16 documents found, page 1 of 2
State-of-the-art and challenges of contact-impact problems using multibody dyna...
Flores, Paulo; Lankarani, Hamid M.Multibody dynamics deals with the modelng and analysis of mechanical systems comprising multiple bodies, whose interactions are governed by kinematic constraints and external applied forces. Contact-impact events represent one of the most critical and challenges issues when dealing with dynamical systems, be-cause they can significantly affect the behavior of multibody systems. The accurate response of a collis...
Professor Jorge Ambrósio: A tribute on the occasion of his 65th birthday
Flores, Paulo; Lankarani, Hamid M.It is a great pleasure and an immense honor to write this humble and personal tribute to Professor Jorge Ambrósio on the occasion of his 65th birthday. This report is very modest, since the authors cannot summarize all the work and impact of one of the most influential researchers in the field of multibody dynamics. Further, this narrative is quite personal in the measure that it reflects the authors’ knowledge...
An investigation of a novel LuGre-based friction force model
Marques, Filipe; Woliński, Łukasz; Wojtyra, Marek; Flores, Paulo; Lankarani, Hamid M.The LuGre friction force models are amongst the most popular and powerful approaches to treat frictional contact in modeling, simulation and control of mechanical systems. However, these friction force models have some numerical difficulties related to physical inconstancies, when the systems under analysis include frictional contacts with significant variations in the normal loads. The LuGre friction force mod...
Examination and comparison of different methods to model closed loop kinematic ...
Marques, Filipe; Flores, Paulo; Roupa, Ivo; Silva, Miguel T.; Lankarani, Hamid M.This work aims at presenting, in a comprehensive manner, several approaches to model and simulate closed loop topologies using the classical Lagrangian formulation. One of the great advantages of the Lagrangian approach is its simplicity and easiness of obtaining the equations of motion. However, a critical aspect arises when the mechanical systems include closed loop topologies, since the process of deriving t...
A comprehensive survey of the analytical, numerical and experimental methodolog...
Tian Qiang; Flores, Paulo; Lankarani, Hamid M.A comprehensive survey of the literature of the most relevant analytical, numerical, and experimental approaches for the kinematic and dynamic analyses of multibody mechanical systems with clearance joints is presented in this review. Both dry and lubricated clearance joints are addressed here, and an effort is made to include a large number of research works in this particular field, which have been published ...
A study on the dynamics of a study on the dynamics of spatial mechanisms with f...
Marques, Pedro Filipe Lima; Isaac, Fernando; Dourado, Nuno; Souto, A. Pedro; Flores, Paulo; Lankarani, Hamid M.An investigation on the dynamic modeling and analysis of spatial mechanisms with spherical clearance joints including friction is presented. For this purpose, the ball and the socket which compose a spherical joint are modeled as two individual colliding components. The normal contact-impact forces that develop at the spherical clearance joint are determined by using a continuous force model. A continuous analy...
Influence of the hip joint modeling approaches on the kinematics of human gait
Costa, João P. Morais; Peixoto, Joaquim Jorge Gomes; Moreira, Pedro; Souto, A. Pedro; Flores, Paulo; Lankarani, Hamid M.The influence of the hip joint formulation on the kinematic response of the model of human gait is investigated throughout this work. To accomplish this goal, the fundamental issues of the modeling process of a planar hip joint under the framework of multibody systems are revisited. In particular, the formulations for the ideal, dry, and lubricated revolute joints are described and utilized for the interaction ...
A survey and comparison of several friction force models for dynamic analysis o...
Marques, Pedro Filipe Lima; Flores, Paulo; Claro, José Carlos Pimenta; Lankarani, Hamid M.This study is aimed at examining and comparing several friction force models dealing with different friction phenomena in the context of multibody system dynamics. For this purpose, a comprehensive review of present literature in this field of investigation is first presented. In this process, the main aspects related to friction are discussed, with particular emphasis on the pure dry sliding friction, stick–sl...
Introduction [to Contact force models for multibody dynamics]
Flores, Paulo; Lankarani, Hamid M.This chapter presents some key aspects related to the modeling and simulation of contact problems in multibody mechanical systems. First, the fundamental aspects of the classical problem of contact mechanics are briefly visited. Next, the main methodologies commonly utilized to model and simulate contact-impact problems in multibody systems are presented, namely, those based on the penalty approach and the ones...
Sensitivity analysis of friction force model parameters in multibody dynamics
Marques, Pedro Filipe Lima; Flores, Paulo; Lankarani, Hamid M.A sensitivity analysis of the parameters of the most relevant friction force models for multibody dynamics is provided in this work. For this, Dahl, Reset Integrator, LuGre and Gonthier models are revisited. The classic single degree-of-freedom mass-spring model is utilized to analyze the influence parameters. The results are presented through the friction-displacement and friction-velocity relations. Although ...