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The aim of the paper is an improved mathematical model of Linear Switched Reluctance Motor including the effect of magnetic nonlinearities. The starting point for the model is the variation of the flux linkage with the current. This variation is analytically described using Fourier series. The final step is reserved to predict the dynamic performances of the LSRM. An analysis and comparison of these...
The structure of a novel hybrid excitation non-contact and low power consumption guiding system put forward and its operating principle is analyzed. The theory of equivalent magnetic circuit is used for deducing horizontal force. The relation of force, current, and displacement is got. The effect of the magnetic length of PM(permanent magnet) on the magnetic force is analyzed. The design result is...
The impacts between car to concrete pole occurred frequently in traffic accident, those accidents usually result in severe car damage and widespread power failure. In order to learn the dynamic response of car to concrete pole impact and fracture mechanics of concrete pole, a finite element model of vehicle-pole collision was developed and validated. Then, three impacts between car and concrete pole...
In the paper, the effects of magnetic saturation and damper winding currents on the unbalanced magnetic pull of synchronous generator were analyzed by using the Finite Element Method calculations. Analyses were conducted for no load and rated load conditions on two types of generators. Firstly on the 40-pole, 10,5 MVA, salient pole synchronous generator and then on 2-pole, 40 MVA turbo generator....
The operational efficiency of ultra fast actuators used as drives in high voltage direct current breakers are at best 5 %. To boost their efficiency, the design of the energizing circuit is crucial. A multi-physics finite element method (FEM) model coupled with a SPICE circuit model that is able to predict the performance of the actuator with an accuracy of at least 95 % has been developed and verified...
This paper presents an analytical model for the study of magnetic vibrations in a permanent magnet synchronous motor. The analytical model is based, for the magnetic aspect, on the magnetically coupled circuits approach widely used for modeling electrical machines under faults. This approach associated with the winding functions technique yields to a system of differential equations governing the...
Solenoid is an electromagnetically operated actuator. The classical solenoids employ armatures which are either flat or conical pole with various cone angles based on the force requirement. This paper describes a novel method of introducing surface features at an appropriate location in the solenoid geometry in order to reduce the reluctance in the working air gap and decrease the leakage flux which...
In real application, many important physical phenomena are sufficiently localized that adaptive finite element analysis methods are necessary. In the numerical solution of practical problems in engineering and physics such as in electromagnetic mechanics, the overall accuracy of numerical approximations often deteriorates due to local singularities like those arising from re-entrant corners of domains,...
In this study, a system for evaluating the wheelchair seating posture is introduced. The system consists of three subsystems: a seating posture changing system, a seating posture analysis system, and a propulsion analysis system. The seating posture changing system uses pneumatically controlled airbags installed in the wheelchair seat to change the posture of the patient and aims to generate a good...
In this paper the progress of Finite Element Method(FEM) based simulation of a deformable object in virtual reality is presented. Mass and stiffness matrix for FEM is calculated from meshed object which is generated from surface model for visualization. Deformation of the object is calculated from obtained matrices and external force at each time step and displayed in real-time. A simple cantilever...
In modern clinical practices, accurate orientation for needle-like tools inserting into soft tissues is cumbersome, mainly due to the tissue's non-linear deformation and the complicated combination of forces between the tissue and the tool. In this paper, the interaction between tissue deformation and friction forces has been discussed. We consider the relative velocity and contact length as the main...
In this paper, an estimation method using the flexible multi-body dynamics model, inertial/magnetic sensor system, and probabilistic state estimation is proposed for estimating the shape of a flexible cable.
In order to study how the Blank Holder Force (BHF), Die Radius and Drawbead (with or without) affect the stamping performance, this paper takes the automobile oil pan as the example, simulates the drawing procedure on Dynaform. And then analyzes the FLD (Forming Limit Diagram), Thickness or thinning figure and forming results. Finally, we get the optimal BHF and die radius.
The structural strength of the executive mechanism of excavator directly determines the whole performance, reliability and safety performance of the excavator. This paper aims to the executive mechanism, and establish the simulation model of excavator by using CAD and ANSYS. Then, the author simulates whole strength and single component strength of executive mechanism and analyze its strength change...
This research is an analysis of stiffener plate dimensions at the column base of the overhanging traffic sign post under effect on vehicle-induced gusts. The finite element analysis (FEA) result is compared with the result form computation using mathematical equation and an experimental result which cited from Fongsamootr T. and Chartpuk P. [2006]. It is found that the FEA result has deviation about...
Aimed at the problems of crack, wrinkle and springback caused by base metal different forming property of Tailor-Welded Blanks (TWBs) on two sides of welding line, the bending springback research on TWBs with different thickness which have transverse weld is carried out by the methods of combining numerical simulation with experiments. Based on optimized forming technology, the method of split blank...
Wave energy converter (WEC) detailed design and hydrodynamic analysis is unique, in some respects, because the analysis in dependent on the WEC's integral power-take-off (PTO) control which changes the physical properties of the device and the environment. This raises the complexity when using standard off-shore industry finite element analysis (FEA) tools. It is especially true of autonomous WECs...
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...
A molecular structural mechanics model, based on a link between molecular and solid mechanics, was built to evaluate mechanical properties of graphene nanoribbons (GNRs). This model can describe the true state of GNRs more realistically comparing to other simulation methods because of considering the structure and properties of the carbon-carbon bonds. GNRs with different edge types, such as armchair...
In this paper, based on the elastic-plastic finite element theory, the finite element model of expansion process for Solid Expandable Tubular is established, the axial length shrinkage, expansion force, residual stress and collapse strength after expansion are studied. According to the finite element simulaition results and practical experience, the optimum velocity of expansion cone is from 6 m/min...
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