R&D of a Foldable Obstacle-Striding Electromagnetic Coilgun

2014 ◽  
Vol 543-547 ◽  
pp. 633-636
Author(s):  
Zhen Yu Wang ◽  
Yun Peng Zhu ◽  
Xiong An ◽  
Er Li Sheng
Keyword(s):  
Kinetic Energy ◽  
Permanent Magnet ◽  
Operating Performance ◽  
Tall Building ◽  
Central Collision ◽  
Induction Coil ◽  
Fire Fighting ◽  
Building Fire ◽  
Late Model

Electromagnetic coilgun and obstacle-striding mechanism are creatively integrated into the foldable obstacle-striding electromagnetic coilgun. According to the theorem of kinetic energy, permanent magnet NdFeB is used as a collisional armature to accelerate the projectile through a central collision. Meanwhile, structures such as shaft in shaft mechanism are designed. Both of the late-model mechanisms make the physical overall structure simple, compacted, and better capable of obstacle striding and operating performance. The testing results and operating performance of this late-model foldable obstacle-striding electromagnetic coilgun appear to be excellent through observing and analysing the results of experiments. It can successfully cross stairs, steps and other usual obstacles. If the stage and the number of turns of induction coil are increased, with safety protecting device, this equipment will be able to put into practice further in particular fields, for instance, military, anti-terrorism, tall building fire fighting and so on.

Modeling and Design of Permanent Magnet Vibration-to-Electrical Power Generator’s Induction Coil

2012 ◽  
Vol 588-589 ◽  
pp. 614-617
Author(s):  
Zhi Hua Wang ◽  
Mei Ling Li ◽  
Jian Zhang ◽  
Li Wang ◽  
Yong Xu
Keyword(s):  
Permanent Magnet ◽  
Electrical Power ◽  
Induction Coil ◽  
Test Results ◽  
Coil Design ◽  
Sinusoidal Vibration ◽  
Electrical Generator ◽  
Simulation Results ◽  
Peak Value

The Equivalent Turn Number of Coil (ETNC) is proposed for induction coil design. Simulation results show that the vibrationonthe induction coil’s structure. The optimized coil is composed by two symmetry parts on the condition of sinusoidal vibration. The effective value of output EMF of optimized coil increases 51.39% than uniform coil’s. In the experiment, the optimized and uniform coils are fabricated with 600 turns and comparatively studied in the same vibration-to-electrical generator. The test results show that the peak-to-peak value and effective value of output EMF of the optimized coil can increase up to 52.59% and 48.76%, respectively, compared with the uniform coil.

scholarly journals Large-eddy simulation of turbulent flows over an urban building array with the ABLE-LBM and comparison with 3D MRI observed data sets

2020 ◽  
Author(s):  
Yansen Wang ◽  
Michael J. Benson
Keyword(s):  
Boundary Layer ◽  
Kinetic Energy ◽  
Large Eddy Simulation ◽  
Atmospheric Boundary Layer ◽  
Validation Study ◽  
Tall Building ◽  
Turbulent Wind ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Building Array

Abstract In this article we describe the details of an ABLE-LBM (Atmospheric Boundary Layer Environment-Lattice Boltzmann Model) validation study for urban building array turbulent flow simulations. The ABLE-LBM large-eddy simulation results were compared with a set of 3D magnetic resonance image (MRI) velocimetry data. The ABLE-LBM simulations used the same building layout and Reynolds numbers operated in the laboratory water channel. The building set-up was an evenly spaced orthogonal array of cubic buildings (height = H) with a central tall building (height = 3H) in the second row. Two building orientations, angled with 0°and 45° wind directions, were simulated with ABLE-LBM. The model produced horizontal and vertical fields of time-averaged velocity fields and compared well with the experimental results. The model also produced urban canyon flows and vortices at front and lee sides and over building tops that were similar in strength and location to the laboratory studies. The turbulent kinetic energy associated with these two wind directions were also presented in this simulation study. It is shown that the building array arrangement, especially the tall building, has a great effect on turbulent wind fields. There is a Karman vortex street on the lee side of the tall building. High turbulent intensity areas are associated with the vortex shedding motions at building edges. In addition, the wind direction is a very important factor for turbulent wind and kinetic energy distribution. This validation study indicated that ABLE-LBM is a viable simulation model for turbulent atmospheric boundary layer flows in the urban building array. The computational speed of ABLE-LBM using the GPU has shown that real-time LES simulation is realizable for a computational domain with several millions grid points.

