The winding drum of mass 300kg has an effective diameter of 950 mm and radius of gyration of 650 mm. The drum is driven by a motor whose efficiency is 80% through a gear reduction of 20:1. Determine; 1). Motor torque when the load is accelerated at 4 m/s^2. 2). The maximum uniform speed of the rope, if the maximum power output of the motor is 18 KW.

The winding drum of mass 300kg has an effective diameter of 950 mm and radius of gyration of 650 mm. The drum is driven by a motor whose efficiency is 80% through a gear reduction of 20:1. Determine; 1). Motor torque when the load is accelerated at 4 m/s^2. 2). The maximum uniform speed of the rope, if the maximum power output of the motor is 18 KW.

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

See similar textbooks

Similar questions

RPM. The shaft is made of steel with E = 220 GPa. The diameter of the shaft 135 mm and the Calculate the distance a of the shaft in the assembly so that the critical speed is above 15000 mass ma = 100 kg. Assume the density of the material of the shaft is p = 7850 kg/m³ and include the self-weight of shaft in calculations. Use Dunkerley's method. 2ma ma d a + A a B
A shaft having length equal to 10 m and diameter equal to (50+ 01) mm is simply supported at both ends. The shatt carries four masses (150 + 01) kg, (200 + 01) kg, (250 +01) kg and (300 + 01) kg. These masses are located at a distance of 1.5m, 2.5 m, 5.5 mand 7.5 m from the left hand side support, respectively. The modulus of elasticity, E, for the material of the shaft is 200 GN/m? and mass density for the shaft material is 7500 kg/m?3. Determine critical speed of the shaft in revolutions per minute for the following two cases: 1. Effect of the mass of the shaft is neglected. 2. Effect of the mass of the shaft is considered. What is the usefulness of the answers determined in this problem?
The motor on the left provides a torque of 5500 N•m to the gear shaft shown. The motor runs machines connected to gears B, C and D requiring torques of 3000 N•m, 1500 N•m and 1000 N•m respectively. A, B, C and D are spaced 2000 mm apart and the diameter of the shaft is 75 mm. The shear modulus of the shaft material is 80x109 N/m2. Determine: Minimum diameter required (in millimeters) if the shearing stress in the shaft is limited to 100x106 N/m2 Rotation of D with respect to A Note: Draw the Free Body Diagram, Compute for all of the necessary elements, Include the units/dimensions, use the proper formula and round-off all the answers and final answers to 3 decimal places.
Problem 2. A 300-mm diameter solid disk is to be used as a flywheel in a machine to reduce speed fluctuations. If the disk material has yield strength S Y =720 MPa, density p=7000 kg/m^ 3 . and Poisson's ratio J = 0.2 ^ c , find the maximum allowable rotational speed (in rpm) for a safety factor of 1. a) Solve using the MSST. b) Solve assuming that the disk is mad of cast iron having Sut = 207MPa , Fuc = 780MPa, p = 7000 kg/m³, and Poisson's ratio v r = 0.26 , Use Coulomb-Mohr theory.
The variation diagram of the cutting force of the cutting work done with the press shown in the figure is given in the figure. Engine speed is 1400 rpm, flywheel speed is 75 rpm. The moment of inertia of the rotating masses in the engine is 0.75 kgm^2. Calculate the flywheel moment of inertia required for the press so that the velocity unevenness is 0.02. It is known that the engine power is 2 kW.
A compound shaft drives several pulleys, as shown. Segments (1) and (2) of the compound shaft are hollow aluminum (G = 4000 ksi) shafts that have a polar moment of inertia of J = 2.835 in4. Segments (3) and (4) are solid steel (G = 12000 ksi) shafts that have polar moment inertia of J = 1.024 in4. The bearings shown allow the shaft to turn freely. Assume TB = 980 lb.ft TD= 525 lb.ft TE = 130lb.ft L1 =74in L2 =29in L3 =34in L4 =35in. Calculate the rotation angle (including the correct sign) of pulley E with respect to point A.
2. Two shafts, one solid the other one hollow, are connected end to end by means of a coupling in which there are 8 screws on the pitch diameter D = 250 mm. The solid shaft has diameter d = 50 mm and transfers the power P = 500 kW at 75 rev/s. The external diameter of the hollow shaft is dex = 75 mm. %3D Note: All parts of the system must be equally strong, and able to transfer the required power Calculate: (a) The internal diameter d; of the hollow shaft (b) The diameter of the bolts d, connecting the two shafts (c) If the hollow shaft has to be replaced by a rectangular hollow cross-section with outer dimensions b xh and uniform wall thickness of 4 mm. Calculate the values b, h while following the request to keep h = 2b
1. The endurance limit for rotating shaft, if its ultimate strength Su=1600 Mpa is:
In the figure below, a motor with power 150kw and speed of 2500 rpm is connected to shaft 1(by coupling) in a clockwise direction. Shaft 2 is connected to shaft 1 by gears 1 and 2. If 30% of the power is consumed by the gear3 and 9% by the pulley and 61% by the sprocket, draw torque diagrams for both shafts. • Lengths: AB=90mm/BC=GH=50mm/CD3HI=60mm/DE=IJ=80mm 13 Gear3 E Gear2 14 15 16 Motor shafth 2. 17 Bearing Shaft1 Gear1 sprocket
Design machine
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? dont write handwritten solution.