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This research investigated the effects of three different drawbead shapes under three blankholder forces on the non-symmetrical deep drawing metal workpiece. In the study, simulations were carried out on three grades of cold rolled steel sheets (i.e. SPCC, SPCD and SPCE) using the finite element method (FEM) and the actual experimentations performed for comparison. The experimental drawbead shapes...
Hybrid forging combines forming of bulky and sheet metal elements in one process step. During the forming of the bulky and sheet metal elements a joining operation is initiated by the energy provided by the forging operation. Thereby component areas with high loads can be designed using a bulky element whereas areas with lower loads can be designed using a sheet metal element. In consequence, significant...
This paper presents a monolithic opto-coupler based force sensor design to detect the contact forces of the fingertip of the artificial hand during grasp process. Effective and precise measurement of the contact force is always a challenge for the humid and temperature varying environment. In this paper, we propose a novel design of force sensor with optical technique. The optical technique is preferred...
Obtaining the force condition of the polishing manipulator in polishing process of the robot is the key technology to polish the wheel hubs automatically and intelligently. If the technology can be effectively addressed, the level of industrialization will be improved significantly. A new type of six-axis force/torque sensor is presented in the paper with overload protection and decoupling of force...
This paper investigates a bridge-type compliant mechanism with elliptical shell for amplified piezoelectric actuators. Compared with the traditional bridge-type mechanism using the notch flexure hinges, this kind of mechanism has advantages of high stiffness, low stress and high resonant frequency. An analytical model for the calculations of displacement amplification ratio and input stiffness is...
In this paper, a double stator linear rotary permanent magnet motor (DSLRPMM) which has a long tuber ferromagnetic mover core with permanent magnets (PMs) arranged on inner and outer surfaces is presented. Based on 3D finite element method (FEM), the end effects caused by the finite length of the inner and outer stators are investigated. The relationships between the end effects and motor parameters,...
In this paper, a new thin yoke modular linear flux-switching permanent magnet (TYMLFSPM) machine with fault-tolerant capability is proposed. The analysis for the proposed TYMLFSPM machine is carried out by the finite-element method. The ratio of mover pole pitch to stator pole pitch is optimized to increase the thrust force and thrust force density.
An analysis of electro-magnetic variables' effects of a balanced-armature driver on total harmonic distortion in multi-physics by using finite element method and boundary element method while considering the mechanical-acoustic coupling effect and electromagnetic-mechanical coupling effect is proposed, and the optimal design values are identified by using response surface methodology.
The inductive assemblies with variable geometry have recently been proposed for potential electromagnetic (EM) energy harvesting utilization. Such inductors are capable of changing their initial geometry under the influence of some external force, collecting additional magnetic flux and producing increased induced voltage. In order to evaluate performance of such inductors, regarding increase of its...
A novel E-core transverse-flux permanent magnet linear motor (TFPMLM) is proposed in this paper. Firstly, the operational principle and structural advantages of the TFPMLM are presented. Then it is simplified equivalently to one that can be resolved by Schwarz-Christoffel (SC) transformation to obtain its no-load characteristics such as flux density, PM flux linkage and cogging force instead of time-consuming...
Non-skewed rotors can be used to eliminate the slot harmonic field, as well as, the noise and vibration can also be weakened effectively. However, it is difficult to determine the spatial distribution of the asymmetrical rotor bars and slot combinations, which can affect the loss and air-gap force significantly. Taking a 5.5kW, 4-pole induction motor as an example, this paper studies the influence...
The main purposes of this paper consist of two parts: Firstly, the geometric topology and operation principle of a novel outer-rotor-permanent-magnet flux-switching (ORPM-FS) machine is proposed and simply introduced. Secondly, based on 2D finite element method, phase back electromotive force (back-EMF) waveform of the ORPM-FS machines with different combinations of stator slots and rotor poles is...
The relation between a growing root and the soil movement has often been under-estimated. The present work aims to determine how grains in granular soils are reorganized by the action of growing roots, and in turn how the resulting forces acting on root tips modify their development. For this purpose, we have developed a 2D Discrete Element Model (DEM) able to compute a numerical growth of a single...
Multi-physics coupled FEM model is developed for evaluating contact degradation of gas insulated bus (GIB) plug-in connector under short circuit current impact. Contact spring is assumed as elastic spring element and contact spot is simulated by contact bridge model. Thermal/mechanical characteristics of plug-in connector with typical assembly conditions (conductor insert depth/angle) under short...
The semi-high-speed magnetic levitation (Maglev) train currently being developed in Korea uses linear induction motors (LI Ms) for thrust. LI Ms have very high operation reliability and relatively low production costs. However, when applied to Maglev trains, their operation efficiency is lowered because of the large air gaps. Therefore, this paper analyzes in detail the driving force, normal force,...
Passive compliant prosthetic ankles have the advantage of energy saving, light weight, simple structure and competitive cost compared to powered devices. Despite of the variety of commercial products, these designs do not provide adequate degree-of-freedom during amputees' movement. It hampers them from walking comfortably especially on undulating and rough terrains. This paper presents a novel design...
In this paper is proposed an optimized solution of DC electromagnet using design of experiments (DOE) and FEM. Before optimization, the technique of screening was applied to determine the most influent geometrical parameters on the static force characteristic. For this purpose, the response function was chosen to be the root square of the average of squares of the relative force for five values of...
Double Linear Damage Rule (DLDR) is commonly used in analyzing cumulative fatigue damage. Compared with the Linear Damage Rule (LDR), the DLDR takes into account the long established fact that order of loading significantly affects the summation of the cycle ratios at failure. This paper presents a method for calculating the fatigue life, by analyzing the actual load spectrum of a certain type of...
This article is devoted to the application of the method for optimal design of the shell-type electromagnets based on the solving inverse problems of stationary magnetic field theory by finite element method and on the transformation of constraints on magnetic induction and a tractive force in the objective functions. Minimization of these objective functions is performed by gradient descent numerically...
Haptic rendering of soft bodies is essential in medical simulations of procedures such as surgery or palpation. The most commonly used approach is to recreate the sense of touch using a specific design and control of a robotic arm. In this paper, we propose a new approach, based on soft-robotics technology. We create a tangible deformable device that allows users to “touch” soft tissues and perceive...
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