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

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

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

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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?

asked Sep 23, 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.

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

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

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

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Consider P and Q as the shaft having two rotors at the end of it, what is the point N known as in the given figure?

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.

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

asked Sep 23, 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 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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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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For the free torsional vibration of a geared system which of the following statement is true?

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A geared system possessed a strain energy if 150kJ, later it was converted into a two-rotor system connected by a shaft. The Strain energy of the equivalent system will be _____

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

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A geared system possessed a kinetic energy if 200kJ, later it was converted into a two-rotor system connected by a shaft. The kinetic energy of the equivalent system will be_____

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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For a vibration system having different shaft parameters, calculate which of the following cannot be the diameter of the equivalent shaft if the diameters of shafts in m are: 0.05, 0.06, 0.07.

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

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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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