Applied Mechanics and Materials Vols. 496-500

Abstract: The combination of electrohydrodynamic and wind forms a new kind of power generation mode. Strong electric field induction charged method makes water mist form electrofluid to offer ions, and air pump offers wind. The experimental phenomenon is tested by oscilloscope. The oscilloscope waveform records the effects of wind. The results show that the wind power generator unit can make wind force overcome electric field force to convert wind energy into electricity.

Abstract: This work presents theory, design and simulation of an improved power amplifier based on the Doherty topology. It is theoretically shown that, by using multiple iterations of the source-pull and the load-pull in the platform of ADS with a Doherty power amplifier topology, the proposed amplifier can provide higher efficiency both at full output power and at back-off power, thus validating practical effects of the design and demonstrating a promising prospect of the design to be used in the future wireless transmitter applications.

Abstract: The advantages and development trend of automotive neodymium iron boron permanent magnet DC generator is summarized, analyzed the operation mode of neodymium iron Peng Yongci DC generator, and puts forward the neodymium iron boron permanent magnet DC generator has broad prospects for development. The design of the key parts of power system -- the neodymium iron boron permanent magnet DC generator, the excitation rotor and the armature winding parameters were designed to meet the needs of neodymium iron boron permanent magnet DC generator and improve the efficiency of the generator.

Abstract: The yarn tension is an important parameter to determine the product quality and production efficiency in winding process. Appropriate winding tension makes the winding bobbin form, which is a compact structure without damaging the physical and mechanical properties, is conductive to smoothly unwinding after the back working procedure.This paper makes analysis of The principle, composition and factors affecting the yarn tension of a winding machine, so as to control the yarn tension constancy of the yarn theoretical basis.

Abstract: This paper describes the classification of faults of hydraulic system, diagnosis method. And using the hydraulic system of machine tool to illustrate the common fault of hydraulic system and troubleshooting.

Abstract: In recent years, new personal and home hold Consumer Electronic Devices (CEDs) areemerging rapidly, such as smart phones, panel computers, and electronic vehicles. All of these CEDsare surely convenient for our daily lives, but users usually have a common feeling on the CEDs: thebattery cannot support the CEDS for long time working, which require charging the batteries withinonly several hours. Considering this urgent issue, this paper presented a solar battery structure with abigger capacity for consumer electronic devices. This battery consisted of four parts: solar panel part,energy management part, energy storage part and DC/DC converter part. Especially, a super-capacitorwas performed as the energy storage part, which was based on transmission line model. A simplesimulation was done for evaluating the performances of the proposed structure. The simulation resultsindicated that, the proposed battery structure had a bigger capacity and higher output power, whichwas more suitable for CEDs.

Abstract: Mechanical noise caused by power equipment vibration is the main source of underwater radiated noise of the ship, and vibration isolation and noise reduction of ship equipment has been widely concerned. Therefore,a vibration isolation system designed for four sets of auxiliary engine of ship cabin was investigated in the paper, aimed to further reveal the influence of various parameters including floating raft shell thickness, excitation source, and different ship hull and installation platform thickness on the vibration level difference of system. The results obtained from numerical analysis using MSC software and experiment indicate that one-dimensional spring element simplified can properly simulate the actual rubber vibration isolator on low frequency bands, and increasing thickness of flat, hull and platform can improve the effect of vibration isolation obviously.

Abstract: The buffering airbag is one of the most important technologies for the landing impact attenuation of dropped equipments. A designed simplified airbag had been used to study cushion characteristics of self-inflating buffering airbag based on experimental method. Every possible combination of factors and factor levels was considered in the experiment. The influence factors of cushion characteristics were researched through the results. The results show that acceleration and pressure inside the airbag are affected by the initial landing velocity, mass of the load and the initial state of vent orifices. Then the simulation model of airbag was established and validated by experimental results. The simulation results agree very well with the experimental results. The established model can be used for further research of cushion characteristics.

Abstract: To obtain reliable test data of ventilator vibration and overcome defects of the traditional vibration test methods such as complicated instruments, low reliability, high costs and so on, the vibration measurement and analytical system for ventilator is established based on the virtual instrument technology using circulating cooling circuit, advanced accelerometers and signal acquisition. The program for acquisition and process procedure of vibration data are compiled with LabVIEW which is the graphical and modular programming language. The structure, function, design idea and theoretical basis of hardware and software systems for the test are described respectively. It proves that this system is more accurate and practical than conventional vibration meter.

Abstract: Water system is one of the significant compositions with large power consumption in air-conditioning equipment. From viewpoint of energy-saving, the variable frequency operational principle of the water system is analyzed, the merits and demerits of operating water system under power frequency or variable frequency are compared, and the control principle of the energy-saving revamping project is introduced. In addition, combining with the specific project, the benefit of energy-saving for the water system is analyzed. The result shows that after revamping, the air-conditioning system runs properly, both the indoor temperature and humidity meet the specifications; the revamping technology offers significant energy-saving effects.