Advanced Materials Research Vols. 1044-1045

Abstract: This paper describes a boiler temperature cascade control system using PLC as the controller. Here, PLC is used to control the voltage across the resistance wire inside the heater (Control Parameter). This is done in order to regulate the water temperature at the outlet (Primary Parameter to Control) and the water temperature inside the hearth (Secondary Parameter to Control) of the boilers (Object to Control). Using a PID algorithm, the system is able to automatically control the boiler temperature by programming the language - PLC LAD Ladder Logic Diagram.

Abstract: New blackboard dust collection system mainly be used for conventional teawching actions. It divided board into four different regions without changing basic structure, when people go into the view of sensor in the one of regions which will drive the quit fans to collect the dust produced during writing and clearing words on the board. The device includes two parts, mechanical structure and the region control system. For structure, be made up with up and down parts, the dusting devices and fans are chose by the stress analysis of the dust model, and then begin design work. For control system, using photo-electric switch to drive fans, and the angle of wind board is controlled by DC motor, and chip microcomputer STC89C52 is chose as the system core to achieve logical functions. The system can effectively reduce the harm from dust to the human and equipments during teaching. It has great characteristics including high efficiency and energy saving, low cost, simple structure, easy operation, high reliability and practicality.

Abstract: this Paper Aim at the nonlinear object of industrial boiler with instability Parameter and difficult building math model, combining fuzzy control theory, an adaptive controller built with fuzzy neural to control industrial boiler is proposed. On based of analyzing coal-fired boiler inflammation system technological process and work process, the coal boiler inflammation system control scheme is designed. Then, this paper introduced the fundamental theory base and design means of fuzzy controller, and gives fundamental design process of it. At last, after the fundamental use tool kit below the Visual Basic is introduced, using it has a simulation study on the coal boiler inflammation system and gives conclusion.

Abstract: The main controller STM32F103VET6 was used as the core of the system. The change of angle and angular velocity was detected by accelerometer and gyroscope built-in six axis attitude sensor MPU6050. The double closed-loop control was used to regulate the speed of DC motor JGA25-371, so as to adjust the posture of the robot. Test shows that the whole system design is simple, good stability and anti-jamming.

Abstract: This study was aimed to design and develop the strip belt shelling and cleaning units for sunflower seeds. The different principles of operation by streak belt consist of number of strips and its configurations: full swath section, 4 – 5 zigzag and 4 eccentric drums. Five different linear velocities of drum 9.75, 10.00, 10.25, 10.50 and 10.75 m/s were evaluated. Pacific sunflower with 9.62% w.b. moisture content was prepared to test the performance of shelling unit. In the cleaning unit, the testing was done at various 1.82 – 3.08 m/s air suction speeds and 30 – 40 degrees plate inclination angles. The shelling result showed the appropriated condition was 4 eccentric drum with the 10.50 m/s linear velocity. The shelling was achieved 80.43% efficiency and 84.36% commercial seeds (whole and small damage kernels) at 15.17 kg/h capacity. The proper condition for cleaning was 2.45 m/s air suction speed and 30 degrees plate inclination angle. Cleaning achievements were 98.64% efficiency and 0.07% kernel loss in suction air.

Abstract: It describes the development and the present situation of the open CNC system technology. Taking the FANUC30i and Siemens 840D CNC system as an example ,it does an explicit research on data acquisition of the CNC system based on the Ethernet. It proposes a solution with high practicability and low cost for the users who want an online monitoring and alarming system of the CNC system.

Abstract: The dithered ring laser gyro (DRLG) strapdown inertial navigation system (SINS) is widely used in many applications, including military and commercial systems for the advantages such as high accuracy, wide dynamic range and bandwidth, outstanding scale factor stability over temperature, compactness and lower cost. However, the dither motion introduced to eliminate the lock-in error which is the inherent phenomena in the ring laser gyro also brought the adverse disturbance to the inertial measurement unit (IMU). Meanwhile, the installation environment of the SINS may also bring undesirable vibration and shock. For these reasons, a feasible and reliable suspension system is required to provide decoupling of the translational and rotational vibrations of the inertial sensor assembly (ISA) and attenuating the outside vibration and shock. Based on this, the isotropic design method of suspension system of DRLG strapdown IMU is proposed in this paper. The method consists four principles: 1) the input axes of sensors should be placed symmetrically along the ISA symmetric axes which are also the principle inertial axes; 2) the mass center of ISA is also the center of the geometric structure; 3) the elastic center of the suspension system is overlapped on the mass center by placing mounting isolators in the ISA structure corner in the isotropic manner and 4) the first mode frequency of ISA structure should be twice or more higher than the maxim mechanical dither frequency of DRLG triad. Following these principles, a design practice is implemented. The simulation and the experiment result show that the IMU using isotropic design method is proved to be feasible and reliable even in the extreme temperature ambiance.

Abstract: With the development of science and technology, the theoretical content of mechanical fault diagnosis technology has been initially improved and established a scientific research system. Combining the mechanical diagnostic techniques with the current advanced science and technology, a variety of mechanical fault diagnosis methods have been researched and developed. Mechanical fault diagnosis evolved from empirical diagnosis to mechanical diagnosis and then to the current intelligent learning diagnosis. Now mechanical fault diagnosis collects mechanical failure data precisely mainly by a variety of sensors, uses a variety of fault diagnosis model to conduct diversified and intelligent diagnosis.

Abstract: The paper focuses mainly on the maximum control method of boost chopper circuit based PMSG wind turbine. It includes a full bridge rectifier, boost chopper circuit, and a two-level voltage converter. Therefore, this PMSG system can directly connect with the gird; and the active power and reactive power can directly control by the grid voltage oriented vector control. The maximum power control method of the boost chopper based PMSG was studied to charge a constant resistance. In this study, the maximum power control is improved to apply in gird connection system.

Abstract: A blind source separation technique is widely used in voice, video, communications, medical, mechanical failure signal processing, and data mining, and many other fields. Such a broad application prospects, making the blind signal separation problems on continuously were widespread concern experts and scholars at home and abroad. This paper describes the meaning of blind source separation techniques, a detailed description of the application of this technique to detect defects in terms of mechanical parts, due to the blind source separation algorithm is a regular in the development of the theory, and how to better integrate its application in the field of diagnosis defective parts, will be an important issue in the future is worth further exploration.