Applied Mechanics and Materials Vols. 530-531

Abstract: Computer technology has become the world's most popular information technology, computer programming software technology continues to progress, leading people to the level of economic life. The human brain is the most advanced machines, all computer programming is to emulate human computer, the computer program to imitate the human brain as the main purpose to achieve our automation development. For electrical automation of the whole control process, it is through automation equipment to complete the entire process of production, distribution, etc. Thus to a large extent, reducing the cost and working efficiency are also increased accordingly. With the development of information technology, it constantly have new technology into engineering, and the transition phase, the automatic control technology put forward new challenges, promoting the theory of intelligence in the application of control technology, in order to solve the problem with traditional methods.

Abstract: In response to characters of multi-robot systems in RoboCup soccer game and dependence between decisions of robots, multi-robot systems task allocation was analyzed by means of game theory in this paper. Formalized description based on game theory for multi-robot system task allocation was offered, and a game theory based task allocation algorithm for multi-robot systems (GT-MRTA) was proposed. Experiments show that GT-MRTA has low complexity, and less time-consumption, can obtain comparative schemes with centralized method, and shows good robustness to communication failure and robot failure.

Abstract: As an important part of the underwater robots, bionic robot fish is one of the international forefront in the related research fields. This thesis first designs specific ways of robot fish path planning based on genetic algorithm, then builds the environment model and selects the appropriate fitness function. Finally, it uses the MATLAB to simulate the robotic fish barrier shield path, then analyses and summarizes the experimental results.

Abstract: To the problems of real-time obstacle avoidance path planning for apple harvesting robot manipulator in dynamic and unstructured environment, a method based on improved ant colony algorithm is presented. Firstly, Vector description is utilized to describe the area where obstacles such as branches is located as irregular polygon in free space, and MAKLINK graph is used to build up the environment space model. Then, the improved Dijkstra algorithm is used to find the initial walk path for apple harvesting robot manipulator. Finally, the improved ant colony algorithm is applied to optimize the initial path. The experiment result shows that the proposed method is simple and the robot manipulator can avoid the branches to pick the apple successfully in a relatively short time.

Abstract: This paper considers the problem of stabilizing linear time-invariant plants by a PID controller. If the proportional gain reaches the extreme value, the closed-loop system contains a double pole on the imaginary axis. Using this property, the admissible range of the proportional gain is derived, also the corresponding integral gain and derivative gain are obtained. If the proportional gain is fixed, the stability region in the plane with respect to the integral gain and the derivative gain is determined by plotting the stability boundary locus. The effectiveness of the method presented is illustrated by several examples.

Abstract: This paper develops the design technology of a sensing platform for the HWR to perform a role of both health and life care in an aging society. The localization of indoor mobile robot is so important for its elaborate trajectory control. We set research focus on self-localization in this paper. The RF sensor network system is installed to improve its self-localization ability so that the HWR can identify its own location and track the path very well. A fusion algorithm using RSSI(Received Signal strength indication) and trilateration is also proposed for the agile self-localization. It is implemented by new configuration of novel sensing architecture and embedded software. Finally, we confirm its good performance through the resultant data of live tests.

Abstract: Converter gas has plenty of heat energy and its recycle is very meaningful. The paper introduces the classical gas recycle outline. The system mainly consists of the converter and electrical control unit. The electrical control unit employs different devices to get rid of the moisture or dust and PLC and analyzers to accomplish gas recycle.

Abstract: C8051F020 MCU with rich external resources on-chip, in the electromagnetic stress test excitation signal or a power conversion circuit design, it can provide comprehensive control PWM signal and signal system, simplify the circuit hardware. This paper uses the voltage feedback signal through the C8051F020 single chip ADC0 conversion, and converts the result to send PCA0 module implements the 16-bit PWM signal output. At the same time generating a PWM signal, use ADC0 Window Detector achieved over the range of the input value alarm and protection, also, because the ADC0 is 12-bit, so, in the program for PCA0 values were trimmed, PWM signal output frequency can be set have been achieved and verified by experiment design conclusions.

Abstract: LED driver plays an important role in unleashing many advantages of LED, such as high efficiency, long life-time. A constant current fly-back LED driver based on TOP222 is designed in this paper, and the transformer of the constant current power supply and the constant current feedback circuit are deeply researched. The experiment shows that, the output current of the LED driver is 1A, the output power is 10W, the power supply works in constant voltage mode within the low load situation. The result shows that the driver featured with good stability, constant-current characteristic, and high efficiency, is capable for driving LED.

Abstract: In this paper, a signal flow graph structure of current-mode multifunction filter using current differencing transconductance amplifier (CDTA) is presented. The proposed configuration is comprised of two grounded capacitors and four CDTAs. They exhibit low-input and high-output impedances, which is very convenient for integrated circuit implementation. The presented filter configuration can realize all the standard filter functions simultaneously, lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without any component matching conditions. The natural frequency () and the bandwidth () of the proposed filter can be electronically tuned by varying the bias current of the CDTA. PSPICE simulation results are included to confirm the theory.