Applied Mechanics and Materials Vols. 241-244

Abstract: rigid limit equilibrium method and numerical simulation of FLAC software based on strength reduction method was used in this paper, and the stability of a highway slope before and after the reinforcement by prestressed anchor cable was analyzed. The calculation results showed that, the stability of designed excavated slope could not meet the requirements, while the stability of reinforced sloped by prestressed anchor cable could. The sliding surface of the slope and the corresponding stability factor could be obtained in two ways, but the numerical simulation of FLAC software considered the material deformation, so the calculation results was smaller than the results of rigid limit equilibrium method.

Abstract: It was analyzed for the four feedback control modes of knowledge fermentation containing non-feedback, negative feedback, partial feedback and adaptive feedback during the product innovation and design process. It was puts forward that rapid prototyping in the knowledge fermentation feedback control can quickly and efficiently promote knowledge digestion, knowledge conversion, knowledge growth and knowledge spread and product innovation can be accelerated. The case study of sprayer product innovative design and development has illustrated that, it is the most effective product development mode to employ knowledge fermentation adaptive feedback control based on the rapid prototyping which can provide rapid prototyping mold to be catalytic effect. Rapid prototyping can get the error value between outputting knowledge and target knowledge accurately and directly and offer feedback of knowledge fermentation timely. Accordingly it furthers the fermentation knowledge to the target knowledge, and ultimately finishes product innovation.

Abstract: Focusing on three kinds of 3D modeling technologies, AUTOCAD, ANSYS and FLAC3D, and their respective characteristics, and using effective interfaces of them, the paper introduced a modeling method of visual model, grid model and mechanical computation model for material design, and selectd a corresponding example using the method to make computation. Trial computation results showed the material model’s stress response under applied load: the maximum stress produced in the material model was 1.27e7Pa; the minimum stress was 1.02e7Pa; the maximum velocity response produced in the material model was 9.997e-6m/s; the material suffered no yield failure.

Abstract: In order to meet the requirement of magnificent appearance and humanization of the elevator car's decoration, this paper designs a elevator car's display system based on the STC11L60XE. This system is consisted of control module, display module, DS1302 clock module and SJA1000 transceiver module. The control module collects data from the DS1302, uses SJA1000 to receive and analyse data from the elevator motherboard, then drives LCD controller to display information of time and elevator running state. The actual tests in elevator shows that the system has a normal and stable display and can achieve reservation functions.

Abstract: Measurement results of spectral reflectance spatial distribution on multi-crystalline silicon solar cells surface are presented. The optical measurement apparatus employs a specific designed micro-spectral reflectance meter. It is suitable for working in visible wavelength range; measurable sample size can be as small as 0.06mm. Results of reflectance distribution on mc-Si solar cell are presented as a spatial sampling interval of 0.1 mm. The peak values of spectral reflectance appear about 400nm wavelength and vary from 10% to 30% with the spatial position on solar cell.

Abstract: This paper presents the implementation of CMTS (Cable Modem Termination System) with PON (Passive Optical Network) technology to transfer IP data in HFC (Hybrid Fiber-Coax) network. By describing the theoretical basis and main function of each module, we introduce work principle of this device: converted the format of data transmitting in HFC network so that it can transfer in IP network, then achieved the aggregation of IP data to transport layer device by PON technology. The results show that the SNR is high and the bandwidth achieves expected value, so this design scheme is feasible.

Abstract: The performance of optical wireless communication (OWC) links based on the spectral amplitude encoding (SAE) of a broad-band spatially partially coherent beam through atmospheric turbulence is analyzed. It has been found that the power efficiency of transmitters of OWC links based on the non-uniform SAE is higher than that based on the uniform SAE. Further, the spectrum division method for the non-uniform SAE of broad-band beams has been proposed. The non-uniform SAE of a broad-band spatially partially coherent beam is an effective method to reduce the performance degradation of OWC links caused by atmospheric turbulence.

Abstract: Laser radar is a kind of active modern optical equipment, It’s the extension of traditional radio or microwave radar to optical frequency. Because the probe beam wavelength shortening and directional strengthen, so that the laser radar has very strong space, time resolution and high detection sensitivity and other advantages, Laser radar has been widely applied in the atmosphere, ocean, land and in other target detection. Optoelectronic isolator is usually used in electronic circuit device, but the ns order of magnitude of the high-speed triggering and synchronization is more difficult, while the synchronization of laser radar and laser communication is in the order of ns. In order to solve this problem, this paper presents a high speed optical trigger, which can realize the high speed synchronization of emission laser and receiving circuit in laser radar, and delay time is within 150ns, that can provide protection to obtain synchronous valid data.

Abstract: To improve the current non-linear optically coupled isolation amplifier and high power consumption, we designed a low-power, high-speed and high-linearity BiCMOS optically isolation amplifier. There are only two push-pull output stages configuration bipolar transistor (BJT) in the design process, the rest of the circuit is the CMOS device. To improve amplifier gain linearity and stability, we introduce the complementary symmetrical photodiode, in the optically coupled part and every amplifier, negative feedback is introduced. Experimental results indicate that the design of optically isolation amplifier ± 3 dB bandwidth increases 40 kHz than optically isolation amplifier ISO100 bipolar, When the power supply voltage is 4.8 V, the delay - power product of DP is lower than ISO100 37.3 pJ, gain linearity is up to 5.5 × 10-5, which is suitable for high-speed control system.

Abstract: A complete analysis of flat and stable optical comb generation based on the re-circulating frequency shifter has been analyzed and demonstrated in this paper. We find out the influence to the flatness of optical comb owing to amplifier relative intensity noise and modulator relative factors imperfect, such as input RF signals amplitude and phase deviation and modulator defect owing to manufacture for the first time. Moreover, to verify the theoretical analysis, a 16 comb lines and spacing 12.5 GHz RFS generation system have also been carried out, and the results are in good agreement with the theoretical analysis results.