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The paper presents modelling and finite element simulation of a surface acoustic wave (SAW) motor based on dual friction-drive (DFD). The DFD SAW motor comprises of a flat cuboid slider tightly held between two identical piezoelectric stators typically made of lithium niobate facing each other, each stator having an interdigital transducer (IDT) fabricated on its either side. A sinusoidal excitation...
In this paper, we designed and simulated a multilayer planar resonator with target frequency of 2.5 MHz which is created over a row/column-addressed 2D CMUT array. We have shown through finite element modeling and simulations that a particle can be trapped and manipulated both in lateral and axial directions inside the fluid channel by activating CMUT elements; And calculated acoustic radiation force...
Capacitive Micromachined Ultrasonic Transducer (CMUT) is a new type of ultrasound wave generator and detector. Analytical method is intuitive to understand the mechanism and physical effects through modeling of CMUT. To optimize the design procedures of CMUT membrane undergoing large deflection, a new analytical model with the consideration of the lateral force using Von Kármán equations is proposed...
A novel method is proposed to derive the current waveform reduce noise and vibration of a switched reluctance motor in magnetically saturated region. Principle of noise and vibration reduction is based on reducing the variation of the radial force sum. To realize the minimum variation in the sum of radial forces, radial force expression for each phase should be derived. Radial force expression is...
Linear magnetic gearboxes (LMG) and magnetic lead screws (MLS) have been shown to be capable of operating at significantly higher volumetric force densities than traditional electromagnetic linear actuators (ELA). However in both such devices the linear translator must be made of magnet material and therefore if the stroke length of the translator is long the cost of the MLS and LMG will become prohibitively...
This paper presents a co-rotational concept for large-deflection formulation of cardiac catheters. Using this approach, the catheter is first discretized with a number of equal length beam elements and nodes, and the rigid body motions of an individual beam element are separated from its deformations. Therefore, it is adequate for modelling arbitrarily large deflections of a catheter with linear elastic...
Because of the complicated configuration in MEMS devices, significant technical challenges are presented for the interconnection of dissimilar materials. Since tin soldering is an effective method for joining dissimilar materials, there are still some reliability problems in later service process, such as remelting of Sn solder, excessive microstructure evolution. In the present work, a parallel gap...
A Lagrangian smoothed particle hydrodynamics (SPH)-based model is carried out to simulate ultra-precision cutting of mold steel. SPH is a meshless method, thus large material distortions that occur in the cutting problem are easily managed and SPH contact control permits a "natural" separation between workpiece and chip. Minimum cutting thickness, cutting force and heated diffusion with...
To instruct the actual engineering application, we use finite element software to establish model and give a series of static analysis on large-span steel tubular truss structure. Both of nonlinear buckling analysis and eigenvalue buckling analysis are adopted by parameter setting of the structure. Then, by linear buckling, geometric nonlinear stability and nonlinear stability analysis we achieve...
Rotary cutting of rotor and stator laminations complements the available methods in the processing of electrical steel sheet. Furthermore, with this process, a technological answer to the production of ever-thinner laminations can be found in which high-speed stamping is reaching its technical limits. This paper explicates a finite element analysis for the rotary cutting process of electrical steel...
The capsule microrobot will play an important role in the medical application such as the minimally invasive surgery in the future. In this paper, we proposed the spherical capsule robot system driven by the external magnetic field. And then we did the finite element analysis of the electromagnetic device involved in the system using ANSYS software. In the end, to verify our analysis results and establish...
This paper presents an artificial neural network based 3-DOF haptic rendering scheme to render the contact force between a rigid object and a deformable body in a virtual environment. The finite-element method (FEM) technique is widely used for solving the deformation problem. However, this method has a heavy computational load to get accurate result, so it is difficult to apply this method to haptic...
Asteroid detection has become an important part of the deep space exploration. The landing mechanism is easy to flow away from the asteroid surface because it is of microgravity and the rotation speed of the asteroid is high, thus the landing mechanism need to be fixed on the asteroid by anchor system after landing. Therefore, it is feasible to achieve a stable landing of asteroid lander, and provide...
Physical rehabilitation training using an intelligent control system is important for the people with lower limb dysfunction. In this paper, the sit-to-stand (STS) trajectory of health persons is researched based on STS biomechanics model. Several novel mechanical structures for intelligent lower limb STS rehabilitation training system are presented. According to the mechanical analysis of its finite...
The absolute nodal coordinate formulation is suitable for the structural analysis with large rotation and deformation. The nodal coordinates include global displacement coordinates and slopes which are established in the global coordinate system without using any local coordinate, and the mass matrix is constant. In this paper, the static problem based on the absolute nodal coordinate formulation...
This study presents a systematic optimal design procedure to develop an adaptive compliant gripper (ACG) for grasping objects with various sizes and shapes. A soft-add topology optimization algorithm is developed to synthesize the optimal layout of the ACG. One special characteristic of the proposed soft-add scheme is that the elements are equivalent to be numerically added into the analysis domain...
This article describes the design, fabrication and testing of a new XY nanopositioning stage constructed from a single sheet of piezoelectric material. The approach involves direct ultrasonic machining of a piezoelectric sheet to create flexural and actuator features. An industrial inkjet printer is then used to create electrode features by printing Nitric Acid directly onto the evaporated metal surface...
This paper investigates the less-studied problem of failing/yielding an object purposefully by a robotic hand. A grasp synthesis capable of using the whole limb surface of the robotic hand is designed based on internal force decomposition. The introduced approach is based on quasistatic assumption and optimization of active internal forces in order to counterbalance the formulated task wrench/load...
Robotics-assisted needle steering can enhance the accuracy of needle-based medical interventions, especially when the designated target locations are obscured by obstacles. However, the steering techniques using standard needles are not capable of achieving high curvatures and cannot follow tightly curved paths inside tissue. In this work, we introduce a new notched steerable needle with improved...
This paper proposes a fast and accurate order reduction algorithm for the extraction of compact macromodels for electrostatic actuated micro-electro-mechanical (MEMS) switches used in radio-frequency (RF) applications. The algorithm uses as input the information obtained from field simulations, in which coupled equations of electrostatic, structural-dynamic, air flow and full wave electromagnetic...
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