Synthesis of Spring Parameters to Balance General Forcing Functions in Planar Mechanisms

Matthew, G. K.; Tesar, Delbert

doi:10.1115/1.3439224

Cited by 13 publications

(4 citation statements)

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“…In addition to that Matthew and Tesar [11] showed independent parametric relationships with links contiguous or noncontiguous with the links which have springs. Furthermore, Kurt Hain [12] created force characteristics in general form for different spring mechanisms which include helical compression springs.…”

Section: Compression Spring Applicationmentioning

confidence: 88%

Linkage Mechanism Optimization and Sensitivity Analysis of an Automotive Engine Hood

Denizhan

Chew

2018

International Journal of Automotive Science and Technology

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Equipment such as a rod between vehicle body and hood or a lift strut are used to keep automobile hood in open positions during the regular maintenances or repairs. Moreover, some effort is required to open or close automobile hood because of its weight. To keep it in various opened positions and to exert the least force to open or close it, a mechanism is used in conjunction with extension, compression or torsion springs in two different configurations. Each optimization has been carried out for all these different springs, each in two configurations and results are compared. Sensitivity analysis for the design variables are examined to determine how these variables are influential on the designed mechanism. Optimization results of extension and compression springs are observed to be similar in both configurations of the designed mechanism. On the other hand, results for the torsion spring in two configurations are exactly the same for the mechanism. Sensitivity analysis shows that the designed mechanism is not sensitive on the design variables that are on the bound in both of these two configurations.

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Section: Compression Spring Applicationmentioning

confidence: 88%

Linkage Mechanism Optimization and Sensitivity Analysis of an Automotive Engine Hood

Denizhan

Chew

2018

International Journal of Automotive Science and Technology

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“…Normal springs generally result in approximate balance or require more complex adjustment mechanisms. Methodologies for optimizing static balance in linkages include those by Matthew and Tesar (1976), Mahalingam and Sharan (1986), Idlani et al (1993), and Segla et al (1998), while special adjustment mechanisms such as wrapping cams for balancing purposes are reported among others by Hain (1953), Ulrich and Kumar (1991), Fidweel (1992), and Hirose (1993).…”

Section: Introductionmentioning

confidence: 99%

Perfect Static Balance With Normal Springs

Riele

Herder

2001

Volume 2A: 27th Design Automation Conference

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In biomechanical engineering, gravity balancers are often used in orthoses carrying the weight of paralyzed limbs. In these applications, simplicity is an insuperable demand. However, known gravity balancers do not combine simplicity with perfect balance. This paper describes several gravity equilibrators providing perfect static balance. As opposed to many known solutions, the proposed balancers incorporate normal off-the-shelf springs, rather than the zero-free-length springs (springs with a length equal to zero when not preloaded or loaded externally) usually employed. The conceptional synthesis is presented, dimensional design criteria are derived, and prototypes are shown. Based on the prototype’s working principle, an ankle prosthesis, which stabilizes the patient, will be developed.

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“…Reduction of this fluctuation is usually recommended in order to reduce the variation in the input speed and the maximum torque to be delivered through the input shaft. In the bulk of the work devoted for this purpose the reduction was accomplished by either: (I) proper distribution of the link masses ifl]- [5]), or (2) attaching springs to some of the moving links ( [6]- [9]). Sherwood [I] introduced a method for determining the mass distribution of the coupler of a four-bar linkage which yields the minimum fluctuation in the input torque when the mechanism is moving against no output load.…”

Section: Introductionmentioning

confidence: 99%

“…Cenova [6] and Skreiner [7] suggested the use of a spring attached to the input and output links respectively, to reduce the fluctuation of the input torque. Mathew and Tesar [8,9] established a method for synthesis of spring parameters to satisfy specified energy levels in planar mechanisms. The method was employed for the minimization of the fluctuation of the input torque.…”

Section: Introductionmentioning

confidence: 99%

Elimination of the Fluctuation of the Input Torque of Planar Mechanisms by Spring-Cam System

Hedaya¹

1986

The International Conference on Applied Mechanics and Mechanica

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The paper proposes the use of a cam with a reciprocating or oscillating follower for the elimination of the fluctuation of the torque input to a planer mechanism. The cam is fixed to the input shaft, which is rotating at a uniform speed, and • the follower is maintained in contact with the cam by means of a spring. The expression of the input torque, which is required to drive a planar mechanism at a constant input speed, with the output leads and inertia forces considered, is derived. The cam profile is designed such that the cam input torque counters the fluctuating part of the mechanism input torque. This condition is employed in deriving the cam design equation, which is a differential equation describing the follower dsplacement. A special numerical method is proposed for the solution of this equation. Also, a formula is derived for the contact force between the cam and follower. This formula is applied at different mechanism positions, after the solution of the cam design equation, to check the contact between the cam and follower. The proposed method is applied to a four-bar linkage by using a disc cam with an oscilating follower as a numerical example.

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Synthesis of Spring Parameters to Balance General Forcing Functions in Planar Mechanisms

Cited by 13 publications

References 0 publications

Linkage Mechanism Optimization and Sensitivity Analysis of an Automotive Engine Hood

Linkage Mechanism Optimization and Sensitivity Analysis of an Automotive Engine Hood

Perfect Static Balance With Normal Springs

Elimination of the Fluctuation of the Input Torque of Planar Mechanisms by Spring-Cam System

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