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Bionic knee was important basic driving element for biped robot. with the adult male's right leg knee working as bionic prototype, the three-dimensional finite element model was established, and the cinnections balance equation was established with the help of nonlinear contact theory, then system penalty function was used to deal with the contact constraint by considering the minimum potential energy...
In this paper, we introduce a further optimization of morphology of compliant joint based on FEM analysis for a compliant-parallel mechanism with a wide working area and a high accuracy. Compliant-parallel mechanism is the mechanism that all joints are composed by compliant joints in a parallel structure. In the integration of compliant and parallel mechanism, the motion of compliant joints can be...
The bonding technology has been widely used in the field of machinery, but still relatively infrequent in autobody. This manuscript discusses that the bonding technology is used for the bonding roof of a car. The finite element models of the bonding and welding roofs of a car are set up. The influences of the different bonding layer thicknesses to the roof static strength are discussed and the suitable...
As nano/micro devices become smaller, it is important to manipulate them with highly accurate control. The design of micro-joints is important for highly accurate movement. An elastic joint, one of type of micro-joint that is commonly used for rotational movement, however, has a limitation in terms of its small rotational range. This paper discusses a new micro-joint based on an elastic design concept...
Alternating elastic and plastic strain or even creep was inevitably produced in the solder joints under thermal cycle, vibration or impact circumstance, and finally caused the fatigue failure of solder joints and electronic equipments. The fatigue life and its failure mechanism are always the interests to the reliability of solder joints. Generally, the low-cycle fatigue induced by thermal cycling...
For a robot hand to make a stable contact with its environment and perform various tasks, it must be equipped with torque sensors to accurately measure its torques. However, conventional torque sensors are too bulky and expensive to be used for a robot hand. To cope with these problems, in this study, we propose a novel 2-DOF torque sensor, which uses the link frame of a robot hand as the torque sensor...
This paper deals with a finite element evaluation of new kind of robotic arm based on a complete inflatable structure. Soft robotics and particularly inflatable robotics are now considered as a credible alternative to classical structures for a wide field of robotics. As they are made of textile materials, inflatable robots allow compact packaging and easier robot deployment. Moreover, they could...
FEA modeling method of stamping machine has been carried out using "Yoshimura Yoshitaka" method for studying its dynamic characteristic, it provide an easy method for dynamic characteristics analysis to determine characteristic parameters. To validate the FEM results, modal parameters of the beam under the work conditions were tested based on the theory of modal analysis. The FEM results...
To investigate the response of posterior cruciate ligament rupture on the biomechanics of other principal ligaments, the MRI images of normal human knee at various flexion angles(0¡ã,25¡ã,60¡ã and 80¡ã)were developed through SONATAMESTRO 1.5T and the intact and posterior cruciate ligament deficient knee models were built based on these images. Then three different loads were applied to these models...
The finite element models have been used to evaluate the biomechanics of healthy and pathologic knee. And the imaging data provide functional representation of anatomical structures for the models. Previous studies have established the geometry of bone from Computed tomography (CT), and created the cartilage of femoral, tibial according to Magnetic Resonance Imaging (MRI). The meniscus geometric structure...
This paper presents an analysis of large range rotational flexure (or compliant) joints which were used in precision 6-DOF (degrees-of-freedom) tripod robot. In traditional parallel robot, the friction in the passive joints is one of major hurdles to achieve the high precision motion and it is necessary that all of the revolute joints should be replaced by the compliant joints to get rid of backlash...
The thermo-mechanical reliability of stacked die structures is a critical issue in 3D packaging. The assessment of the stress and the warpage of silicon dies in 3D stacked structures become important in achieving low-stress and low-warpage 3D packaging. However the parametric analyses of thermal stress and die-warpage by rigorous finite element analysis can be time consuming for 3D systems, since...
In order to research the ways of establishing holistic finite element model based on properties of joints, the vibration modal of a vertical machining center KVC1050N is analyzed using the software ANSYS and the equivalences principle of fixed, rolling and sliding joints are introduced, which are compared with the modal testing. The result shows that the FE analysis vibration modal based on characteristics...
The finite element method (FEM) approach was utilized in the analysis of jointed rock mass failure development in a large highway slope. Using FEM modelling, it was possible to investigate the formation of a basal failure surface within a highway slope as a direct result of deep excavation cutting. The modelling of FEM highlighted the importance of rock mass tensile strength and its influence on cutting-induced...
This essay sets up a virtual test method of hand grasp pressure distribution based on CAE analysis. The hand surface is partitioned, makes the grasp analysis fit the ergonomic. Degrees of freedom of hand grasp are analyzed. The motion model of hand for handle grasp is established. Geometric models of the hand muscles, bones, and joints are defined. The finite element model of hand for pressure analysis...
The thesis established the three-dimensional, comprehensive and realistic finite element model(FEM) of lumbar spine (L4-L5) using datum of Dicom with reverse engineering software, which incorporated the geometric, material and contact non-linearities was used for studying the biomechanics of a lumbar motion segment under flexion ad extension, whose structure is comprehensive, its meshing of elements...
Non-linear finite element simulation by an elastic-viscoplastic constitutive model and the experimental characterization were carried out to investigate the volume effect of BGA structure solder joints under shear stress. A solder mask defined flat type copper pad of a circular opening 480 μm diameter and Sn3.0Ag0.5Cu (SAC) lead-free solder balls of 300–760 μm in diameter, were used to fabricate BGA...
The influences of the standoff height (H), contact angle (θ), pad size and loading rate on shear fracture behavior of BGA structure Cu/Sn-3.0Ag-0.5Cu/Cu joints were investigated by finite element (FE) method. The simulation results show that the maximum Von Mises stress zones locate on the edge of the solder near the intermetallic compound (IMC) layer in the BGA joint under shear stress, the cracks...
In order to assure the dimensional quaLity of compLiant sheet metal assembly, it is quite necessary to use the numerical method to simulate and analyze the assembly process before real assembly. In this paper, the finite element analysis of the whole compLiant sheet metal assembly process is reaLized in two steps: clamping force calculation and joining and springing back simulation. Clamping force...
For a solution of repair welding, the welding process of the entire multi-layer multi-channel is simulated and analyzed. The results show that has the big welding residual stress and distortion nearby welding joint as a whole, the residual stress is bigger away from the welding joint nearer, and the residual stress existence's high-risk spot is revealed. It provides a theoretical basis for the enterprise...
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