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This paper reports the development of a soft tactile sensor with variable compliance. The concept is based on a magnetic Hall-Effect sensor coupled with a soft, pressure controlled pneumatic chamber. The sensor design is developed using computational Finite Element models. A physical prototype is then fabricated and evaluated in experimental tests, demonstrating that the sensor can be conveniently...
In this paper, an arbitrary power division ratio (k2) power divider with prescribed wideband negative group delay (NGD) is presented using finite unloaded quality factor (Qu) resonators. The proposed power divider does not require any additional lumped resistive element to generate the NGD. From the analysis, it is found that the NGDs through different transmission paths are almost same and independent...
In this paper, the circuit model of 1000A/75mV shunt was calculated based on field-circuit coupling method by designing an interactive computer program between numerical analysis in MATLAB and finite element analysis in ANSYS. The calculate results provide the basis to analyzing measurement results when measuring transient current or alternating current with shunt.
This paper proposes an effective electromagnetic analysis method for simulating periodic organic solar structures. The Finite Element Method (FEM) is derived to analyze the Organic Solar Cell (OSC), and the Periodic Boundary Condition (PBC) is enforced on the boundary of the OSC to model the infinite organic solar structure. So that the infinite organic solar structure can be solved by analyzing only...
Based on one dimensional first-order basis function, the construction process of the second and third-order scalar hierarchical basis functions in two dimensional case is given. The second and the third-order basis functions are applied to discontinuous Galerkin time domain (DGTD) algorithm. The influence of order of the basis function in accuracy of DGTD is analyzed.
This paper simulates scattering properties of metasurfaces by finite difference time domain(FDTD) method with generalized sheet transition conditions (GSTCs) to alleviate computational burden. It is found that a metasurface can be represented by the electric and magnetic polarization densities, which is related to electromagnetic field by GSTCs. The GSTCs are thereby implemented in 3D FDTD codes and...
In this paper, a novel hybrid technique for radiation pattern computation of an Axially Displaced Ellipse (ADE) is proposed and demonstrated. The proposed technique employs the combination of HFSS and Physical Optics (PO). As a result, a highly accurate radiation pattern has been obtained using our method. Because computation time and memory usage of this technique are much less than that of other...
Magnetic coupling resonance wireless power transmission is a new technology to realize the wireless transmission of energy by means of high frequency coupling resonance between the coils. The variation of the coupling coil size and the relative position will change the mutual inductance between the windings, which will finally affect the characteristics of the infinite power transmission system. Using...
An improvement equivalent circuit method (ECM) for analyzing finite and curved frequency selection surface (FSS) is proposed in this paper, double-square-loop FSS has been used in the curved FSS and the transmission coefficients of both TE and TM models have been analyzed by the ECM and full wave method. It has been shown that the improvement ECM has saved computational time in designing curved FSS,...
In this paper, a phase quantization method named appropriate recursive comparative compensation method (ARCCM) is presented. ARCCM develops on the basis of recursive comparative compensation method (RCCM) using the phased array antenna virtual bit technology (VBT). In allusion to one-dimensional uniform linear array, ARCCM is analyzed and simulated. Compared with other methods, the beam pointing accuracy...
In this paper, a reflective metasurface consists of 19 × 19 unit cells is designed, which can effectively convert general incident linear co-polarized wave to orbital angular momentum (OAM) with different modes. Using this reflective metasurface, we achieved OAM with mode 1, 2 and 3, and provides their phase and magnitude distribution in near field, as well as far field radiation pattern. Reflective...
An element failure diagnosis method for phased array antenna is proposed. The method is based on the matrix method by solving inverse matrix to retrieve the excitations of the antenna under test. Taking advantages of the phase shift of the excitation, the receiving probe can be fixed during the measurement process to reduce positioning errors. The results have good accuracy to identify the locations...
A surface lumped circuit model is formulated for the discontinuous Galerkin time-domain modeling of devices with lumped elements. A leap-frog algorithm is used for time integration, resulting in an explicit and conditionally stable time-marching algorithm. A microstrip filter with four ports and two lumped elements is simulated to validate the proposed method.
The near-field analytical solutions for light scattering by metal nanospheroids are presented by solving Maxwell's equations in spheroidal coordinate using the separation of variables method (SVM). Based on the vector spheroidal wave functions (VSWFs), the expressions for the internal and the scattered fields are derived analytically. Then the effectiveness and correctness of the method are verified...
The method for extracting natural vibration frequencies and modes of design models arising when the finite element method is applied to the problems of structural and solid mechanics is proposed. This approach is intended to be used on multicore SMP computers and is an alternative to the conventional block Lanczos and subspace iteration methods widely used in modern FEA software. We present the main...
In this paper, a procedure based on three-dimension matrices is presented: it is the generalization of multiconductor cell analysis to any transmission line where the positions of all the active and passive conductors may change with continuity along their development. A meaningful example of this is given by three-core single lead-screened armoured cables where cores and armour wires are wound helically...
The research and design of liquid-cooled integrated circuits (IC) relies heavily on accurate simulation. Ideally, finite-element-method (FEM) based tools should be used for this purpose. However, in most cases a fully coupled thermo-fluidic simulation of complex ICs is very time consuming. Therefore, in this paper we propose a novel method for thermal simulation of ICs cooled by integrated microchannels...
Aluminium wires are widely used in power electronics modules to connect power semiconductor devices and other parts of the module electrically. Recently, other interconnect techniques have been proposed such as ribbon bond to improve the reliability, performance and reduce costs of power modules. The reliability of ribbon bond technique for an IGBT power module under power cycling is compared with...
The lifetime of power DMOS devices subjected to Thermal Induced Plastic Metal Deformation (TPMD) is highly dependent on the design of the metallization systems and thus requires the understanding of temperature, stress and strain distribution. This paper introduces and studies via numerical simulations with finite element method (FEM) a simple three dimensional (3D) transistor substructure commonly...
A unique hook-shaped conformal metal strip has been used to excite a cylindrical multilayer dielectric resonator antenna (DRA). By using the proposed unique feed and multi dielectric layers, a broadband circular polarization have been achieved over a bandwidth of ∼9.8% in conjunction with an impedance-matching bandwidth of ∼12.8% at same frequency range. The DRA has been successfully designed and...
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