Advanced Materials Research Vol. 1028

Abstract: As the key equipment in coal-fired power plants, the optimal control problem of ball mill is an important factor affecting the efficient operation of the mill. In this paper, the output model, energy consumption model and unit consumption model of coal pulverizing system are built on the basis of analysis of ball mill running condition. The unit consumption model is used as the genetic algorithm fitness function. The outlet temperature, practical ventilation and coal load of ball mill are chosen as the optimization variables. The algorithm model is built to solve the multi-objective problem of ball mill.

Abstract: Since China's reform and opening up, with the rapid development of our country economy, people living standard rise, the progress of science and technology as well, Modern surveying and mapping technology plays a very important role in both subject theory, technical level and in terms of application scope, have taken place in the larger changes, to solve the problem of social development and the national economy. In this paper for the application and development of surveying and mapping technology is also discussed and prospected.

Abstract: The new energy vehicle intelligence anti-collision system, is a new energy vehicle safety assist device , can timely and intuitive display the obstacles of new energy vehicles’ around, help the driver to remove the dead angle of vision and the flaw of sight, in case of emergency, intelligent control of brake. The research of this paper is that new energy vehicle intelligent anti-collision system of a kind of low cost, high precision, miniaturization and with a liquid crystal display and sound , light alarm function center on the single chip AT89S52 , the product is developed according to the principle of ultrasonic ranging, using the temperature compensation technology, power on self-checking technology and optimized hardware and software technology, sent the measured results to the liquid crystal display, in case of emergency, intelligent control of brake, improves the safety and efficiency of new energy vehicles.

Abstract: Boiler steam temperature controlled object has characteristics of full scope nonlinear and time-variable, which bring more difficulties in modeling and designing control systems. Adopting Jordan block in broad sense and algebra equivalence transform method, the description of transfer functions paragraphed can be transformed into that of state-space with changeable parameters. The researches on steady robustness of three tipical control systems shows that: to the high order inertia nonlinear and time-variable controlled object described by the same set of transfer functions, the Luenberger function observer established according to its any algebra equivalence state-space description, there exists a solve matrixwith order satisfy the Sylvester matrix equation under some conditions. There presents sufficient conditions to full scope asymptotically stable of three types boiler steam temperature control systems and the regulators’ steady work points. The simulation tests and engineering practices prove the correctness of theoretical analysis and steady robustness of the systems.

Abstract: According to the vehicle interior low frequency noise existing, vehicle interior adaptive active noise control strategy is established based on the FXLMS algorithm, designed the core circuit module active noise controller, including the vehicle interior noise signal amplification module, a main control unit, audio power amplifier module and power module, completed development of the controller hardware, and programming the control software system; using this system, on vehicle driving conditions vice driver left ear position low frequency noise cancellation control in the steady state, the 8.5 dB (Lin) and 10.2dB (Lin) the amount of noise reduction.

Abstract: With the continuous development of video detection technology, the video analysis technology based on campus security has become an important part of the construction of safe campus. As the college students still are a group that has poor ability of security protection, campus security issue is closely related to the stability of society and family happiness, and has become a topic of concern to the whole society. The intelligent vision-based campus public safety monitoring system is an important means to achieve security monitoring, it can automatically analyze the video image sequence, and detect, track and identify objects in the monitoring scene without human intervention, and make high-level understanding and analysis of behaviors on this basis. Most of the existing visual monitoring systems can collect and store video data, and the real-time event detection task can automatically be generated through background analysis. Intelligent visual monitoring system should not only be used for accident investigation, but also be used to prevent potential disasters and accidents. The system is consisted of system management platform, event mining and analysis, monitoring and extraction of moving targets, forecasting and tracking targets. The paper makes an in-depth study on the application of intelligent visual detection technology on campus. Based on the intelligent visual video analysis, hidden Markov model is adopted in the paper for video event detection and analysis, motion features and shape features are taken as the observation data, and segmentation method is adopted to analyze the influence of video viewing height and angle on the detection result.

Abstract: With the development of the distributed power system, the paralleled switching mode power supplies are becoming more and more important for large current load. However, paralleled system usually requires load sharing to equalize stresses, and while a lot of techniques have been used, there are many compromises between complexity and performance. This paper introduces the superiority of the power supply modules in parallel, discusses both the advantages and disadvantages of the usual current sharing methods. Finally, some suggestions to enhance redundancy and reliability for current sharing modules have been proposed.

Abstract: In the TV program production, the Media Assets Management system should have integration of production, material management, browsing, information management, friendly interface, standardized operation and open system and other functions. The MAM system consists of the Media Assets Management server, WEB application server, streaming media server, cataloging workstation and data streaming tape library. The MAM system in the Whole station network should be an extended full service platform to achieve unified management of various media assets automatically.

Abstract: This document analyzes the limit of duty circle in a conventional two-transistor forward DC/DC converter which is disadvantageous to efficiency. To solve this problem, the resonant reset technology is introduced to the converter. The enhanced two-transistor forward DC/DC converter is able to increase its duty circle exceeding 50% and the resonance voltage is constant which is propitious to heighten the efficiency. Simulation is implemented for the purpose of validating the feasibility.

Abstract: This paper briefly introduces the function of LC three point oscillation circuit and the study of the composition and performance parameters of capacitance three point oscillation circuit, inductance three point oscillation circuit and modified capacitance three point oscillation circuit based on the Multisim simulation software.