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1. Electromagnetic Performance Analysis of Axial Field Flux-Switching Fault-Tolerant Machine Using Equivalent Magnetic Circuit Method | |||
LIN Mingyao,XU Da | |||
Dynamic and Electronic Engineering 26 May 2016 | |||
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Abstract:In this paper, the electromagnetic performances of a novel axial field flux-switching fault-tolerant (AFFSFT) machine are investigated based on equivalent magnetic circuit (EMC) method. A nonlinear EMC model of the AFFSFT machine is proposed and built, and the static characteristics of the machine, including the air-gap flux density, permanent magnetic flux linkage, back electromotive force (EMF) and inductance characteristics are analyzed. The calculated results are compared with those predicted by finite element method (FEM). Experiments are done with a prototype. The analysis results are consistent with the experimental results well, verifying the feasibility of the EMC method. | |||
TO cite this article:LIN Mingyao,XU Da. Electromagnetic Performance Analysis of Axial Field Flux-Switching Fault-Tolerant Machine Using Equivalent Magnetic Circuit Method[OL].[26 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4694064 |
2. EXPERIMENTAL STUDY ON LOCAL SUBCOOLED FLOW BOILING HEAT TRANSFER IN A VERTICAL MINI-GAP CHANNEL | |||
Li Junye,Feng Zhaozan,Li Wei,Zhou Kan | |||
Dynamic and Electronic Engineering 20 May 2016 | |||
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Abstract:An experimental study of subcooled flow boiling in a high-aspect-ratio, one-sided heating rectangular mini-gap channel was conducted using deionized water. The local heat transfer coefficient, onset of nucleate boiling, and flow pattern of subcooled boiling were investigated. The influence of heat flux and mass flux were studied with the aid of a high-speed camera. The results show that the flow pattern was mainly isolated bubbly flow when the narrow microchannel was placed vertically. The bubbles generated at lower mass fluxes were larger and did not easily depart, forming elongated bubbly flow and flowing upstream. The thin film evaporation mechanism dominated the entire test section due to the elongated bubbles and transient local dryout as well as rewet. The local heat transfer coefficient near the exit of the test section was larger | |||
TO cite this article:Li Junye,Feng Zhaozan,Li Wei, et al. EXPERIMENTAL STUDY ON LOCAL SUBCOOLED FLOW BOILING HEAT TRANSFER IN A VERTICAL MINI-GAP CHANNEL[OL].[20 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4691865 |
3. HEAT TRANSFER CHARACTERISTICS OF DOWNWARD SUPERCRITICAL KEROSENE FLOW IN MINITUBES | |||
Lin Jinpin,Zhang Jingzhi,Zhou Kan,Li Wei | |||
Dynamic and Electronic Engineering 20 May 2016 | |||
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Abstract:The heat transfer characteristics of supercritical China RP-3 aviation kerosene flowing downward in a vertical circular tube are numerically investigated. A ten-species surrogate model is used to calculate the thermophysical properties of kerosene and the Re-Normalization Group (RNG) k-ε model with the enhanced wall treatment is adopted to simulate the turbulent flow. The effects of diameter, wall heat flux, and pressure on temperature and heat transfer coefficient are studied. The numerical results show three types of heat transfer deterioration exist along the flow direction. The first deterioration at the tube inlet region is caused by the development of the thermal boundary layer, which exist whatever the operation condition is. The second and third kind of deterioration take place when the inner wall temperature or the bulk fuel temperature approaches the pseudo-critical temperature under a pressure close to the critical value. The heat transfer coefficients increase with decreasing diameter and increasing pressure. The increase of inlet pressure can effectively eliminate the deteriorations because the thermophysical properties change less near the critical point at higher pressure. The decrease of wall heat flux will delay the onsets of the second and third kind of deterioration. The numerical heat transfer coefficient fit well with the empirical correlations | |||
TO cite this article:Lin Jinpin,Zhang Jingzhi,Zhou Kan, et al. HEAT TRANSFER CHARACTERISTICS OF DOWNWARD SUPERCRITICAL KEROSENE FLOW IN MINITUBES[OL].[20 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4691841 |
4. A Methodology of Iron Loss Calculation for Permanent Magnet Linear Synchronous Machine | |||
Xu mingfei,Hu Minqiang,Yu Haitao | |||
Dynamic and Electronic Engineering 07 December 2015 | |||
