B9 Please help on the attached question. Q9. One of the tail rotor blades of a helicopter has an unbalanced mass of m = 0.5 kg at a distance ofe = 0.15 m from the axis of rotation, as shown in Fig. The tail section has a length of 4 m, a mass of240 kg, a flexural stiffness (EI) of 2.5 MN-m², and a damping ratio of 0.15. The mass of the tailrotor blades, including their drive system, is 20 kg. Determine the forced response of the tail sectionwhen the blades rotate at 1500 rpm.Tail section, ElUnbalance in tail rotor blade of helicopter.Tail rotor bladesm

Answered: Q9. One of the tail rotor blades of a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Mohammed Mahad Tabook A lathe can be modeled as an electric motor mounted on a steel table. The table plus rotor have a mass of 100 kg. The rotating parts of the lathe have a mass of 10 kg at a distance 0.1 m from the center. The damping ratio of the system is measured to be zeta= 0.06 (viscous damping) and its natural frequency is 7.5 Hz and the driving frequency is 30HZ The natural frequency in rad/s is Choose.. The driving frequency in rad/s is Choose... The frequency ratio is Choose... The amplitude of the steady-state displacement of the motor (in mm) Choose... the phase shift of the steady state displacement (in rad) is Choose... +
Piston (M=5kg) is driven when the fly wheel (r=0.1m, J=0.5kgm^2) moves the arm (L=0.2m,m=1kg). The stiffness k=100N/m come Fron compression of gas. What is the natural frequency of the system
A machine with a total mass of 2000 kg has a rotor with an out of balance force equivalent to 0.2 kg at 0.5 m radius rotating at 3000 rev/min. Calculate the stiffness and mass of an undamped vibration absorber which could be connected to the machine to eliminate transmission of force to the foundation at the operating speed, if the maximum deflection of the absorber spring is to be limited to 8 mm. [Ans 1234 kN/m, 12.5kg]
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Statement of question: A centrifugal pump having a mass of m1, having an unbalance of me, is supported on a rigid foundation of mass m2 through isolator springs of stiffness k1 as shown in Figure Q1. The centrifugal pump on a rigid foundation can be modeled for vibration analysis in the x direction as Two-degree-of-freedom system. The mass of the pump m, and the foundation, m2 can be approximated as 360 kg and 900 kg respectively. Whereas, the the soil stiffness k2 is 175 kN/m. The soil damping c1 is 35 kN.s/m. The mass m and eccentricity e of umbalence are 0.23 kg and and 0.15 m respectively. Discuss the system response for the pump speed of 1200 rpm using modal analysis for isolator spring stiffness of 300 kN, 350 kN and 400 kN. The total vertical component of the exciting force on the centrifugal pump is given by F(t) = mew² sin wt. F(t) = mew sin wt Centrifugal pump (mass, m1) m1 Isolator springs (stiffness, k1) Foundation m2 (mass, m2) k2 Soil (stiffness, k; damping, c2) A…
The door shown in the figure is equipped with a torsional spring of stiffness 25 Nm/rad and a torsional viscous damper c so that it automatically returns to its closed position after being opened. The door has a mass of 60 kg and a centroid moment of inertia about axis AB parallel to the door's axis (Oz) of 7.2 kgm^2. a. What is the damping coefficient such that the system is critically damped? b. What is the initial angular velocity of the door so that the door is opened 70 degrees? How long will the door return to 5 degrees of completely closing? c. Repeat a and b if the door is designed with a damping ratio of 1.3.
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6- Please I want solution of all sub-parts by typing. Many Thanks
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An air compressor weighs 4450 N and is operating at a constant angular speed of 1750 rev/min. The unbalanced reciprocating parts weight 110 N and the rotating parts are well balanced. The crank radius is 10 cm. If the dampers used for the mounting introduce a damping ratio of 0.15: 1- Specify the overall springs stiffness for the mounting such that only 20 % of the unbalanced force is transmitted to the foundation, and then 2- Determine the amplitude of the transmitted force.

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