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Two kinds of flat and stepped plates for ultrasonic radiators for the generation of high directional radiation in air are studied. The rectangular plate with free edges has no analytical solution. An approach for calculation of the directivity pattern of the sound radiated rectangular plate with free edges is developed based on the finite element method. It shows that the directivity pattern of the...
The radial instability of conductors of windings in large transformers becomes serious under multiple short-circuit conditions. The build-up effect of multiple short-circuit conditions cannot be simulated by the traditional analytical calculation. This paper presents a nonlinear buckling analysis method to compute and analyze the deformation of windings for a short-circuit test model transformer....
Because of its simple structure formation, the material is easy to take, and its convenient construction, low cost, simple technology, various forms, masonry structure has been widely used in multistoried buildings, schools, hospitals and other civil buildings, and is one of the most common structure form in enormous quantity and wide coverage building engineering. Due to masonry structure has some...
Bamboo has many good features, is an ideal material for the construction industry. The numerical simulation of multi-layer seismic frame structure of bamboo by hand shows that, for re-bamboo wood columns, typical of the two failure modes for the transverse deformation is too large can not continue to load and top of the fibers in the lateral pressure exploded, bamboo column can be restored in the...
Birefringence of asymmetric PCF is investigated using the finite element method, under the circumstance of perturbation. By comparing the value of birefringence on the different value of d2/d1, the results indicate that with the intrinsic-birefringence increasing, the little effect on birefringence regardless of the offset of hole-position or the variation of hole-diameter.
Fine blanking process on plane blank holder utilizes three tooling elements: a punch, a plane blank holder and an ejector to generate a highly compressive stress state and pure shearing forces to constraint the deformation of sheet metal within the narrow blanking clearance zone. Numerical simulation of fine blanking for steel 20 was performed using commercial FEM software DEFORM, and element deletion...
Energy loss occurs and heat is produced when giant magnetostrictive transducers transform electromagnetic energy into mechanical energy, this influences their working performances and lives, therefore, precise temperature field distribution computing is needed in designing. Magnetic field distribution of the giant magnetostrictive transducer is computed precisely by using the finite element method,...
In the paper,thermodynamic analysis of Jetta 2V engine exhaust manifold is done by finite element analysis method, temperature field and thermal stress is calculated, and the low cycle fatigue life of the exhaust manifold is assessmented by Manson-Coffin formula. Using ANSYS software to research the thermodynamics of the exhaust manifold, is overcomed the limitations of the classical method of calculating...
Combination of bionics principles, according to the structure of the human lung bronchus, the Jetta 2V engine exhaust manifold be biomimetic designed optimization, and use finite element software ANSYS CFD module FLOTRAN to analysis flow field and coupled thermal field for the original exhaust manifold and bionic exhaust manifold., comparing two kinds of exhaust manifold temperature field and flow...
The 3D model for the column module of the horizontal numerical control milling & boring machine was established. Using finite element software to analyze the structure stiffness, The strain trend of the column in the condition loaded is found and the analysis result is received. The validity was examined by measuring, This can provide effective ways for the enterprise to use analysis design in...
Based on the finite element method (FEM), this paper presented a technique for analyzing the vibro-acoustic coupling characteristics of bus passenger compartments. In view of sound quality of vehicle interior noises in the low frequency range, the acoustical, structural and coupled acoustic-structural FEM models of the passenger compartment of a sample bus are respectively established for modal, harmonic...
The temperature and fluid fields in a sense organ with different environmental temperatures are calculated by using Finite Element Method. The results are as follow: In a constant input of angular velocity, the temperature and fluid fields change with environmental temperature and fluid fields change with environmental temperature; The airflow rate difference of two detecting hot wires minishes with...
The sensitive mechanism of micro- machined airflow accelerometer is explained. Using the finite element method, the stream field by heat source, with different input accelerations, has been obtained. The numerical results are as follows: Without acceleration, the velocities of airflow at two thermistors are equal, so the current of both thermistors are also equal. The output of the bridge circuit...
The main function of top guard for excavator is to safeguard the lives and safety of the drivers when the vehicles encounter falling-object, it should have the lowest mass as long as it meets the performance standard. In order to improve the protection ability of protection structure for drivers and reduce manufacturing cost and design cycles, the optimization mathematical model is established, where...
The application of spectral element method in electromagnetics is developed in this paper. It is extensively used in the computing mathematics. In this paper, the EM scattering problem is discussed by spectral element method. The comparison is made between finite element method and spectral element method.
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