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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These readings encompasses the distance between the wires used for the suspension, the length of the wires, the time for the required number of oscillations, the distance between the masses introduced into the experiment, and so on. All these and lots more provide the avenue for determining the radius of gyration and the moment of inertia. Posted by JohnWell Academy at A diagram on the arrangement suspensiom the apparatus used is illustrated below: 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.

Repeat to obtain another 10T measurement and then calculate the average of your two measurements. Documents Flashcards Grammar checker.

Since the rectangular bar has bored holes within it, therefore its moment of inertia is.

Two small chucks are provided for attachment. Nonetheless, a description of its angular motion is enumerated below. Where Mo is the mass of the hole bored, Ro is the radius of each hole bored and X is the distance from each hole on either side to the centre of the rectangular bar. For a solid object with a rectangular cross-section, the same general approach gave rise to determination of the moment of inertia about its centre of mass G and this is sjspension as.

Reaction Time Lab Ruler Drop. The equation of the angular motion is: A primary focus of Strength of Materials are materials classified as. The length of the wire L was then fixed at a value and the time taken bifioar recorded for 20 oscillations at varying distances xbetween the two 1.


Thickness of the bar. The experiment is done such that the oscillation was not dampened by carefully tilting the bar before release for oscillations. Do not tie the threads too tightly as you will need to vary the distance D during the experiment. Why is it important not to let the total time measurement see stage 4 fall below about 10 seconds? Distance between the wires, b. Mass of the bar m. Early Middle Ages Quiz. Laboratory Sudpension for Phys. In this case the body under investigation is bolted to the center of the suspended bar and the periodic time of the combined bar and body measured.

This is bifilarr the auxiliary mass method but for this experiment, our analysis would be on just the generic bifilar suspension approach. Science Biology Kinesiology Bifialr Suspension advertisement.

The beam should oscillate in the horizontal plane only. bifillar

This rectangular bar contains holes equidistant from each other and two extra with equal masses of 1. With the bar suspended by the wires, the length L was adjusted to a convenient extent and then distance, bbetween the wires was measured.

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Measurement taken from the rule and the weight balance was done such that the line of sight and the markings of the measuring equipments were in alignment in to reduce errors due to parallax.

Chucks are also in place to alter length of suspended wires. The values of a and the power b can be found by the method you have used see full theory below. Length of bar l. The moment of inertia determined using the analytical approach was approximately equal to the value determined from test 2 in table 2 above. Record distance D in cm, which should initially be about 60cm. Moment of inertia values.

007 The Bifilar Suspension

Whereby individual moments of inertia from individual bifilsr 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. Documents Flashcards Grammar checker. The suspension may also be used to determine the radius of gyration of any body. The length L was further adjusted and the time taken for another 20 oscillations was recorded.


In this situation the length of the wires are kept constant and the distances between the two equal masses are varied. The periodic time significantly increased when the length of the wires also go increased. Precautionary methods were in place to keep the masses at a very comfortable position so as to avoid slip or fall which could bifllar cause harm to our feet. Set up the above apparatus with two lengths of thread of equal lengths approx. What is the basic assumption that is based on assuming a small angle of oscillation?

The bar was then tilted through a very small angle about the vertical axis and time taken for 20 oscillations of the bar, was recorded.

From equation 10 above. Tabulate your results and include two extra columns showing the logarithms of both T and D Supension should label these columns as follows: Measure the gradient, m and calculate the y-axis intercept, c of your graph.

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.

The Bifilar Suspension

The periodic time also increased when the distances between the masses added to system reduced. In addition an enclosed-type measuring tape suapension weight balance were also used for the experiment. Then the values obtained from experiment will be compared with the value obtained analytically, using the geometry and dimensions of the beam.

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