Design of Test System for one Type of Airborne Photoelectric Equipment Based on PC104 Bus

2012 ◽  
Vol 241-244 ◽  
pp. 789-792
Author(s):  
Man Yi Hou ◽  
Hui Lin Fan ◽  
Xian Yong Jing
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Test System ◽  
Power Bus ◽  
Photoelectric Equipment ◽  
Embedded Computer ◽  
Develop Software ◽  
Multithreading Technology ◽  
Signal Conditioning Circuit

A certain type of airborne photoelectric equipment is the key device for aiming and distance measuring. On the basis of analyzing the test requirement of the equipment, a test system is designed with PC104 embedded computer as the core control system. The function of the test system is suggested. Hardware programs of power, bus board, signal conditioning circuit and anti-jamming measure are designed. The multithreading technology and measures to prevent wrong data communicating are applied to develop software of the test system. The test system can be applied to test and debug the photoelectric equipment. The data handling technology used in the test equipment has advantages as high speed, high efficiency and high reliability.

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

Research on Reconfigurable High-Speed Serial Bus Used in High-Reliability Embedded Computer

2010 ◽  
Vol 20-23 ◽  
pp. 774-778
Author(s):  
Rui Ding ◽  
Yong Qin Hu ◽  
Wei Gong Zhang ◽  
Bo Yang
Keyword(s):  
Computer System ◽  
High Speed ◽  
Communication Protocol ◽  
High Reliability ◽  
Dynamic Reconfiguration ◽  
System A ◽  
Embedded Computer ◽  
Key Points ◽  
Application Scope

The characteristics and limitations of the buses, which are widely used nowadays, are analyzed in this paper. Because these buses don’t adapt to the high-reliability embedded computer system, a novel bus is proposed which is characterized by its high-reliability. And its capacity is reached through its unique datum’s dynamic reconfiguration mechanism. The basic architecture and communication protocol are presented in this paper. And then the key points during realization of this bus are discussed. Finally, the probably application scope and prospects are indicated.

Improvement of Rotordynamic Performance of Integrally Geared Centrifugal Compressors Through a Systematic Design Modification Approach

2019 ◽  
Author(s):  
Zhusan Luo ◽  
Carl Schwarz
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Air Separation ◽  
Centrifugal Compressors ◽  
Design Modification ◽  
Design Variables ◽  
Short Period ◽  
Key Indicators ◽  
Bearing System

Abstract Integrally geared centrifugal compressors have found wide applications in air separation plants and the petrochemical industry because they can be readily designed to run at a higher efficiency than in-line compressors. Many of these compressors with multiple stages are designed to meet the demands for high power and high speed applications with high efficiency and high reliability. These requirements are challenges for their rotordynamic designs. Some compressors may experience excessive synchronous or subsynchronous vibrations during commissioning or in a short period of service. This study starts with discussing the vibration characteristics of a compressor pinion-bearing system, including undamped critical speeds, unbalance responses, and rotordynamic stability. To improve the rotordynamic performance, a systematic and feasible approach for modifying a rotordynamic design has been proposed. It has been showed that damped modes at an operating speed are key indicators of the rotordynamic performance. The sensitivities of damped modes to main design variables, i.e. bearing geometry, shaft geometry and impeller mass properties, are thoroughly examined. A procedure for design modification is proposed for general guidance. The feasibility and effectiveness of this method have been demonstrated in the modification of a pinion-bearing system. In addition, this paper also proposes a method to evaluate the torsional natural frequencies of an equivalent pinion model and briefly discusses the application of optimal design methodology to the rotordynamic design modification.

