ENGINEERING MECHANICAL-ENGINEERINGThe winding drum of mass 300kg has aneffective diameter of 950 mm and radius ofgyration of 650 mm. The drum is driven bya motor whose efficiency is 80% through agear reduction of 20:1.Determine;1). Motor torque when the load isaccelerated at 4 m/s^2.2). The maximum uniform speed of therope, if the maximum power output of themotor is 18 KW.

1:First, let's solve for the motor torque when the load is accelerated at 4 m/s The torque needed to…

Answered: ENGINEERING MECHANICAL-ENGINEERING The…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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4 A compressor requires 120 kW to run at 240 rpm from an electric motor of speed 750 rpm by means of a V-belt drivę. The diaincter of comp shaft pulley should not be more than 1000 mm while the center distance between the shafts is 2000 mm. Belt speed should not be more than 25 m/sec. Detcrmine number of belts to transmit the power it each belt has cross-sectional arca of 375 mm', density 1000 kg/m' and allowable tensile stress of 2.5 MPa. The pulley groove angle is 40° and coeff, of friction between pulley and belt is 0.25:
the figure shows a motor driving a two-output transmission system. The blower requires a certain amount of force to operate since the drum rotates at an angular acceleration of 0.03 rad/s2. Determine the torque produced by a motor with a torque of 700 Nm and a speed of 1,600 rpm. following:- The power produced at the drum (P). The torque requirement for the blower to operate (Tblower) and power generation (Pblower) The overall efficiency transmission of the gear system, hO. If the speed of motor is NOT given, explain without calculation how the overall efficiency transmission of the gear system can be obtained. Given:- Number of gear teeth, t:- t1=40 ; t2=200 ; t3=50 ; t4=200 ; t5=40 ; t6=120 ; t7=60 and t8=120 Equivalent mass moment of inertia, Ieq:- Imotor,5=25 kgm2 ; I23=10 kgm2 ; Iblower,4=15 kgm2 ; I67=20 kgm2 and Idrum,8=60 kgm2 Friction torque in bearing, Fb:- A=F=25 Nm ; I=J =20 Nm ; B=C=G=H=5 Nm and D=E=10 Nm Efficiency of all gear mesh, ⴄ=85%
a) An engine has a flywheel mass of 8-tonnes and a turning radius of 3 m. The energy fluctuation is 70 KN-m. The average speed of the engine is 160 rpm. Find the maximum speed value. b) A jet engine has a rotor with a weight of 500 N and this rotor rotates at 2400 rpm. Rotor It is suspended in the middle of the C and D bearings with a total distance of 600 mm between them and the center of gravity is rotated. 35 mm above its centre. By calculating the dynamic forces on the bearings, this system perform the balancing.
Q 16- Find the length of a belt necessary to drive a pulley of 80 cm diameter running parallel at a distance of 12 m from the driving pulley of 480 cm diameter ?
A 25-hp. 1750-rpm electric motor drives a machine through a multiple V-belt. The size 5V belts has unit weight of 0.012 lbf/in.) The pulley on the motor shaft has a 3.7-in. pitch diameter and geometry is such that the angle of wrap, o is 165º. k is consenvatively assumed that the maximum belt tension (F1) should be limited to 150 lbf, and that the coefficient of friction will be at least 0.512. [Hints: Use equations 17.18, 17.21, (h)]
An unbalanced small motor with me-1.2 kg.m is directly bolted to a machine with a mass of 500 kg. The machine is attached to the floor using an isolator with k=75000 N/m, e=1850 Ns/m (Weight of the motor is neglected.) a) Determine that how much percent of the force is transmitted to the floor if motor turns with n-250 rpm. b) Determine the rotation speed of the motor corresponding to the damped natural frequency of the system. e) Determine the vibration displacement amplitude at the speed calculated in part b).
A 7,5 kW electric motor (star-delta start) running at the speed of 900 r/min is to drive a laundry machine, which operates 12 hours per day, by means of a simplex chain drive. The laundry machine must run at approximately speed of 308 r/min. Based on the space restrictions, the center-line distance is limited to 400 mm. Specify the length of chain (in mm) to be used as well as the exact center-line distance. Note that the form of lubrication used is TPYE 2.
3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side. b T T, B d shaft Dimensions are as follows: da 200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm dB dahaft a We analyzed a problem similar to this on Test 01 using static failure theories. Is this strictly correct? Because the shaft is spinning, would not a material particle see a time-varying reversal of the the bending stress as in the R.R. rotating beam test? Would a particle see a reversal of the torsional shear stress? Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress concentrations. Ignore direct shear stress (that due to V). Find the safety factors with respect to fatigue and yielding. Be guided by section 6-14 on combined loading.
the torque-velocity (T/(w)) relations of the two machines with their shafts clamped together at constant voltage; T1(w)=a1-b1w a1=150Nm b1=1Nm . s/rad T2(w)=a2-b2w a2=270Nm b2=2Nm . s/rad friction will be neglected and there is also no load. question= Find the idle speed of the motors alone (not clamped).?
A motor drive has three different loads, first is rotational motion and coupled directly to the motor with the torque of 3 Nm. Second a rotational load is connected to the first load through a reduction gear with the ratio of 1:4. This load has a moment of inertia of 12 kg.m² and torque of 8 Nm. The third load is connected to the second rotational load that has a translational motion and consists of 1250 kg weight to be lifted up at a uniform speed of 115 meter per-minutes. The gear and translational system have efficiency of 85% and 90%, respectively. At this condition, the motor has an inertia of 0.3 kg.m² runs at a constant speed of 1350 rpm. If the transmission losses are neglected, (i) draw and label the block diagram to represent the drive system. (ii) calculate the equivalent inertia referred to the motor shaft. (iii) determine the total developed torque from the motor. (iv) examine the developed power from the motor.
8. A Hooke's joint connects two shafts whose axes intersect at 150°. The driving shaft rotates uni- formly at 120 r.p.m. The driven shaft operates against a steady torque of 150 N-m and carries a flywheel whose mass is 45 kg and radius of gyration 150 mm. Find the maximum torque which will be exerted by the driving shaft. [Ans. 187 N-m] mum
-8 Q2: A shaft is driven by a motor which exerts a constant torque while the load taken off the shaft fluctuates from zero to maximum during each revolution. If the maximum fluctuating in energy in one cycle is AE=242 N.m. Find the moment of inertia of the flywheel (I) to be mounted on the shaft so that the speed fluctuating shall not be more than 3 r.p.m. above or below a .mean speed of N=200 r.p.m

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