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

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

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

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

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What is the total number of nodes formed in a three rotor system if the rotors at one of the ends and the one in the middle rotate in the same direction?

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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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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

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

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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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For occurrence of free torsional vibration in a three rotor system which of the condition is necessary?

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

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Keeping the mass moment of inertia of left end and the right end shafts in a three 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 a three rotor system, for the middle rotor, if the stiffness of both the length either side of the rotor is increased to two times what will be the effect on total stiffness of the middle rotor?

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

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In a two rotor system, torsional vibration occurs only if the rotors are moving in the same direction.

asked Sep 22, 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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For a three rotor system in the figure given below, the length of one shaft(P) is twice the other(Q), then what is the relation between the Mass moment of inertia of the shafts.

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

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In the given figure, considering PN as one shaft, If the mass moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a rotor at P?

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

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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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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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For a gearing system, the equivalent system is made consisting of three rotors. How many nodes will this new equivalent system will have?

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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Which of the following relation is correct regarding free torsional vibrations of a single motor system?

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

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In the given figure if N1 is the node then N1Q acts as which of the following system?

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

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In a geared system free torsional vibration will take place when the Inertia of gear is taken into consideration.

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

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For a gearing system, the equivalent system is made consisting of two rotors. How many nodes will this new equivalent system will have?

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

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A flywheel is mounted on a vertical shaft. The both ends of a shaft are fixed and its diameter is 50 mm. The flywheel has a mass of 500 kg, the modulus of rigidity for the shaft material is 80 GN/m^2 and its radius of gyration is 0.5 m. Find the natural frequency of torsional vibrations.

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

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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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