scholarly journals Applying Closing Phase-Angle Control Technique in Bounce Reduction of AC Permanent Magnet Contactor

2009 ◽  
Vol 2009 ◽  
pp. 1-12 ◽  
Author(s):  
Chieh-Tsung Chi
Keyword(s):  
Kinetic Energy ◽  
Permanent Magnet ◽  
Phase Angle ◽  
Laboratory Testing ◽  
Low Cost ◽  
Control Circuit ◽  
Control Technique ◽  
Electronic Control ◽  
Operating Reliability

A new low-cost electronic control circuit actuator is proposed for minimizing the bouncing times of an AC permanent magnet (PM) contactor after two contacts closing. The proposed new actuator overcomes the bouncing problem of an uncontrollable restrictions imposed by previously conventional AC electromagnetic (EM) contactor based on the minimization of kinetic energy prior to two contacts impact. By choosing the closing phase angle of coil voltage on purpose, the bouncing problems of the movable contact during the closing process are then overcome. The using life of contacts is then prolonged and their operating reliability is improved as well. In order to validate the feasibility and effectiveness of the proposed method here, several simulation and experimental procedures were performed on a prototype of AC PM contactor in the laboratory. Testing results actually showed that bouncing problem of contactor's contacts during the closing process was to be controlled by using the proposed technology.

scholarly journals Operating Performance of Pure Electric Loaders with Different Types of Motors Based on Simulation Analysis

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 617
Author(s):  
Xuefei Li ◽  
Chao Duan ◽  
Kun Bai ◽  
Zongwei Yao
Keyword(s):  
Permanent Magnet ◽  
Hydraulic System ◽  
Simulation Analysis ◽  
Permanent Magnet Synchronous Motor ◽  
Operating Performance ◽  
Synchronous Motor ◽  
The Other ◽  
Hydraulic Systems ◽  
Switched Reluctance Motors ◽  
Switched Reluctance

The electrification of loader designs can utilise several power motor types. Hence, this study investigates the operational performance of pure electric-powered loaders matched with three types of motors. Firstly, for the ZL08 loader, it is proposed that a pure electric-powered loader structure adopts two motors to drive the walking and hydraulic systems separately. Secondly, the dynamic parameters of the two motors were matched, and then, a joint vehicle dynamics model of the control system, the Multi-Body Dynamics (MBD) module and the material Discrete Element Method (DEM) module, was established. Finally, the performance of the walking system with three motors was tested by inserting three materials and using accelerating and climbing methods. The operating performance of the hydraulic system was tested by shovelling and unloading three materials. Results show that when inserting difficult materials, the loader’s walking system with switched reluctance motors is 9.74–21.2% deeper than that with the other two motors and 11.7–56.2% faster at the same depth. The hydraulic system consumes 3–15.7% less energy when matched with a permanent magnet synchronous motor than the other two motors. Pure electric loaders have the best operating performance when the walking system is matched with a switched reluctance motor, and the hydraulic system is matched with a permanent magnet synchronous motor.

scholarly journals Torque for an Inertial Piezoelectric Rotary Motor

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Jichun Xing ◽  
Lizhong Xu
Keyword(s):  
Kinetic Energy ◽  
Dynamic Equation ◽  
Strain Energy ◽  
Operating Performance ◽  
Theory Analysis ◽  
Peak Voltage ◽  
Motor Torque ◽  
Excitation Signal ◽  
Driving Torque ◽  
Rotary Motor

For a novel inertial piezoelectric rotary motor, the equation of the strain energy in the piezoceramic bimorph and the equations of the strain energy and the kinetic energy in the rotor are given. Based on them, the dynamic equation of the motor is obtained. Using these equations, the inertial driving torque of the motor is investigated. The results show that the impulsive driving torque changes with changing peak voltage of the excitation signal, the piezoelectric stress constant, the thickness of the piezoceramic bimorph, and the rotor radius obviously. Tests about the motor torque are completed which verifies the theory analysis here in. The results can be used to design the operating performance of the motor.

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