A New Optimization Method for Dynamic Design of Planar Linkage With Clearances at Joints—Optimizing the Mass Distribution of Links to Reduce the Change of Joint Forces

Feng, Bin; Morita, Nobuyoshi; Torii, Takao

doi:10.1115/1.1425393

Cited by 54 publications

(27 citation statements)

References 26 publications

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“…Also, the shaking moment decreases in proportion as 77.51%. The decreases of forces being obtained are bigger than that those in a Feng et al study [17]. …”

Section: Resultscontrasting

confidence: 40%

“…Also, a procedure was introduced to estimate the maximum contact force during impact. Feng et al analyzed the joint forces of planar linkage with joint clearance and presented a new optimization method which is based on optimizing mass distribution of links to decrease the change of joint forces [17]. A four-bar mechanism with joint clearances was employed as an example, and Lagrangian mechanics was used to derive the motion equation of model mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on effect of joint clearance on dynamics of four-bar mechanism

2009

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As a result of design, manufacturing and assembly processes or a wear effect, clearances are inevitable at the joints of mechanisms. In this study, dynamic response of mechanism having revolute joints with clearance is investigated. A four-bar mechanism having two joints with clearance is considered as a model mechanism. A neural network was used to model several characteristics of joint clearance. Kinematic and dynamic analyses were achieved using continuous contact mode between journal and bearing. A genetic algorithm was also used to determine the appropriate values of design variables for reducing the additional vibration effect due primarily to the joint clearance. The results show that the optimal adjusting of suitable design variables gives a certain decrease in shaking forces and their moments on the mechanism frame.

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“…Also, the shaking moment decreases in proportion as 77.51%. The decreases of forces being obtained are bigger than that those in a Feng et al study [17]. …”

Section: Resultscontrasting

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Investigation on effect of joint clearance on dynamics of four-bar mechanism

2009

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“…More recently, Feng et al [21] developed an optimization method to control the change of inertia forces by optimizing the mass distribution of moving links in planar linkages with clearances at joints. Orden [22] presented a methodology for the study of typical smooth joint clearances in mechanical systems.…”

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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“…However, the genetic algorithm do not scale well with system complexity and computational cost increases dramatically for huge model functions. Feng et al [11] proposed a method to control the distribution of inertia forces by optimizing the mass distribution of a mechanism with joint clearance.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective Optimization of Mechanisms with Clearances in Revolute Joints

Zhang

Liang

Tay

et al. 2014

New Trends in Mechanism and Machine Science

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Despite extensive work on the evaluation of the dynamic performances of various mechanisms and multi-body mechanical systems with revolute joint clearances, limited work has been conducted in optimizing the performances of these systems. A multi-objective optimization technique is presented to examine and to quantify the effect of combined objective functions with several design variables on the response of the systems. In particular, a Kriging meta-model based on the Design-of-Experiment method is utilized to optimize the systems' performance. The reason for implementing this meta-model is to replace the computational intensive simulations with a more efficient mathematical model. In this study, a simple slider-crank mechanism with a revolute clearance joint at the slider pin is modeled, and its dynamic response is analyzed using the multi-body dynamic software, MSC ADAMS. The revolute joint clearance is modeled as a pin-in-hole dry contact utilizing the Hertzian contact force model with hysteresis damping. Response surfaces are generated on the prediction of the system's performances for three different objective functions and for different range of design variables. The objective functions are combined to develop a single response surface characterizing the dynamic responses of the system at different range of design variables in order to optimize its performance.

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A New Optimization Method for Dynamic Design of Planar Linkage With Clearances at Joints—Optimizing the Mass Distribution of Links to Reduce the Change of Joint Forces

Cited by 54 publications

References 26 publications

Investigation on effect of joint clearance on dynamics of four-bar mechanism

Investigation on effect of joint clearance on dynamics of four-bar mechanism

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

Multi-objective Optimization of Mechanisms with Clearances in Revolute Joints

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