Applied Mechanics and Materials Vols. 220-223

Abstract: An intelligent vehicle anti-theft alarm system has been designed with DSP technology and GPRS technology. This system is mainly composed of a signal collection system, alarm system, control system, communication system and the four wheel locking system, which can realize the safety status monitoring of vehicle after parking, the dialogue of people-vehicle under unsafe conditions and tracking and positioning of the vehicle after stolen. But the system has a wide range covering network, information transmission speed, low cost and the use cost , small blind area and multiple anti-theft functions and so on. A new way and thought has been provided for automobile anti-theft protection.

Abstract: An intelligent fire alarm system has been designed based on MCU. The system is mainly composed of fire detector, fire controller and radio communication. This system can accurately display the environmental temperature. When the fire occurs, the system can alarm and remind of the staff on site working. At the same time, it can also display fire graphics, time, and temperature on the LCD and control the system very good.

Abstract: The active power filter (APF) is a dynamic harmonic filtering equipment. The time delay is unavoidable and it has a great negative influence on the stability of the APF system. Based on the introduction of its topology and control strategy, the mathematical model of APF with time delay is built. And the model is a time delay systems with bounded nonlinearity, so a new delay dependent stability criteria is derived and formulated in the form of linear matrix inequality (LMI). The maximum allowed time delay is solved, and the relationships between it and some other parameters are investigated and simulated. The result can be as a reference in the future work.

Abstract: A six cubic meter sound insulation chamber is designed based on the principle of double-layer wall sound insulating and porous absorption with the characteristics of stored grain insect action sound. With 3 mm thick plywood as wall material, double - layer spacing 0.08 m, the outer wall being bored, each aperture 1mm, average spacing 1.5 cm, and the hard sound-absorbing material being filled in the two layers, a quasi - double layer perforated structure is built. The ambient noise is uniformly insulated between 125Hz and 2000Hz, and the average sound insulation is about 22dB, and it meets requirements of stored grain insect action sound for the spectrum and SPL. The result shows that the sound insulation chamber has the advantages of small size, economy, and good sound insulation effects.

Abstract: The safety performance of vehicles are divided into two types, one type is called" active safety", i.e. before the accident prevention, prevention measures.The other type is referred to as" passive safety", i.e. when the accident happened, the vehicles and personnel to take protection measures. People usually focuses on the passive safety of this idea seriously quite, people now pay more attention to the active safety design. This paper introduces several kinds of vehicle collision avoidance system ranging modes, and discusses the intelligent collision warning system.

Abstract: In order to solve the problems about testing and analysis for the optimization problem of the mountain orchards transport aircraft operating parameters and structural parameters, we build a transport aircraft control test platform. According to actual needs, for complete the circuit design,select the appropriate frequency conversion motor, frequency converter, PLC, and other critical hardware.Using fuzzy PI controller, in the Step-7 authoring environment to compile, complete the PLC programming design; Complete interface design in the in Eviews editing software EV500.After constantly adjust, in conditions for a variety of conditions like stoping in an emergency, an emergency starter, speed transient change, instantaneous change of goods bias, cargo rolling random, the system can be stable operation, uniform speed, experimental platform vibration is very small, the vibration of the truck itself is also very small,which can meet the test requirements enoughly.

Abstract: To present a precise and efficient algorithm to solve planar straightness error problems, a machine-learning approach to evaluate planar straightness error was presented in this paper. According to the similarity between the least envelope zone and the support vector regression model, the SVR-based method was developed to solve the problem of straightness error. The evaluation method was compared to some existing techniques. According to the results from three datasets, it is shown that the SVR-based method can provide precise and exact values of planar straightness error.

Abstract: It introduces the application of electromagnetic wave propagation principle and microwave technology in the earth's surface water monitoring. On the basis of the operating principle of real-time microwave monitoring system, we have got the corresponding absorption curve through the contrast experiments on pollutants. Research the structure of microwave real-time monitoring system in the frequency of 200-2000MHz , discuss the concrete design and realization .

Abstract: Walking assist using Functional Electrical Stimulation (FES) has been studied for a quite long time to help paraplegic persons overcome their walking impairment. One of the problems of these devices is how to cope with individual dependent, time-varying, and nonlinear user characteristics and external disturbances. In this study, Feedback Error Learning (FEL), a scheme that integrates feedback and feed-forward control, was applied to FES control. In this study, a FES experiment to human subjects was done to investigate the applicability of this system. The data obtained from the FES experiments were used to construct a new simulation model for further investigating the effect of FES in different condition. The results showed the usability of the FEL scheme for different FES control strategies.

Abstract: This paper introduces a Radio Frequency module based on the nRF905 all-digital granary wireless temperature monitoring system. The whole system adopts DS18B20 to measure the granary temperature, measurement data is processed by microprocessor MSP430 next, then carried out by the RF module nRF905 remote transmission, and displayed the measurement data through JHD1602. In addition to showing the temperature of the granary and alarming, the system can set up or modify the working parameters through keyword at control terminals. This system is characteristic of multi-point measurement, high-precision, wide rang of temperature monitoring, stability good and alarming timely, it may also apply in other related temperature control system, the versatility is very strong.