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1.
Larger quantities of data about flight performance and flight condition are recorded by flight data recorder (FDR) during the aircraft's flying. It is an importance task to make 3D flying animation from the data on the process of flight data. The design ideas and realizing methods about the software of flying animation system driven by the data from relation database are presented.  相似文献   

2.
The DSP(digital signal processor) of TMS320C6000 series,has a special structure VLIW(very long instruc-tion word),which makes the functions of hardware depend on the efficiency of software.Therefore,when DSPs of thisseries are used to design a real-time tracking system,the executing efficiency of software will directly affect the real-timespeciality of the system.Several methods of optimizing software based on C6000 DSPs are researched,including choo-sing compiler options,use of DS Pkey words and intrinsics,data packed and software pipelining.Optimizing software ofthe whole system by using these methods,primely can solve the problem of bad real-time in processing.Consequently,the stability of the whole system is improved.  相似文献   

3.
Web Server is a software technology and communication method to carry out information issuance. The new concept of combination of equipment faults diagnoses with Web Services technology is proposed. The techniques flow of equipment, techniques parameters, signal characteristics and inference resolution in faults diagnoses are put forward with communication and software in order to carry out data dynamical exchange and interface of HMI. The remote processing on network of system information issuance is formed in this way. The principle and characteristics of Web Server technology are introduced. The common contents of information issuance in on line diagnoses system is also classified. The Web Server is applied in the project for high technology research work (863 project) "Remote and Intelligent On-line Diagnoses System for Rotational Machinery" to realize the function of information issuance and data inquire by groupware of DELPHI 6 Web Services.  相似文献   

4.
Aiming at solving the matter of fact of manufacture errors on worm, the worm test apparatus is studied by the tool research department in Chengdu.A kind of improved principle,hardware and software design of the project is discussed. The primary aim of the single chip microcomputer circuit of this project is data collecting, and the invention monopoly of professor Zhangguanghui of Chongqing university is applied. The high frequency inserted pulse is used, and the software is joined in constitute subsidiary calibration distributed on equal time. The task of online subdivision in the dynamic measure process is completed. The data are passed to PC, PC handle them and examination result is gotten. The integration of the process is very high, and the tedious and complicated hardware circuit is simplified like the tradition examination method.  相似文献   

5.
A kind of sampling circuits of piezoelectric biosensor is designed based on the CPLD devices. It is realized that 10 MHz high frequency signal measure and sampling, data display and data serial communication etc. The system has been proved to have high reliability, good real-time performance. The system architecture are discussed in detail including hardware and software, and the implementation. The simulation result of CPLD kernel and the frequency curve by sample soft are shown.  相似文献   

6.
Considering the internal dynamic excitation produced by stiffness excitation, error excitation and mesh impact excitation, a dynamic finite element model of transmission system and structure system of gearbox is established. The normal mode and the dynamic responses of gearbox under the internal dynamic excitation are calculated by using the numerical simulation software ANSYS. Based on the result of dynamic responses, the boundary excitation condition is determined, and then the acoustic boundary element model is built. With the software of SYSNOISE, the surface acoustic pressure of gearbox and the radiation noise of field points are solved by the direct boundary element method. The test of airborne noise is carried out. The computational results obtained are in a good agreement with the data of experimental test.  相似文献   

7.
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   

8.
The paper expatiates the principle of the pilger mill roll groove. A math model for optimization is set up based on various factors concerning the roll groove including the deformation theory, design process and selection of the parameters, etc. Meanwhile, the CARD techniques are combined. As a result, a software for the roll groove optimization is developed that provides such functions as groove data management, groove profile plotting and groove data printing, being a basis for relevant technological decision and groove optimization. Meanwhile, the principle and realization of complex curves are discussed. The 3D modeling is achieved by the exchange of data that is based on the CARD system.  相似文献   

9.
The errors of each parts of virtual instrument system, which are produced in the signals transfer process, are introduced. These errors include sensor error, signal conditioning error, data acquisition error and data dealing error, etc. The main error can be found by analyzing the influence of these errors on different virtual instrument system. The methods of errors modification are also discussed. It's an effective method that modifying system errors, especially nonlinear errors, by software. At last, as a good example, the error analysis and modification of Virtual Noise Analysis Instrument is given.  相似文献   

10.
如何有效地对大口径PCCP管道断丝后管道结构的安全进行合理地评价,以便采取积极有效的维修措施,是减少南水北调大口径PCCP管道运营期间断丝安全风险的有效途径。提出利用层次分析方法(AHP)建立PCCP管道安全风险层次分析数学评价模型,对影响南水北调地下大口径PCCP管道断丝的各种可能因素进行专家打分,同时,通过数值模拟计算,建立PCCP管道安全失效的判断准则及判断标准,实现大口径PCCP管道安全风险评价的定量化。在此基础上,开发出一款专门针对南水北调中线PCCP管道工程安全运行风险实时监测的管理软件。该软件系统采用自动化实时监测技术和基于Web-GIS的风险管理系统。该系统能完成监测数据的实时采集、数据档案的电子化管理以及安全风险的动态评估与预警预报。  相似文献   

