Advanced Materials Research Vols. 179-180

Abstract: This paper based on traditional ip, iq examination's method , introduces one kind of non-phase-locked loop's ip, iq method. this method avoids the mains frequency displacement the influence, causes the examination to be more conveniently. With the MATLAB simulation of software, obtain the satisfactory results, thus proving the usefulness of this method.

Abstract: When the TCSC steady-state operation, the thyristor turn-on and turn-off time is definite, the changing for TCSC electric capacity voltage and thyristor electric current is with the periodicity and symmetry.Thyristor controlled series compensation technology is fixed series compensation technology foundation, which is meet the needs for adaptation electrical power system operation control developing. With changes the triggering angle for thyristor suitably, then can realize the TCSC equivalent reactance fast, continuously and adjusts smoothly, provides the controllable series compensation for the system, as to achieve increases the system transmitting capacity, enhance the transition condition stability, the damping power oscillation, and the purpose for improvement system tidal current distribution. Although in the entire time axis, obtains the analytic expression for TCSC running status variable is difficulty, but as long as had determined the analytic expression for various electrical quantity in a power frequency cycle, according to the stable state movement's symmetry and periodicity, we can determine the steady state profile that in the entire time axis, and then analyses the TCSC electric circuit’s steady-state characteristic with the time domain computation method. In this paper, topological analysis for TCSC operation established by formula, and then carries on the time domain partition to the TCSC electric circuit solution, finally obtains the steady state fundamental frequency impedance model for TCSC. This paper steady-state characteristic analysis is mainly carries on the topological analysis method to the TCSC main circuit, then establishes the stable state base frequency impedance model for TCSC, and analyses the resonance question for TCSC simultaneously. Then studies TCSC the steady- state characteristic, and with modeling and simulation on them to do further research and analysis, and utilizes the solution method for transformation territory, namely applies the Laplace transform solution equation of state. Thus can be obtained the zero-input response and zero status response formula for system.

Abstract: This paper utilizes the multiple fractal theories to define the box dimension and the multiple fractal dimensions, and realizes the feature of voice signal. Then it designs an extraction algorithm for voice signal feature. The result shows, the multifractal method is better than sole fractal method and it may be the characteristic parameter of the voice recognition.

Abstract: This paper studies the anatomical construction and physical-mechanical properties of Dalbergia sissoo Roxb introduced from Nepal planting in Yuan Jiang in Yunnan Province. Results indicated: Dalbergia sissoo is diffuse-porous wood and the form of its fiber is even with an average length of 1.43mm。The micro fibril angle is 12.24°.The air-dried and profile density are respectively 0.746 g/cm3 and 0.634 g/cm3, which are normal. The air-dried and oven-dried of variance shrinkage are 1.75 and 1.55 respectively. The comprehensive quality coefficient of Dalbergia sissoo is 2309×105 Pa, which is a high quality wood for higher level material. The comprehensive study shows that human breeding Dalbergia sissoo owns elevating quality.

Abstract: Based on CFD numeric simulation for hydraulic retarder under full-filled condition, the pressure distribution functions of the rotor blades surfaces are approached by coordinate transformation and surface fitting. Through the APDL program, loads which involved not only centrifugal force but also flow pressure are loaded on the FEA model according to the approximating pressure functions. The FEA model is solved and the blades strength is analyzed more accurately. Noted moment and speed, that is respectively 4000 N • m and 1343rpm, is determined under the promise of blade strength, and controlling strategy is made that constant braking torque shoud be carried out when speed is higher than noted value .