Applied Mechanics and Materials Vols. 479-480

Abstract: In this paper, we have designed and integrated an automatic optical inspection system, emphasizing on software implementation of the image processing, measurement and analysis utilities. As for the hardware equipments, we design an LED illumination unit and the custom-tailored machinery. By comparing the support functions of several main import brands of the optical inspection machine, we propose an optical inspecting procedure. By using the Windows-based user interface, we implement nine inspecting software tools, namely, the average gray level tool, the thresholding tool, the positioning tool, the edge detection tool, the binary large object (BLOB) tool, the template building tool, the smart matching tool, the inspection sequence tool, and the platform operation tool. All these tools can be used in an inspection with single operation and can also be arranged in a proper sequence of operations to fulfill a complicated inspection procedure. We use several part sample images with defects provided by the supplier to verify our fulfilled system.

Abstract: This paper represents a new interconnected architecture of Flight control System (FCS). It can solve the problems of massive equipment and large cross link information. The interconnected architecture adopts double CAN-Bus to construct a redundant flight control systematic bus. This paper will illustrate the characters of double CAN-Bus comparing with the characters of CAN-Bus firstly. Then it will present the bus controller hardware design, allowance design, network communication protocol, software flow and code design respectively. The experimental results show that the bus is running well, can satisfy the small vehicle control system of a high real time capability and node demand, at the same time system has high reliability, open etc.

Abstract: Wireless sensor networks have the advantages of low cost installation and flexibility, which make them an excellent mechanism for capturing environmental data and interacting with the physical environment for the application of building automation. However, radio propagation suffers from multi-path, shadowing and other radio interference problems in building environments. Therefore, deployment of sensor nodes in a dynamic in-building environment is a complex operation that requires expert knowledge and experience. In this paper, we present a deployment planning tool that can provide a set of useful tools for deploying a wireless sensor network in the building environment. The proposed deployment planning tool provides design tools that can assist users to develop a network infrastructure in order to support reliable communication. In addition, a network evaluation tool is provided to measure the index of network quality in order to ensure a reliable network quality. In order to evaluate the effectiveness of this tool, we designed a sensor network and simulated the network quality using this tool. The simulation results matched the experimental results of realistic deployment very well.

Abstract: The smart grid is a network of computers and power infrastructures that monitor and manage energy usage and uses intelligent transmission and distribution networks to deliver electricity for improving the electric system's reliability and efficiency. With grid controls, energy transmission management could be enhanced and resilience to control-system failures would be increased. Although deploying the smart grid has numerous social and technical benefits, several security concerns arise. In 2012, Xia and Wang proposed a secure key distribution for the smart grid. They claimed their protocol is strong enough to defend against security attacks. In this paper, we investigate the security of Xia and Wang's protocol. More precisely, we show that once the smart meter generates a session key with the service provider, the smart meter could easily forge the new legitimate session key without the service provider's participation. In order to remedy the security flaw, we propose a simple and secure improvement of Xia and Wang's protocol. Our protocol is secure and fair to generate the session key between the smart meter and the service provider.

Abstract: Home networking means high tech living environment which connect all the information electric appliances in the house with wire/wireless network and providing various services such as remote education, home automation and multimedia to anyone, anytime and anywhere free from boundaries. This thesis have designed and implemented a controlling system which control Embedded Home networking system with smart phone and server. Implemented Embedded home network system design proposed with embedded home node structure, remote smart application system, and home server controlling system. efficiency, safety of the power grid. Real time power measuring and its monitoring are necessary for safe energy supply, in this thesis, suggesting WEMS (Wireless electric power measurement monitoring system). Home node structure consists of intrusion detection, weather control, power control and On/Off control module and modules design proposed to be controlled from home server.

