Applied Mechanics and Materials Vols. 738-739

Abstract: China is a country with a shortage of water resources, how to use water reasonably and effectively has become a primary problem to most water conservancy workers. Automatically control water supply is an effective resolution. This method deal with the frequency signal on the water level sensor by means of single-chip, thus it can control on or off of the water pump. Water level can be set according to the volume of water pool. Because signal is transmitted via frequency, thus it may avoid the electric leakage and assure safety at the same time. Workers can directly observe the change of water level of water pool on the control interface.

Abstract: In this paper, based on the requirements of standards system of distribution automation, standardized testing method and testing process of performance index of distribution automation system (DAS) is proposed according to the characteristics of implementation, and the technology of automatic test is studied. The paper also brings forward a set of feasible evaluation method and system of DAS to ensure the safe and stable running of distribution automation (DA), combining with a common information model (CIM) import and export function test based on feedback principle and a function test of feeder automation based on predefined fault model.

Abstract: In traditional control field, the control system dynamic model is accurate or not affecting the merits of the main control key, the more detailed dynamic information system, the more it can achieve precise control. However, for complex systems, because too many variables are often difficult to accurately describe the dynamic system, so engineers will use a variety of methods to simplify the system dynamics, in order to achieve the purpose of control, but not ideal. Fuzzy control is essentially a nonlinear control, intelligent control of subordinate category. The design, select AT89S51 microcontroller as controller design an intelligent heat faster. The intelligent heater temperature can be maintained within a set temperature range, so that the water temperature to fluctuate within a range set value and set value down to 0.5 degrees Celsius. Temperature sensor detects a temperature every second. Temperature can be displayed to one decimal place. Temperature detected by real-time digital display. Fuzzy Control of a major feature of both systematic theory, there are a lot of practical application background. Development of fuzzy control has been rapid and widespread application. Nearly 20 years, both in theory and fuzzy control technology has made ​​great strides to become a very active field of automatic control but fruitful branch. Typical applications involve many aspects of their production and life, for example, fuzzy washing machines, air conditioners and other aspects.

Abstract: Based on the principle of crawler drive, this paper puts forward a crawler robot climbing stairs device that can have a ground walking, climb stairs and travel across the barriers, which is convenient for the elderly and the disabled to travel.While using built-in the rotation of the swing arm to achieve the effect of climbing stairs, the complex wheel climb building device and crawler drive technologies can effectively avoid the dangers of climbing stairs.The key technology in this paper combined the triangular frame and the center of gravity retaining device in order to require the stability of the stair climbing devices.In conclusion, the present invention is good at climbing stairs more than traveling, which has the higher comprehensive benefit.[1]

Abstract: to study the nonlinear oscillation principle of new robofish’s two joints tail, the relationship between tilt angle of tail fin that produces thrust and cycle offer quency produced by two joints fin tail propulsion system can be calculated applying reciprocating motion principle in theory; by means of contrastive analysising the results of calculation model, and making use of MATLAB simulation environment to experimental simulate motion model, the fin tail NLSST can be further proved.

Abstract: For the difficulties of PID controller parameter optimization, we have put forward a novel depiction method PPOGS (PID Parameters Optimization based on Glowworm Swarm). By combining the minimum error absolute time integral definition proportion, the objective optimal functions of integral and differential functions, this method can produce the optimal allocation with the help of the glowworm swarm algorithm which seeks solution to the objective function. At last, we use MATLAB to make a simulation experiment, conducting an in-depth investigation of the key factors influencing the method. The results have showed PPOGS has better adaptability compared with other methods Key words: PID controller; parameter optimization; glowworm swarm; simulation

Abstract: As the incomparable advantages, permanent magnetic synchronous motor (PMSM) has been used widely in servo system, numerical control machine. The paper introduces an EKF (extended Kalman filter)-based sensorless vector control system of permanent magnet synchronous motor. The rotorfield-oriented control strategy based on id=0 is selected. After expounding the principle of EKF and recursion algorithm, it derives the Kalman state equation in PMSM rest coordinate, makes a discretization processing, and constructs vector control system based on EKF estimator. The simulation model of vector control system of PMSM with MATLAB/Simulink is built and on this basis, it observes the position and speed of the motor rotor by the use of the EKF estimator. Simulation results demonstrate the EKF estimator can accurate estimates of the PMSM rotor position and speed.

Abstract: This paper introduces the work process and mechanism of the head-box, from the experimental point of view, analyzed the relationship between the head-box control parameters. The relationship between the level and the total pressure and the relationship between the fan pressure and total pressure is give. Through various experimental results, the control algorithm and strategy of the head-box is proposed. The practice shows that the total pressure control precision is about 3%.

Abstract: Gas hot water boiler is widely used in daily production and life as heat supply equipment. According to the gas hot water boiler has the characteristics of nonlinear, large inertia and multi disturbance etc.，this paper adopts the Vague Set PID control mode as the regulating mode in system. Considering the reliability of the running control regulation system of gas boiler, the stability of the fuel delivery system and the fault alarm security system, this paper designs the combustion controller based on a STM32 MCU as control chip, the μCOSII real-time operating system transplanted in nuclear of MCU as the overall control of the combustion controller. Blocking the whole task through the μCOSII real-time operating system, to enhance the reliability of system program operation, and made the combustion controller running more safe, stable, reliable.

Abstract: Three-phase stepper motor is a device that can convert the electrical pulse signal to a linear displacement or angular displacement to achieve a given angle of rotation. Its application becomes increasingly widespread in the field of power and control. This paper intruduces three-phase stepper motor control application based on TI 2000 Series’ DSP TMS320F2812, and describes the specific hardware and software of the system.