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In order to improve the performance of underwater vehicle, the noise produced by underwater vehicle is studied. In this design, PXIe-6366 data acquisition module and computer are used as the main hardware. By mastering the application technology of virtual instrument, a noise data acquisition system with the functions of configuration, acquisition and data playback is designed. At the same time, the login module and user management module are designed to ensure the security and standardization of the system.

Submerged arc furnace, also known as electric arc furnace or resistance electric furnace, it is an industrial electric furnace with continuous operation and huge power consumption. It is mainly used for smelting calcium carbide, industrial silicon, ferrosilicon, silicomanganese, ferronickel, ferrochrome and other important modern industries. In order to solve the problems of the accuracy of length measurement in the submerged arc furnace and the difficulty of the upper computer to collect and process the acoustic signal, In this paper, the loss characteristics and propagation characteristics of the ultrasonic in the submerged arc furnace and the time-domain response characteristics of the RLC resonant circuit based on the magnetostrictive transducer under the excitation of the sinusoidal signal are optimized. The study found that in the under-damped response, the time for the magnetostrictive transducer RLC resonant circuit to reach the steady-state response has an exponential relationship with the external resistance of the resonant circuit. In other words, a suitable external resistance can be selected under the under-damped response. The external resistance value not only ensures that the time for the current to reach a steady state is less than 200us, but also ensures that the impedance of the loop is small enough to obtain a current that meets the requirements.

A new 27.5 kV rated vacuum circuit breaker with bi-stable permanent magnetic actuator is designed and developed on the basis of electromagnetic field analysis coupled motion. Firstly, the static characteristics of the permanent magnetic actuator are obtained using the finite element model with use of Ansoft software package. Next, the electrical circuit and mechanical models which describe the behavior of the circuit breaker are constructed using Matlab package. The dynamic characteristics are simulated on the basis of over static simulation. And results for the time variations of the coil current, the displacement of the contact system, move velocity and electromagnetic force are obtained. Finally, the testing plant is designed and the experiment is conducted in order to evaluate veracity of the simulation, it is indicated that simulation results coincide well with that of the experiment.

A laboratory-scale study of the treatment of printing and dyeing wastewater was carried out using the combined process of ABR and circulated moving carrier membrane bioreactor. ABR was maintained at a hydraulic retention time (HRT) of 8.5 hours and at a temperature of indoor temperature. The experiment is consisted of two parts: The fist section is that using amylum as sizing agent to inspect the reactor treat capability; When the influent COD was 1585 -5301 mg/L, the effluent COD was 42 mg/L overall 97% of COD removal. The average removal rates of COD, NH4-N, and color were 97%, 90%, 94%. The second section is that using PVA as sizing agent to inspect mainly on the effect of hydrolysis and acidgenisis of ABR and the organic removal effect of the system. Results showed that excellent effluent quality could obtained after the degradability of the refractory wastewater has been improved greatly in ABR.

An improved AOC algorithm aiming at the inefficiency of original AOC operations is proposed in this paper. After extraction of the level set of the lowest gray in foreground, area open (close) operation is carried out, whose result is then compared with the original image, resulting in the level set of next gray level. Iterative goes on in an order from low level to high one, until the final result is achieved. Experiment results show that this algorithm can remove lots of small regions earlier. It improved the efficiency obviously, preserving an equal effect of the original method.