ME DYNAMICS OF MACHINERY LABORATORY EXPERIMENTS BIFILAR SUSPENSION INTRODUCTION The Bifilar Suspension is a technique that could . Oscillation of a bifilar suspension Apparatus: Two retort stands/clamps/ bosses, two metre rulers, stop watch, two lengths of cotton thread. two threads. Bifilar suspension. If a rod of moment of inertia I and mass m is hung from two threads of length L and separated by a distance d (Figure 1) and is oscillated in a .

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This also provides another approach to the determination of the moment of inertia of the body. The length L was further adjusted and the time taken for another 20 oscillations was recorded.

Bifilar Suspension

The experiment is done such that the oscillation was not dampened by carefully tilting the bar before release for oscillations. Early Middle Ages Quiz. From this, the periodic time was also calculated.

To determine the moment of inertia of a horizontal rectangular drop bar about its center of mass using the bifilar suspension technique.

However, the approach taken for this experiment is to determine the moment of inertia of a drop by suspending the cords through the mass centre of bodies, obtaining an angular displacement about the vertical axis through the centre of mass by a sensibly small angle.

Then step 3 was repeated but with different values of L. Newer Post Older Post Home. The beam should oscillate in the suspenslon plane only.

Where Io is the moment of inertia of the bored holes. However, if the total time is less than 10 seconds you should record the time for 15 15T or of 20 20T oscillations. Chucks are also in place to alter length of suspended wires.


The moment of inertia calculated analytically is 0. Estimate the percentage uncertainties in: Two small chucks are provided for attachment. Note the there are 15 holes bored, hence its introduction in equation 8. Mass of each added mass. The length of the wire L was then fixed at a value and the time taken was recorded for 20 oscillations at varying distances xbetween the two 1.

From equation 10 above. Laboratory Manual for Phys. Science Biology Kinesiology Bifilar Suspension advertisement. Additional table 4 extrapolated from table 2. The suspension may also be used to determine the radius of gyration of any body.

In this situation the length of the wires are kept constant and the distances between the two equal masses are varied. The period T of a bifilar suspension is expected to be given by an equation of form: The bifilar suspension is a technique used to determine the moment of inertia of any type of object about any point on the object. Do not tie the threads too tightly as you will need to vary the distance D during the experiment.

The Bifilar Suspension

Chapter 11 The Age of Imperialism. Therefore, Moment of inertia of the bar, I is. The moment of inertia determined from the suspebsion representation was greater than the value gotten from the analytical approach indicating that the two masses added suspensuon the experiment had a part to play in the increment of the moment of inertia and also unavoidable human errors caused a variation in their values. Bigilar the time for one oscillation T.

The internal diameters of the holes, the thickness of the rectangular were also measured. From the relationship between the periodic time of oscillation of the suspended bar, and the effective length of the suspension wires the radius of gyration of the suspended bar may be found and compared with die theoretical value.


Then the values obtained from experiment will be compared with the value obtained analytically, using the geometry and dimensions of the beam.

Applications of digital signal processing to beam instrumentation.

suspensioj This is done by suspending two parallel cords of equal length through the object examined. The bifilar suspension technique offers the opportunity to determine the radius of gyration of a body by relating the readings gotten from the procedure in the techniques and relating that into the equation of angular and this invariably provides the determination of the moment of inertia for the same body.

Beginning of American History. The periodic time significantly increased when the length of the wires also go increased. Whereby individual moments of inertia from individual differential mass value and distance X between the axis point and the object are summed up and its summations gives rise to the final moment of inertia of that body.

In addition an enclosed-type measuring tape and weight balance were also used for the experiment. All these and lots more provide the avenue for determining the radius of gyration and the moment of inertia.

Repeat the above for seven more different values of Bkfilar. Principle of moments experiment – science. The cords pass through the two small chucks fitted to the biiflar frame and are secured in the bifilar bar by two similar chucks so that by loosening the chucks the cords auspension be dawn through and their effective length altered.