Virtual Test System Research Articles

Virtual Instrument-Based Cable and Harness Test System Hardware Design and Development

The virtual instruments utilize the powerful graphic environment and on-line help of computer to establish the virtual instrument panel and control the instrument, analyze and display the data, replace the traditional instruments and change their using modes, improve their functions and efficiency. This system utilized the virtual instruments technology, and PC/104 bus-based embedded data acquisition to develop the cable and harness test hardware system.

Construction and Realization of Networked Virtual Test System Based on LabVIEW

This paper analyses the construction mode and the structure composition of hardware and software of networked virtual test system; explores solutions and realization technology for LabVIEW-based networked virtual test; carries out researches on remote control technology of networked virtual instrument; develops the networked virtual data acquisition and processing system based on LabVIEW; realizes the acquisition, transmission and processing of remote data as well as the remote control of the running state of virtual instrument.

Development of Tractor Slippage Virtual Test System

A new method is proposed and discussed in this paper, based on Virtual Prototyping Technology. The aim is to test the wheel-type tractor slippage which is an important index to indicate whether the engine power is fully converted by the wheels into the traction applied to the implements. A 3D model of an existing two-wheel drive tractor (SH500) is constructed in the 3D design software Pro/Engineer and exported out into the virtual prototyping software ADAMS in which the slippage virtual test system is established and the slippage virtual test is carried out. For a general purpose, the virtual system is parameterized so that the parameters as system inputs to define work conditions could be modified by users in terms of specific environment. To verify its feasibility and validation, the virtual test system is set up to work under two given conditions. Results show that the slippage remains almost the same at constant traction, whose averages are 10.36% and 16.69% at 5.4kN and 9.8kN, respectively. So, this means that it is possible to construct a virtual system to acquire the slippage without the necessity of a physical test system and field experiment which are both costly and time-consuming.

The Application Research of Virtual Prototyping Technology in the Design of Oil Field Pumping Units

Regulating diameter-variable moment pumping unit as the research object. which been analysed by virtual prototyping technology, by this way, the application ways and realization means of virtual prototyping technology is explored in this field.The virtual prototyping technology is introduced into the dynamic characteristics analysis and optimization for pumping units, and the 3D CAD software, multibody system dynamics analysis software and finite element analysis software were combined. The digital physical prototype for pumping units is established by UG software; ADAMS was Used to establish the function virtual prototype and virtual test system, to develop the test analysis and optimize its structure parameters according to the movement requirements for pumping units; The finite element analysis of the pumping unit parts is processed in the ANSYS environment, and structural design is optimized in accordance with the stress distribution characteristics of pumping components. In this paper, CAD and CAE technology are used with close combination, the pumping units dynamics analysis and simulation is developed from the systemic perspective. The research has the characteristics of high precision analysis, wide range of applications and good practical value.

263 機械システムの機能を表現するモデル化手法 : 機能モデルとボンドグラフの比較(モデリング・シミュレーション,OS-2 運動と振動のモデリングと制御(3))

Two kinds of modeling approaches, namely the functional model and the bond graph, are introduced and compared each other. Both of them can explain flow and transform of energy among different physical fields, for example mechanic, electric, fluidic and thermal areas, by the common method over engineering disciplines. Functional model proposed by the authors is used as the core approach of virtual testing system for product development of machines. First, outlines of functional model and bond graph are introduced. Second, single degree of freedom mechanical and electrical systems are modeled by these two approaches as simple examples. Third, difference points between these two approaches are stated.