butterfly valve increased with an accelerated slope as the rotation angle of the valve stem was enlarged over 60°. The velocity and the vorticity of the steam were dramatically increased near the valve. The steam branches were accelerated up to 15 times the inlet flow velocity when they passed through the gaps between the valve plate and the valve body, and the vorticity was as large as 76/s. The temperature of the steam passing through the valve was decreased by 50-108 K for different openings. The temperature difference in the steam on the valve plate was as high as 400 K, which makes a challenge for the material of the valve plate. Larger enthalpy drop of the steam was resulted in when the valve was working at the throttling state than fully opened. Local peaks for the enthalpy drop were observed as the valve stem was rotated by 30° and 60°, and the local valley was at about 50°. The present study may serve as a useful reference for the design of link rod butterfly valves.

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Design of Post-Curing Inflator Using Bistable Locking Mechanism

Anwar

Khatait

Mukherjee

2021

Lecture Notes in Mechanical Engineering

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Bistable systems have two distinct stable states, where the system stays without any application of external power. In this paper, stable states of the buckled beam are used along with a four-bar mechanism to design a locking for the postcuring inflator. Post-curing of tires is necessary to avoid deformation in nylon fabric during cooling. Current setups, available in the market, use external force loop for the application of pressure during the process causing significant bending stresses in the frame, hence making the design bulky. Further, such conventional setup limits the number of simultaneous operations on a shop floor. In this paper, we propose a bistable structure-based locking mechanism, where, loading elements are in tension instead of bending, which makes the whole setup compact. We also discussed the scope of pseudo-bistability for design consideration.

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Appropriate analysis of the four-bar linkage

Cited by 20 publications

References 13 publications

Appropriate synthesis of the four-bar linkage

Appropriate synthesis of the four-bar linkage

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Design of Post-Curing Inflator Using Bistable Locking Mechanism

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