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Abstract:In order to calculate the iron loss of PMLSM, a novel methodology based on FEA, 8 fast Fourier transformation and fuzzy computation was proposed. The mathematical model of linear motor was established, including the flux linkage equation and voltage equation, electromagnetic thrust equation so that PMLSM is well understood. Then 5 steps were taken to resolve the problem of iron loss, and the calculation method for 8 fast Fourier transformation and fuzzy computation was researched in this paper. Simulation and calculation was performed to calculate the iron loss, 8FFT can greatly improve the computing speed and calculate harmonic content firstly. Secondly, fuzzy calculation has greatly improved the intelligence and accuracy of the calculation for iron loss. Finally, the figures of iron loss show that the iron loss rises as the force ranges from 10N to 80N. In addition, the iron loss also rises greatly as the frequency ranges from 5 to 500Hz for different force. | |||
TO cite this article:Xu mingfei,Hu Minqiang,Yu Haitao. A Methodology of Iron Loss Calculation for Permanent Magnet Linear Synchronous Machine[OL].[ 7 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4667771 |
5. A Comparison Study of Hydrogen Bond in Poly(vinyl alcohol) aqueous solutions: DMSO, Ethanol, Ethylene Glycol and Glycerol | |||
CHEN Cong | |||
Dynamic and Electronic Engineering 30 November 2015 | |||
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Abstract:In this paper, molecular dynamics simulations have been performed on poly(vinyl alcohol)-cryoprotective agent solutions. Four cryoprotective agents (CPA) were selected: DMSO, ethanol, ethylene glycol and glycerol. Hydrogen bonds were analyzed based on a geometrical criterion. The results showed that the number of hydroxyl groups in CPA molecules had a great impact on hydrogen bonding structure of PVA-CPA aqueous solutions. | |||
TO cite this article:CHEN Cong. A Comparison Study of Hydrogen Bond in Poly(vinyl alcohol) aqueous solutions: DMSO, Ethanol, Ethylene Glycol and Glycerol[OL].[30 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4667041 |
6. The pulse exciting source and its application in electromagnetic acoustic emission | |||
Zhang Chuang,Li Fubiao,Liu Suzhen,Cai Zhichao,Xiao Yang | |||
Dynamic and Electronic Engineering 29 October 2015 | |||
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Abstract:Electromagnetic loading in the metal structures will produce stress wave signal at the edge of the crack and this phenomenon can be used in nondestructive testing of metal defects. As the core of electromagnetic load, the output parameters of the exciting source, such as current frequency and amplitude, have a significant impact on loading effect. For the loading demand of the electromagnetic acoustic emission (EMAE), using the energy storage of the capacitor, the pulse high current which the EMAE needs can be achieved by capacitor discharging instantaneous. It designs the adjustable regulated power supply based on semi-bridge switching circuit principle. The parameter display and adjustment module can be achieved based on the single-chip system. Applying to the EMAE experiment, it can reach the expected target.????? | |||
TO cite this article:Zhang Chuang,Li Fubiao,Liu Suzhen, et al. The pulse exciting source and its application in electromagnetic acoustic emission[OL].[29 October 2015] http://en.paper.edu.cn/en_releasepaper/content/4659531 |
7. Self-Constructing Feedback Fuzzy Neural Network based PMLSM Controller Design | |||
ZhangRu | |||
Dynamic and Electronic Engineering 24 April 2015 | |||
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Abstract:Self-constructing feedback fuzzy neural network controller (SCFFNNC) is designed to aim at the parameter uncertainties for permanent magnet linear synchronous motor (PMLSM) since they cause negative influence to the dynamic performance of PMLSM servo system. The thought about self-constructing, in which the number of neurons for the whole structure can be able to increase on line according to the variety of error, is introduced based on combining the non-linear identification of fuzzy control with self-learning of neural network. It can reserve the self-learning abilities, improve the real-time performance for neural network and then enhance the dynamic performance of PMLSM. The simulation results show that the servo system for PMLSM based on SCFFNNC can realize quick response, high precision and strong robustness for the parameter uncertainties of PMLSM. | |||
