A theoretical and experimental study of the dynamics of a four-bar chain with bearing clearance: Pin motion, contact loss and impact

Stammers, Charles W; Ghazavi, Mohammad Reza

doi:10.1016/0022-460x(91)90622-q

Cited by 12 publications

(13 citation statements)

References 7 publications

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“…The problem of impacts associated with clearances has also been investigated experimentally by Pfeiffer [400]. Stammers and Ghazavi [401] showed aperiodic response in terms of accelerations for systems with clearances. For that, a four-bar mechanism a clearance joint between the coupler and follower links was considered.…”

Section: Mechanisms With Clearance Jointsmentioning

confidence: 99%

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

Tian

Flores

Lankarani

2018

Mechanism and Machine Theory

308

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A comprehensive survey of the literature of the most relevant analytical, numerical, and experimental approaches for the kinematic and dynamic analyses of multibody mechanical systems with clearance joints is presented in this review. Both dry and lubricated clearance joints are addressed here, and an effort is made to include a large number of research works in this particular field, which have been published since the 1960's. First, the most frequently utilized methods for modeling planar and spatial multibody mechanical systems with clearance joints are analyzed, and compared. Other important phenomena commonly associated with clearance joint models, such as wear, non-smooth behavior, optimization and control, chaos, and uncertainty and links' flexibility, are then discussed. The main assumptions procedures and conclusions for the different methodologies are also examined and compared. Finally, future developments and new applications of clearance joint modeling and analysis are highlighted.

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Section: Mechanisms With Clearance Jointsmentioning

confidence: 99%

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

Tian

Flores

Lankarani

2018

Mechanism and Machine Theory

308

View full text Add to dashboard Cite

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“…Some researchers have measured the accelerations of flexible links in systems that contain clearance connections. Aperiodic link accelerations in response to periodic inputs were observed (Stammers and Ghazavi, 1991). Large amplification factors, typical of systems with impacts, were observed (Soong and Thompson 1987).…”

Section: Introductionmentioning

confidence: 93%

On the Limitations of Predictions of the Dynamic Response of Machines with Clearance Connections

Deck

Dubowsky

1994

Journal of Mechanical Design

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The results of experimental and analytical studies of the dynamic response of machines with flexible links and connection clearances are presented. These results suggest that both a large amount of variability and high sensitivity to small parameter changes and operating conditions are inherent properties of the dynamic response of such systems. This work indicates that the accuracy of dynamic force predictions given by computer simulations for such systems may be fundamentally limited, and therefore such simulations should be used with care in system design.

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“…where À) and _ d have the same meanings with the model of Wang-Liu, 14 and c Ã r is the modified restitution coefficient based on the work of Stammers and Ghazavi, 27 which can be written as follows…”

Section: An Improved Impact Modelmentioning

confidence: 99%

Modeling and analysis of impact based on numerical and experimental approaches

Zhang

Zhu

et al. 2018

Advances in Mechanical Engineering

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Impact is a universal phenomenon and has serious influences on the dynamic characteristics of mechanical system, so it is critical to accurately describe the effects of impact. In this work, a numerical and comprehensive method is presented to calculate the impact force in clearance joint during impact process, which has higher effectiveness and accuracy than the most popular used L-N model. Different from traditional contact models, where the coefficient of restitution is assumed to be a constant value nearly to 1 during impact process, the improved model in this work sets up the model of restitution coefficient related to two important parameters for impact phenomenon, which are initial impact velocity and the yield strength of the materials in clearance joints. A great number of numerical and experimental results are introduced and compared to validate the improved contact force model; it needs to be highlighted that the numerical results are based on the improved model and the most popular impact force model presented by Lankarani and Nikravesh, and the experimental results are based on two typical pendulum experimental test rigs. It can be concluded that (1) when compared to the experimental results, the numerical results based on the improved model are in better agreement than those based on Lankarani and Nikravesh impact force model; (2) the numerical results based on the improved model are in reasonable agreement with the experimental results, and the relative errors of impact force and restitution coefficient are all no more than 10% between numerical and experimental results; and (3) the improved contact force model is effective and can exactly describe the impact effects between two bodies in mechanical system.

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A theoretical and experimental study of the dynamics of a four-bar chain with bearing clearance: Pin motion, contact loss and impact

Cited by 12 publications

References 7 publications

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

On the Limitations of Predictions of the Dynamic Response of Machines with Clearance Connections

Modeling and analysis of impact based on numerical and experimental approaches

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