An experimental and analytical study of impact forces in elastic mechanical systems with clearances

Dubowsky, Steven; Moening, Mark

doi:10.1016/0094-114x(78)90018-6

Cited by 55 publications

(41 citation statements)

References 12 publications

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“…Other researchers also included the influence of the flexibility of the bodies in the dynamic performance of mechanical systems besides the existence of gaps in the joints [23][24][25]. Dubowsky and Moening [26] obtained a reduction in the impact force level by introducing flexibility of the bodies. They also observed a significant reduction of the acoustical noise produced by the impacts when the system incorporates flexible bodies.…”

Section: Introductionmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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The dynamic modeling and simulation of spatial rigid-multi-body systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion.When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-tometal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intrajoint reaction forces are evaluated as functions of the geometrical, kinematical and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system's governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results it is observed that the system's performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

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Section: Introductionmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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“…Dubowsky and Moening [16] studied experimentally the interactions between clearance joints and the system elasticity, using a Scotch-Yoke mechanism. Accelerometers were used in that study to measure the impact accelerations.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on multibody systems with revolute clearance joints

et al. 2010

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A comprehensive combined numerical and experimental study on the dynamic response of a slider-crank mechanism with revolute clearance joints is presented and discussed in this paper to provide an experimental verification and validation of the predictive capabilities of the multibody clearance joint models. This study is supported in an experimental work in a test rig, which consists of a slider-crank mechanism with an adjustable radial clearance at the revolute joint between the slider and the connecting rod. The motion of the slider is measured with a linear transducer and an accelerometer.Dynamic tests at different operating crank speeds and with several clearance sizes are performed. The maximum slider acceleration, associated with the impact acceleration, is used as a measure of the impact severity. The obtained results demonstrate the dynamical behavior of a multibody mechanical system with a clearance joint. Finally, the correlation between the numerical and experimental results is presented and discussed leading to validated models of clearance revolute joints.

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“…By substituting from equations (15), (16), (18), (19), (20) and (21) into (22) (23), (7), (12) and (13) form a set of 13N first order differential equations for the 6 N y p , the 3 N t k i and the ~N E , , .…”

Section: Mass Centre Velocities and Accelerationsmentioning

confidence: 99%

Computer methods in flexible multibody dynamics

Huston

1991

Numerical Meth Engineering

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An experimental and analytical study of impact forces in elastic mechanical systems with clearances

Cited by 55 publications

References 12 publications

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Numerical and experimental investigation on multibody systems with revolute clearance joints

Computer methods in flexible multibody dynamics

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