Design of Monitoring System for Frequency Converter Sets Based on PCI Bus

2011 ◽  
Vol 128-129 ◽  
pp. 1409-1412
Author(s):  
Xin Yu Yang ◽  
Pei Yuan Cheng ◽  
Xiao Quan Li
Keyword(s):  
Monitoring System ◽  
Virtual Instrument ◽  
High Speed ◽  
High Reliability ◽  
Frequency Converter ◽  
Test System ◽  
Pci Bus ◽  
Turbo Generator ◽  
The Status ◽  
Hardware Circuit

It is difficult to finish fully and professional testing about frequency converter sets when it was broken or repaired. Aimed at this problem, monitoring system for frequency converter sets is designed. Its hardware circuit is based on IPC platform and PCI bus and software platform is based on Visual Basic and VI (Virtual instrument) technology. It can finish controlling the work status and checking voltage, power etc. and temperature of key parts real-time about the set. Simultaneously it can give an alarm when the status is abnormal. Its results has characteristics of high reliability, high speed and intuitionistic. So it can improve efficiency of test system maximum and save repair expenditure. The system helps for improving reliability of gas turbo-generator set and power quality.

scholarly journals Monitoring of train-induced vibrations on rock slopes

2017 ◽  
Vol 13 (1) ◽  
pp. 155014771668755 ◽  
Author(s):  
Jiangbo Xu ◽  
Changgen Yan ◽  
Xu Zhao ◽  
Ke Du ◽  
Heng Li ◽  
...  
Keyword(s):  
Particle Velocity ◽  
High Speed ◽  
High Efficiency ◽  
Low Cost ◽  
Test System ◽  
Peak Particle Velocity ◽  
Vibration Test ◽  
Long Distance ◽  
Stability Of Slopes ◽  
The Stability

Train-induced vibrations will undoubtedly influence the stability of slopes near railway lines. To monitor the effects of such vibrations on slope stability, a wirelessly networked vibration test system was established, which included wirelessly networked vibration meters, high-precision and high-speed three-dimensional sensors and a remote wirelessly networked data server system. This system represents the first attempt to monitor the effects of train-induced vibrations on the stability of slopes in China. It enables real-time and long-distance monitoring by means of remote transmission with a low cost and high efficiency. The duration, frequency, amplitude, peak acceleration and peak particle velocity were adopted as measures for evaluating the influence of train vibrations. Simultaneously, we used additional monitoring technologies to verify the conclusions of the wirelessly networked vibration test system. The monitoring results indicated that the peak particle velocity was much higher near the track and gradually decreased with increasing distance. When the distance between the measurement point and the road axis was 12 m ( H = 0 m), the maximal peak particle velocity was 0.4 mm/s, which remained below the maximum safe value.

A Study on 400V Sized Trench Power Semiconductor for Smart Power ICs

2013 ◽  
Vol 712-715 ◽  
pp. 1771-1774
Author(s):  
Ey Goo Kang
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Low Noise ◽  
Noise Power ◽  
Smart Power ◽  
Large Power ◽  
Power Mosfet ◽  
Power Semiconductor ◽  
Fast Switching

Power MOSFET is develop in power savings, high efficiency, small size, high reliability, fast switching, low noise. Power MOSFET can be used high-speed switching transistors devices. Recently attention to the motor and the application of various technologies. Power MOSFET is devices the voltage-driven approach switching devices are design to handle on large power, power supplies, converters, motor controllers. In this paper, design the 400 V Planar type, and design the trench type for realization of low on-resistance. Trench Power MOSFET Vth : 3.25 V BV : 484 V Ron : 0.0395 Ohm has been optimized.

High-Performance and High-CRI OLEDs for Lighting and Their Fabrication Processes

2010 ◽  
Vol 75 ◽  
pp. 65-73 ◽  
Author(s):  
Takuya Komoda ◽  
Toshihiro Iwakuma ◽  
Minoru Yamamoto ◽  
Nobuto Oka ◽  
Yuzo Shigesato
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Thin Layers ◽  
Heat Radiation ◽  
High Luminance ◽  
Time Operation ◽  
Long Lifetime ◽  
White Oleds ◽  
Material Utilization

