Applied Mechanics and Materials Vol. 203

Abstract: In the complex ship noise environment, the effective signal should be extracted before the leakage signals of acquisition which often mix with noise signal do further analysis. So the signal processing method based on db5 wavelet transform is put forward. In order to make the signal-to-noise separation and restore the original signal waveform, wavelet de-noising processing is done for the pressure sensors receiving signal. Finally, the negative pressure wave method is used to find leakage location of ship pipeline. The experiment proved that the signal processing method based on db5 wavelet transform is suitable for complex ship noise environment and improves location accuracy.

Abstract: Based on the laser technique, a method of detecting liquid surface tension was proposed. The relation between the laser diffraction pattern and liquid surface tension is derived. In this experiment, laser diffraction patterns from liquid surface waves were collected .The experiment results show that the proposed way is feasible.

Abstract: Temperature measurement methods always including contact method and non-contact method, generally speaking, non-contact method used for detecting remote measuring objects temperature, in especially as to particular occasions such as factory workshop. This paper provides a system based FPGA(field programmable gate array)for accurate measure and analysis long distance objects temperature. The system could be used in process of industrial produce fabrication.

Abstract: New impulse detection and filtering algorithm is proposed in color images. Based on fast peer group filter, the proposed filtering algorithm uses different iteration times to complete filter according to different impulse noise density. The extensive experimental results show that the proposed scheme provides better performance than many of the existing vector filters. Meanwhile, the proposed approach is simple and practical for real-time application.

Abstract: Contemporary building automation system (BAS) is realize automatization control and management system through to the modern advanced computer technology, communication technology and control technology, and other comprehensive utilization,which can realize the intelligent buildings all mechanical and electrical equipment and the energy equipment of the united network control connection, so as to achieve the whole building environment system of monitoring and management, to it’s best for people to create a comfortable safety, high efficiency and energy saving life environment. In this paper, there’s a deep discussions of the building automation system of composition, development and the present situation; and the key technology of the present situation and development prospects, and we set a plan based on the technology of building automation system LonWorks solutions, and expounds the concrete realization of key technologies of the system, based on the development of the host general much input/output intelligent node module.

Abstract: This review gives the basic concept、mechanism、and algorithm of automatic controlling theory，puts forward some views for the design of automatic control system，designs a new model for the rotational speed control of the stepping electrical machine.

Abstract: the programmable logic controller (PLC) is the control device which is the most commonly used in the industrial control system. It's popular among the control system designer and maintaining staff on account of its good reliability, anti-jamming and practical application. This paper studies the PLC control technology application in motor VVVF system, firstly we introduce the basic working principle and features of the PLC, then supply some technical guidance for the PLC control technology applications combined with DC motors and AC induction motors in PLC control system.

Abstract: the IOT (Internet of Things) technology is another major breakthrough in the contemporary information technology, a new information technology outcome after the computer and Internet technology which is very important to change the way of our future life and production. This paper studies the composing principles of the IOT system and analyzes the application of RFID (radio frequency identification) technology in the IOT in detail.

Abstract: For the solution of an infinite number of LMI in the parameters trajectory of LPV system, a method based on the tensor product transformation is proposed to tranform the LPV system into the convex polytopic structure. Firstly, discretizing the given LPV system within the interzone of the changing parameters and storing it into a tensor, and then using higher order singular value decomposition (HOSVD), discarding smaller and non-zero singular values and their corresponding singular vectors, reconstructing the reduced-rank tensor to obtain a finite number of LTI vertex systems. The final example shows that the convex polytopic system obtained by this method can substitute the original LPV system within the allowed error.

Abstract: This paper researches wireless RFID routings in Internet of Things based on the idea of quantization. The researches include the obtaining of routing contexts, the measurement of contexts in evaluating the performance of routing, methods for controlling the quantification of contexts, the realization of a perceptive computational model, the mergence of the security policies. Its goal is to construct a precise lightweight and perceptive model of wireless RFID routing protocols in Internet of Things, and to lay a foundation for accelerating the developments in Internet of Things.