Abstract: Seeker plays an extremely important role in precision-guided weapons, among which the high tracking precision ability of servo system is one of the key technology. This paper studies the three-loop control system applied in the rate gyro stabilized platform of an infrared seeker and researches the stability, rapidity and accuracy of speed loop ,current loop and position loop. Finally, according to the engineering project, we can verify the validity and applicability of this triple loop system.
Abstract: The authors have developed a shark ray robotic fish based on biomimetic approaches. The paper describes the newly developed robotic fish technology and its application to mechatronics in the space. It is found that robotic fish technology creates not only new underwater robotics, but also the next generation space mechatronics for geological survey of lunar/planets and dust cleaning in the space station.
Abstract: In this work a fuzzy model-based predictive control (FMPC) method that uses modified particle swarm optimization (PSO) is presented. The main objective of this work is the application of this method to the control of a Selective Compliant Assembly Robot Arm (SCARA) with four degrees of freedom (4-DOF).
Abstract: The ups and downs control is one of the important control functions of the floating dock.Using modern control technology, automatic control of the floating dock can not only reduce operation intensity, can also improve the execution efficiency, shorten the operation time, improve the safety of ships.Based on a certain type of floating dock,the article explains how the ups and downs of floating dock works and introduce the research and development process of automatic control of floating dock.
Abstract: In the distributed control system, to make sure the running of the system bus is long-term, stable and reliable, we design a new intelligent redundant serial bus as the system bus, and it will be introduced in this article. The new intelligent redundant serial bus (IRSBUS) is able to be configured into a dual redundant synchronous bus or a quadruple redundant asynchronous bus, and its redundancy is hot redundant that means two groups of the four signals are working together. We mainly design a redundant IP core, a redundant protocol and the byte format. The IP core of IRSBUS consists of the following major modules: Intelligent Signal Router, Signal Transceiver, Lines-connecting Status Detector, Synchronous Controller (Master), Synchronous Transponder (Slave), Redundant Results Decider, Interrupt Generator, Dual-port RAMs, Control and Status Registers, Master / Slave Redundant Logical Controller. The redundant protocol and byte format provide an extremely strict timing to synchronize the master-slaves and transmit the information. We show that our design allow to compare the redundant data to arrive at the correct results. It also provides a way to regroup the remaining signal lines into a system bus when one or two of the four signal lines are broken. And then it detects the lines-connection status every 100 milliseconds.
Abstract: This paper introduces the craft process and work principle of the quartz crystal tin dipping machine, and pays attention to elaborate the design content of pneumatic system and control system. The equipments control cores are Siemens small size PLC and industrial touch screen, and selects air cylinder and micro motor as the main executive components, which can guarantee the facilities reliability and flexibility, have strong anti-interference capability. Through long-term spot application, it indicates this tin dipping machine has stable operation, low failure rate and flexible and convenient operation.
Abstract: Brushless DC motor (BLDCM) is adopted in the driving of a three-axis turntable. A high-speed current sampling system plays a vital role in intelligent control. This article firstly describes the working principle of a triple-closed-loop regulation system and emphatically dissects the characteristic of the current-loop among speed-loop and position-loop. Secondly, a signal acquisition-alignment circuit of three phases’ current and voltage is designed. Based on ADS8365, a scheme of high-speed current loop’s precise and synchronous sampling system is provided. Finally, experimental results have proved the validity and practicality of the scheme applied in the control of three-axis turntable.
Abstract: For high-power current source inverter work object is a nonlinear time-varying systems, which could easily lead to the inverter voltage and current output waveform distortion, this paper firstly proposes a new variable-rate reaching sliding mode control scheme to solve the above problems existing in current source inverter system. In this scheme, we construct the variable structure model of the system, determine the sliding surface, give the variable-rate reaching control law and deduce the sliding domain. At last, the simulation result proves the validity and superiority of the scheme.
Abstract: In a laser marking system, a laser marking controller should be designed to control several galvanometers through a certain interface using a certain protocol, such as the XY2-100 or SPI. The selection of the protocol depends on the configuration of the laser marking system. Using different protocols makes the controller design provide two types of interfaces. If different protocols have their own physical interfaces, the circuit becomes more complicated. In order to decrease the number of physical interfaces and ensure the protocol compatibility at the same time, two protocol signal generator modules based on FPGA are provided and the output signals of the two modules share the same physical interface, and only one of them can be chosen according to a flag set by users. This design makes the circuit simpler and decreases the design cost.
Abstract: The main electrical connection of substation, consisting of transformers, bus bars, circuit breakers, isolating switches and other equipment connected with each other through cables, has an obvious characteristic in dots and lines, so graph theory is reasonable as the analysis method. Based on graph theory, the main electrical connection of substation is converted to the network model with nodes and branches. Connectivity between nodes on behalf of source points and load points is regarded as the reliability criterion, with the overload ability of transformer considered simultaneously. Non-sequential Monte Carlo is used to simulate the condition of equipment in the main electrical connection, along with the states of the system. The reliability of single-bus connection and sectionalized single-bus connection is calculated under given reliability criterion, and the results indicate the feasibility of graph theory method and correctness of the modified reliability criterion.