Indicate the differences between the rigid rotor and elastic rotor models, between the frequency of two adjacent lines.
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Indicate the differences between the rigid rotor and elastic rotor models, between the frequency of two adjacent lines.
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- In the rigid rotor and elastic rotor models, comment on the differences between the expressions corresponding to the frequencies of the first 5 rotation levels.Suppose we have determined that the lowest natural frequency of a particular helical compression spring is 20286 rpm. According to the prescription in our book and according to the presentation in class, find the highest recommended operating frequency of a machine that utilizes this spring. Give your answer in rpm, but do not include units--Blackboard will not understandTwo identical 2000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz, What is the maximum load that can be delivered without overloading either machine?
- Q5.A 50 HZ, 4-poles star connected induction motor has a slip=0.04 & Pout=20hp find: (1).Synchronous speed in r.p.m.(ns) 2)rotor speed in r.p.m(n;) 3). Rotor frequency (f:). 4Loud torque, 5) Rotor frequency Note: 1hp=746wattIn a no-load motor, a constant electromagnetic torque of 5 Nm is generated at t = 0. The engine reached 1800 revs in 4 seconds. Calculate motor inertia ignoring friction.A horizontal split case pump with a single impeller shows a predominant vibration reading at a frequency of 1x the rotational speed of the pump and a lower vibration at a frequency of 2x the rotational speed. The impeller is centrally located between two bearing housings. There is a phase difference of 180º between the axial readings and the radial (horizontal) readings taken at the bearing housings. What do you suspect the cause of the high vibration is?
- Your centrifuge rotor diameter is 40cm. Calculate the rcf for 1500 rpm, 5753 rpm, 654 rpm. Which type of rotor was used for this centrifugation?Given the information for a motor, determine its LCC in term of present worth (in $). Annual discount rate (i.e. interest rate): 10% Life time: 5 years Initial cost: $6500 Energy usage: $500/year Maintenance cost: $400/year Salvage value: $500 A 9601 B 11471 с 11068 D 12170 E 10625Piston (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
- hand written plz Q4(a) A 30 kW cooler machine runs at a speed of 4000 RPM One of the bearings is suspected with severe damage due to the high vibration. The bearing specifications: bearing diameter is 66 mm, ball diameter is 4 mm, number of balls is 15, and contact angle is 1 degree. Determine the following: (i) Ball passing frequency inner race; Ball passing frequency outer race; Ball passing frequency cage race: Bad misalignment. (iii) (iv)Write the units of coefficient of viscous damping force.Select a suitable Vbelt drive for a flour mill transmitting power from a motor of 10 kW rotating at 1,440 rpm using suitable charts. The mill rotates at 400 rpm for a service of 22hrs per day and is to be arranged in minimum space with center distance of 0.5m. Assume that the pitch diameter of small pulley is 100mm.