Texts example 92 design a v belt drive to transmit power...

Texts: Example 9.2 Design a V-belt drive to transmit power from a motor rotating at 1440 rev/min and rated at 15 kW to a fan rotating at 720 rev/min. Centers are to be near to, but not more than 750 mm apart, minimum belt length is 2200 mm, and the driven pulley is not to exceed 355 mm outside diameter. TABLE 720 ys. This part is unclear and may contain errors.

Transcript

00:01 Here in the given question, the weight of the pulley is 200 newton distance from the center of the bearing that is x is equals to 300 millimeter that is 0 .3 meter, diameter of the pulley is 0 .2 meter, maximum power of transmitted that is 1000 watt, speed of the pulley is 120 revolution per minute, then angle of the left for the belt alpha is equals to 180 degree, coefficient of the friction between the belt and the pulley that is nu is equals to 0 .3, then shock fatigue factor for the blending that is it equals to 1 .5 shock fatigue factor for twisting that is 2, allowable shear stress that is 35 mega and diameter of the pulley is 0 .2 meter.

00:55 So, to calculate the radius that is radius is diameter upon 2 that is equals to radius is equals to 0 .1 meter, it is diameter upon 2, then to calculate the tension in the belt that is t1 upon t2 is equals to e into nu into alpha.

01:21 So, the value of t1 is equals to t2 into e into 0 .3 into 180 degree whole into into we have to convert it into the radian that is pi upon 180.

01:45 So, the value here find out to be t1 is equals to t2 into 2 .5663.

01:56 So, here t1 is the tension in the tight side and t2 is the tension in the slack side.

02:02 So, to calculate the t1 and t2 we have the expression that is t1, t is equals to t1 minus of t2 whole into r.

02:15 So, expression to calculate the t is p is equals to t into omega.

02:22 So, expression to calculate the omega that is omega is equals to 2 pi into n upon 60, here n is the frequency.

02:33 So, it is given as 2 pi into 120 upon 60.

02:39 So, it means you have to convert in seconds, you have converted in it is it into seconds.

02:49 So, it is 12 .566 radian per second.

02:56 So, substituting the value of the expression.

02:59 So, 1000 into w is equals to this is the power is equals to t into 2.

03:08 Sorry 12 .566.

03:13 So, here the value of t comes to be 79 .5798.

03:19 So, substituting the value in the above equation that is 79 .5798 newton meter is equals to t1 minus t2 whole into 0 .1 meter that is radius.

03:38 So, t1 minus t2 is equals to 795 .798.

03:46 So, t2 into 2 .5663 minus t2 the value of t1 is t2 into 2 .5663...

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