This paper presents both experimental and numerical studies on bolted glass fiber reinforced polymer (GFRP) joints subjected to uniaxial tension different thermal conditions (?20 ?, 20 ? 60 ?). Laboratory tests are conducted obtain strength, elastic modulus deformation of the joints. The model is developed using discrete element method (DEM) that can predict not only above properties joints, bu...

Mathematical modeling and experimental research represented in this paper is aimed at dynamic force analysis of circuit cards order to eliminate or reduce stress deflection an acceptable level provide strength reliability design card assemblies subjected vibration. In conditions when viscous friction forces are negligible dampers, such as liquid cannot be used reduction oscillation amplitude cr...

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...

Fractures are planar discontinuities, i.e. interruption of the rock physical continuity, due to stresses. The geological fractures occur at every scale, so that any large volume of rock has some or many. These discontinuities are related to sudden elastic relaxation of elastic energy stored in the rock. The geological fractures have their economic importance. The loss of continuity in intact ro...

In this paper, we identify optimal swimming strategies for drag-dominated swimmers with a passive elastic joint. We use resistive force theory (RFT) to obtain the dynamics of system. then frequency domain analysis relate motion joint actuated couple elements geometric framework introduced in our previous work aimed at identifying useful gaits systems drag dominated environments, speed-maximizin...

A recursive formulation of the dynamical equations of an articulated multibody system with flexible components is given in terms of efficient motion variables for elastic motion and hinge rotation about revolute, Hooke and spherical joints. We treat motion under external forces, as well as prescribed motion with internal loads calculation, and show computational efficiency of the formulation wi...

While bipedal walking robots developed recently are based on high-gain servo to planned trajectory, our purpose is to make a robot’s behavior more natural: exploiting useful feature of the dynamics of the body itself. A new concept for controlling humanoid robots, the global dynamics approach is proposed. This is to harness the robot body by applying control input intensively around critical po...