Applied Mechanics and Materials Vols. 490-491

Abstract: The three kinds of the typical pile type are selected, which containing flexibility pile (e.g. rammed cement-soil pile is for short RCSP), rigid pile (e.g. cement-flyash-gravel pile is for short CFGP) and loose material pile (e.g. sand-gravel pile is for short SGP). The seven kinds of the composite foundation are designed, which are CFGP, CSP and GP composite foundation, CFG long pile and sand-gravel short pile (for short CFGLP-GSP), CFG long pile and CFG short pile (for short CFGLP-CFGSP), CFG long-short pile and rammed cement-soil short pile (for short CFGLP-RCSP) , and CFG core pile rammed cement-soil loop pile (for short CFGCP-RCSP) combined composite foundation. According to the load-settlement curves to determining the increment deformation modulus of the every load step, the layer-wise summation method to calculate the settlement of composite foundation is given, and the calculation results and the load-settlement curves are consistent.

Abstract: The paper presents basic geoelectric models given the seismoelectric effect for application in pro-cessing algorithms of the geodynamic information. They can improve the reliability of the estimation under the control of geodynamic processes and phenomena taking place in the surface layers of the geological environment. The models under the effect of longitudinal and transverse modes of seis-mic waves on a small particle of the environment are considered. A one-dimensional model of the environment under the joint effect of the longitudinal and transverse modes of seismic waves is pre-sented. The mathematical modeling of two media under the effect of longitudinal elastic defor-mation is given. The dependences of the relative change in the transfer coefficient for two media on the electrical parameters of contrast media both resistivity and dielectric constants are discussed. Based on the results of mathematical modeling, the application of seismoelectric effect in geody-namic control systems proves to be highly efficient.

Abstract: In the fuel injection pump on crude oil engine, the precise couple attrition will cause loss of oil supply pressure, oil consumption increase, under-power, emission pollution increase and other problems after the long-term usage. The traditional filed-strip is complicated and time-consuming. Through the summary of engine trouble regulation, we can find out fault diagnosis without disassemble has guiding significance for the modern vehicle maintenance and repair. This article realizes the test and application of fault diagnosis for diesel oil supply characteristic through testing oil supply pressure and oil supply diesel engine.

Abstract: For UAVs are favored by many countries, the reason is that they are not affected by man-induced factor. While the ducted fan UAV is a new type of UAV, rises in recent years, but it has become very hot in the field of the research and development of miniature unmanned aerial vehicle. This paper is based on the research of a kind of small ducted fan UAVs, and works on the system parameter identification of the UAV and the design of attitude controller.

Abstract: Intermittent Pneumatic Compression devices are widely used for various therapies concerning the cardio-circulatory or lymphatic system, and also for performance recovery in sports activity. The development and setup of such devices are mainly based on empirical procedures, while few researches adopt an engineering approach based on mathematical modeling and identification. In this approach, the most critical point is the definition of parameters concerning the human-machine interaction. This paper proposes an original and simple method to identify such parameters, which allows to describe in effective way the main dynamic characteristics, fundamental for a correct design and control of the device.

Abstract: To solve the problems of consumers security and privacy, an optimized RFID unidirectional authentication method is proposed, comparing with other asymmetric cryptography, this method has stronger security, shorter key length, less computation and so on. This method achieves one-way authentication between tag and reader-writer, and allow the labels to automatically update the key to improve the performance of RFID authentication, and also can enhance security through updating keys. This method allows the label to update its own name and private key, so can prevent attackers tracking them, so as to solve the privacy problem of the tags.

Abstract: The traditional AdaBoost based object detection algorithm can get perfect performance for visible images, but not for infrared images because of the worse description of Haar features. In this paper, a novel infrared object detection algorithm based on improved AdaBoost with powerful histogram features is proposed. Firstly, HOG histogram with fourth grid area of image gradient is used for the input of classifiers. And then, AdaBoost with weighted FLD as weak classifiers is employed to select the multi-dimension features. Finally, the infrared object detection is realized by multi-scale sliding windows and non-maxima suppression algorithm. The experimental results demonstrate the better performance of the improved AdaBoost detection algorithm which can detect multi-scale infrared targets accurately.

Abstract: Industrial firewall and intrusion detection system based on Modbus TCP protocol analysis and whitelist policy cannot effectively identify attacks on Modbus controller which exactly take advantage of the configured rules. An Industrial control systems simulation environment is established and a data preprocessing method for Modbus TCP traffic captured is designed to meet the need of anomaly detection module. Furthermore a Modbus function code sequence anomaly detection model based on SVM optimized by PSO method is designed. And the model can effectively identify abnormal Modbus TCP traffic, according to frequency of different short mode sequences in a Modbus code sequence.

Abstract: At present, our rapid development of a processing industry requires the increasing number of numerically-controlled machine tool. At the same time, people grow the attention of diagnosing the fault in order to repair the machine one time. This article starts the research of fault diagnosis based on fuzzy neural network. At first, it evaluates the structure and learning method of fuzzy neural network. In the second place, this paper analyzes the numerically-controlled machine tool in details, and summarizes the fault and reason. At last, this article makes the comprehensive research of neural network and fault diagnosis and provides part of the code. It has positive guiding significance to the worker of numerically-controlled machine tool.

Abstract: Availability analysis presents a means to understand the impact of existing maintenance system and maintenance resources to the overall system operational availability. The practical method for conducting availability analysis of a plant system at operation phase is illustrated and discussed via a case study of an acid gas removal system of gas processing plant. This study demonstrates that the availability modeling and simulation is effective in assessing the existing and future system configurations and determining possible impacts and critical factors to systems availability. These findings can significantly assist management to make right actions in improving plant system performances.