scholarly journals Study of the effect of contact force model on the dynamic response of mechanical systems with dry clearance joints: computational and experimental approaches

2013 ◽  
Vol 73 (1-2) ◽  
pp. 325-338 ◽  
Author(s):  
C. S. Koshy ◽  
P. Flores ◽  
H. M. Lankarani
Keyword(s):  
Dynamic Response ◽  
Contact Force ◽  
Mechanical Systems ◽  
Force Model ◽  
Clearance Joints ◽  
Contact Force Model ◽  
Experimental Approaches

scholarly journals Dynamics of Multibody Systems With Spherical Clearance Joints

2005 ◽  
Author(s):  
P. Flores ◽  
J. Ambro´sio ◽  
J. C. P. Claro ◽  
H. M. Lankarani
Keyword(s):  
Contact Force ◽  
Multibody Systems ◽  
Contact Forces ◽  
Force Model ◽  
Clearance Joints ◽  
Continuous Contact ◽  
Clearance Joint ◽  
Contact Force Model ◽  
Dynamics Of Multibody Systems ◽  
The Impact

This work deals with a methodology to assess the influence of the spherical clearance joints in spatial multibody systems. The methodology is based on the Cartesian coordinates, being the dynamics of the joint elements modeled as impacting bodies and controlled by contact forces. The impacts and contacts are described by a continuous contact force model that accounts for geometric and mechanical characteristics of the contacting surfaces. The contact force is evaluated as function of the elastic pseudo-penetration between the impacting bodies, coupled with a nonlinear viscous-elastic factor representing the energy dissipation during the impact process. A spatial four bar mechanism is used as an illustrative example and some numerical results are presented, being the efficiency of the developed methodology discussed in the process of their presentation. The results obtained show that the inclusion of clearance joints in the modelization of spatial multibody systems significantly influences the prediction of components’ position and drastically increases the peaks in acceleration and reaction moments at the joints. Moreover, the system’s response clearly tends to be nonperiodic when a clearance joint is included in the simulation.

A contact force model for the dynamic response of cracks

1994 ◽  
Vol 52 (4) ◽  
pp. 659-666 ◽  
Author(s):  
J.B. Liu ◽  
S.K. Sharan ◽  
D. Wang ◽  
L. Yao
Keyword(s):  
Dynamic Response ◽  
Contact Force ◽  
Force Model ◽  
Contact Force Model

A Nonlinear Contact Force Model for Revolute Joint with Clearance

2013 ◽  
Vol 29 (4) ◽  
pp. 653-660 ◽  
Author(s):  
Z. F. Bai ◽  
Y. Zhao ◽  
X. G. Wang
Keyword(s):  
Elastic Foundation ◽  
Contact Force ◽  
Mechanical Systems ◽  
Force Model ◽  
Nonlinear Stiffness ◽  
Stiffness Coefficient ◽  
Revolute Joint ◽  
Contact Force Model ◽  
Nonlinear Contact ◽  
Foundation Model

ABSTRACTClearances in the joints of mechanism cause vibrations and noise in mechanical systems. The contact force model is the important factor in dynamic analysis of mechanical systems with clearance. This paper presents a nonlinear contact force model for revolute joint with clearance, which is a hybrid model of the Lankarani-Nikravesh model and the improved elastic foundation model. The framework of the Lankarani-Nikravesh model is used with the nonlinear stiffness coefficient derived using the improved elastic foundation model and the damping applied in introducing the ratio of the nonlinear stiffness coefficient of the improved elastic foundation model and contact stiffness of Lankarani-Nikravesh model. Finally, the nonlinear hybrid contact force model is analyzed and discussed. The hybrid contact force model presented in this paper is a nonlinear continuous contact force model, which extends contact modeling of joints with clearance and has a greater applicable scope.

