Applied Mechanics and Materials Vols. 278-280

Abstract: Based on research of the relationship between the industrial analysis of coal composition and the calorific value, a multiple linear regression - support vector machine model for predicting calorific value of coal is put forward. The training sample set is made up of the original industrial analysis data and calorific value. Then the preliminary predicted model is established based on multiple linear regression algorithm. At the same time, error compensation is achieved by the support vector machine amend sub-model. The final predicted value is the sum of the preliminary predicted model output and the error compensation. Experimental results demonstrate that the predicted accuracy of the integrated model is more accurate than the traditional predicted models.

Abstract: Aiming at the limitations of Port Crane structure stress monitoring methods, the structure stress monitoring system based on wireless signal transmission is proposed. The port crane structure stress of the key points were collected by resistance strain gauges. And the stress signal was processed by the monitoring MCU and then delivered to the monitoring center through wireless transmission. Firstly, the principle of the port crane structure stress monitoring system is proposed. And the implementation of hardware and software are discussed in detail. The proposed wireless monitoring system of port crane structure stress with a high accuracy and automation has a good practical value.

Abstract: We designed a tunnel surrounding rock(TSR) deformation automatic and real time measurement system .The long distance laser datum line instrument (LDLI) is fixed in stable ceiling rock of the tunnel. The LDLI transmits a bunch of lateral linear benchmark beam with small facula, and projects to the linear array CCD which mounted on instable surrounding rock. The linear array CCD detected the facula centre position real time. The facula displacement within a period is equal to the displacement of instable rock. We used the wireless data transmission module and optical fiber transceiver to transfer the displacement data to the on duty room computer. We compiled the data processing software to display the measure result in graphical and give a judge for the instable surrounding rock. If it is in danger, the alarm module gives audible and visible alarm signal in site and send a message to the manager’s mobile phone. The measurement accuracy is less than 1mm. We used this system to measure the tunnel surrounding rock deformation automatically and real time to realize intelligent management in several tunnel

Abstract: Explaining how to program in means of automation interface in Delphi and establishing the connection between OPC client and PLC through Profibus and Simatic Net so as to implement PLC data reading and writing.

Abstract: Because of the requirements of table grape logistics storage and transportation environment, a SO2 sensor node is designed based on the CC2530 chip to achieve the purpose of rapid and accurate transmission of the environmental concentration of SO2. And relevant tests were done to check the communication and monitoring performance of the node. The results can be good to meet the concentration of the environment SO2 and the design requirements.

Abstract: Aiming at the technological characteristics and production status of the mine hoist hydraulic brake safety protection system, the overall monitoring framework and monitoring scheme of the hoist brake system is proposed from the perspective of comprehensive protection and control: the high-performance data acquisition card and virtual instrument platform (Labview) are selected to carry out program development work on the system. System displays the monitoring data online and alarms some physical quantities, as well as stores and retrieves some important parameters and operational failures in order to achieve online monitoring security of braking system. So it provides technical support for the repair and maintenance of the mine hoist and scientific protection of the safety running of the hoist.

Abstract: Proposed a way to UPD flow and UPD system ideology. The system is considered the one-way characteristics of UDP flow in the backbone of the network, used the WinPcap packet capture technology. The system including network packet captures module, packet replay module, packets spell flow module, UDP analysis module, while using the map template classes in stl, improved the performance of UDP packets through a comparison function with efficient custom;Contrast to the data characteristics under the complex network environment, the system adopts the step-by-step small tools design way to facilitate the system to expand new analysis function. Through the three sets of data : a backbone data sets and two DARPA1999 data sets, it can be seen that the overall development of UDP data flow is expanding the network bandwidth , and small UDP flows is more.The quicker network bandwidth development, the shorter the UDP flows average time.

Abstract: A BIST structure for ADC test in Mixed-Signal SOC to characterize both the dynamic and static parameters was presented. A Sigma-Delta modulation based sinewave generator was built on the chip. The frequency, amplitude and phase of the sinusoidal signal can be adjusted through proper selecting generator parameters which are stored in ADC WBR. The response analyzer was built up from the memory and computational resource in the SOC.

Abstract: Excessive intake of formaldehyde gas is harmful to human health. Design of fast digital detection of formaldehyde gas is contained in this paper, which take use of sensor for rapid detection of formaldehyde in the air , a data conditioning and acquisition circuit of changing nano-amps current provided by the sensor into a suitable voltage after the MAX4072 and OP37 was designed and the voltage would be received by MSP430 at last. This formaldehyde digital detector can improve the detection accuracy; it also can determine whether the formaldehyde in the air exceed the body can bear in a short period of time.

Abstract: Through the amplification system to extract the brain electrical signal, although already can be displayed, but is not clear; in addition, the analog signal into the computer to carry on the analysis, also must pass to convert analog signals to digital signals (A/D converter).Therefore the need for further use of digital processing, this paper adopts the digital way, on brain electrical analog signal digital filter, through the 40Hz low-pass filter and 50Hz filter, get clear, stable signal, to achieve the design objective.