Applied Mechanics and Materials Vols. 278-280

Abstract: Brushless DC motors (BLDC) are widely used for many industrial applications because of their high efficiency, high torque and low volume. This paper presents the PID control for BLDC Motor, because good control effect cannot be acquired by using the traditional PID control in the non-linear variable time servomechanism and it is difficult to tune the parameters and get satisfied control characteristics, some intelligent techniques should be taken. Wavelet Neural Network (WNN) was constrictive and fluctuant of wavelet transform and has self-study, self adjustment and nonlinear mapping functions of neural networks, So, a wavelet neural network self-tuning proportional-integral-derivative (PID) controller was proposed. The structure of WNN and PID tuning with WNN was presented and the equivalent circuit of BLDC and its mathematical models was analyzed, the simulation was taken with new method, the efficiency and advantages of this control strategy was successfully demonstrated which can applied into BLDC control system.

Abstract: A 30kW interpolation permanent magnet synchronous motor(IPMSM) for electric vehicles is discussed in this paper, the phase current sliding mode observer control strategy is proposed, by means of adjusting the current error between the target and practical phase current of the motor, and according which the designed current sliding mode observer output voltage. An improved index reaching law control method is shown, the switching gain can always maintain smaller and converges to zero when imported time-varying factors to it. The inherent shortcomings of the index reaching law can be overcome by using integral sliding surface with integral separation and importing the boundary layer method, effectively weakening the system buffeting.

Abstract: We deal with the problem of moving control of an automatic guided vehicle (AGV) in a specific environment, that is, a crematorium which has a narrow indoor environment. In such an environment, an AGV itself can transport a dead body to a designated furnace safely. A well-known method of burying guided lines under the floor is not proper to such an environment because its floors are made of expensive materials, i.e., marbles, and thus it has no flexibility. In this paper a new method of precision control of the AGV using infrared ray sensors is presented. With this approach, the AGV itself emits infrared rays to the landmarks adheres to the ceiling to obtain a moving direction and then moves to that direction by correctly recognizing them. One of the typical problems in a crematorium is that dead zone and overlapping zone may exist due to radiation and reflection of lights. To resolve this, an algorithm of recognizing double landmarks is applied to reduce its sensing errors. In addition, when the AGV changes its direction to enter the furnace, a precision control of the wheel moving trajectories of the AGV under acceleration and velocity constraints should be needed. Our proposed method formulates and simulates the desired trajectory of the AGV and then modifies it to compensate delay dynamics and vibration. The effectiveness of the proposed method was demonstrated in a real crematorium.

Abstract: The more and more extensive application of multiprocessor system to mobile devices has been achieved. The battery-aware voltage scaling algorithm for multiprocessor system was addressed in order to minimize the battery capacity consumption. The proposed algorithm generated task schedule by task assignment, discharge judgment and slack allocation. Based on the characteristic that the battery discharge could be divided into linear discharge and nonlinear discharge two phases, the slack was distributed by different manners during different discharge phases. The simulation results show that battery capacity consumption for the algorithm has relations with battery nonlinearity.

Abstract: For some nonlinear complex control objects, conventional PID control is not able to obtain satisfactory control characteristics because of its inherent defaults. As a new controller based on PID control technology, auto disturbances rejection control(ADRC) breaks through the limitation of the former technology, at the same time maintains its advantages. In this paper, these two methods are used for nonlinear object −−two-step water tank respectively. Simulation and application results prove that ADRC controller works with better adaptability and robustness when controlling the nonlinear time-delay object, and is easier to achieve the control of no-overshoot and no-static-error.

Abstract: This document introducting a based on PLC and intelligent instruments control system of annealing furnace, the control system is on the basis of the PLC configuration software to monitor real-time control of smart meters, interchanging data between them, in order to achieve automatic control function together. Make the control system is safe and reliable, high accuracy [1].

Abstract: In this paper, a concise nonlinear robust control scheme based on the frequency domain is proposed. Compared with the arbitrary selection of weighting function in classical H_∞ mixed sensitivity robust control design procedures, the CGSA methods gives a relatively more straightforward and concise design procedure for MIMO robust control problem. In the simulations, the CGSA is applied to an integrated rudder and fin control loop to indicate that the integrated rudder and fin CGSA control scheme is very feasible for future practical application.

Abstract: Macro-micro stage can achieve large travel range and high precision positioning. The macro stage is driven by voice coil motor (VCM). The micro stage is actuated by the piezoelectric (PZT). The positioning theory of macro-micro stage is described. In this paper, the compensating method of point-to-point (PTP) positioning is divided into two types: compensation before steady state (CBS) and compensation after steady state (CAS). The different control strategies are applied to meet CAS and CBS. Because of the structure of macro-micro stage and the saturation of micro stage, switching control plays an important role in realizing high precision PTP motion. When the error of the macro stage is less than the threshold and also the system meets the switching conditions, the compensation signal is sent to the PZT control loop for high resolution compensation. Finally, the numerical simulation results show that the positioning accuracy of dual stage is higher than single macro stage and can reach nanometer scale.

Abstract: To effectively monitor the operation of feeding conveyer in automatic tomato selection assembly line and to avoid loss caused by machine’s breakdown, monitor control system was designed for the production line. The hardware circuit was designed using LOGO！ as the core control device, then the software was development. And two working modes (automatic start and manual start) were assembled in the system. Finally, the system was tested in the tomato automatic sorting assembly line. The results indicate that the system can start the machine quickly and respond immediately to break-down.

Abstract: The wireless water-saving irrigation controller based on the micro CC1100 is designed to save irrigation water and enhance the utilization efficiency of water resources. The system, which uses soil moisture sensor FDS-100 and digital temperature-humidity sensors AM2302 to collect soil moisture and air temperature and humidity of the crop growth environment, has realized remote online monitoring of soil moisture and accurate irrigation control through the wireless data transceiver utilized by CC1100. Practices show that this controller is reliable, easy to operate, and can meet the requirements of precision irrigation.