共查询到20条相似文献，搜索用时 15 毫秒
1.
Hilbert-Huang transform(HHT) is a new method for signal analysis developed by Norden.E.Huang et al in 1998.The concepts for main contents,Empirical mode decomposition,Hilbert spectrum and marginal spectrum of Hilbert-Huang transform(HHT) are introduced.Based on the characteristics of VI's development and application,combining software and hardware,the designed method,which includes hardware,software and panel for the Virtual Signal Analyzer Based on Hilbert-Huang Transform are introduced.Based on the HHT,combined with virtual instrument technology,a Virtual Signal Analyzer is developed successfully.It has provided a new method for signal test and analysis. 相似文献
2.
The flowmeter based virtual instrument is a new test instrument, which has more advantages than the traditional flowmeter. This flowmeter is based on Qin's model. Apply to the flowrate measurement realm the virtual instrument technique. The design method has been introduced from hardware, software and panel, modelize the different flowrate measure way, with the virtual instrument's figural calculation and show to replace the traditional flowrate measurement, realize multi-threading long-distance flowrate measure easily. 相似文献
3.
Traditional noise octave analyzers consist of filter network and weight network based on hardware. In order to realize a noise octave analysis by software, a digit weight method based on FFT is proposed. Using the method, digit weight and digit system error modification for virtual noise octave analyzer can be realized. Because of digit weight and digit system error modification, precision and stability of the instrument can be improved greatly. As an application, which combines the method of digit weight with the technique of digit system error modification, a low cost and high precision virtual real time noise octave analyzer is developed. 相似文献
4.
This paper discusses the structure, design and key techniques of testing system, and expounds the design and development of hardware and software based on virtual instrument technology. The design of hardware includes signal conditioning module and data acquisition module. The design of software includes interface program and upper layer program. Combining the hardware and software effectively, a testing system for ABS test-bed is set up, which has multifunctions of developing, debugging, inspecting and performance valuing to ABS. Having crucial meaning in engineering, the development of this testing system will make ABS tested in the lab mainly, thus improve the security and make the test more economical. 相似文献
5.
In recent years,Virtual Instrument technology has been concerned in the arena of information technology and instrument manufacture.The authors propose the Virtual Instrument's concept,characteristics and configuration of both hardware and software.They apply Virtual Instrument to the humidity testing and brings forward the method to solute the problem,which traditional dry-humid balls humidity-testing instrument can not test several objects.By putting the emphasis on data acquisition,data processing,data storage and data display,the software design of virtual humidity test is discussed. 相似文献
6.
The limited Value of specific A-weighted sound level in the present standard JB/TQh341-84 promulgated by the Ministry,which is applied to determine the unaccuracy of noise characteristics for axial-flow ven tilators has been discussed,Simultaneously a measure that should badopted to reduce the noise of high-pressure&great-flow axial flow ven tilators and a limited standard value for A-weighted Sound level have been also presented,This can not only keep the noise of ventilators up to A-weighted sound level.but also can decrcase the noise of ventilators properly. Purthermore this can make the noise standard for axlal flow ventilators be more scientific and more practica ble. 相似文献
7.
This paper expatiates on the bus structure and develop the bus mode Multi-Channel Analyzer (MCA). The nucleus of this MCA is the PC/104 embedded computer, and it introduces the bus communication to realize system and data communication. It may realize data collecting and showing in the field, because the bus mode is rapid. At first, on the hardware we introduce CMOS components, this reduces power, volume and weight. These make it adapts to use in the field; besides, on the software we adopt C and assembly language to program in order to improve conversion speed. At the same time, single-task DOS operating system is infroduced, which makes the software run more steadily, operate more simply. By means of testing on the spot it can normally work, so it suitable to work in the field. 相似文献
8.
基于LabVIEW的潜油电泵数据采集系统 总被引：1，自引：0，他引：1
应用LabVIEW虚拟仪器现场可编程门阵列(FPGA)对潜油电泵的电压、电流参量进行实时数据采集,通过上位机对采样数据进行分析处理,得到潜油电泵的视在功率、有功功率、无功功率和功率因数,并与电能质量检测仪检测数据进行对照。系统硬件采用NI sbRIO-9606和NI9683夹层板配合使用,突破了传统的依靠DAQ助手的硬件采集,基于现场可编程门阵列(FPGA)的数据采集系统,由软件构成采集功能芯片,可控性强,准确性高,应用性好。实验表明,该系统在误差允许范围内能够对数据进行准确采集。 相似文献
9.
Sweeper is a machine, which can clean up rubbish on the road surface with functions like drizzling, sweeping and sucking rubbish. Aiming at control of sweeper, the author introduced analyses on the theory of software and hardware of the system and their design using single chip computer (8752BH) as the core of control system. At the same time, the authors expatiated some anti-jamming measures, discussed the measures from the points of restraining electromagnetic noise, hardware and software anti-jamming to enhance the reliability of the control system. 相似文献
10.
