共查询到20条相似文献，搜索用时 15 毫秒
1.
Industrial Personal Computer(IPC) system generally works in long duration,and so a stable software is essential for an IPC system.Linux has a good deal advantages,such as,stability in use,open source code and free of charge, therefore an IPC measurement and control system has developed based on Linux. Multi-task scheduling is the critical part in system software.A simple method to realize multi-task scheduling in IPC measurement and control system based on Linux alarm clock mechanism is presented. Linux alarm clock mechanism is implemented by the cooperation of software timers and system call that is used to install and handle alarm clock.First, Linux process timers,soft interrupt signals, relevant system call are introduced,as well as applications of Linux alarm clock mechanism in multi-task scheduling. And then an example of the application in the IPC measurement and control system is given. The system has passed longtime run test,accomplished expected functions and shown well stability, so that practicability of the scheduling method has been authenticated. 相似文献
2.
with the measurement and control network technology, the research and development of the performance test system of silicone oil fan clutch for automobile are introduced. The system can take intelligent measurement with three clutches on the line simultaneously. It also can display measurement curves, file reporting, and so on in the same time. The system has the capability of 256 channels communications. 相似文献
3.
This paper has discussed the characteristics of the development of automobile components test system.Based on the development example of vehicle hyraulic shock absorber test system,the paper has built general measurement & control software platform for automobile components tests,carved up main function modules along with the class libraries for platform,and adopts multi-thread technology to guarantee platform's real-time performance.The platform has enough flexible and extensible capability,and can satisfy the requirements of software developing for modern automobile components test system. 相似文献
4.
Tang Chaowei LiangXichang Shi Jinfa 《保鲜与加工》1993,(1):129-132
In high speed data collecting system , the way of data transmission is very important. This paper has analyzed in detail the necessity of DMA in data collecting of curve surface measurement and given out the circuit for DMA and described the theory and programming method. 相似文献
5.
The design of virtual instrument for automobile based on PC/104 has been presented by comparing with the traditional auto meter. The paper focuses on the development environment, system construction and operation principle. The data of the virtual instrument is transported by CAN bus, and this system can monitor in real-time, display in digit and fire the alarm to the super-speed, save the record. 相似文献
6.
A digital measurement apparatus is developed for Impulse high voltage. Ine ap paratus composes of a high speed A/D converter(20 MHz),a single-chip computer interface and some other high speed analog intergrated circuits with excellent function,It is characteristic of flxing transient waveforms,storing,processing and analysing waveform data measuring maxi-mum value of impulse high voltage. 相似文献
7.
Continuously variable transmission (CVT) is the ideal transmission for automobile, it is also one of the most important research items of researchers and automobile companies all over the world. In order to research vehicle with torque converter as starter and metal pushing belt as high speed transmission equipment(dual state CVT system), based on the test data of engine and torque converter, the integrated control strategy for vehicle with dual state CVT system is proposed and integrated control simulation for car with dual state CVT system is finished at the condition of multi mode. The research results provide the theory method of analysing and designing for CVT vehicle. 相似文献
8.
由于油菜收获期南方气候阴雨潮湿,对油菜籽进行及时干燥非常重要。掌握油菜籽烘干特性和最佳烘干工作参数对于研制新型高效节能油菜籽干燥设备具有重要意义。本文基于总重检测原理研制了一种实验装置,实现了烘干过程中的参数控制和数据实时采集。应用该设备对油菜籽烘干特性进行了研究,以介质温度、穿透风速以及缓苏时间作为烘干特性的主要影响因素,以提高降水速率和降低单位能耗为研究目标,进行了单因素和多因素试验。试验结果表明,基于总重检测的油菜籽烘干特性研究方法具有结果直观、测量准确、数据连续性好的优点。并得到了油菜籽烘干最佳工作参数为：介质温度75℃、穿透风速0.358m/s、缓苏时间30min。 相似文献
9.
According to the reality of the development of fire alarm system in our country, this paper offers a fire alarm information system based on Internet. Being different with the way of normal router in transmitting all data packages fairly, a new dispatch algorithm is put forward, which can identify different data packages of demanding different real-time performance and transmit the data packages of demanding high real-time performance by jumping queue intelligently. That decreases warning time delay and improves the dependability of important data transmitted by router. A new kind of method is proposed to satisfy a high real-time system at a low cost. 相似文献
10.
