37 documents found, page 1 of 4

On the use of continuous sigmoid functions to smooth out the Coulomb friction f...

Coulomb friction force law is an empirical formulation which was derived by analyzing the relative motion between two bodies initially in a stationary state. It represents the friction as a constant force acting in the opposite direction of the relative tangential velocity between two sliding objects. Further, the magnitude of the friction force is equal to the product of the normal contact force and the coeffi...

Teaching kinematics and dynamics of machinery with a design project: The ping-p...

This work aims at discussing the implementation of a design project to promote the teaching-learning process of kinematics and dynamics of machinery to early undergraduate students as part of the engineering curriculum. For that, the ping-pong ball launcher challenge is chosen as a practical example, in which students, organized in groups of five, must design and develop a mechanical system capable of launching...

A comparative study of the viscoelastic constitutive models for frictionless co...

The nature of the constitutive contact force law utilized to describe contact-impact events in solid contact interfaces plays a key role in predicting the response of multibody mechanical systems and in the simulation of engineering applications. The goal of this work is to present a comparative study on the most relevant existing viscoelastic contact force models. In the sequel of this process, their fundament...

A kriging model for dynamics of mechanical systems with revolute joint clearances

Over the past two decades, extensive work has been conducted on the dynamic effect of joint clearances in multibody mechanical systems. In contrast, little work has been devoted to optimizing the performance of these systems. In this study, the analysis of revolute joint clearance is formulated in terms of a Hertzian-based contact force model. For illustration, the classical slider-crank mechanism with a revolu...

A DOE and kriging-based model for studying on the dynamics of multibody mechani...

Over the last two decades, extensive work has been done to study the dynamic effect of the joint clearances in multibody mechanical systems. In contrast, little work has been devoted to optimize the performance of these systems. In this study, analysis of revolute joint clearance is formulated in term of a Hertzian-based contact force model. For illustration, the classical slider-crank mechanism with a revolute...

Study of the effect of contact force model on the dynamic response of mechanica...

The main objective of this work is to present a computational and experimental study on the contact forces developed in revolute clearance joints. For this purpose, a well-known slider-crank mechanism with a revolute clearance joint between the connecting rod and slider is utilized. The intra-joint contact forces that generated at this clearance joints are computed by considered several different elastic and di...

Compliant contact force models in multibody dynamics : evolution of the Hertz c...

Over the last decades, several compliant contact force models have been proposed. However, no complete and systematic comparison has been done on these models, which provides information on their range of application and accuracy for use in different contact scenarios. Thus, the selection of an appropriate model for a given contact problem is still an important and challenging issue to be addressed. The Hertzia...

Formulation for planar multibody dynamics

Dynamic response of multibody systems with multiple clearance joints

A general methodology for the dynamic modeling and analysis of planar multibody systems with multiple clearance joints is presented. The inter-connecting bodies that constitute a real physical mechanical joint are modeled as colliding components, whose dynamic behavior is influenced by the geometric, physical and mechanical properties of the contacting surfaces. A continuous contact force model, based on the el...

Numerical and experimental investigation on multibody systems with revolute cle...

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...