Advanced Materials Research Vols. 328-330

Abstract: The design of Digital Double Close-loop DC Speed Regulation System which we introduce in this article is based on the numeric control scheme, and using ATMega8 as the main controller, also with PI arithmetic, so as to construct a double close-loop DC Speed Regulation System with inner loop of current feedback and outer loop of speed feedback. The approach of motor speed regulation is through the voltage regulation. Experimental results show that the system has robustness, fast and good tracking performance.

Abstract: Automatic directional excavation technology in the coal mine laneway is the important research direction of integrated excavation project. Shovel and support bracket are the most key parts for keeping roadheader body stable in excavation. This paper studies the control ability and extreme position of boom-type roadheader’s shovel and support bracket, to calculate the adjustable vertical angles rang which is realized by shovel and support bracket, expanding roadheader’s automatic compensating excavation ability, meanwhile ensuring body stable. Vertical angle is one of the four kinds of basic body pose deviation parameters. This study is the research basis for the accuracy analysis of boom-type roadheader’s directional excavation. Because the depth that shovel and support brackets’ tip compress into laneway ground, is mainly determined by laneway ground hardness and body weight, and can’t be calculate accurately, paper’s end gives feedback control application of shovel and support bracket according to laneway conditions.

Abstract: In electrolytic aluminum production processing, the measurement and control of alumina density is one of the three most important control aims. However, due to alumina density can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina density control method is very important. In this paper, alumina density is controlled by single neural adaptive PID controller in electrolytic aluminum production processing, and alumina density based on intelligent characteristic model is established by using the intelligent characteristic model method, takes the model as the control model, alumina density is controlled combination of the two advantage, which achieve a good control effect.

Abstract: This paper develops the visual detection system of the button battery based on Labview to resolve button battery surface’s quality. To obtain continuous image acquisition process, we can use IMAQ Grab Setup.vi function to initialization before each image acquisition, and use IMAQ Grab Acquire.vi function to capture image. Here one-dimensional array can be got from the input port of the vidicon. And then the array is binary processed and denoised to prevent the small drop point being fat in the expansion processing. To get the white points of scratch image from the battery, it is necessary to create a template and make a logical subtraction to the two images. When the white points are greater than the set threshold, the battery is unqualified. The detected results are transferred to PLC in digital form and the pneumatic components are controlled by PLC to remove substandard products. Used by battery manufacturers, this system achieves good results.

Abstract: The traditional mine accumulator locomotive usually takes the DC motor for its power source. And the series-wound resistance method is usually used in its speed control. With the development of power electronics technology, the AC drive system based on power electronic converters can be realized. Especially after the realization of large-scale integration and compmer controling, the performance of AC variale speed has been improved a lot. In operation, the mine accumulator locomotive not only works in frequent starting, breaking, accelerating and decelerating conditions, but also has to adapt to the bad pavement. The AC asynchronous motor has simple stmcture, sturdy and durable, and it could save power by notusing resistance when it was used in speed control. With this characteristics, the AC speed control system has the feature of fast response and high overload capacity. The AC speed system is the key factor for efficient operation of mining accumulator locomotive. Compared with the traditional DC speed system, the principle of DTC is introduced in this paper. And the advantage of operating performance and economic benefit of mining accumulator locomotive with AC speed system based on DTC is analyzed from practical application.

Abstract: In this paper, we compare the shuttle type passive control system and the existing technology in detail firstly, what is called passive control is a technology which the passive shuttle control system relies on the energy from the system itself or our natural cycle, such as the gravity flow, the pressure flow, the pressure difference to achieve self-regulation and control without other outside power and active devices. And then we introduce the new shuttle type control units including shuttle type return valve, shuttle-type exhaust and air-adding valve, and the adjustable difference flow pressure safeguard and their applications using several examples, which shows that the shuttle type control series valves are latest best choice for the modern pipeline conveying engineering with simple frame, lost cost and high reliability.

Abstract: The development effect of steam flood well is influenced by the combination of the following parameters: injection speed, dryness fraction of steam, temperature of injection steam, and bottom hole flowing pressure. Taking the advantage of adaptive simulated annealing genetic algorithm with the characteristic of fast search and globally optimization, and combine with the mathematical model of the steam flood well. Maximization of the vapor-liquid interface factor is the target to optimize injection production parameter of the steam flood well, the results of the optimization shows that cumulative oil production increases obviously.

Abstract: Studies on orientation mechanisms of the auditory systems and research of bionic structures of subminiature creatures, especially of the parasitoid fly Ormia Ochracea which has a remarkable ability to detect the direction of the incident sound stimulus despite of its tiny body size, may provide preferable solutions for the miniaturization of acoustic localization structure. In this paper, the bionic acoustic sensing device are set up and taken as the research object to find feasible orientation mechanisms, and experiments on bionic acoustic sensing device are conducted after the test system has been established.

Abstract: In consideration of the importance of phonetic system, the oral broadcasting systems have appeared in more and more places such as subways, bus stations and supermarkets and so on. The aim of this paper is to introduce a high performance speech decoding system based on Cortex. On the basis of introduction to each part, the function of main chip has been described in detailed. The interface of main chips has been defined. The software structure is also discussed. The system adopting Cortex as microprocessor, 5605 as the MP3 decoder chip, can decode MP3 and WMA files stored in SD card. Equipped with a character LCD display module, the system performance has greatly improved by using Cortex processor.

Abstract: This paper detailedly illustrates how to design an anti-sway controller of overhead crane for eliminating pendulum of hook-headed. First of all the paper uses Lagrange Equation in analytical mechanics to obtain a mathematical model of crane motion system in three dimensional space. Then the paper advances a new control method and designs an anti-disturbance tracking controller based on servo-compensator and stabilization compensator for eliminating pendulum of hook-headed and accurately fixing position. In general, it is difficult to design an appropriate control law because of the crane motion system’s nonlinearity and strong coupling. However, the control method the paper put forward is simple and effective, and ensures the transient state performance of closed-loop system preferable and stable. The paper will introduce the design steps of anti-sway controller of overhead crane and give a satisfying simulation result, which are new and original in this paper.