Applied Mechanics and Materials Vols. 446-447

Abstract: In this paper, the CVT shifting control system based on vehicle operating conditions is modeled and simulated using MATLAB/SIMULINK. The modeling stage begins with the derivation of required mathematical model to illustrate the CVT shifting control system. Then, Linear Quadratic Gaussian (LQG), Proportional- Integrated-Derivative (PID) and Pole Placement are applied for controlling the shifting speed ratio of the modeled CVT shifting system. Simulation results of shifting controllers are presented in time domain and the results obtained with LQG are compared with the results of PID and Pole placement technique. Finally, the performances of shifting speed ratio controller systems are analyzed in order to choose which control method offers the better performance with respect to the desired speed ratio. According to simulation results, the LQG controller delivers better performance than PID and Pole Placement controller.

Abstract: A multichannel computer screen recording system based on Field Programmable Gate Array (FPGA) and Advanced RISC Machines (ARM) is introduced in this paper. This system has both Video Graphics Array (VGA) and Digital Video Interface (DVI) inputs, and supports the resolution of 1920x1080 and any common resolutions that do not exceed 1600x1200. The system can simultaneously record VGA and DVI signal by using the FPGA as the MUX of VGA and DVI. The experimental results showed that the algorithm used in this system, which combined the wavelet transform and listless zerotree entropy coding, achieved significantly higher quality of the decoded images than JPEG with the same compression ratio. The mapping of FPGA to SRAM method ensures the bit stream band width between FPGA and ARM. With the compression ratio of 50, the system can record 20 frames per second at the resolution of 1600x1200.

Abstract: The anxiety of the humans to eradicate the difficulties of people landed up in the technological advancements. But the present scenario in India shows that navigation of blind people is a difficult task. The blind people have been using sticks and dogs for their navigation for the past decades. To make them autonomous in their mobility we put forward our idea over the existence of voice commands (IVRS).Two issues have been discussed in this paper. (i)Their navigation has been instructed by the prodigious vibroactuators which could make their mobility in a glib way [1]. The vibrations sensed through haptic perception by the blind make them to reach their destination. Voice commands will be given along with the vibrations in order to make them comfortable [2]. (ii) Our proposal proposes an idea to detect the hindrances using Ultrasonic sensors and it alerts them.The idea has been levelled up with prototype which gave the better results which has been illustrated in this paper.

Abstract: Up to now, some technologies of neural networks are developed to solve the non-linearity of research objects and the adaptive control is implemented in many engineering fields, and some good results are achieved. Though the learning mechanism of neural networks is really unknowable, the importance of study ratio is widely realized, and some methods on modification of study ratio are provided. Improving the stability and increasing the convergent rate of networks by defining a good form of study ratio is the main target. A new algorithm named least disturbance BP algorithm is proposed to calculate the ratio online according to the output errors, the weights of network and the input values. The algorithm is applied to the control of an underwater vehicle. The good performance of the algorithm and the controller is demonstrated by the experimental results.

Abstract: Recently, with the rapid agricultural application progress in China, greenhouse control issues have been better addressed. The greenhouse control technology, as an emerging technology, is increasingly being widespread attended, and is gradually walking in the direction of constructing good quality, high output efficiency agricultural systems. In this new situation, we need to carry out market research, carefully research the greenhouse automatic control theory based on SCM technology, and design automation control system with best effect. The performance test result shows: This new system has a good usable performance, while related technology can provide a scientific basis for further research in the future. Keywords.Microcontroller; greenhouse automatic control.

Abstract: The thin metal plastic forming is an indispensable metal forming technology. Wrinkling is one of the common defects in plastic forming. If this kind of defects can be used properly, the formability of metal will be better. In this paper, the recent researches on the methods of identifying wrinkles, distinction of the useful wrinkles and harmful wrinkles, control and application of the wrinkles are summarized. The useful wrinkles are expected to improve the forming property.

Abstract: In the present study, the inertia moment and friction coefficient of direct current (DC) and permanent magnet synchronous (PMS) motors were calculated. Retardation experiment was carried out to calculate these values, and current, voltage and rotation values of the motor were calculated with the help of sensors. The measurement results were read with the help of a card designed using dsPIC30F4013, a high-performance digital signal controller. Power and torque values were calculated using the data transferred into the computer. Graphs showing power-velocity and velocity-time were drawn through the use of the values that were measured and calculated. Power-time graph was obtained by using these two graphs. To be able to carry out numerical procedures using the power-time graph created, curve fitting method in MATLAB was used, and mathematical expression of the graph was obtained. The kinetic energy stored in the motor was calculated using the mathematical expression mentioned, and the inertia moment was found using this value. The friction coefficient was calculated using the torque equation for stationary running of the motor at rated speed. The results of the simulation carried out in MATLAB by using the calculated coefficients and those of the experiment were compared.

Abstract: - Ant algorithms mimic the behavior of the ants where their important behavior is the ability to find the shortest path between food sources and their nest despite being almost blind. In the algorithms, as ants travel, they deposit a chemical substance called pheromone which; together with visibility values is used to make decisions. This paper investigates the effects of pheromone values on solving a routing problem; the capacitated vehicle routing problem (CVRP) In our approach, in order to produce a generalized approach, we developed an ant-based hyper-heuristic where pheromone and visibility values consider a non-domain specific knowledge. In this paper, we propose to provide all visited heuristics with some amount of pheromone. The distribution of pheromone values will be distributed proportioned to the performance done by the ants. This is to encourage the exploration of new edges that might lead to better solutions. We show that our results are better when compared to two other ant algorithm hyper-heuristics in the literature.

Abstract: The main research point is analysis of energy conservation on water cooling system in air conditioning engineering in this paper. After discussing the running characteristics for frequency water pump controlling variable speed and changing the flow. Then the cooling system adopts the new control method that constant branch pipe pressure difference in the most unfavorable end, and the water pump in parallel configuration, combined with the frequency conversion technology. At last from the experiment data and the actual test of the water cooling system, the energy-saving effect with variable pump of constant pressure control is validated.

Abstract: This paper developed an intelligent control system based on micro-computer in order to rope wire in a winch. It introduces the constituent parts and work principle of the system, analyzes moving direction rules of the rope-aligning device, calculating method of step number and speed regulating algorithm of the stepping motor. The system can adapt rope-aligning speed and distance to the wire diameter and the roller rotating speed. With good characteristic such as regulating speed quickly and smoothly, following roller rapidly and controlling itself intelligently, the system can be widely used in hoisting and lifting field.