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The tail rotor section of a Black Hawk helicopter shown in the image consists of four...
The tail rotor section of a Black Hawk helicopter consists of four blades, each has a...
The tail rotor section of a Black Hawk helicopter consists of four blades, each has a mass of 2 [kg), and a gear box that weights 38 [kg]. The center of gravity of each blade is 0.4 [m] from the rotational axis. The tail section is connected to the main body of the helicopter by an elastic structure. The natural frequency of the tail section is observed as 135 [rad/s]. During flight, the rotor operates at 850 [r/min). 1- Calculate...
Rotating unbalance is also impportant in rotorcraft such as helicopters and prop planes. The tail rotor...
Rotating unbalance is also impportant in rotorcraft such as helicopters and prop planes. The tail rotor section of the helicopter shown consists of four blades, each of mass 2.3 kg, and an engine box of mass 28.5 kg. The center of gravity of each blade is 170 mm from the rotational axis. The tail section is connected to the main body of the helicopter by an elastic structure. The natural angular frequency of the tail section is observed as 135...
Rotating unbalance is also important in rotorcraft such as helicopters and prop planes. The tail rotor of a helicopter (the small rotor rotating in a vertical plane at the back of a helicopter use...
Rotating unbalance is also important in rotorcraft such as helicopters and prop planes. The tail rotor of a helicopter (the small rotor rotating in a vertical plane at the back of a helicopter used to provide yaw control and torque balance) as sketched in Figure 2.21 can be modeled as a rotating-unbalance problem discussed in this section with stiffness k 1 x 105 N/m (provided by the tail section in the vertical direction) and mass of 20 kg.The tail section...
Let us treat a helicopter rotor blade as a long thin rod, as shown in the...
Let us treat a helicopter rotor blade as a long thin rod, as shown in the figure. (Figure 1) . If each of the three rotor helicopter blades is 3.75 m long and has a mass of 135 kg, calculate the moment of inertia of the three rotor blades about the axis of rotation. b- How much torque must the motor apply to bring the blades from rest up to a speed of 5.9 rev/s in 10 s ?
A 100 [kg] reciprocating internal combustion engine is fitted to a thin, massless beam using a...
A 100 [kg] reciprocating internal combustion engine is fitted to a thin, massless beam using a vibrations damper. It is known that a machine with a rotating unbalance experiences a frequency squared harmonic excitation. The magnitude of the rotating unbalance is A = m,e = 0.3 [kg. m). 1. Calculate the nondimensional function for the state that has a steady state amplitude of 10 [mm] at a 90 [rad/s] speed. 2- Determine the frequency ratio, natural frequency, and the beams...
2 with spring stiffness k 1000 N/m, Consider a mass-spring-damper system shown in Figure mass m...
2 with spring stiffness k 1000 N/m, Consider a mass-spring-damper system shown in Figure mass m = 10 kg, and damping constant c-150 N-s/m. If the initial displacement is xo-o and the initial velocity is 10 m/s (1) Find the damping ratio. (2) Is the system underdamped or overdamped? Why? (3) Calculate the damped natural frequency (4) Determine the free vibration response of the system.
This document consists of 04 printed pages [Turn over Question 1 (CLO 1, PLO 2, C3)...
This document consists of 04 printed pages [Turn over Question 1 (CLO 1, PLO 2, C3) Calculate the total energy in a damped system with frequency 2 rad's and damping ratio ( = 0.01 with mass 10 kg for the case xo = 0.1 m and vp=0. [25] I Rocker arm Follower Valve spring Oil Question 2 (CLO 1, PLO 2, C3) A rough sketch of a valve-and-rocker arm system for an internal combustion engine is given in Figure OHT...
Consider a single degree of freedom (SDOF) with mass-spring-damper system
Consider a single degree of freedom (SDOF) with mass-spring-damper system subjected to harmonic excitation having the following characteristics: Mass, m = 850 kg; stiffness, k = 80 kN/m; damping constant, c = 2000 N.s/m, forcing function amplitude, f0 = 5 N; forcing frequency, ωt = 30 rad/s. (a) Calculate the steady-state response of the system and state whether the system is underdamped, critically damped, or overdamped. (b) What happen to the steady-state response when the damping is increased to 18000 N.s/m? (Hint: Determine...
The tail rotor section of a Black Hawk helicopter consists of four blades, each has a mass of 2 [kg), and a gear box that weights 38 [kg]. The center of gravity of each blade is 0.4 [m] from the rotational axis. The tail section is connected to the main body of the helicopter by an elastic structure. The natural frequency of the tail section is observed as 135 [rad/s]. During flight, the rotor operates at 850 [r/min). 1- Calculate...
Rotating unbalance is also important in rotorcraft such as helicopters and prop planes. The tail rotor of a helicopter (the small rotor rotating in a vertical plane at the back of a helicopter used to provide yaw control and torque balance) as sketched in Figure 2.21 can be modeled as a rotating-unbalance problem discussed in this section with stiffness k 1 x 105 N/m (provided by the tail section in the vertical direction) and mass of 20 kg.The tail section...
A 100 [kg] reciprocating internal combustion engine is fitted to a thin, massless beam using a vibrations damper. It is known that a machine with a rotating unbalance experiences a frequency squared harmonic excitation. The magnitude of the rotating unbalance is A = m,e = 0.3 [kg. m). 1. Calculate the nondimensional function for the state that has a steady state amplitude of 10 [mm] at a 90 [rad/s] speed. 2- Determine the frequency ratio, natural frequency, and the beams...
2 with spring stiffness k 1000 N/m, Consider a mass-spring-damper system shown in Figure mass m = 10 kg, and damping constant c-150 N-s/m. If the initial displacement is xo-o and the initial velocity is 10 m/s (1) Find the damping ratio. (2) Is the system underdamped or overdamped? Why? (3) Calculate the damped natural frequency (4) Determine the free vibration response of the system.
This document consists of 04 printed pages [Turn over Question 1 (CLO 1, PLO 2, C3) Calculate the total energy in a damped system with frequency 2 rad's and damping ratio ( = 0.01 with mass 10 kg for the case xo = 0.1 m and vp=0. [25] I Rocker arm Follower Valve spring Oil Question 2 (CLO 1, PLO 2, C3) A rough sketch of a valve-and-rocker arm system for an internal combustion engine is given in Figure OHT...
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