Applied Mechanics and Materials Vols. 738-739

Abstract: Based on the principle of machine vision technology, we designed a methodto detect the outline dimensions of automotive airbag quickly and accurately. We Used CCD camera obtain the airbag image, through the image processing method ofsmooth filtering andgray-scale transformationto complete pre-processing, finally applied Canny edge detection operator to extract the boundary of the airbag contour features,and then took the template matching methodto detect assemble error of the airbag image whether meet the requirement.The results show that the detection method have a higher precision, and the time is very short, it can improve the sampled positioningerror detection for the all checks image recognition detection, suitable for application in real-time online detection of airbag assembly line.

Abstract: This paper investigates the quantization methods of the reliability-based iterative decoding algorithm for LDPC codes. For the uniform quantization, we present a new design criterion to determine the quantization parameters with the clipping interval/probability. Compared to the original parameters setting, the presented design criterion can achieve higher resolution with the allowable quantization distortions. The presented parameter design criterion can be extended to the non-uniform quantization with a slight modification. Simulation results show that, the decoding algorithm can achieve better BER performances and faster convergence rate with smaller quantization bit when compared to the original parameters setting.

Abstract: In view of the traditional measurement system is not easy to install and design shortcomings, such as volume and requires a lot of wiring, This system used STM32 microprocessor and CC2530 ZigBee wireless technology to achieve the acquisition of High-speed rotating strain, high-speed storage, wireless monitoring system. This system can be used to replace manual operation, make the test more intelligent, more convenient and more accurate. This article used the STM32F103 chips as the main control system chip, implement the collection and storage function, CC2530 ZigBee protocol implemented wireless transmission function. Acquisition module used the high-speed AD transform chip ADS1274, Four-way synchronization acquisition, which convert digital signal transmit to the main control chip, the main control chip collected data which stored in the high capacity SD card. When need data, the system get the data from the SD card by zigbee wireless transmission to the monitor software. This system used the hardware filter and software filter, join the manning window, which reduced the influence of noise and improved the system accuracy. This paper had solved the monitoring question of the high-speed acquisition structure, implemented the function which data collection, storage and remote control for the integration, according to testing, the various technical indexes reach the system requirements^[1].

Abstract: A flexible and adaptable multi-target rule for ballistic target detecting and extracting based on the time frequency diagram and the synthesized range profile (SRP) is proposed and demonstrated. This rule can effectively avoid the overfull dependence on the motion model, and it is both appropriate for ideal and sliding scattering model. Meanwhile, it behaves well in noise restraint. Computer simulation verifies the adaptability of this rule.

Abstract: Based on the principle of the attenuation of an acoustic wave propagating in a gas-liquid two-phase flow, an experiment has been designed to measure the void fraction. The experiment system is consisted of three segments which arepressure stabilizing control system, ultrasonic measurement system and bubble injection system. The measurement process is three steps. First, a reference experiment is performed to acquire the received signal amplitude in pure liquid. Then, measurement of the received signal amplitude in different void fraction is accomplished. Last, the relationship between void fraction and signal amplitude attenuation is given on which the void fraction of two-phase flow can be detected. It is confirmed that void fraction detection using the present method achieves successfully.

Abstract: To meet the management requirement of potted flowers, a maneuverable and low-cost wireless monitoring system on the potted flower is designed in this paper. The system includes measuring module, data read and control module, remote wireless communication module and cloud storage module. The Arduino UNO platform is the core control module for this system, and the WiShield module is used as the wireless communication module. And, YL-69, GY-30 and SHT1x sensors constitute the data acquisition module. This system realized the acquisition of the air temperature and humidity, soil humidity and illumination, which were transmitted to the Yeelink platform to be saved or be used for online monitoring by the wireless communication module. This system is easy to be deployed, and has the features of low costs and good scalability.

Abstract: This paper describes the design and implementation of the on-line monitoring software system of partial discharge in GIS based on the combination of acoustic and electric in detail. The field operation experience show the system is stable and reliable which can meet the need of GIS on-line monitoring.

Abstract: With the improvement of people's security requirements,increasing the number of surveillance cameras,video surveillance by human beings is no longer suitable. Hence,intelligent visual surveillance technology emerges and becomes one of the hottest research points. In this paper,the processing of intelligent video surveillance based on human motion was divided into four categories: target detection,target tracking,object classification and recognition,and behavior analysis. Also made a detailed comprehensive review for situation of these parts,and made comprehensively summarized for the problems and difficulties which have to be resolved.

Abstract: In the ground test of inertial navigation algorithm, it is a typical method to use a turntable with high speed and precision to rebuild the air angular motion. As to the difficulty of building a big overload environment in which to get more real output of accelerometers, the method of using current injection to control its output is put forward in this article. Correlation models are established to control the current source card. At the end of the article, there is a brief analysis about real-time performance and precision of current injection.

Abstract: With the advantages of small size, cost efficient, low noise, energy saving, fine definition and high current, UAV has been widely used in various fields such as military, agriculture, forestry,meteorology, environment, etc. Moreover, this technique can obtain large area, large angle and 3D surface information without shadows resulting from cloud cover which is the common shortage insatellite images, it is also widespread in geological hazards monitoring. In this article, the applications of hazards monitoring using UAV has been reviewed at first, then according to the needof landslide monitoring, based on UAV data processing in geological hazard in east-north of Chongqing on 31th August, 2014, route planning method for lightweight and low altitude UAV inmountainous district is introduced, also the workflow and relevant experiences of UAV data processing by applying Agisoft photoscan software. After data processing, both geo-referencedDSM and DOM of landslide are obtained by interpolation with assistance of chosen GPS control points. The interpolated topographic map of landslide can provide important information forgeological hazards monitoring and emergency relief.