Applied Mechanics and Materials Vols. 496-500

Abstract: Computer-guided optical alignment technology requires adjustable lens, while such lens are rear for some optical systems due to structural limits. This essay focuses on using the compensation relations between misalignments to improve alignment accuracy. Firstly the influences from misalignments to wavefront error were researched and two-order compensation model of misalignments were built. Secondly, the essay developed an algorithm based on multi-fields merit function regression to calculate the misalignments of optical system, and the model was then simulated. Finally, practical alignment was tested. Result shows an increment of system MTF from 43% to 60% after the compensation process.

Abstract: Theoretical and technical problems in retrieval and deployment of spatial tether are analyzed in this article. Several movement state of take-up mechanism requirements are analyzed, and then adaptive mechanism using differential double-drum is proposed. Differential equations of motion are established in the case of bidirectional tether retrieval. The results via numerical calculation of an example show that the bidirectional reeling double-drum mechanism is very effective and well adaptive.

Abstract: Frequent start and stop and complex unstable environment causes edubot--micromouse based on single MCU cannot work properly, especially in fast exploration and dashing; This document explains and demonstrates how to design a edubot--micromouse based on MCU+FPGA . Motor control results and micromouse navigation pictures illustrate the micromouse prototype can be very good to meet the fast exploration and dashing requirements.

Abstract: Reactive power compensation utilizing SVC and STATCOM is the most important method to improve power quality. In this paper, the technical features of SVC and STATCOM are introduced and then a power system in enterprises is used as an example in order to show effectiveness of SVC and STATCOM. Determination of location where SVC and STATCOM should be installed and their capacity is important for enhancement of power system voltage stability. Considering different kind of failure in power grid in enterprises, this paper gives analysis of voltage changes and motor load losses of the power system, on the meantime taking into account of the influence of external grid failure. Based on PSD-BPA software and mathematical model, the optimal design program of reactive power compensation utilizing STATCOM is determined by comparing effectiveness of SVC and STATCOM. Test results show very encouraging result.

Abstract: This document explains and demonstrates how to design two axes micromouse PWM generator based on FPGA, the top module based on FPGA is divided into Motor Control module, address decoder, mux output and bi-directional buffer module. Simulation results of every module illustrate the design can be very good to meet the fast exploration and dashing requirements of micromouse.

Abstract: Milling tool wear identification literature study, some information characteristics was generated by a number of possible milling tool wear. In theory, the characteristics of each of the information under the milling tool wear has a certain probability of occurring. DS evidence theory, belief functions used to express the size of the probability. the milling tool wear objects was identified through multi-sensor testing, then, measured the information features of each sensor belong to belief functions was obtained, then use the DS combination rule for information fusion, information fusion can be milling tool wear characteristics belong to the reliability function, the final determination based on certain criteria for determining status of milling tool wear type and size of tool wear.

Abstract: Multi-agent based active noise control (ANC) is investigated in this paper. An enclosure consisting of two flexible plates is discussed. The noise control problem is decomposed into several local control problems on the basis of the dominant structural modal. Each local control problem is solved by an intelligent structure, i.e. agent control unit (ACU). The ACU includes sensor, actuator and controller. The relationship among the ACUs is negotiated by a coordination object. The architecture of multi-agent based active control is established using the coordination object. The control system can work smoothly in dynamic environments. It has the flexibility and robustness. The simulation results indicate that the good control performances are attained.

Abstract: Low carbon green living environment in our life play a very important role. With the rapid development of Internet technology and the increasingly mature, the traditional lighting system is developing rapidly towards intelligent lighting control based on Internet of things, especially in public places, the electricity control, such as libraries, museums, etc. In this paper, based on the Internet of things technology combined with humanized design a set of intelligent management library intelligent lighting energy saving control system. The wireless sensor network to collect environmental information is combined with artificial management information, the main control system can carry on the dynamic control of library's energy consumption, and realize the system energy saving purpose. After experimental verification, the energy-saving control system designed in this paper can according to the changes in the environment of intelligent stability control in the reading room lights brightness. The structure is simple and has achieved the purpose of energy saving.

Abstract: In this paper we propose a novel GPRS based remote environment surveillance system. This system incorporates a gateway node (with two processors of MG2455/F48 and TR800) and numerous sensor nodes (with the MG2455/F48 as the processor, as well as the SHT11 and TSL2561 as the data collection module), where the sensor nodes collect the environment data such as temperature, humidity and luminance, whereas the gateway node take responsible for the verification of users authority, the data exchange between legitimate user and system via SMSs. To verify the performance and availability of our proposed system, we conduct several experiments, the result depicts that the system is applicable to many kinds of occasions with high demand for environmental monitoring as its effective acquisition, little time delay, and great space for expansion of functions.

Abstract: From a practical point of view, a closed-loop feedback system that is unstable is of little value. Many control systems are subject to extraneous disturbance signals that cause the system to provide an inaccurate output. The Routh-Hurwitz criterion ascertains the absolute stability of a system by determining whether any of the roots of the characteristic equation lie in the right half of the s-plane. This study concludes with a stability analysis based on the Routh-Hurwitz method.