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In order to realize vibrations from one dimension to three dimension, three-translational parallel mechanism was used as the main mechanism of the micro-vibration platform, flexible hinge was used as the kinematic pair, thus the small and equivalent movement could be achieved through the elastic deformation of the material, and the error of the connection could be minimized. By analyzing the relationship...
In this study, a detailed uncertainty analysis was performed to place probability limits on model predictions for both uninjured and ACL-reconstructed joints. We investigated the effect of uncertainty in connective tissue intrinsic properties on the predicted kinematics and kinetics of the human joint under combined quadriceps and external loading observed during the load acceptance phase of the gait...
This paper presents a software package developed for the simulation of spatial mechanisms with both rigid and flexible links. In order to formulate the equations of motion of the system joint coordinates and homogenous transformation are used. Flexible links are discretised by means of the Rigid Finite Element Method (RFEM). In the paper the implementation of the package in C++ is presented. Some...
The kinematic and vibration analyses of the twin tripod sliding universal joint were carried out by using the mechanical system virtual prototype simulation software ADAMS and finite element analysis software ANSYS. Main kinematic properties and natural frequencies thereof being a theoretical basis of the following research were then obtained.
This paper presents a novel 3-DOF precision positioning stage for nanoimprint lithograph (NIL). Due to the advantages such as high positioning accuracy, dexterity, low inertial, and balanced mechanical structure, a piezo-driven flexure-based parallel mechanism is utilized. Based on Pseudo-Rigid-Body modelling theory, the kinematics of the stage is developed by simplifying the single-axis flexure hinges...
Cable-driven parallel manipulators (CDPMs) are a special class of parallel manipulators that are driven by cables instead of rigid links. So CDPMs have a light-weight structure with large reachable workspace. The aim of this paper is to provide the kinematic analysis and the design optimization of a cable-driven 2-DOF module, comprised of a passive universal joint, for a reconfigurable system. This...
In this paper, as the multibody system dynamics analysis of one dieselpsilas pushrod-type valve train is concerned, the algorithm of calculation campsilas profiles from the lift of roller tappet is presented according to the kinematics analysis firstly. Then the flexible body models of the pushrod, rocker arm and valves that are considered to have significant flexibility are built. Comparing the analysis...
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