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A vibrometer having a natural frequency of 4 rad/s and damping ratio of 0.2 is attached to a structure that performs a harmonic motion
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A cylinder of mass m and radius r rolls without slipping on a concave cylinder surface of radius R. find the natural frequency of oscillations.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A refrigerator weighing 30 kg is to be supported by three springs each having stiffness of K (N/m) if the unit operates at 580 rpm,
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A vehicle has mass of 1200 kg. the suspension system has a spring const. of 400 KN N/m and damping ratio of 0.5. If the vehicle speed is 20 km/hr. determine (x) the disp amplitude of the vehicle.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A machine 100kg mass has a 20kg rotor with 0.5mm eccentricity.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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Numerical : 6
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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In a spring loaded governor of Hartnell type, the mass at each ball is $1kg$, length of vertical arm of bell crank lever is $100 mm$ and that of horizontal arm is $50 mm.$
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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The crank and connecting rod of a steam engine are $0.3m$ and $1.5m$ in length. The crank rotates @ $180 rpm$ clockwise.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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In a spring loaded Hartnell type governor, the extreme radii of rotation of the balls are $80mm$ and $120mm.$ The ball arm and the sleeve arm of the bell crank levels are equal in length.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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(B) FORCED VIBRATION DUE TO THE ROTATING AND RECIPROCATING UNBALANCE.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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An accelerometer has a suspended mass of 0.01 kg with a damped natural frequency of vibration 150 Hz
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A seismic instrument with natural frequency of 6Hz is used to measure the vibration of machine running at 120 rpm.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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In an engine governor of the porter type, the upper and lower arms are $200mm$ and $250mm$ respectively and pivoted on the axis of rotation. The mass of the central load is $15kg.$
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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Explain Centrifugal Governor.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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STEPS OF VIBRATION ANALYSIS.
dynamics of machinery updated 5.0 years ago by teamques10 ★ 65k
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Determine the natural frequency of the system shown in figure, the cord may be assumed in extensible and no slip between pulley and cord.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A rail road bumper is designed as a spring in parallel with viscious damper. What is the bumper's damping (c) co-efficient such that system has a damping ratio 1:25 when engaged by a 20 tonnes
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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VIBRATION ISOLATION AND TRANSMISSIBILITY.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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VIBRATION MEASURING INSTRUMENTS.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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DAMPING RATIO OR DAMPING FACTOR.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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All the arms of a porter governor are $178mm$long and are hinged @ a distance of $38mm$ from the axis of rotation. The mass of each ball is $1.15 kg$ and mass of each sleeve is $20 kg.$
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A tail rotor section of the helicopter consistent of four blades, each of mass 2.3 kg and an engine box of mass 28.5 kg. The centre of gravity of each blade is 170 mm from the rotational axis.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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Determine the natural frequency of oscillation
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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Forces on the Reciprocating parts of an engine, Neglecting the weight of the connecting rod.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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A door 200 cm high, 75 cm wide and 4 cm thick and weighing 35 kg is fitted with an automobile door closer. The door opens against a spring with a modulus of 1kg cm/radian.
dynamics of machinery updated 4.9 years ago by bhaveshkumarn.pasi • 500
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