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An air compressor of mass 100 kg, with an unbalance of 0.01 kg-m, is found to...
6 720 SECTION B- Attempt any TWO Questions from this Section. 4 An air compressor experiences exc...
6 720 SECTION B- Attempt any TWO Questions from this Section. 4 An air compressor experiences excessive vibrations when running at 1100 rpm. It is fitted with a tuned dynamic absorber in order to reduce these vibrations. The mass of the compressor, me, is 80 kg and the total stiffness of its supports, kc, is 1075 kN/m. The amplitude of the out of balance force, P, is 30 N The compressor with the absorber in place is shown in Figure...
Please answer all Questions if you can let someone who can A 200 kg machine is...
Please answer all Questions if you can let someone who can
A 200 kg machine is mounted on springs whose stiffness is 5x105 N/m. The machine has an exciting force of 1000sin(53t). (a) What is the steady-state amplitude if no vibration absorber is added? (b) Design a vibration absorber of mass 40 kg such that the steady-state amplitude of the primary system is zero at 53 rad/s. (c) What are the natural frequencies of the two degree of freedom system...
Q-3 (25 pts) An industrial machine of total mass M-600 kg is supported on springs with a static d...
Q-3 (25 pts) An industrial machine of total mass M-600 kg is supported on springs with a static deflection of 5.9 mm. The machine has a rotating unbalance of m40 kg (part of the total mass) at an effective eccentricity of es3.0 mm. Determine the amplitude of resulting vibration and phase angle when the unbalance rotates at -350 rpm. The system is damped with a dashpot of ce 15000 Ns/m. M Consider only vertical effects
Q-3 (25 pts) An industrial...
3. A compressor of mass 700 kg has undamped spring mountings which deflect by 0.5 mm...
3. A compressor of mass 700 kg has undamped spring mountings which deflect by 0.5 mm under its weight. This compressor, on its mountings, is installed on a flexible floor whose mass of 1400 kg may be considered as concentrated below the compressor. The floor has negligible damping. The highest natural frequency of vertical vibration of this combined system must not exceed 1.5 times that of the compressor with its spring mountings on a rigid foundation. Find a suitable value...
QUESTION 10 Q8 (a): shock absorber for a car is to be designed. The system can be considered as simple SDOP system with a mass of m kg as shown in figure (below) and its damped free vibration res...
QUESTION 10 Q8 (a): shock absorber for a car is to be designed. The system can be considered as simple SDOP system with a mass of m kg as shown in figure (below) and its damped free vibration response is shown beside that. The damped period of vibration is to be Td sec. n u It is observed that the amplitude reduced to,% of initial value after 2 oscillations. x(o) 2 For the above question, determine the damped natural frequencies...
. Problem E2-1 An exhaust fan of mass 400 kg is mouned on an elastic support...
. Problem E2-1 An exhaust fan of mass 400 kg is mouned on an elastic support having a spring constant of 80 kN/m and a damping ratio of 2%. If the fan has a rotating unbalance of 0.15 kg-m and operates at 1,800 rpm, determine (a) the steady-state amplitude of vibration of the fan (b) the force transmitted to the ground; (c) the new spring constant of the elastic support such that there is no more than 50% of the...
6- An air compressor of mass 50 kg is mounted on an elastic support and operates...
6- An air compressor of mass 50 kg is mounted on an elastic support and operates at a speed of 1000 rpm. It has an unbalanced mass of 2 kg at a radial distance (eccentricity) of 0.1 m from the axis of rotation. If the damping factor of the clastic support is 3 = 0.1, determine the following: (a) the spring constant of the elastic support which transmits no more than 25% of the unbalanced force to the foundation, and...
An air compressor of mass 120 kg is mounted on an elastic foundation. It has been...
An air compressor of mass 120 kg is mounted on an elastic foundation. It has been observed that, when a harmonic force of amplitude 120 N is applied to the compressor, the maximum steady-state displacement of 5 mm occurred at a frequency of 320 r/min. Determine the equivalent stiffness and damping constant of the foundation.
A small motor driven paint compressor set of mass 27 kg sits on rigid, massless platform...
