For occurrence of free torsional vibration which of the condition is necessary?

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A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a two node system in Hz if the mass moment of inertia of rotors in Kg-m^2 are: 0.15, 0.3 and 0.09. C=84 kN/mm^2

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A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a single node system in Hz if the mass moment of inertia of rotors in Kg-m^2 are: 0.15, 0.3 and 0.09. C=84 kN/mm^2

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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Increasing which of the following factor would result in increase of free torsional vibration?

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In a three rotor system, free torsional vibration cannot occur if there is only one node.

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If radius of gyration increases then the torsional free vibration increases.

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

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For a two rotor system, the mass moment of inertia of one shaft(A) is twice the other(B), then what is the relation between the length of the shafts.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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For a two rotor system, the length of one shaft(A) is twice the other(B), then what is the relation between the Mass moment of inertia of the shafts.

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In the given figure if N is the node then NQ acts as which of the following system?

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Keeping the mass moment of inertia of both the shafts in a two rotor system same, if the length of one shaft is doubled what should be the effect on the length of other shaft?

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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In the given figure representing a two rotor system, what is the line LNM called?

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In a gearing system, pump speed is one third of the motor. Shaft from motor is 6 cm in diameter and 30cm long, the impellar shaft is 10cm diameter and 60cm long. Mass moment of inertia is 1500 Kg-m^2, C = 80Gn/m^2. Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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the given figure, considering left end has one rotor, If the mass moment of inertia of the shaft till node N1 is increased to four times, then what will be the effect on free torsional vibrations of a rotor at left end of N1?

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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If the polar moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a single motor system?

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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If the length inertia is decreased to nine times, then what will be the effect on free torsional vibrations of a single motor system?

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

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If the mass moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a single motor system?

asked Sep 22, 2022 in Machine Dynamics by Grayson (34.3k points)

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Free torsional vibrations will occur in a three rotor system only if all rotors have same frequency.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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Free torsional vibrations of a single motor system increases with increase in polar moment of inertia.

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

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