Applied Mechanics and Materials Vols. 130-134

Abstract: This paper was developed by microwave measurement on the vegetation dielectric constant through using the rectangular-waveguide at C Band. The measurement system and the method of the measurement will be introduced in detail. We have a standard block of known dielectric constant measurement, and then evaluate the error range. The system of measurement error range is ± 5%.At last, the result of this experiment showed that different density corresponds to different dielectric constant in the case of certain moisture content, and the dielectric constant increases with the density.

Abstract: A novel pulse power supply charge and discharge automation control program is proposed. The program is based on optical encoder communication mode power supply switch trigger technology. According to the requirements of control system and through the analysis of high power charge and discharge characteristics of pulse power, the whole design for the control system (multiple channels) is completed.

Abstract: This paper describes the design of weak signal conditioning circuit. The amplitude of weak signal is very small and can easily be submerged by the noise, so when we choose the component for the circuit, in order to diminish the noise of the conditioning circuit, we choose a kind of low-noise operational amplifier for conditioning the signal. This circuit is applicable to the slow-varying direct current signal, even when the amplitude of the signal is dozens of microvolt, it still can work as normal.

Abstract: Mobile robots are a very dynamic part of the robotic domain, self-localization is one of the basic functions of them, in the complex environment, and whether to achieve precise localization is the key factor for mobile robot navigates accurately. In this paper, on the basis of the mobile robot can identify the set artificial landmark correctly through its vision sensors, then, based on the observe landmark and perspective localization method, the mobile robot’s position and moving direction can be calculated in the world coordinate system. Finally, a lot of experiments are carried out, the experimental results show that in the structural environment, this mobile robot can realize self-localization under this method perfectly, and the localization accuracy and sampling frequency meet the need of practical requirement.

Abstract: In this paper, in accordance with several common signal interference in sleep EEG detection, it is processed by wavelet transform. It mainly includes: ①.remove white noise from EEG using wavelet threshold method; ②.remove baseline drift from EEG using wavelet decomposition and reconstruction method; ③.remove sharp pulse interference using wavelet modulus maximum algorithm; ④.remove EMG from EEG using wavelet decomposition and reconstruction as well as modulus maximum method. The results of simulation study show that: it can filter a variety of common interference in EEG detection preferably by wavelet transform.

Abstract: Since the internet has become a main method of image's transmission and storage, how to prevent illegal diffusion for some images deserves wide attention and discussion. This paper introduces an effective method of registering the decode program with the personal characteristic information. To guarantee the ownership and the integrity of the image data, with processed chaotic sequence or random sequences, the installation procedure produces distinctive registering numbers which indicate the users’ information.

Abstract: A continuous-wave lidar signal acquisition system with USB2.0 interface is present，in this paper. The hardware and the application program has been designed, its sampling rate is up to 1000Msps by flywheel A/D circuit. The signal correlation and accumulation is processed by using FPGA with512M RAM .The experimental results show that it can be used in a variety of systems.

Abstract: The most basic functions of wiper test system for modern high-grade cars are to provide accurate measurement of swing times of the wipers and real-time control of LIN wiper motor. In this paper, the design of a wiper test system composed of Hall sensor, LIN bus and MCU has been developed based on the research on Hall sensor and LIN bus. In the system, MCU is used to collect information of the swing counting sensors and controls the LIN motor. USB bus is chosen to interconnect the embedded system and the computer and counting sensors are responsible for wiper swing counting. Tests and actual operation showed that the wiper test system proposed in this paper is feasible, which offered automated wiper test and ensured quality of wipers. The system is of high practical application value.

Abstract: Based on the theory of HEV (Hybrid Electric Vehicle) and the idea of reverse simulation, the simulation model of the parallel HEV is established in MATLAB and the estimation of the energy efficiency, the power performance and the fuel economy of HEV is achieved, which provides reference for the performance estimation of parallel HEV. At the same time the definition and the estimating method about HEV energy efficiency were mentioned in this paper and the energy efficiency can be achieved by the simulation model. The results of the simulation show that this estimating method has certain practicability and convenience.

Abstract: Among researches on people evacuation under emergency, there are no deep touch of coordinating evacuation strategy of human and traffic, and also can not set models and simulate the whole process of evacuation. This research focused on the human evacuation under emergencies, divided the situations into Not Intervene and May Intervene, analyzed the coordination system and probed the model of coordinating evacuation. Based on the result of crowd simulation, the author could forecast the result of human evacuation and find the optimal traffic schedule proposal. The author took use of the improved Genetic Algorithm as well as the distributed coordinating simulation, finally found a systematic optimal scheduling program and revealed the internal regular pattern of coordinating evacuation.