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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...
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...
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...
The anchorage zone between the suspender and the deck for a large span basket handle through tied arch railway bridge were studied using finite element method, The results show that the steel components bear higher stress as they are closer to the steel filling block under the dead load and the most unfavorable live load. And the stress concentration phenomenon is also more obvious. Both the bottom...
In this paper, T-type adhesively bonded joint peel test is served as simulation object, to explore a efficiently approach to model T-type adhesive bonded joint and to predict it's failure. Firstly, T-type adhesively bonded joint peel tests were conducted. Base on the measured data, load-displacement curve were plot. Secondly, on the basis of DYNA, a finite element model of T-type adhesive bonded joint...
Dynamic modeling and optimal design of a 3-DOF parallel robot with flexible links for high-speed pick-and-place operation is presented in this paper. The dynamic model is formulated using substructure displacement method. Meanwhile, the exactitude of the model is verified through the software ANSYS. A novel index, which is represented by the ratio of the sum of power consumption to the total movable...
Aiming at pounding of expansion joint in multiple continuous girder curved ramp bridge, the paper builds space dynamic model of a curved ramp bridge with expansion joint, and simulation of pier column, beam, bearing and expansion joint. Using nonlinear time history analysis, the paper demonstrates expansion joint's effect on dynamic characteristics of a curved ramp bridge in four different theoretical...
Column and tie construction timber frame is a typical style of the traditional timber structure, whose column and beam are connected by using mortise and through tenon joint. To study the static performance of through tenons, we exemplify the typical three tenons found in the wooden dwelling in west of Hunan province in china. In this paper, we have did some mechanical analysis about how three types...
In this paper, a nonlinear FEM analysis model is set up based on the finite element analysis software—ANSYS. The staggered shear wall structure and the coupled shear wall structure are analyzed with this model. Compare with traditional shear wall structures, the staggered shear wall structure has many advantages, such as providing bigger space and lateral stiffness, reducing dead weigh and seismic...
Cable force of pre-tensioned cables decreased as subsequent cables were tensioned during construction of cable-stayed reticulated structures. Reasonable construction method must be drawn up to ensure accuracy of cable force, reduce construction input and accelerate construction progress. Two methods of positive sequence analysis and inverse sequence analysis for tension construction of cable were...
In cracked high arch dam aseismic stability analysis, the physical mathematic models based on continuous medium or broken loose medium is very distant apart from the actual situation. This article regards the dam and the cracked abutment rock mass as the nonlinear continuous mass which allowing local break and big distortion, and uses dynamic contact unit model to carry on the nonlinear numerical...
To analyze the welding deformation of hull block efficiently, the mechanical method is introduced to establish the relation between the original loads, including inherent strain and stress of joint modular, and initial loads of structure model. Being taken as one joint modular, angle seam is separated from structure. The inherent stress and strain distribution of joint modular have been obtained by...
With the purpose of designing a completely decoupled XY micro-motion stage, a novel flexure hinge-based compliant parallel mechanism driven by piezoelectric actuators (PZT) is presented in this paper. The mechanism with a double symmetric structure is constructed by employing double fourbar flexures as prismatic joints due to their better stiffness performance. To obtain an accurate model, matrix...
Although the effectiveness of biofeedback using an electromyogram (EMG) has been reported, it is seldom used in ordinary therapeutic exercise because it takes time to attach electrodes. Conventional muscle force estimation methods using joint torque take time in order to solve optimization problems. In order to make the computation time shorter, a method has been proposed, which converts tip force...
This paper presents the development of a micro-scale positioning device based on two degrees of freedom (DOF) plane compliant parallel mechanism, which is featured by piezo-driven actuators and flexure joints, integrated force/torque sensor that capable of delivering 2-DOF motions with high precision and providing real-time force/torque or position information for feedback control. With optimization...
To design the heavy duty industrial robot manipulator, it must be tested and evaluated for the overall structure. The test and evaluation procedure may be followed after the parts configuration determined from the kinematics & dynamics analysis of the robot structure. During this research, we completed a feasibility study via simulation on each of the specifically designed assembly parts which...
In this paper, a mechanism based on flexible hinges and semi-cylindrical revolute joints to amplify the displacement of stack-type piezoelectric ceramic actuator is designed, and dynamic characteristics of the structure are discussed. The mechanism incorporates two semi-cylindrical revolute joints and some flexible hinges. The models of stress and friction moment of semi-cylindrical revolute joint...
Plate girder is the main pressed member in boiler steel structure of the power station. Because of its large scale and heavy loads ,the influence of the joints area is complicated to the mechanical behavior of the whole structure. It is needed to be researched whether the design method due to specification is safe. This paper contrasts the result of finite element computation with specification in...
In this study, three-dimensional laser scanning technology was employed to measure geometrical data of the human spine vertebrae. Based on the measured point-cloud data of the vertebra figuration, a detailed three-dimensional nonlinear finite element model of the lumbosacral joint L5-S1 of the spine was created and used to investigate the biomechanical properties of the lumbosacral joint. The finite...
Based on the magnetic resonance imaging (MRI) data, a 3-dimentional finite element model of knee joint was developed using the reverse modeling technology. The model includes bone, all the four main ligaments, menisci and cartilages with consideration of the transversely isotropic constitutive behavior of menisci and hyperelasticity of ligaments. The biomechanics of tibiofemoral joint under an anterior...
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