Search

Based on elastic good for beryllium bronze material making sensitive vibrating components of accelerometer, and developed the capacitance the capacitance sensitive type of accelerometer. Then designed a kind of detection circuit, which can be used to detect differential capacitance signal. Gives the electronic components used in the circuit, through analyzed for solving, then giving the direct proportion relation between the output voltage of the circuit and the sensor signal pickup the capacitance variation. The experiment shows that the sensitivity of accelerometer is about 391.12mV/(m/s2).

In order to reduce the influence of the harmonics of the air-gap magnetic field on PMSM performance, in this paper, the method which is to add auxiliary grooves in the rotor surface is proposed to optimize the air-gap magnetic field of PMSM and reduce the iron loss, torque ripple and noise-vibration caused by the harmonics. During the process, the orthogonal experimental method and the time-stepping FEM were used to optimize the structure of the grooves. Analyzed and compared the test-data and the calculated data,it shows that this method can largely improve motors performance.

This paper is about a kind of instrument which can detect the fault object by acoustic sensor detecting the object Surface acoustic signals, through the analysis of the acoustic signal of the intensity and frequency content, so determining the object if abnormal conditions occur. Design by using Piezoelectricity material as the sensing head, the signal processing circuit is based on SH79F32 microcontroller as the core, the single-chip microcomputer, integration with ADC, the analog signal from the sensor to convert them into digital signals, in the procedure, carries on processing to the signal frequency components, filter out low-frequency components, acoustic signal was finally measured on a screen display. including hardware design, production, processing, software programming, to obtain the acoustic fault detector, and to test its performance, results show successful.

By modeling for the energy conservation and pollutants emission reduction of subway, the paper takes the subway as an electricity-replacing-oil strategy .Compared with the road oil consumption transportation, subway proves to be efficient in energy saving and environmental protection. It also has a large potential in further improvement.

The influences of water content on corrosion behavior of grounding steel in semi-desertification soil were studied by polarization curve technique and weightlessness method.The tested specimen surface was characterized by scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),and X-ray diffraction(XRD).The experiment results show that moisture has a great influence on corrosion of steel,the corrosion rate of 20 steel increased to a maximum at a value and then decreased.To anslysis the formation mechanism of soil corrosion products.

Over-concentrated load added the generator start-stop frequency and energy consumption, being harmful to the generator running efficiently and economically, dignifying the security and stability of the electricity system. Based on the time-of-use(TOU) price mechanism, this paper suggests superstores take advantage of energy-storage equipment to transfer load and proposes a decision-making model of air-conditioning options. By comparing the costs of the ice-storage air-conditioning with the regular air-conditioning, we find the ice-storage air-conditioning shows much contribution to the power net stability, to energy saving and to the cost decreasing of the superstores.