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Session 2168

Structural Response in the Frequency Domain using LabView

Kevin Murphy, Ismail I. Orabi University of Connecticut/ University of New Haven

Abstract

This paper describes the implementation of LabView, in an experiment in an instrumentation laboratory in the mechanical engineering department, to allow the acquisition of real time data for display, analysis, control and storage. The system is set in motion with a calibrated impact hammer. This hammer produces a voltage, which is proportional to the impact force. This force is sent to the LabView VI for analysis. Similarly, the accelerometer produces a voltage that is proportional to the acceleration of the club (this represents the response of the club). This signal is also sent to the computer via the signal conditioners and the DAQ board. The goal is to carry out real-time measurements and displays acquired waveforms on a PC screen and also store data associated with these waveforms for later use. The objective of this lab is to examine the response of a structure in the frequency domain, as opposed to the typical time domain. In particular, the vibration characteristics of a golf club are examined by applying an impulsive load using a calibrated impact hammer. The time domain signals are then analyzed using LabView software to obtain a spectrum response.

Introduction

The use of a computer to imitate an instrument or device is known as virtual instrumentation. One software development package used to create virtual instruments is LabView (Laboratory Virtual Instrument Engineering Workbench). LabView is a graphical programming language that, when used in conjunction with a data acquisition device and personal computer, allows the user to control devices, collect, manipulate and display data. Written code is not used in LabView instead graphical representations of the circuits are constructed which are called virtual instruments (VI’s). These VI’s are manipulated so that they will perform the desired tasks at hand. The VIs (virtual instruments) in LabView are run from their front panels. This is the panel with all of the controls and displays. Each front panel has an associated block diagram. This block diagram is built using the graphical programming language G. The components of the block diagram represent different structures, loops and functions. The wiring of the block diagram represents flow of data between these components. A VI becomes a sub VI when it is placed inside the block diagram of another VI. These sub VIs are analogous to sub routines, and allow layering and modularity of the VIs.

Proceeding of the 2001 American Society for Engineering Education Annual Conference & Exposition Copyright 2001, American Society for Engineering Education

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Murphy, K., & Orabi, I. (2001, June), Structural Response In The Frequency Domain Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9801