Applied Mechanics and Materials Vols. 365-366

Abstract: Coal mine safety accidents lead to national casualties and economic losses, to the greatest extent reduce accidents, it is a worldwide problem. In addition to strengthen safety management, security monitoring, there is a better way is to enhance the mine industrial automation process. The use of intelligent industrial robots in the mine, it will improve the efficiency of coal at the same time, and greatly reduce the risk of injury or even can effectively avoid accidents. This paper is to study one intelligent industrial robot which can use in the mine, and it use state-of-the-art motor control technology, and can operate it to high-risk job in the control room. In this paper, a detailed study of the specific structure of the industrial robots, and designed a complete set of control scheme.

Abstract: This paper establishes the simulation model of a load-imitating test equipment for a hydraulic drive unit of a quadruped bionic robot, analyzing load force changes during the work process of the hydraulic drive unit, and researching load-imitating characteristics. A Strategy based on feed-forward decoupling control is proposed to realize the decoupling between the position system and the force system of the load-imitating test equipment to improve load-imitating precision. The results show that control effect of feed-forward decoupling control is satisfactory, and this control strategy can effectively improve load-imitating precision of the test equipment. The research above can also provide theoretical foundation for test application of the hydraulic drive unit.

Abstract: Based on the basic characteristics of fuzzy control theory and the general PID controller, a fuzzy PID controller is proposed for brushless DC motor (Brushless Direct Current Motor-BLDCM) control.The output signal PD-type is used as the input signal of fuzzy controller.Fuzzy PID controller can be adaptively adjust the PID control parameters to achieve operational control of BLDCM control system. Simulation results show that, compared with the general PID controller, fuzzy PID controller shows better characteristics on the respects of dynamic response overshoot and stability regulation time.

Abstract: A backstepping approach, combined with adaptive fuzzy sliding mode control, is used to design a missile autopilot in this paper. The proposed scheme separated the plant into two subsystems, such that single controllers can be designed and therefore the stability of entire system is reached automatically. The single control laws are designed using sliding mode control based on the Lyapunov stability theorem, and the adaptive law is derived to adapt the value of the lumped uncertainty in real-time. Moreover, with the universal approximation ability, an adaptive fuzzy system is used to approximate strong coupling nonlinear dynamics of the missile during large angle-of-attack flight and provide robustness to parametric uncertainties in the missile aerodynamics.

Abstract: According to the problems existing in the substation automation, this paper is study by data acquisition method of cycle distance transmission. First, Expounds the basic knowledge of CDT, including frame structure, information word, calibration method; Then, the design by hardware structure of the data acquisition system and the basic model; Finally, study by data acquisition control, including communicated methods and main attribute of MSComm control, CommEvent attribute, MSComm attribute to set, communication error setting. Using this paper of the research of design grid data acquisition software, can realize the data standardization management, improving work efficiency and economic benefit, meet the needs of enterprise modern managements.

Abstract: This paper presents a new method for controlling the gap distance in an EDM machine. Existing gap width control method using PI controller does not perform efficiently in a highly nonlinear and time-variant process such as EDM. In this method, constant tuning of the PI controller is required to achieve a stable and efficient EDM process. The new gap control method present in this paper uses an artificial intelligent type 2 fuzzy logic control to control the gap distance between the electrode and the workpiece. The main advantage of this proposed method is its robustness that would rid the practitioners from the tedious tuning job and would provide the industry with better accuracy and confidence in the control performance.

Abstract: For the deficiencies in the on-site skill assessment of crane operators, an on-site skill examination system for crane operators based on distributed cooperative control technology is designed. The functions and implementations of various monitoring sensor module, wireless data acquisition system and the hosting control center are discussed. This system can help to improve the scientificity and fairness of the assessment work of crane operators.

Abstract: Incremental PID has its shortcomings: great integral truncation effect, static error and spillover affect. In the control system, the controller system is required having a quick response speed, and also a certain anti-interference ability. When adopting the improved differential PID control algorithm, only the output differential is made, instead of the given values. So, when a given value changes, the output will not change, and the controlled quantity change is usually mild, in which case the control accuracy is improved, and the system dynamic characteristics is greatly improved.

Abstract: High technology for an automatically adjustable shearer is key to improving the automation degree of a fully mechanized working face. In order to obtain the shearers pose information and coal machine angle space formulas, the shearer status under real working conditions was analyzed based on data from a triaxial accelerometer and single-axis gyro.

Abstract: A variety of driving mechanisms are used on a large amount of equipment working underwater, and the driving mechanisms mostly rely on motor to work. But the seal of the motor working underwater is a thorny problem, especially in deep sea. Thus we propose a new concept of underwater drive mechanism. In the device, the motor and the shaft are sealed up overall by a watertight house. The rotation of the inside motor makes the whole sealed device to rotate through the internal toothed gears, which makes it true that the motor shaft realizes driving function by static seal. And this increases the reliability of the seal, eliminates the friction of motor shaft, and improves the mechanical efficiency. This paper introduces the building of this new underwater driving mechanism, and carries on the comprehensive analysis and its working performance to lay the foundation for its application.