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The simulation and construction of a novel ultrasonic transducer for medical application are presented. The process starts with the simulation, using the necessary components involved in the construction of the transducer. The Finite Element Method (FEM) was used as a software tool in the simulation. Once the simulation was ready the transducer was constructed. Some important aspects in the construction...
In breast conserving surgery clinicians may benefit from information from preoperative images (e.g. high quality dynamic contrast enhanced magnetic resonant image obtained in the prone position), by registering them to the supine patient on the operating table in the theatre. Due to large deformation involved between prone and supine, either non-rigid intensity-based mage registration methods or biomechanical...
Finite elements analysis (FEA) simulations showed that small strain shear modulus and the nonlinear behavior play roles in the changes of image contrast as the material deforms. The clinical relevance of this work is that nonlinear elasticity of the object being imaged may not only affect the image quality during strain imaging but might also provide information that can be used to differentiate tissues...
Due to the high corrosion and chemical resistance, the fiber reinforced polymer( FRP) materials are increasingly being used for the tall slender thin-walled structure, such as smoking desulfuration absorber tower. The properties of this slender fiber reinforced polymer absorber tower are: the aspect ratio is 2.5 and the ratio of the wall thickness to its radius is taken to be 0.0038. So the seismic...
Modal superposition analysis was used in the calculation of crankshaft dynamic strength and fatigue life based on rigid-flexible multi-body system dynamics analysis and finite element analysis, this paper verified the precision of crankshaft finite element modal by experiment modal analysis, resulted the position of max stress and dynamic variation during the engine working, calculated the dynamic...
Fatigue failure of the circuit board's research focuses on the influence to the circuit board of vibration of rigid circuit board type, distribution of Electronic Components on the board etc. And there is relatively little research to the flexible circuit board's fatigue life research. Local stress-strain method is used to predict the fatigue life. Simulate actual fatigue test load conditions to established...
Phononic crystals exhibit unique dynamic characteristics that make them act as tunable mechanical filters for elastic or acoustic wave propagation. The introducing of the idea of PCs in engineering structures provides a new technique for the control of vibration and noise. In this paper, basing on the Mindlin plate theory, the Timoshenko beam theory and the Bloch theorem, an efficient finite element...
Fatigue tests has been completed. A lot of bushing failed. In order to improve the effective lifetime of rubber bushing used in chassis, research the failure mechanism of rubber bushing, a finite element model of rubber bushing was build, and then simulated with FEM. The results showed that on the rubber bushing stress nephogram, the position of the maximum stress is just the place where the rubber...
Applications of the reconfigurable fix Turing system for machining operations of thin-walled compliant parts are becoming more and more extensive. Compared with dedicated fixtures and jigs, the reconfigurable fix Turing system need to meet distinctive requirements. This paper discusses the process planning and simulation strategies for the multi-point vacuum suction cups reconfigurable fix Turing...
Corrosion of oil tubular goods is becoming more and more serious in the exploitation of oil and gas wells, so it is very significant to study new anti-corrosion materials of lined steel pipe. Aiming at the mechanical problem of lined steel pipe hydro-forming, a parametric finite element analysis (FEA) mechanical model is established in this paper to simulate the plastic forming process of lined steel...
Shrink flanging is a main fashion in rubber forming, which is a very important manufacture method in aircraft fabrication. Spring back of the part during unloading largely determines whether the part conforms to the die design dimensions and tolerances. A typical shrink flanging part is used to analyze the spring back control method. The finite element model is set to simulate the forming process...
Multiscale or multi-physics modeling play a major role in many important problems today. In the past few years, there have been increasingly growing research activities aiming at developing novel multiscale computational methods. In this work, we focus on one challenge multiscale heterogeneous problem, modeling electromagnetic wave scattering from a composite unmanned aerial vehicle (UAV). Two new...
Compliance with EU regulations for environmental protection sets new performance criteria to fuel injection technology in modern combustion engines for passenger and commercial vehicles. According to EURO-5 norm regulation the quality of the air/fuel mixture combustion depends mainly on an adequate spraying of the fuel, with as fine as possible droplets. The paper introduces the construction, validates...
This paper presents thermo-mechanical investigation results of a reconfigurable wafer-scale integrated circuit, the WaferIC™, dedicated to electronic systems prototyping. The proposed approach carefully selects materials combined with an active cooling mechanism to avoid critical localized thermal peaks and associated large thermal stresses. The performance of the approach was evaluated and tested...
In this paper, a high-low coupled two-scale finite element method (TSFEM) for thermo-elastic problem in composite with small periodic perforated configuration is proposed. Some finite element approximate errors corresponding to TSFEM are presented.
This paper presents the design of a novel 4-DOF (x-y-θx-θy) flexure-based system used for coaxial alignment. The movable head (a rigid rod) of the system is suspended with two monolithic flexural mechanisms constructed with leaf flexures. To achieve the required x-y-θx-θy motion, the leaf-type flexures are specially arranged in such a configuration that is compliant in the specified axes but stiff...
Based on the theory for small fields superposed on finite biasing fields, the finite element model of a high frequency, double-layer plate, thickness-shear vibration pressure sensor under biasing field is set up, and a biasing field finite element method (BFFEM) is proposed. Both ends of the piezoelectric plate, vibrating in thickness-shear mode, are subjected to bending moment and axial force, excited...
To lend more confidence to the engineers adopting the fracture mechanics approach in the study of delamination in IC packages, a series of studies is performed to investigate the interactions of multiple delaminations and the impact of the die edge. Finite element models are constructed and the energy release rate (ERR) of the crack tips calculated using the virtual crack closure method and J-integral...
Low back pain was paid more attention, due to cause a decline in the quality of life and great economic costs. There are many risk factors for low back pain using manual material handing, such as poor postures, excessive force and vibration, manual material handing is a high incidence of low back pain industry. This study analyzed the gravity torque, erector spinae muscle strength as well as the extrusion...
A two-die stacked silicon module with TSV has been developed in this work. Thermal-mechanical analysis has been performed and TSV interconnect design is optimized. Multiple chips representing different functional circuits are assembled using flip chip interconnection methods. Silicon carrier is fabricated using via-first approach, the burrier copper via is exposed by special backgrinding process....
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