Abstract: In order to detect the rolling、pitch and yaw angle of high-speed-spin vehicle, a novel attitude sensor system is designed by using a digital signal processor TMS320F2812. The configuration of the sensor consists of two MEMS sensing elements and signal processing circuit and micro-processor. A new silicon MEMS gyroscope based on the Coriolis effect can sense three angular rate of spin vehicle, which can provide a synthesis signal, including roll, yaw and pitch angular rate. And a MEMS accelerometer reacts on demodulating the three angular rates. The design of the hardware circuit, the algorithm and implement of software are presented. The demodulation algorithm is validated by simulation experiment on the ground and the experimental results are presented.
Abstract: With the micromachining technology, two perpendicular cavities are formed on a silicon substrate, and two thermistors whose resistances are equal are placed parallel in each cavity. The nature convention of the gas is produced by the thermistors which are used as both the heater and the sensitive element in the hermetic cavity, and the acceleration can be measured with the temperature difference sensed by the thermistors. At last the test about the sensor shows when the value of acceleration is at the range of ±7g, the non-linearity is less than 0.62%FS.
Abstract: We report a silicon micro-machined gyroscope without the driven conformation. The output signal of the gyroscope contains the rolling, yawing, and pitching angular rates information. The principle of signal generation of the gyroscope is described with the equation, and the demodulation method of the gyroscope signals is illustrated by the experimental evidences. Toward the end, the key performances of the gyroscope are also presented.
Abstract: The structure and principle of silicon micro-machined gyroscope used for rotating carrier is introduced. The dynamic equations of axially moving are derived by analyzing three-axis moving of MEMS three-axis simulator. The result of simulation shows three moving locus of the head of rolling airframe missile, and three output signals from silicon micro-machined gyroscope which fix on inner plate of three-axis simulator, some rules of three output signals of three moving locus are gained. The signal of the gyroscope couples the frequency of the rotating carrier which makes the coning motion, so the frequency of the coning motion is contained when detecting the frequency of the rotating carrier using the signal of the gyroscope. By analyzing the output signals using Fast Fourier Transform (FFT) algorithm, subtracting the frequency of the rotating carrier, and the relative error is only 1.25% by detecting the self-rotating frequency of the rotating carrier.
Abstract: Supply Chain Management (SCM) in today’s global environment, especially the E-commerce is crutial to create significant competition advantages to corporations. Since the objectives and purposes are essential factors in the study of SCM inE-commerce. The purpose of this paper is to deliver the research question, review the conceptual framework, ERP and environment for SCMS, point out their objectives, impact of SCM and utilize theories that help identifying the important factors of the SCM. The differences of Pre-Internet and E-commerce are listed to clarify the further research.
Abstract: Traditionally, Models of IT manufacturing process planning and scheduling were carried out in a sequential way, where scheduling was done after process plans had been delivered. Since the two functions are usually complementary, it is necessary to integrate them correctly so that performance of an IT manufacturing system can be improved efficiently. In the thesis, a new integration model focused on key factors has been developed to facilitate the integration and optimization. The practice of the models show that the proposed approaches are promising and very effective methods for the integration of process planning and scheduling in IT manufacturing processes.
Abstract: A silicon micro-machined gyroscope without the driven conformation is introduced. The
structure of the silicon micro-machined gyroscope are researched and designed to withstand
vibration and shock at the request of the rotation carrier. The different methods including changing
the epoxy resin and sealing shell with laser are carried out and proofed by experiment verification.
Abstract: Green manufacturing (GM) is a sustainable manufacturing mode which comprehensive considers the environmental impact and resource consumption. Based on the analysis of state-of-the-art of digital technologies application in GM, this paper provides a green manufacturing-oriented digital system framework from the integration point of GM and digital manufacturing. The green manufacturing-oriented digital system framework is consists of five components which include the basic database for green manufacturing, software supporting layer for green manufacturing oriented digital system, digital system layer for green manufacturing, enterprise integration framework and product lifecycle based operation process layer. Furthermore, some key operation technologies for green manufacturing-oriented digital system is studied, which include product lifecycle based green design technology, and semantic framework model based information integration technology. Finally, the system is applied in an automobile manufacturing enterprise and achieves well application effects.