This paper has explained the characteristics,virtue of sound intensity measurement and the principle. And compare with traditional sound pressure measurement. The principle and composing of virtual sound intensity measurement system based on two-channel FFT analysis are researched. The sound power of large turbogeneratorin operating site is determined by means of sound intensity measurement and sound pressuremeasurement. Itis demonstrated that the method of sound intensity measurement of engine is practicable and the measuring data are valid and the method conquers the problems of traditional method of sound pressure measurement which is apt to environmentinfluence and sound power measurement need to especially acoustic environment. It is proved that the sound intensity method is especially suited to determine highaccuratelythe sound Power level of the electrical machines operating in situated conditions especially in case of acoustically worst environments or on loadand themethod is so superiorityin noise measurement. 相似文献
11.
The basic principle and the composition of optic fiber F- Pstrain measurement system are introduced, and it is practically utilized in the strain measurement of Dafoshi Yangtze River Bridge. The results show that, the acquired data from F- Pstrain measurement system can effectively describe the strain variation upon the temperature change, the measurement system is working sound and effectively. 相似文献
12.
A method of solving the problem of shoe leather lumen measurement in shoe CAD/CAM by industrial CT technology is introduced,X ray industrial CT technology is studied. The paper gives a rational scheme of system dispose. This scheme can be not only meet the need of shoe leather lumen measurement, but also achieve ordinary measurement. An uncomplicated and practicable movement control system are proposed also. This scheme achieves high precision of movement position without expensive direct current servo-control. A new simple method measurement is developed and accurate control of position in movement of detector data insert is achieved. The image resolving power can meet shoe leather lumen measurement. 相似文献
13.
Tang Chaowei Liang Xichang Shi Jinfa 《保鲜与加工》1993,(1):117-123
Based on the method of laser triangulating measurement, 3-D sensing system of reflecting mode with laser scanning is proposed. This measuring system has solved the problems of measuring humanbody' s curved surfaces and can provide data to sculpturing fashion designing and artificial limb making. 相似文献
14.
ZHANG Liang 《保鲜与加工》2002,(6):152-154
Illegal traffics on network can be actively detected by network security monitor An advanced system is given which can capture network data stream and intercept malicious attack, so as to alarm or take response action in real-time. The system is composed by sniffer, monitor control center, remote management unit,etc. Attack activities under surveillance can be distinguished by two methods,which are rule based method and statistics based method. Intrusion recognition by sniffer is the key technology of the system. In addition, dilemma between real-time data stream and high inquiry speed, as well as dynamic addition of attack rules contributes to the main concern of system design. Backdoor of The system can be self detected, while intelligent analysis and bi-directional surveillance ability has also been implemented. With all these advance features, the system is presented not only as a strong assistant to traditional network security products, but also an important tool for counter-fighting with rampant network intrusion nowadays. 相似文献
15.
There are some weaknesses for traditional microscope measurement, including small scope field, complex operation and subjective errors. To avoid these issues, a measurement system combining video and microscope is made. With the magnification of microscope and video, the accuracy of grating micrometer and the real-time notification of chamfer location, this system achieves high precise measurement. By displaying with two monitors, the computer can collect and display other measurement data while the chamfer is measured, which makes full use of the display resolution and enhances the efficiency of instruments. The method is valid for measuring size of special work-pieces. 相似文献
16.
This paper introduces a method of solving the problem of leather cavity measurement in shoe CAD/CAM by industrial CT technology. Concentrating on peculiarity and requirement of leather cavity measurement, this paper presents a X-ray industrial CT system scheme, which not only satisfy the requirement of leather cavity measurement but also can achieve general industrial CT. measurement. The achievement on data collection system and motion control of stepping motor is emphasized. 相似文献
17.
During the research on automobile prize and punishment system, a novel method is proposed in terms of grouping by the history to claim the record, the ages of drivers and the types of the vehicle. When the factors are considered, the related data can be classified by homogeneity of risks and applied to design the prize and punishment system. Experimental results show that a more reasonable and fair system is obtained by using the above method. 相似文献
18.
Radio administration department permits station's building and distributes frequency used by measurement in radio electromagnetic environment. In order to improve the efficiency and accuracy of testing, the automatic measuring system software based on virtual instrumentation technology(VISA and SCPI) has developed at the VB platform, which changes the phase of outputting data just by printing spectrum chart .The system realizes functions of data sampling, transffering and processing in HP E7405A EMC analyzer. It also can establish database files for saving, inquirring, data shareing, exchanging and processing. The spectrum chart of mearsurment result is the same as that of result by manual work. 相似文献
19.
The temperature drift is one of the most important error sources and influences the measuring accuracy of gyroscope greatly. The more exact temperature is measured, the more accurate angular error could be compensated. So the improvement of temperature measurement is significant to the system accuracy. A temperature measurement and compensation system was designed and experimented. The temperature of solid vibration gyroscope developed by ourselves was measured, analyzed and corrected. At last, the mean square deviation reduced from 31. 418 2 to 0.547 7, The experiment results proved that the design of soft and hardware is effective. 相似文献