Advanced Materials Research Vols. 989-994

Abstract: This study develops a low dropout regulator linear regulator, characterized by a high power supply rejection ratio using ultra-low output resistance buffer and two-stage error amplifiers. The high power supply rejection is based on a closed-loop LDO regulator. The ultra-low output resistance buffer achieves ultra-low output impedance with dual shunt feedback loops, subsequently improving load and line regulations, as well as the transient response for low voltage applications. The proposed LDO regulator linear regulator functions under an input voltage of 1.8~3V, and the output voltage can be maintained at around 1.27V. Moreover, its output voltage is independent of input voltage. The proposed regulator is applicable to light-emitting diode driver integrated circuits. The layout chip area of the LDO linear regulator is 21.5μm × 42.6μm.

Abstract: A numerical control transformation (NCT) system for a conventional lathe machine is introduced in this paper. The NCT system is considered as the key equipment to the manufacture of the transmission shaft. According to the construction feature and technological requirements, both the hardware and software construction are analyzed, as well as the implementation method of the NCT system. By practical operation, the experiment test result is given at the end of the paper to support the usefulness and practicality of the NCT system.

Abstract: An analysis method based on Teager-Huang transform for rotor local rubbing fault diagnosis is introduced. Firstly, the original vibration signal is decomposed into some Intrinsic Mode Function (IMF) components by using Empirical Mode Decomposition (EMD) approach, secondly, Teager energy operator is applied to estimate the instantaneous amplitude and instantaneous frequency of each IMF component, so the time-frequency distribution of the signal is obtained. The rotor local rubbing fault is simulated on a rotor test rig. The analysis results show that this method compared with Hilbert-Huang transform (HHT) can track the occurrence of rotor local rubbing fault better and can extract the characteristics of rotor local rubbing fault effectively. It provides a reliable method for timely and accurate diagnostic to the rotor local rubbing fault.

Abstract: A multiple-grain cutting model is developed to simulate the grinding process for rolled homogeneous armor steel (RHA) 4043 using a coupled three-dimensional (3-D) finite element (FE) - smoothed-particle hydrodynamics (SPH) approach in the research. The proposed numerical model is then employed to investigate interactions and interferences among the grains at high speed cutting. The numerical results show the cutting forces and pile-ups of chips are greatly influenced by these interactions and interferences during the cutting process.

Abstract: To realize starting operation and reduce position estimation error of switched reluctance motor (SRM) without position sensor, a novel control method based on pulse injection, divided angle section and variable threshold is presented. The starting operation of SRM can be accomplished by injecting high frequency pulse and judging position sectors. Variable threshold is used to reduce position estimation error. The value of threshold is obtained by looking up table prestored in controller. The method avoids complicated mathematical model and is suitable for starting operation with two phases. Besides, rotor position estimation error of this method is analyzed and the method which can decreased the error is proposed. At last, the experiment has been done to verify the performance of the control method.

Abstract: 0940 type cushion of E-flute corrugated paperboard is selected as the research object. By changing the load area, side breadth and the height of the cushions separately, static compression tests were done. The effects of structural parameter to cushioning property were analyzed through energy absorption method. It is useful to promote the application of corrugated board cushion.

Abstract: Biscuit, as a common snack, in order to attract the children’s attention, besides its taste and shape, packaging design is equally important. The beautifully decorated surface of the box can be divided into a number of blocks (4 or 9) by setting the punch lines. After the biscuits are eaten up, tear the box along the punch lines, then it becomes a simple jigsaw puzzle. Inside the box except the biscuits bag, a cute clamp like scissors added. So the children can gripping biscuits by the clamp rather than by hand directly.

Abstract: For a coordinate measurement system based on binocular vision, system calibration is an important factor for measurement accuracy. In this paper we present a flexible calibration method for the axis calibration of rotation stage which is installed in front of the binocular vision system to increase the system measurement range. By putting a standard ball in front of the binocular vision system, a sequence of pictures is taken by the two cameras with a few different rotation angles of the rotation stage. With the method of space intersection of two straight lines, the reference points (the ball centers at each rotation angles) for axis calibration are figured out. The trail of standard ball is a circle. Since all ball centers of rotation are on a plane perpendicular to the axis, the center of circle is on the axis of rotation stage. The rotation axis of stage is then calibrated according to the calibration model.

Abstract: In order to reduce consumption of thermal flow meter and prolong its working life, this article makes a research on cantilever switch, which control the circuit and save its energy. A cantilever was added into flow meter and was put into the air flow aisle in front of sensors. Process was designed and nanoimprint method was used to realize cantilever. The device was simulated and the effect on reducing consumption was certified, which has great significance on thermal flow meter.

Abstract: For marine seismic data acquisition needs,a multichannel marine seismic data acquisition unit was designed,which used the 32-bit analog-to-digital ADS1282 as a core and Field programmable gate array (FPGA) as the acquisition controller.The unit can achieve multichannel seismic data sampling and transmission functions.The design fully used with the design ADS1282 chip integration,with the corresponding anti-jamming measures,not only simplified the circuit design,but also ensured the quality of signal acquisition and system stability.the design used FPGA to realize a multichannel hydrophone signal synchronization sampling.