Applied Mechanics and Materials Vols. 401-403

Abstract: in this paper we present an information delay protocol using quantum the Bell state measurement. By sharing EPR(Einstain-Rosen-Podolsky) pairs and perform Control-NOT operation and the Bell state measurements, one person can give the other person some information which cannot be read until he or she lets the latter do. The unconditional security of the protocol is guaranteed by the laws of quantum physics. When the one decides to let the other get the information, he or she need only to send some dictates through a public classical channel. So the protocol is easier to carry out and more robust in practice.

Abstract: An assembly is described by a geometric model of its parts and their relative placement. Assembly tolerances are the result of parts of varying shape and size being put together to make the finished product. This paper considers the case where parts have tolerance geometry. Its main contribution is to use a tensor space to describe assembly features. The mathematical models are developed. The proposed approach is based on assembly feasibility analysis of shaft and hole features.

Abstract: In this paper, a new kind of Multi-model Predictive Controller (MMPC) is presented. Multiple models switch MMPC with Kalman filter based on neural network optimization was implemented in a DC/DC converter. Multiple models direct switch was used according to the two modes of the Boost-Buck circuit and different loads condition. Kalman filter was successfully added to the MMPC to transfer the optimal state value to MMPC from the output of the DC/DC circuit. Parameters optimization method is also discussed in the paper when the controller was applied to real model simulation. Simulation result demonstrates that the good performance of MMPC compared with single model predictive control and PID control. With the help of high speed FPGA, it is possible to apply this method to hardware simulation.

Abstract: The control principle of stepper motor which is widely used at present has been analyzed. It adopts 8051 single-chip microcomputer to achieve stepper motor the pulse distribution control, acceleration and deceleration control in the four phase eight beat mode. This study has avoided complex circuit design, solved the stepper motor "step", "overshoot" phenomenon, promoted step motor to be more stable, faster response, more accurate positioning. This control which has the versatility can be achieved by modifying the corresponding circuit and related procedures for different stepper motor. The control which is flexible and convenient, low cost, has the very high use value in the practical application.

Abstract: Precision location technology is one of basic technologies to realize the farmland working machine automatic driving and prescription agriculture; it is an important content of modern intelligent agricultural machinery research. In order to study a low-cost and high-precision location system which can be applied in the small machine worked in the south paddy field, the study proposed a double laser sources location technology. With the known distance between two laser emitter, the dynamic emission angle of laser emitter can be acquired and the location coordinate of the moving machine can be accumulated. Then the real-time coordinate information and moving attitude also can be obtained. It lays a foundation for unmanned working machine and data acquisition from fixed-point in the paddy field. First, the principle of laser location was introduced in the paper, and it focused on the design of mechanical structure and controlling unit. Then, the automatic tracking and location experiment was carried when the system was fixed on the rice transplanter. And the experiment shows, the distance shifting of tracking curve is less than 7cm in the measurement of 100m, and the advantage of the high precision, low cost and high portability is very suitable for the location requirement of south farmland working machine.

Abstract: To determine the action angle of is the important topics on Trajectory Correction technology.The pulse force action angle and residual impact point deviation were theoretically analyzed on the basis of traditional control strategy of pulse jets. It has been found that there may be a large residual impact point deviation when the correction ability is different. An optimization strategy for the pulse force action angle control was presented, and the method was verified by the 6-degrees of freedom trajectory simulation.

Abstract: A wireless sensor network (WSN) has important applications in many industries such as military, environment, healthy, home et al. This has been enables by the availability, of sensors that are smaller, cheaper, and intelligent particularly during the past few years. The design of a WSN depends significantly on the application, and it must consider factors such as the environments, the applications design objectives, cost, hardware, and system constrains. This paper constructs significantly the architecture of ocean fishing vessel WSN system, and briefly discusses existing problems of WSN technique and future research directions in application aspects.

Abstract: Aiming at the difficulty in control in tea fixation process, the intelligent control technology is adopted in the research which is for the core to the C8051F340 SCM and adopts the multi-point detection system to collect the temperature and humidity data. Besides, the data transmission with the epistemic machine can be realized by the I²C Bus, SPI and so on while the control rules and parameters of the controller can be intended. Thus it can be seen that the multi-parameter control of the temperature and humidity can be realized in tea green removing technology. The bunk watchdog circuit is adopted in hardware design to repair the systems bug automatically and safeguard the control system operate stably for a long time in this research. Additionally, the PID control algorithm is applied in software design to control systemic error less than 2%. Practical application indicates that this system is with simple structure, high reliability and good scalability, and it also can reduce the amount of labor and improve the teas quality.

Abstract: ntroduced the working principle and energy-saving analysis of cascade speed control system feedback chopping cascade speed control motor. The comparison of Inverter technology and chopping cascade speed control of the internal feedback technology.

Abstract: Using the traditional control method is difficult to obtain the ideal control result, because the linkage mechanism with clearance is a strongly nonlinear system, and it is difficult to establish the accurate mathematical model. In response to these problems, take the linkage mechanism with clearance for example and establish BP neural network offline modeling, on the basis of the experimental sample data. We separately applied the neural network internal model control and the parameters self-adjusting fuzzy control to reduce the nonlinear error caused by the clearance. The experimental results show that using intelligent control technology, the system stability has been significantly improved, and the system error has been reduced effectively.