can be originally turned into a continuous function,
consequently, the stability of the integrating
processes can be increased. Meanwhile, the
description of ‘ Stribeck effect’ also enhance the
computational accuracy of the dynamics in
multibody systems. How to describe the transition of
viscous and sliding more accurately and solve the
problem of self-excited oscillation and bifurcation
caused by them has become a hot topic in academic
research (Awrejcewicz J, 1998).
In order to solve the problem of the discontinuity
of friction in the Coulomb friction model, the
method of replacing the change curve of the friction
with a specific function has been used in the static
friction model at first when the relative velocity
approached zero (Duan Chengwu, Singh Rajendra,
2006). According to the problem of switching state
equation in friction model, Karnopp put forward the
Karnopp model which create a zero field in a region
of relatively low speed (Karnopp D, 1985). On this
basis, Leine et al (Leine R. I., Campen D. H. Van,
Kraker A. De, et al, 1998) improved the accuracy of
numerical calculation and increased the stability of
the integral process by introducing the definition of
acceleration. Threlfall (Threlfall D. C, 1978)
reduced the discontinuity of friction by using a
system of equations on the basis of the Coulomb
model. Filipe Marques et al (Marques Filipe, Flores
Paulo, Pimenta Claro J. C., et al, 2016) improved the
Threlfall model at the aspect of coefficient’s
improvement and made friction closer to the result
of the Coulomb model when the relative velocity
approaches zero. In order to obtain the ‘Stribeck
effect’, Bengisu and Akay (Bengisu M. T., Akay A,
1994) used two algebraic equations, one of them
describes the sliding and another especially
describes the ‘Stribeck effect’. Awrejcewicz
(Awrejcewicz J, Grzelczyk D, Pyryev Yu, 2009)
refined the stick-slip process and proposed a novel
friction model which is expressed as four equations.
The friction model mentioned above are some static
friction model used in high frequency in the
dynamic calculation of multibody systems in recent
years. In addition, there are many other static
friction models, for example, the Wojewoda et al
model (Wojewoda J, Stefański A, Wiercigroch M, et
al, 2008), the Ambrósio model (Ambrósio Jorge A.C,
2003), the Benson model (Benson David J.,
Hallquist John O, 1990) used in Multi-body system
software COMSOL and the Velocity-based model
used in dynamic simulation software ADAMS and
so on. Dahl firstly put forward the Dahl model (Dahl
P. R, 1968) based on microscopic deformation of
bristle, the relative motion regarded as a deformation
similar to the spring between contact surfaces in the
static stage of the friction was considered for the
first time. Based on the assumption of bristle
deformation, there are still many other models which
also think about the static friction, for instance, the
LuGre model (De Wit C. Canudas, Olsson H,
Astrom K. J, et al, 1995), the Elasto-plastic model
(Dupont P., Armstrong B., Hayward V, 2002), the
Stick-slip model (Cha Ho Young, Choi Juhwan, Han
Sik Ryu, et al, 2011) and the Gonthier model
(Gonthier Yves, Mcphee John, Lange Christian, et al,
2004) and so on. Compared to static friction models,
the most of the dynamic friction models can more
clearly and effectively reflect the friction
characteristics in the movement of the multibody
systems, thus, the more accurate results of the
dynamic analysis can be obtained. However, the
dynamic friction model contains state variables and
involves many parameters. How to determine the
value of each parameter and choose a more effective
step and method of the iteration is very important to
solve the problem as the friction phenomena are
considered in the process of motion in multibody
systems.
The purpose of this study is to analyze the effects
of different friction models on the characteristics in
friction and the results of kinematics analysis in
multibody systems with different kinds of joints.
There are eleven common friction models were
selected as research objects in this paper, in which
the static friction models respectively are the
Smooth Coulomb model, the Threlfall model, the
Bengisu model, the Karnopp model, the Velocity-
based model and the Awrejcewicz model, and the
dynamic friction models respectively are the Dahl
model, the LuGre model, the Elasto-plastic model,
the Stick-slip model and the Gonthier model. Two
typical mechanisms which only contain prismatic
joints and simultaneously contain prismatic joints
and revolute joints respectively are tested, and the
result of dynamics is compared with Adams. The
influence of friction models on the results of
kinematic simulation for different types of
multibody systems is illustrated based on the
computational efficiency and the stability of the
numerical solution of the position. Finally, the
optimal selection method of eleven friction models
for different types of multibody systems is obtained,
which provides a reference for how to more
accurately and effectively solve the dynamic
analysis when the characteristics in friction need to
be considered in the future.