Applied Mechanics and Materials Vols. 599-601

Abstract: The development and application of the reinforced concrete arch bridge has been several decades in China. However, the research on arch bridge is relatively slow in recent years, due to the limit of arch bridge’s dependence on geological conditions , the characteristics of its structure and construction technology . Especially ,many reinforced concrete arch bridges which were built after 1940s has been subjected to earthquake, flood or beyond design life. And there is lack of some corresponding researchs on assessment criteria. This paper aims to put forward some state evaluation methods and suggestions by the test and analysis of dynamic characteristics of reinforced concrete arch bridge. Keywords: reinforced concrete arch bridge; state evaluation; dynamic test; modal analysis

Abstract: Reinforced concrete piles are used when structures are constructed on soft ground, because it is necessary to transfer the loads into deeper strata with a sufficient bearing capacity. With the purpose of receiving more precise information about the pile features, four fiber Bragg grating strain sensors are embedded at different levels of the pile to measure the strain distribution during straining and pull-out tests. Test Pile vertical uplift static load test results show that, settlement of the test pile is steep variations, the steep rise starting point corresponding to the load of 3300 kN for the Uplift Ultimate Bearing capacity, the corresponding uplift amount is 12.45 mm; 4.4 m, 7.2 m, 11.0 m and 14.5 m sections axial strain were 115 με, 42 με, 6 με and-3 με. Maximum loading capacity is 3600 kN, the corresponding uplift amount is 30.13mm; 4.4 m, 7.2 m, 11.0 m and 14.5 m sections axial strain were 142 με, 61 με, 7 με and-1 με.

Abstract: Variable frequency speed control system hold good stability,more efficient,more energy conservation etc, so it has been widely used in the industrial areas,but the control strategy of traditional was difficult to achieve the desired control effect.This paper adopt particle swarm algorithm and BP neural network to construct the PID controller of PSO-BP neural network , the M-Files of PSO-BP neural network PID based on MATLAB through S-Function, and the mode of PSO-BP neural network PID variable frequency speed control system was established in SIMULINK platform.Simulation results show that the controller hold well robustness, follow and stability,and the dynamic characteristics of the original system was improved, the application value of this method in the variable frequency speed control system was proved.

Abstract: reinforced concrete structures reinforced protective layer deviation will directly affect the mechanical properties and durability of the reinforced concrete member, in relation to the structure of the use of safety and service life. The control to the protective layer of reinforced concrete structures include the following aspects: to do a good job of double sample, reinforced the blue prints.the design, production and installation of template engineering, reinforcing steel bar colligation molding process, placed, binding of fixed steel protective layer block and the requirements on the installation of the steel skeleton.

Abstract: In view of the present situation of scheelite smelting technology in China, we analyze the existing equipment and process problems,put forward the technique of mechanical enhancement of scheelite and alkali autoclave decomposition method combining with the temperature, the temperature of reaction kettle as the main object of control, the fuzzy control and PID control combined to design a two-dimensional fuzzy controller, through the MATLAB simulation results show that, the control effect, safety and feasibility of good.

Abstract: This paper tries to solve is how to design the four products (food, medicine, and health care products, cosmetics, medical devices) and transmission device and control system of temperature and humidity automatic acquisition of remote monitoring system, so as to solve the existing warehouse temperature and humidity monitoring devices commonly used in single type, stability is not high, poor, convenient the open problem of the poor.

Abstract: Viewing the health care problem facing the aging society, an intelligent wearable monitoring system is designed, which is able to collecting real-time data and analyze the data for physiological parameters for a plurality of monitoring object. The system, with CAN bus interface chip C8051F040 low power and wireless RF chip nRF24L01 as the core, collect real-time multiple physiological parameters of monitored objects through wireless mode, and send the data to the monitoring center through high reliability CAN bus mode, so as to achieve the intelligent home health care function.

Abstract: A vegetable greenhouse temperature detection and control system is described in this paper. The system is based STC89C52 microcontroller, using DS18B20 temperature sensor to detect real-time temperature, and using fuzzy control algorithm to control greenhouse temperature. Experimental results show that the system is cost-effective, long life and high degree of intelligence, has some practical value.

Abstract: By studying the occurrence and distribution of landslide disaster, remote monitoring system for landslide hazard was developed which using STM32 microcomputer and GPRS comunication technology. The changes of slope inclination, slope displacement and rainfall were acquained in real time. Experimental results showed that the use of the system on the slope of geological disaster monitoring is convenient and with stable performance.

Abstract: The testing principle of metal ultrasonic is using ultrasonic probe to scan in the work-piece surface, and acquire the probe of reflection signal which is sent to computer to analysis by the ultrasonic data acquisition card so as to detect and locate defects in surface of the parts. This system designed a unique scanning structure using the principle of ultrasonic detection and scans the hardware and software control system to realize internal shape detection for different shape of work-piece.