11.
In this paper,the software developed on the basis of Windows platform is introduced, which is used in Chencun Waterway hydraulic model experiment. The efficiency in data analyzing and post processing has been improved. Since the various techniques in Windows platform (such as OLE, DDE) has been adopted, the development works are more efficient and an experimental analytic software with powerful and perfect functions can be developed conveniently.  相似文献   

12.
The required testing duration of software reliability demonstration testing (SRDT) for the continuous safety-critical software is generally too long to endure. To solve this problem, a new continuous Bayesian-based SRDT scheme (CBSDF) for the safety-critical software is proposed by using the decreasing function method with the prior information. The representative decreasing function of the continuous reliability index (such as the failure rate) is selected to construct the prior distribution density function (PDDF). Then, the estimation values of the hyper-parameters of PDDF are calculated according to the prior information (i.e. the failure data collected in reliability growth testing) to obtain the posterior distribution and the detailed form of CBSDF. By selecting two failure data-sets as the source of prior information, the proposed CBSDF is compared with two existing Bayesian-based schemes (i.e. CBS1 without prior information and CBS2 with prior information). The experimental results show that with the same given reliability index, the proposed CBSDF is more effective than CBS1 and CBS2 by significantly decreasing the required testing time of SRDT and more suitable for the safety-critical software with high reliability.  相似文献   

13.
Engine test-bed experiments are the main means of engine performance test, whose necessary developing trend is to apply measurement and monitoring system based on the computer. This paper introduces alteration for engine test-bed experiment system. By adopting data acquisition system, using web and ftp technique, computer-controlling and remote monitoring in real-time are realized. And the details of singlechip are mainly discussed based on data acquisition system, testing-software, web and ftp technique. The improved system realizes automation of engine test-bed experiment and data processing. It can save time and manpower, increase the productivity and improve the working condition. Especially the interface of system software developed by Delphi under Windows is simple, clear and easily dealt. The practical application proves that the new system has good value for engineering.  相似文献   

14.
The software (Integrated Resources for Evaluating Numerical Estimates) is a data analysis tool designed to provide easy access to statistical techniques for use in model evaluation. Mostly, non-replicated model estimates (Ei) are compared against non-replicated measurements (Mi). The software also allows comparing individual estimates against replicated measurements (or vice versa) and replicated estimates against replicated measurements. The evaluation of model performance is essentially based on the difference Ei−Mi, or on the correlation–regression of Ei vs. Mi (or vice versa). In addition, model evaluation by probability distributions, pattern analysis, or fuzzy-based aggregation statistics is allowed. Graphics are included in most analytical tasks. The results are displayed in separate spreadsheets and can be exported into MS Excel workbooks.  相似文献   

15.
4M is an easy-to-handle software that has been designed for both educational and scientific purposes. Our main goal in developing 4M was to preserve the features of CERES in a user-friendly software that can be easily extended with additional modules. The package has several characteristics that make it more than a simple crop model. 4M offers optional routines for several processes of the described soil-plant-atmosphere system. The users can build different system models, according to specific purposes. 4M includes input data generators for estimating soil and weather input data that are difficult to measure. 4M is able to simulate crop rotations by using the final conditions of the system after crop harvest as initial conditions for the following crop.  相似文献   

16.
农产品远程价格信息采集和发布系统的研究   总被引：1，自引：0，他引：1  
利用TC35与低功耗单片机结合设计便携式手持数据采集终端,采用手持信息采集终端收集信息,通过GSM方式传送到数据中心,数据中心负责处理和发布信息,实现了农产品远程价格信息的采集和发布,用户可通过上网或手机短信进行价格查询。系统实时性好,可靠性高,克服了以往信息采集发布的缺点,能够有效的进行农产品价格信息方面的信息传递工作及数据统计。详细阐述了手机模块TC35中SMS功能的工作原理、便携式手持终端的硬件设计与软件实现。经示范应用,系统达到了设计目标。  相似文献   

17.
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   

18.
To the question that a meter is correspond with a set of lead and a sensor,this paper presents a design of data acquisition system for vehicle based on CAN bus.In this way,the combinatorial instrument is only connected by a bus unit.Author introduces the data acquisition structure chart and the CAN interface,analyzes the software by program flow chart,and shows it's application for vehicle virtual instrument.A method of calculating vehicle speed,engine rotate speed and the course of development mileage are also given.  相似文献   

19.
Two dimensional Optimum Cutting Stock is a NP complicated problem. Each of optimum software gets the cutting results by using proximate and heuristic methods. But different optimum methods and their optimum software may not realize perfect effect according to certain data framework. Furthermore, enterprises can not buy lots of optimum software to choose the most optimized plan. Because of such problems, this paper provides a two dimensional optimum cutting stock method based on Internet and offers the real implementing technique of such method. The experiments, show that this method promotes the general optimum effect of two dimensional optimum cutting stock greatly.  相似文献   

20.
基于nRF2401的无线数据传输系统   总被引：3，自引：0，他引：3  
本设计采用工作于2.4GHz ISM频段的射频芯片nRF2401实现了非标准的无线数据传输。介绍了nRF2401的主要特性,设计了+5V单片机AT89C51与nRF2401芯片的硬件接口电路,解决了电平转换的问题,详细介绍了软件控制流程。运行表明,该系统控制方便,工作稳定,能够实现数据的双向传输。  相似文献   

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