A small motor driven paint compressor set of mass 27 kg sits on rigid, massless platform that is supported by 4 spring-damper isolators (each isolator is composed of a spring and damper) for which cach spring constant is 13245 N/m. When the motor runs, it runs at a constant speed of 1750 rpm. The compressor piston has a 50 mm stroke (double its eccentricity). The piston and reciprocating parts have a mass of 0.5 kg, and the motion of the...
Problem # 4 15 points The base of a damped spring-mass system, with m 25 kg...
Problem # 4 15 points The base of a damped spring-mass system, with m 25 kg and k 2500 N/m, is subjected to a harmonic excitation y(t) Xo cos ω. The amplitude of the mass is found to be 0.05 m when the base is excited at the natural frequency of the system with Yo 0.0 m. Determine the damping constant of the system.
6 720 SECTION B- Attempt any TWO Questions from this Section. 4 An air compressor experiences excessive vibrations when running at 1100 rpm. It is fitted with a tuned dynamic absorber in order to reduce these vibrations. The mass of the compressor, me, is 80 kg and the total stiffness of its supports, kc, is 1075 kN/m. The amplitude of the out of balance force, P, is 30 N The compressor with the absorber in place is shown in Figure...
Please answer all Questions if you can let someone who can
A 200 kg machine is mounted on springs whose stiffness is 5x105 N/m. The machine has an exciting force of 1000sin(53t). (a) What is the steady-state amplitude if no vibration absorber is added? (b) Design a vibration absorber of mass 40 kg such that the steady-state amplitude of the primary system is zero at 53 rad/s. (c) What are the natural frequencies of the two degree of freedom system...
Q-3 (25 pts) An industrial machine of total mass M-600 kg is supported on springs with a static deflection of 5.9 mm. The machine has a rotating unbalance of m40 kg (part of the total mass) at an effective eccentricity of es3.0 mm. Determine the amplitude of resulting vibration and phase angle when the unbalance rotates at -350 rpm. The system is damped with a dashpot of ce 15000 Ns/m. M Consider only vertical effects
Q-3 (25 pts) An industrial...
3. A compressor of mass 700 kg has undamped spring mountings which deflect by 0.5 mm under its weight. This compressor, on its mountings, is installed on a flexible floor whose mass of 1400 kg may be considered as concentrated below the compressor. The floor has negligible damping. The highest natural frequency of vertical vibration of this combined system must not exceed 1.5 times that of the compressor with its spring mountings on a rigid foundation. Find a suitable value...
QUESTION 10 Q8 (a): shock absorber for a car is to be designed. The system can be considered as simple SDOP system with a mass of m kg as shown in figure (below) and its damped free vibration response is shown beside that. The damped period of vibration is to be Td sec. n u It is observed that the amplitude reduced to,% of initial value after 2 oscillations. x(o) 2 For the above question, determine the damped natural frequencies...
. Problem E2-1 An exhaust fan of mass 400 kg is mouned on an elastic support having a spring constant of 80 kN/m and a damping ratio of 2%. If the fan has a rotating unbalance of 0.15 kg-m and operates at 1,800 rpm, determine (a) the steady-state amplitude of vibration of the fan (b) the force transmitted to the ground; (c) the new spring constant of the elastic support such that there is no more than 50% of the...
6- An air compressor of mass 50 kg is mounted on an elastic support and operates at a speed of 1000 rpm. It has an unbalanced mass of 2 kg at a radial distance (eccentricity) of 0.1 m from the axis of rotation. If the damping factor of the clastic support is 3 = 0.1, determine the following: (a) the spring constant of the elastic support which transmits no more than 25% of the unbalanced force to the foundation, and...
A small motor driven paint compressor set of mass 27 kg sits on rigid, massless platform that is supported by 4 spring-damper isolators (each isolator is composed of a spring and damper) for which cach spring constant is 13245 N/m. When the motor runs, it runs at a constant speed of 1750 rpm. The compressor piston has a 50 mm stroke (double its eccentricity). The piston and reciprocating parts have a mass of 0.5 kg, and the motion of the...
Problem # 4 15 points The base of a damped spring-mass system, with m 25 kg and k 2500 N/m, is subjected to a harmonic excitation y(t) Xo cos ω. The amplitude of the mass is found to be 0.05 m when the base is excited at the natural frequency of the system with Yo 0.0 m. Determine the damping constant of the system.
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