Applied Mechanics and Materials Vol. 415

Abstract: The fault test equipment of mine launcher system is developed. This equipment is divided into two functional parts: master controller, an industrial processing computer and corresponding application software, which mainly engages in human-machine interactions, controlling the testing process, diagnosing the fault as well as display the output, and slave controller that performs data acquisition, signal conditioning, connection and transformation. Its hardware is composed of main control circuit with two complex programmable logic device (CPLD) chips, signal conditioning circuit, serial interface module and dedicated interface adapter unit. In addition, the application software of master controller is modular and object-oriented and developed by LabWIEW. The slave controller software is developed in VHDL that performs sampling and configuration of firing control and configuration signals. And the software consists of the five key modules: baud rate generator, enable module, pulse signal count module, data acquisition module of high level signals and communication module. Thus the equipment actually provides effective technical method in improving the repair and support skills for the mine launcher control system.

Abstract: This paper deals with the testing, isolating and diagnosis of construction machinery. Subsequently, the analysis of operating status, faulty mode and running parameter is carried out. The equipment implements the detection, processing, storage and alarming of the operating status parameters, such as temperature of cooling system, oil temperature, oil pressure, engine rotation speed, oil temperature of torque converter as well as oil level of sump and etc. Meanwhile, the real time fault alarm and historical data analysis results can also be performed and illustrated by vivid graphical interface. The embedded ARM microcontroller, which is the core module of the system, manipulates the data acquisition of operating parameters for the construction machinery. Application software of ARM chip processes the operating status parameters and accomplishes alarm and control operations under failure pattern of the machine. The failure data can not only be displayed and alarmed synchronously, but also can be stored for further fault analysis. The equipment can record various types of operating parameters, and is applicable to many different types of engineering vehicles.

Abstract: It is very important to detect the accurate rotor position of switched reluctance motor (SRM) for a high-performance switched reluctance motor drive. And, there are two main factors to influence SRMs rotor position detection, which are the accuracy of the position signal and the controllers real-time response. It cant meet the accuracy requirements to detect shaft position information by opto-couplers, so absolute encoder is used to produce the high-precision rotor position signal. Moreover, the all-digital controller based on DSP and CPLD achieves the real-time detection and applications of high-precision rotor position signal on SRM, with their strong ability on data processing and hardware logic describing. Due to adopting high-precision rotor position detection and control, it carries out successfully and improves the system performance. The experimental results show that the design is reliable and effective, which has great significance for the establishment and realization of high-performance SRM drive.

Abstract: The rotor position of switched reluctance motor (SRM) is an essential information, and especially in high-performance SRM drive, it is important to achieve high resolution and real-time position detection. However, opto-coupler and linear encoder cant meet the demand of position detection accuracy. Moreover, if the controller detects the position directly, it is difficult to achieve a controller for remote control of the position detecting because of interference. In this paper, a novel position detecting method is proposed. Absolute encoder is used to achieve high resolution rotor position signal. MCU collects position signal from encoder, and The position information is transmitted to the master controller DSP via the Controller Area Network (CAN) bus. The experimental results show that the position detecting method meet the requirement of high-precision and real-time function of high-performance SRM drive.

Abstract: Abstract: The direct-drive PMSG wind power has been widely used in small and medium-sized wind power. The master control system is core of the control system. In the Small wind power systems, the control system requires both stable and reliable operation, but also to minimize power consumption and cost. With the study on the existing technology of wind power main control system and on the basis of the existing science and technology accumulation, this paper proposed research program based on ARM and Linux embedded wind generation master system.The master control system developed in this paper has the following advatages:more automated,more accurate, simple and direct, low cost, low power consumption, easy to maintain, make the work more stability.

Abstract: In this paper, the principles of wavelet transform and wavelet packet transform were presented. The wavelet packet transform had good characteristics of uniform frequency decomposition, and thus transient harmonic analysis method was proposed based on wavelet packet transform. Finally, transient interharmonic, time varying harmonic and transient oscillation signals in power systems were simulated with Matlab emulator. The perfect results of simulation show that the presented method can accurately detect the transient harmonics, which provides support for harmonic analysis in power systems.

Abstract: This paper presents and analyses characteristics of the excitation control of DFIG connected to the grid basing on the rotor similar signal method. It also identifies the control object and then proposes the controllers of the active power and the reactive power of DFIG fed into grid. There are two PID controllers used to independently control the active power and the reactive power. The parameters of the PID can be changed and adjusted by the fuzzy tuner to improve the quality of system. Basing on this control system, the quality of the system is good; such as time transition and time response of this system are very small in comparison with those of the system of previous researches.

Abstract: The design of DC servo control system for focus motor is an important part to realize the electronic theodolites auto-focusing. Focus motor is seriously influenced by various disturbances, such as friction and torque fluctuation, in frequently reversing process. It is difficult to accurately locate. To solve these problems, a DC motor control method was put forward which combined the integral separation PID and disturbance observer. Based on the three closed-loop DC servo system, the integral separation PID controller was taken in position loop, in order to eliminate static error and improve the control precision. The methods of motor trajectory planning were analyzed, the 4-5-6-7 interpolation trajectory planning was used to decline or prevent the start-stop impact and oscillation. The effectiveness of the control strategy was verified by comparative simulation experiment. The robustness anti-disturbance and location precision performance is improved significantly.

Abstract: In this paper, the admissible conditions (regular, impulse-free and stable) for a class of continuous-time Takagi-Sugeno (T-S) fuzzy descriptor systems are investigated. Sufficient admissible conditions for the closed-loop systems under non-parallel distributed compensation (non-PDC) feedback are proposed. This approach is mainly based on the state space division properly to make the membership functions continuous differentiable. Moreover, in order to make good use of the systems’ structural information in rules, the provided conditions are obtained through fuzzy Lyapunov functions candidate and can be formulated in terms of dilated Linear Matrix Inequalities (LMIs). Finally, the effectiveness of the proposed approach is shown through numerical example by using the optimization toolbox.

Abstract: A robust adaptive fuzzy control scheme combined with an adaptive fuzzy control algorithm and H_∞ control model is proposed for the trajectory tracking control of robot manipulator with structured and unstructured uncertainties. The adaptive fuzzy control algorithm is employed to approximate structured uncertainties, and the nonlinear robust H control model is designed to eliminate the effect of the unstructured uncertainties and approximation errors. The validity of the robust adaptive fuzzy control scheme is demonstrated by numerical simulations of a two-link rotary robot manipulator.