Abstract: This research creates home security service with social interaction based on a web-based multiple stations supervisory control framework. An Arduino controller is used as a thin-controller to control a home security system. Most control laws are computed in server-side, driving commands are transferred to local controllers for execution. A supervisory control server kept in a company can serve numerous Arduino controllers to provide home security service. The Arduino controller can sense door switch, motion detection, smoke detection, gas detection, CO detection, and an emergency button, and can drive door lock, two relays. Besides, RFID is used to help personnel in/out management and alert enable/disable. The controller reads inputs, uploads input/output data to the supervisory server, executes commands from the server, and drives output continuously. Once a controller is connected to the supervisory server, it can be monitored and controlled remotely. Condition control is proposed for the framework to help program control laws for Arduino controllers. In condition control, conditions are set. When some condition is met, certain actions are taken. There are three types of conditions; time condition, input/output condition, and location condition. And there are three kinds of actions; SMS notification, email notification, and output drive. Conditions, actions and their connections are set by system users in a browser with the help of the supervisory control information management system. The control laws set in the condition control are executed in server-side. User of the home security system can open the read/write rights of his input/output points to other users. With appropriate control law, a motion detection signal of one user can activate the alarm of another user. Therefore, the home security service is not just a security for users home, but a security for a social group.

Abstract: Hysteretic nonlinear characteristics of giant magnetostrictive sensor were studied in this paper. Nonlinear difference items were introduced to interpret the hysteresis phenomena of the strain-magnetic field intensity (MFI) curves of giant magnetostrictive material (GMM). The coupling relationship between strain and frequency was obtained in partial least-square regression method to describe the driftage phenomena of the strain-MFI curves of GMM in different frequencies. The mechanical model of giant magnetostrictive sensor was developed, and the nonlinear relationship between output voltage of giant magnetostrictive sensor and input excitation force was obtained. The nonlinear characteristics of giant magnetostrictive sensor were discussed, and the phenomena of accuracy aggravation in high frequency and delay of giant magnetostrictive sensor were explained. The new giant magnetostrictive sensor model has simple form and is easy to be analyzed in theory, which is helpful to measuring and control.

Abstract: A cyborg-type (or exoskeleton-type) robot suit is a wearable device that combines the human intelligence and the machine power so that it could enhance the intelligence of the machine and the power of the human operator. It could be worn over the arms and legs and assists body movement through electric motors attached to shoulders, elbows, knees, and the waist. It could be used in medical rehabilitation or to help people who suffered a stroke or spinal cord injury. It also could be used for people doing physically demanding work in factories or at disaster sites, even entertainment. This paper describes the basic technologies and concepts of wearable robot suits. It is followed by an overview of safety concerns and appropriate method to prevent the faults.

Abstract: This paper presents a calibration procedure for a Kinect RGB-D sensor and its application to robot simultaneous localization and mapping(SLAM). The calibration procedure consists of two stages: in the first stage, the RGB image is aligned with the depth image by using the bilinear interpolation. The distorted RGB image is further corrected in the second stage. The calibrated RGB-D sensor is used as the sensing device for robot navigation in unknown environment. In SLAM tasks, the speeded-up robust features (SURF) are detected from the RGB image and used as landmarks in the environment map. The depth image could provide the stereo information of each landmark. Meanwhile, the robot estimates its own state and landmark locations by mean of the Extended Kalman filter (EKF). The EKF SLAM has been carried out in the paper and the experimental results showed that the Kinect sensors could provide the mobile robot reliable measurement information when navigating in unknown environment.

Abstract: In this article, a small-displacement sensing system based on the surface plasmon resonance technology in heterodyne interferometry is proposed and evaluated. The basic sensing unit is composed of a prism assembly and a displacement probe. The prism assembly consists of a halfwave (λ/2) plate, two right-angle prisms and two rotation stages. The small-displacement sensor is with high sensitivity and resolution due to the attenuated total reflection effect in heterodyne interferometry. Besides, we can obtain the results of the experiment in a distant place by uses of the USB data acquisition card (DAQ card) and a ZigBee module. It can be found that the displacement resolution of the small-displacement sensor can reach 0.155nm by numerical simulation. The small-displacement sensor has some merits, e.g., easy operation, high measurement accuracy, high resolution and rapid measurement, etc.