Computational and Experimental Analysis of Mechanical Systems With Revolute Clearance Joints

2013 ◽  
Author(s):  
Sony Cheriyan ◽  
Paulo Flores ◽  
Hamid M. Lankarani
Keyword(s):  
Contact Force ◽  
Computational Models ◽  
Mechanical Systems ◽  
Contact Forces ◽  
Force Model ◽  
Connecting Rod ◽  
Normal Contact ◽  
Clearance Joints ◽  
Coulomb’S Friction ◽  
Experimental Apparatus

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 dissipative approaches, namely those based on the Hertz contact theory and the ESDU tribology-based for cylindrical contacts, along with a hysteresis-type dissipative damping. The normal contact force is augmented with the dry Coulomb’s friction force. An experimental apparatus is use to obtained some experimental data in order to verify and validate the computational models. From the outcomes reported in this paper, it is concluded that the selection of the appropriate contact force model with proper dissipative damping plays a significant role in the dynamic response of mechanical systems involving contact events at low or moderate impact velocities.

Study on the dynamic interaction of multiple clearance joints for flap actuation system with a modified contact force model

2020 ◽  
Vol 34 (7) ◽  
pp. 2701-2713
Author(s):  
Qi Wan ◽  
Geng Liu ◽  
Chunyu Song ◽  
Yong Zhou ◽  
Shangjun Ma ◽  
...  
Keyword(s):  
Contact Force ◽  
Dynamic Interaction ◽  
Force Model ◽  
Clearance Joints ◽  
Actuation System ◽  
Contact Force Model

scholarly journals Research on Dynamic Characteristic of Rudder Transmission System with Multiple Clearance Joints

2020 ◽  
Vol 38 (5) ◽  
pp. 994-1000
Author(s):  
Qi Wan ◽  
Geng Liu ◽  
Chunyu Song ◽  
Shangjun Ma ◽  
Ruiting Tong
Keyword(s):  
Contact Force ◽  
Axial Length ◽  
Contact Process ◽  
Transmission System ◽  
Force Model ◽  
Heavy Load ◽  
Normal Contact ◽  
Clearance Joints ◽  
Contact Force Model ◽  
Structural Optimization And Control

In order to meet the characteristics including small clearance, heavy load and large contact area of joints existed in rudder transmission system, a new normal contact force model is established, which is suitable for the large-area contact process and considers the coefficient of nonlinear variable stiffness as well as the axial length of bearing. The applicability of this model is verified by simulations under some conditions with different clearance size, restitution coefficient, initial collision speed and bearing's axial length. Furthermore, through the user-defined subroutine interface in ADAMS software, this modified contact force model is compiled and linked into the dynamic model of the rudder transmission system. The simulation results show that the dynamic response of the system with multiple clearance joints is not a simple superposition of that with one single clearance, and the dynamic interaction between these joints intensifies the oscillation and nonlinear characteristics of the system. This study provides a theoretical reference for the structural optimization and control strategy design of aircraft with clearance joints.

scholarly journals Dynamics of Multibody Systems With Spherical Clearance Joints

2006 ◽  
Vol 1 (3) ◽  
pp. 240-247 ◽  
Author(s):  
P. Flores ◽  
J. Ambrósio ◽  
J. C. P. Claro ◽  
H. M. Lankarani
Keyword(s):  
Contact Force ◽  
Multibody Systems ◽  
Contact Forces ◽  
Force Model ◽  
Clearance Joints ◽  
Continuous Contact ◽  
Clearance Joint ◽  
Contact Force Model ◽  
Dynamics Of Multibody Systems ◽  
The Impact

This work deals with a methodology to assess the influence of the spherical clearance joints in spatial multibody systems. The methodology is based on the Cartesian coordinates, with the dynamics of the joint elements modeled as impacting bodies and controlled by contact forces. The impacts and contacts are described by a continuous contact force model that accounts for geometric and mechanical characteristics of the contacting surfaces. The contact force is evaluated as function of the elastic pseudo-penetration between the impacting bodies, coupled with a nonlinear viscous-elastic factor representing the energy dissipation during the impact process. A spatial four-bar mechanism is used as an illustrative example and some numerical results are presented, with the efficiency of the developed methodology discussed in the process of their presentation. The results obtained show that the inclusion of clearance joints in the modelization of spatial multibody systems significantly influences the prediction of components’ position and drastically increases the peaks in acceleration and reaction moments at the joints. Moreover, the system’s response clearly tends to be nonperiodic when a clearance joint is included in the simulation.

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