The Data Logger is an important secondary-instrument,which can be applied to automatic monitor and control system,and high speed local data acquisition for later analysis.The Virtual Great Capacity of Data Logger based on virtual instrument technology is a new instrument which has more advantages than the traditional Data Logger.The design method has been introduced from three ways,which includes system principle, hardware configuration and programming design, and an application example is given.This Data Logger is low cost,easy to take,also easy to operate.It can be widely used in many of actual applications. 相似文献
11.
Virtual Instrument has become an important direction of instrument development, now it has been widely used in many fields. FFT analysis is a widely used method in mechanical engineering, fault detection and many other fields. However, the traditional FFT analyzer is expensive and is not easy to upgraded. The birth of virtual FFT Spectrum Analyzer gets rid of the limit of traditional FFT analyzer, and paves the way for the application of FFT analyzer. The uses of DSP technology make the future broadened of Virtual Instrument. This article ,based on the deep study of DSP system, designs a virtual FFT Spectrum analyzer based on DSP technology. The design is new and of great practicality, which indicates the important role of Virtual Instrument in the development of instruments. 相似文献
12.
GU Xing-zhi ZOU Jian PAN Ying-junte Ministry of Education Chongqing University Chongqing Chin 《保鲜与加工》2004,(2):36-39
This paper states the application of a microcontroller (P80C552) that has ADC internally using on the Microwave Remedial Instrument, briefly introduces the composing principle and function of the instrument, and further describes in detail the design of the system's software and hardware. At the same time, the paper describes some components of the Microwave Remedial Instrument, and the basic and the new functions of the microcontroller (P80C552). The intelligent automatic control system makes the instrument more stable and reliable via controlling the Microwave Remedial Instrument intelligently. The testing result shows that this design is realizable. 相似文献
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14.
In the group decision supporting system, no matter how excellent the individual decision terminal is, it's difficult to ensure the correction of the final decision without a efficient and reliable GDSS coordinated system.Since the voting instrument is the key part of the GDSS, the efficiency and the reliability of the system are very important and must be programmed specially. Under the common situation, the voting instrument is produced by the pure software method. However, the pure software method is liable to be attacked and destroyed by the computer virus and hacker program in the circumstance of the network group decision system. While, the voting model based on the hardware logic method takes the advantage of the speed and reliability over the software model. 相似文献
15.
A new kind of virtual sweep signal source which can be used to output specific sweep signal according to(users') configuration and can be widely applied to frequency characteristics measurement in the field of mechanics,electrics and electronics,is developed by using Dot Net software engineering technique,C/S architecture and general data acquisition platform.The virtual instruments not only make up the intrinsic defect of traditional instruments based on hardware components in high performance,remote control and data processing,but also indicate the powerful life and nice future of virtual instrument technologies. 相似文献
16.
The significance and current-situation of running remote maintenance are introduced. The model of maintenance service system is built on the basis of studying units. The system construction, software and hardware environment are debated. The signal monitoring software system of compressor is implemented by programming with assemble language and C language. The virtual instrument applied to on/off-line signal processing is established on the basis of Labwiew. The maintenance decision supporting system interior enterprise with TCP&UDP and the remote maintenance service system adopting B/S model are dwelled. The system is practicability testified. The goal of system developing is the integrated of all kinds of MIS. 相似文献
17.
As a standardized formal language, the SDL has widely been used in the software development. In order to extend its application field, it has been explored to use in hardware design.This paper gives a logical gate circuit-and gate as an example to explain the method of applying SDL to describe and simulate/validate the hardware characters by the SDT tool. The various logic circuits or digital circuits may be made to the SDL packages because the SDL supports the object oriented technology. These packages can be directly invoked in the design of the complex digital system, so it is possible to describe and simulate/validate the complex digital system.The experiment has proved that the application of SDL for hardware design is feasible and rather convenient. 相似文献
18.
With the analysis of the principle of time-recursive filter, the authors find that the nature of time-recursive filter is Weighted Mean Low-Pass filter and the relationship between filter coefficients and SNR and the artifact arising from the area where motion can not be tracked. One approach based on Automatic Control Method is proposed to solve the artifacts problem during the process of filtering and the authors designed the corresponding hardware based on FPGA and software respectively. The experimental results show that the time-recursive filtering is good at digital video image denoising and reduces the random noise of digital camera system. 相似文献
19.
Dot-matrix LCD makes a feature of low power dissipation,small volume,and displaying more information,also widely used in automatic instrument.To provide more better user interface, dot-matrix LCD is used as a displayer.The interface circuit for dot-matrix LCD with MCS-51 singlechip microcomputer and the design of software corresponding are described in detail.Meanings of sixteen signal wires of a port is explained.the initial program of LCD is given,and the principle of Chinese charater and menu display is introduced. The hardware design of speech terminal is simple with a LCD module,while the user interface is more beautiful with the technology of chinese character and menu display. The adjustment of LCD contrast is discussed,and the solution is given. 相似文献
20.
This paper presen ts the electric con trol devive of the hydraulic logic valve.Itcontrains mainly two parts, a push button control and a microrocomputer wireless telecontrol.Thedesign and adjustment of the hardware and the software program are also presented.The results ofthe experments to the hydraulic system of the loader show that the device has the features of smallvolume,excellent performance,low cost and easy to develop software. 相似文献