Example 11-10: Torque on unbalanced system. Determine the magnitude of the net net torque T needed to keep the illustrated system turning. MA Z LA Bearing ار 13 Axle L = LA + LB FB MB LB. Bearing
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- The equation of the turning moment diagram for the three crank engine is given by: T(N.m) =25000 - 7500 sin 3theta where θ radians is the crank angle from inner dead cen?tre. The moment of inertia of the flywheel is 400 kg-m2 and the mean engine speed is 300 r.p.m. Calculate the power of the engine and the total percentage fluctuation of speed of the flywheel, if 1. The resisting torque is constant, and 2. The resisting torque is (25 000 + 3600 sin θ ) N-m.The turning moment diagram for a multi cylinder engine has been drawn toa scale of 1 mm = 4500 N -m vertically and 1 mm = 2. 4 ͦ horizontally. Theintercepted areas between output torque curve and mean resistance lineabove and below the mean taken in order from one end are 342, 23, 245,303, 115, 232, 227, 164 ??2, when the engine is running at 150 rpm. Ifthe mass of the flywheel is 1000 kg and the total fluctuation of speed doesnot exceed 3% of the mean speed, find the minimum value of the radius ofgyration.The equation of the turning moment diagram for the three crank engine is given by:where θ radians is the crank angle from inner dead cen?tre. The moment of inertia of the flywheel is 400 kg-m2 and the mean engine speed is 300 r.p.m. Calculate the power of the engine and the total percentage fluctuation of speed of the flywheel, if 1. The resisting torque is constant, and 2. The resisting torque is (25 000 + 3600 sin θ ) N-m.
- 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.Solve for Problem 2, when RN1 = 0145A belt conveyor transports 18 tonnes per hr at 20°. Determine the speed reducer power factor to lift the load vertically up sufficient to give 33.5 m horizontal center-to-center pulley distance. 1750-rpm motor, plain chain drive to helical gear speed reducer. Belt speed, 61 m/min. Discharge over tail pulley. No tripper.
- An engine develops 200 kW of power at a mean speed of 75 rpm. The coefficient of energy fluctuation is 0.15 and speed fluctuates within ±3% of the mean speed. Find the moment of inertia of the flywheel that must attached to the crankshaft of the engine in order to maintain the speedwithin the acceptable range.Calculate the SKF rating life at 95% reliability for the following thrust ball bearing and conditions. Fa: 5.17 kNn: 1497 rpmBearing 51110Clearance NormalaSKF: 1 Give the answer in hours.pleassssse solve question 8, statics
- The turning moment diagram for a multicylinder engine has been drawn to a scale of 1 mm = 4550 N-m vertically and 1 mm = 2.5° horizontally. The intercepted areas between output torque curve and mean resistance line taken in order from one end are 340, -24, 245, -305, 120,-232, 228, -165 mm2, when the engine is running at 180 r.p.m. If the mass of the flywheel is 1100 kg and the total fluctuation of speed does not exceed 4% of the mean speed, find the minimum value of the radius of gyration.A steel shaft 800 mm long transmitting 15 kW at 400 r.p.m. is supported at two bearings at the twoends. A gear wheel having 80 teeth and 500 mm pitch circle diameter is mounted at 200 mm from theleft hand side bearing and receives power from a pinion meshing with it. The axis of pinion and gearlie in the horizontal plane. A pulley of 300 mm diameter is mounted at 200 mm from right hand sidebearing and is used for transmitting power by a belt. The belt drive is inclined at 30° to the vertical inthe forward direction. The belt lap angle is 180 degrees. The coefficient of friction between belt andpulley is 0.3. Design and sketch the arrangement of the shaft assuming the values of safe stresses as :τ = 55 MPa; σt= 80 MPa. Take torsion and bending factor 1.5 and 2 respectively.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%