Abstract: As parallel operation of several single inverter modules, the alternating voltage outputted by the single inverter module should guarantee same frequency, same phase and equiamplitude. Otherwise, circumfluence will be caused in the single inverter module. The circumfluence not ecreases output capacity of the system but destroy the inverter in serious condition. So, restraint circulation is the key technology of inverter modules in parallel control. Based on the analysis of inverter modules in parallel control, this paper designs the parallel current sharing system of multi-inverter modules with TMS320LF2407A as the main hip, adopts the control strategy of “direct current sharing”, and achieves the data communication in multi-modules allel connection as well as the effects of multi-inverter odules in parallel current sharing control with CAN controller embedded in TMS320LF2407A.
Abstract: The temperature control is one of the most common control system,with the development of the sensing technology, new single-bus digital temperature sensor to achieve faster development of the test and control of the temperature. The system is a temperature sensor AD590 to acquisition analog signals, after ADC0809 converted into digital signals to 89C51 single chip processing, so as to achieve the collection of temperature, and then through the CD4511 drive seven sections LED display. The system can control of temperature, through the keyboard for temperature of add or subtract Settings, if detection temperature is more than set temperature, stop heating, if detection temperature is below the set temperature, start heating. The system of design and wiring are simple,easy extension, cost-effective, volume is small, compact structure,strong anti-interference ability.
Abstract: Intelligent management of bullets at shooting ranges suffers from the limitations of manual bullet counting. Based on UV electro-optical technology, we have built a bullet counter and participated in field experiments. The bullet counter is composed of two modules, UV electro-optical module and data processing and communication module. In UV electro-optical module, a ‘solar blind’ UV detector is used to detect UV radiation of bullet flames. The embedded preamplifier of UV detector and the low-pass filter increase the signal-to-noise ratio of the system greatly. In data processing and communication module, analog signal, containing bullet impulses, is converted to digital signal and counted by a timer. The results of bullet counting can be read by USB. All these functions are implemented by STM32 (STM32F103CBT6), a microcontroller based on Cortex-M3. The bullet counter has been put into use at several shooting ranges and worked well.
Abstract: The control of the water hydraulic vane actuator has direct influences on the performance of the water hydraulic system. In the paper, a variable structure control (VSC) has been proposed and applied to the position tracking control of a water hydraulic rotary actuator. Based on the model of the water hydraulic vane actuator, simulation experiments and comparisons have been done with VSC controller and PID controller, respectively. Simulation experiment results show that in position tracking control applications, the use of VSC as the controller of the system is able to improve the position tracking performance of the system. Especially, the VSC system provides stronger robustness to different reference inputs than the PID control system. The position tracking control properties of the water hydraulic rotary actuator validate the effectiveness of the proposed VSC.
Abstract: Relay logic control circuit also known as chain control mode as a kind of traditional electric drive control mode, with its low cost, easy to implement, easy to master, strong anti-interference ability, the requirement of environment temperature is not high, easy to repair and other features, that holds a very important position in the industry control domain. This paper gives the new method of using Kano map to designing a relay logic circuit. Firstly, according to the demands of the object, draws the control truth table, writes the logic expression function, carries on the simplification using the Kano map to the logical function, deals with “competition” and “risk”, then the circuit could be got. A practical example is added to explain the designing method and procedure. Hence, give a systematic designing theory of relay logic circuit.
Abstract: For optimal design of mobile robot path planning problem, an improved artificial potential field control method is designed. Using infrared sensors and ultrasonic sensors to detect the surrounding environment will get the information of obstacles and goals. Proposed an adaptive real-time localization algorithm based on improved DV-Hop algorithm to realize real-time localization for wireless sensor network mobile robot. The improved artificial potential field adopted the improved potential function that ensured the goal is the global minimum so the mobile robot can reach the goal freely. The effectiveness and feasibility of the improved algorithm verified by simulation.
Abstract: In this paper, a new application of three-phase inverter using zero-vector control is proposed. In order to control the amplitude of output current, the d-q axis coordinate transformation, hysteresis controller and space vector strategy are adopted. Besides, the frequency of output current also can be adjusted by zero-vector control. Therefore, the proposed inverter has lower switching loss, higher system efficiency and better dynamic response. Use VisSim simulation software and TI TMS320F28335 chip to implement the proposed control strategy. The controller has several advantages such as easier to control, smaller circuit size and fully digital design etc. Finally, the experimental results are compared with the proposed theory for verifications.
Abstract: Aiming at resolving the large difficulty of gap adjustment in APMP (Alkaline Peroxide Mechanical Pulp) refiner, and it is difficult to reach the production requirement by using traditional PID controller, an improved PID controller (human-simulation intelligent PID controller) is proposed through combining the conventional PID controller and human-simulation controller. And it has been used in APMP refiner control, and the simulation results and practical application results show that this method is feasible and accurate.
Abstract: The new highly integrated mechanical and electrical integration linear output sensor system designed is used to solve the problems of movement conversion/transmission, force transmission/ measurement etc. Firstly, further theory study is presented and the function of sensing parameters and transmission parameters is deduced; Secondly, the key parameters of system design and the constrained conditions are shown based on the system structure and strength theory. At last through simulation to determine the optimal structure parameters meeting the specific conditions and establish the corresponding relationship of parameters for future design.
Abstract: The reliability, availability and maintainability (RAM) analysis of a computerized numerical control (CNC) system is helpful for performing design modifications that are required to achieve minimum failures or to increase the mean time between failures (MTBF), to plan maintainability requirements, to optimize reliability and to maximize equipment availability. To demonstrate these benefits, this paper presents the application of RAM analysis in a CNC system. The Weibull approach is used to model the CNC system behavior. After determining the steady state solution for the CNC system behavior, the corresponding values of reliability and maintainability are estimated at different mission times. The computed results proved to be helpful for analyzing the CNC system behavior, which enabled a considerable improvement of the system performance by implementing suitable maintenance strategies.