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Thin-walled structures are now widely used in aerospace structural components, turbines and many other applications, while the control of machining distortion has become one of the most difficult problems influencing their machining quality. Machining distortion is the result of many factors, among which the machining induced residual stress is an important issue. In this paper, a finite element analysis...
High-resolution peripheral quantitative computed tomography (HR-pQCT) is a promising in vivo imaging technique that can be used to assess the three-dimensional microstructure of the radius and tibia. Micro finite element models can also be constructed from these images to estimate the mechanical competence of these sites, giving this technique the potential in the clinical diagnosis of osteoporosis...
The physics-based phase variable model of permanent magnet synchronous machines is developed for the simulation study of machine control. The parameters of the physics-based phase variable model, inductances and flux linkages are calculated from the solutions of nonlinear FE computation covering a complete AC cycle to consider the geometry details, the rotor position, the armature currents, and the...
This paper presents an approach to realize an equivalent hardware representation of PM synchronous machines through a physics-based machine model for hardware-in-the-loop simulation of PWM drives. The equivalent hardware representation of the machine is achieved using a controllable load. The load current is controlled to be the same as the currents obtained over the physics-based model of the machine...
This paper presents an experimental approach for the verification of the physics-based phase variable model of electric machines developed using the parameters obtained from FE solutions. The experimental verification was performed through simultaneous simulation of the PM machine drive using the actual machine - a hardware-in-the-loop real time simulation approach and the physics-based phase variable...
In this paper, a high frequency physical phase variable model of electric machines is presented. The proposed model is composed of a low frequency phase variable model and a high frequency winding branch connected in parallel. The high frequency winding branch is used to include the distributed effects appearing at high frequency operation while the low frequency phase variable model captures the...
The efficiency and reliability of solid-state lighting devices strongly depend on successful thermal management. High-brightness light emitting diodes (LEDs), as a strong candidate for the next generation general illumination applications, were developed by improving luminous efficiency and integrating multi-chips within limited areas. One of key problems is cooling in developing high power LED for...
This paper presents the development of the FE-based physical phase variable models for electric machines. Our results show that the developed FE-based phase variable models provide the same accuracy as the full FE model but with much faster simulation speed. These models are necessary for the study of new control strategies to facilitate dynamic simulation in an industrial environment. The FE-based...
This paper studies the development of physical circuit models of single phase transformers based on FE analysis. We have proposed a practical method to build the circuit model from FE solutions for dynamic simulations. The developed circuit model produced the accuracy of the full FE model without the need for excessive number of FE computations. The variation of flux linkages with winding currents...
An improved FE-based phase variable model for PM synchronous machines is developed. The developed model can be used dynamically for motor control applications. Previous models, developed earlier by these authors, consider the rotor position dependence of the inductances and the flux linkage due to the permanent magnets. In the improved model, the effect of core loss as well as its variation with the...
In this paper, an accurate circuit model is proposed for single phase distribution transformers with internal winding faults. The model is developed based on flux linkages. An equivalent excitation current variable im is defined. The variation of psi(im) with the winding currents is used to describe the nonlinear magnetization, which are obtained from FE solutions. With such a method, the circuit...
This paper presents a simulation method for studying the fault diagnosis of electric machines. The internal short circuit fault of PM machines is used as an example. A FE-based phase variable model is proposed to describe the PM machines with internal short circuit faults. The FE-based model is built using the solutions obtained from the FE modeling of the machine with the same fault. Such a model...
High frequency model of permanent magnet synchronous motor is developed considering all the turns in the winding. Finite element analysis is used for accurate determination of winding parameters such as resistance, inductance and capacitance at high frequency of operation. From these calculated parameters lumped model is built for high frequency winding branch. Matrix reduction technique is applied...
The inverse magnetostriction effect (IME) is investigated for noise generation, identification and evaluation in shipboard propulsion machinery applications. The finite element (FE) implementation is performed on an example drive motor in two dimensions. The FE implementation results show an increase in the forces acting on the ferromagnetic region causing more deformation in the stationary core center...
This paper describes design considerations for a short-stroke high-dynamic linear actuator to be used as valve actuator in automotive applications, including the determination of actuator topology and geometry parameters, the force and dynamic calculations using finite element method and the controller design. Special aspects concerning the practical realization are discussed. Furthermore, results...
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