The improvement of the basic performance makes white OLEDs the promising candidate of the next generation, environmental friendly lighting source. However, for the practical application, additional properties of higher color rendering index (CRI), long lifetime at high luminance, large area uniform light emission, and high reliability for long time operation are required. Furthermore, innovative fabrication processes specialized for OLED lighting are required to reduce the cost by improving the material utilization and productivity. We developed various technologies for OLED lighting in the Japanese governmental project “High-efficiency lighting based on the organic light-emitting mechanism” from 2007. In this project, high CRI, highly efficient and long lifetime white OLEDs were realized by optically designed two-unit structure with a fluorescent deep blue emissive unit and a green / red phosphorescent unit. A reliable encapsulation structure with high heat radiation and moisture-proof characteristics realized a stable emission at high luminance as well as long storage stability. Additionally, thermal diffusivities of organic thin films with sub-hundred nanometer thicknesses were analyzed by a “rear heating/front detection type” nanosecond thermo-reflectance method. High speed wet coating process and vacuum deposition process for very thin layers were developed to improve the accuracy, material utilization and productivity.

scholarly journals A Built-in Self-Test System for External DRAM

2020 ◽  
pp. 80-87
Author(s):  
Gor Abgaryan
Keyword(s):  
Integrated Circuits ◽  
High Speed ◽  
High Efficiency ◽  
Random Access ◽  
Test System ◽  
Mass Storage ◽  
Access Memory ◽  
Yield And Quality ◽  
Self Test ◽  
Built In Self Test

In the fast-growing Integrated Circuits (IC) industry, memory is one of the few keys to have systems with improved and fast performance. Only one transistor and a capacitor are required for Dynamic Random-Access Memory (DRAM) bit. It is widely used for mass storage. Although the high-efficiency tests are performed to provide the reliability of the memories, maintaining acceptable yield and quality is still the most critical task. To perform a high-speed effective test of DRAM memories, a built-in self-test (BIST) mechanism is proposed.

Proposal of High-Quality Laser Hardening System for Shaft Parts Using Cylindrical Mirror and Ring-Beam Shaped by High-Speed Laser Scan System

2020 ◽  
Author(s):  
Hirotaka Tanabe ◽  
Keiji Ogawa ◽  
Heisaburo Nakagawa ◽  
Hirohito Tsukada ◽  
Yuki Goto
Keyword(s):  
Heat Treatment ◽  
Laser Beam ◽  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Low Cost ◽  
Treatment Method ◽  
Post Processing ◽  
High Quality ◽  
Almost All

Abstract Shaft parts are important parts used in almost all machines including automobiles. In addition, extremely high reliability is required since a shaft failure is directly linked to a fatal machine trouble. Therefore, a hardening process is usually conducted to improve strength and wear resistance. In this study, we propose a new laser heat treatment method to produce high-quality and high-accuracy shafts with high efficiency, low cost and low environmental impact. We will also develop a technique to derive the appropriate laser irradiation conditions quickly and systematically for shafts with various shapes and dimensions. There are the other hardening techniques including the electric furnace method and the induction method. These methods require post-processing for deformation correction, whereas the proposed method uses a laser to achieve thermal deformation-free hardening, eliminating the need for the post-processing. As a result, an improvement in yield can be expected due to a reduction of the products that cannot be corrected after heat treatment, which had to be waste disposed with conventional methods. By using our method, the entire circumference of the shaft was hardened by using a ring-shaped laser beam and a cylindrical inner mirror. Here, the ring-shaped laser beam was formed by high-speed scanning of a spot shapelaser. In the present paper, the details of this system were introduced and some experimental results were described.

Based on Fluid Digital Transmission and Control Theory on Application of Digital Hydraulic Valve

2012 ◽  
Vol 619 ◽  
pp. 455-458
Author(s):  
Wen Hua Li ◽  
Yu Ling Du
Keyword(s):  
Control Theory ◽  
Hydraulic System ◽  
High Speed ◽  
High Efficiency ◽  
Simulation Analysis ◽  
High Reliability ◽  
Electronic Control Unit ◽  
System Pressure ◽  
Analysis Experiment ◽  
Hydraulic Valve

A digital hydraulic valve is a new control theory and method, it is through the electronic control unit installed in a conventional valve, and integrated processing, the formation of a wide variety of digital valve，By the digital-to-analog conversion element is directly connected with the computer. Using the computer output pulse number and frequency to control electro hydraulic system pressure and measurement. The system proposed can make the hydraulic system has the advantages of high efficiency, high speed, high reliability. And used Matlab/Simulink software to control system performance simulation analysis, experiment and simulation results show that, this system has great application prospect and practical value.

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