Advanced Materials Research Vol. 529

Abstract: According to the traditional distribution network reconfiguration, the fault feeder with distributed generation (DG) will separate from the distribution network immediately while the network goes wrong. In order to improve the system power supply reliability and the utilization rate of DG, the new standard allows the distribution network change into island operation. This paper establishes the mathematics model of the distribution network reconfiguration with DG, the objective function and constraint conditions. The traditional genetic algorithm (GA) has the shortcomings of premature convergence and slow convergence speed to solve this nonlinear optimization problem. This paper applies the cloud genetic algorithm (CGA) to solve the network reconfiguration problem. The Case study on IEEE33 test system shows that the algorithm is reasonable and effective.

Abstract: By analyzing geological background and landscape feature, and comparing with other geophysical methods, Dual Frequency Induced Polarization (DFIP) method is considered to be the most suitable for the copper deposit rapid exploration in the special landscape area of southern Peru. The conclusion has been proved by two examples of DFIP method survey, one is Cercana-Don Jovier exploration area in the Andes, and another is Rosemary exploration area in the coastal desert area. For giving full play the technical superiority and equipment advantages of DFIP method, some field survey techniques methods which include working frequency, array type, power supply system, measurement system and ways of overcoming interference, are discussed to take fully technical superiority and equipment advantages.

Abstract: Cutting force measurement system by force measurement instrument, general data collection system and PC of three parts. The size of the cutting force general use have experimental results set up experience formula. Introduces two kinds of accurate measurement method of cutting force. Choose DEWESoft data collection and analysis system software as research means of cutting force. Through technical analysis and cutting force measurement technology development direction was predicted.

Abstract: A two-dimensional finite element model of PMLSM is build based on the finite element analysis software Magnet to research the diagnosis of stator winding inter-turn short circuit fault in PMLSM. The velocity, thrust, the stator current performance curve are obtained by simulation using Magnet when PMLSM is normal and under different extent inter-turn short circuit fault, the harmonic content of speed and thrust are analyzed using Matlab / Simulink , the conclusion that the thrust of the harmonic content is used as the Permanent Magnet Linear Synchronous Motor (PMLSM) stator inter-turn short circuit fault feature is proposed , which provided a basis for detection of stator winding inter-turn short circuit fault in PMLSM.

Abstract: Along with the rapid development of computer, IC and signal disposal technology,fire alarm system has been more integrated,intelligent and multi-functional. The method of fire detection has also changed from single signal to multiple signal. Temperature sensorPhotoelectric smog sensor and CO sensor are integrated to a compound detector for fireproof. All kinds of signal will be judged by single-chip microcomputer. NN intelligent arithmetic is applied to software design. The Multi-signal synchronization detection is simulated by MATLAB.

Abstract: To describe the Underground low-pressure explosion-proof switch which has to require rapid processing of multiple frequency signal, the paper analyzes the specific signal and the common algorithms, according to the characteristics of the explosion-proof switch protection device to provide the high-precision, low-cost and high-speed data acquisition methods based on the single chip controller, which is also applied the BZD low burst intelligent protection.

Abstract: Different encoding scheme and method for process description of state machine are analyzed in detail, and the advantages and disadvantages of each are pointed out. The general state machine design method is given by a specific example program, according to the actual need, designers can choose different encoding scheme and method for process description to design.

Abstract: A control structure of PID control based on repetitive compensation for the X axial transmission system of the double-side blade grinding machine is proposed in this paper. The repetitive control structure is applied into the common PID control method. Then the simulation for the position control of the transmission system is carried out to verify the effectiveness and feasibility of the proposed control algorithm by Simulink. The results show that the control algorithm proposed in this paper has a good prospect in precision machine tools.

Abstract: Design and implementation of Automatic Schematics Verification Platform based on open EDA (Electronic Design Automation) tools has been discussed. This platform adopts client/server pattern and provides an environment of design Verification and sharing data for designers separately, and at the same time, this platform has strong transplantable ability because of it’s strong cohesion and weak coupling with the open EDA tool, therefore we can transplant this platform to other open EDA tools expediently.

Abstract: As the rapid development of China’s national economy, China’s construction industry shows a rapid growth. Because construct project has the feature of large investment and long construction time, there are many unforeseen factors in the construction process. The project participants may face many risks. This paper firstly analyses risk factors of construction project, secondly describes the mathematical models—SVM, and then on the basis of the method builds the model of construction project risk prediction. Lastly it uses example to prove the feasibility of the model, and it also provides an effective method for the construction project risk management.