TO cite this article:ZhangRu. Self-Constructing Feedback Fuzzy Neural Network based PMLSM Controller Design[OL].[24 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4640459 |
8. High Frequency ZVZCS Resonant Inverter for High-Power HPS Lamps | |||
Yifeng Wang,Yun Zhang | |||
Dynamic and Electronic Engineering 06 January 2015 | |||
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Abstract:For the low-voltage and high-current output requirements of high-power and high-pressure sodium lamps (HPS), the paper presents a CLCL resonant inverter, to achieve zero-voltage and zero-current switching (ZVZCS) and sine wave output through resonance. The working principle for the new circuit was presented, based on achieving the soft switching conditions for the inverter switches. Then an optimization design method was investigated in this paper, which made the minimum voltage stress on the resonant components in ZVZCS condition. The theoretical and simulation results of the newly designed circuit show that all the switches work in the ZVZCS state. Besides, we got a sine waveform current output, which efficiently reduced the crest factor of the current and extended the life of the lamp. To examine the correctness of the proposed method, finally, we designed a DC-AC resonant inverter with 400V input, 100V/10A output, and 260 kHz switching frequency. The experimental result sustained the proposed configuration and the full load efficiency of the inverter can achieve 99.1% | |||
TO cite this article:Yifeng Wang,Yun Zhang. High Frequency ZVZCS Resonant Inverter for High-Power HPS Lamps[OL].[ 6 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4626699 |
9. The effect of ignition delay period on heat release of hydraulic free piston engine | |||
ZHANG Shuanlu,ZHAO Changlu,ZHAO Zhenfeng | |||
Dynamic and Electronic Engineering 19 December 2014 | |||
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Abstract:The special characteristic of hydraulic free piston diesel engine decides its differences in the aspects of piston displacement, velocity, and acceleration etc. These differences lead to more complex fluid flow, and particular intrinsic energy distribution in-cylinder. All these factors results in the differences of heat release. This article shows the heat release rate difference between the start cycles and the stable cycles and deems that the difference is related with the ignition delay period. From the expression equation of ignition delay period, the reason is ascribed to the boundary temperature. Based on selection of several cycles, we study the maximum value of heat release rate and pressure in-cylinder and it is obvious that the ignition delay period affects the heat release rate, pressure and BDC position. Finally, the corresponding optimum proposals for decreasing the difference are also represented. | |||
TO cite this article:ZHANG Shuanlu,ZHAO Changlu,ZHAO Zhenfeng. The effect of ignition delay period on heat release of hydraulic free piston engine[OL].[19 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624354 |
10. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field | |||
LI Pengcheng,PEI Pucheng,HE Yongling,ZHANG Hongfei | |||
Dynamic and Electronic Engineering 27 February 2013 | |||
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Abstract:The stoichiometric ratios and related regimes, which can promote anti-flooding of polymer electrolyte membrane fuel cell (PEMFC) with in-plate adverse-flow flow-field (IPAF), were investigated in this paper. Two flow combinations, which are the simple and complex adverse-flow between plates (ABP) that can be realized by IPAF, were employed to investigate. Constant stoichiometric ratios examination indicates that the complex ABP could improve anti-flooding of PEMFC better in the medium (greater than 200mA/cm2 and less than 1000mA/cm2) and high (greater than 1000mA/cm2) current densities than the simple ABP. More stoichiometric ratios were introduced to find the cathode critical stoichiometry. Under the condition of cathode critical stoichiometry, the maximal local relative humidity of both electrodes of complex ABP is equal to 100% and below while the anti-flooding of the cathode of simple ABP is not satisfactory in the medium and high current densities. Further study shows that the mechanism of fuel cell, which is the interdependence between the electrodes effect, can make significant contribution to anti-flooding. | |||
TO cite this article:LI Pengcheng,PEI Pucheng,HE Yongling, et al. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field[OL].[27 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4524116 |
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