TitleOscillationofaTorsionalSpring-CLAYMORE标题一扭转弹簧-大剑.doc

Title: Oscillation of a Torsional SpringAuthor: Wade W. BernreuterLab Partner: Erin EddyDate: 10/19/99Purpose: To study torsional oscillation using Labview and computer data collection.Theory: Suppose a large symmetric rotation mass has a rotational inertia, J, and a twisting rod has a torsional spring coefficient, K. Recall the basic torsional relationships.We can calculate the torsional spring coefficient using the basic mechanics of materialsFinally, consider the rotating mass on the end of a torsional rod.Equipment:1 -table clamp1 -computer with LabView and MathCad software1 -LabView data acquisition card1 -potentiometer1 -weight scale1 -protractor1 -25” long torsional spring2 -24” x 4” x 4” aluminum bar masses fastened to spring1 0 to 3000 gram weight scale1 table1 -stopwatchProcedure:1. Assemble the torsional spring and rotating mass. Program LabView to read the rotation of the spring with varying voltage by means of the potentiometer. Attach the potentiometer to the axis of rotation of the torsional spring. Clamp the spring and mass to the table.2. Pull the end of the mass with a set amount of force as determined by the weight scale and measure the amount of rotation with the protractor and voltage difference from the potentiometer. Start recording the voltage output of the potentiometer with LabView and release the scale. Time the amount that is necessary for twenty rotations in order to determine the frequency of the torsional spring.3. Repeat step 2 for other forces to determine variances in data and to ensure that legitimate data was accum