A7.5. INSTANT CENTERS. Find and mark all of the instant centers for the mechanism shownbelow. Using the AVRT, find and report the magnitudes and directions for w, and thevelocity of point C. Assuming that Link 4 is the output link, report the MechanicalAdvantage for torque.input: w₂ = 1 rad/s cwlink 2 = 200 mm2g-

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Answered: A7.5. INSTANT CENTERS. Find and mark…

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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a steam engine runs at 150rpm. its turning moment diagram gave the areas in mm2 taken in order above and below the mean torque line is 500,250,270,390,190,340,270,250, the scale for turning moment is 1mm=500mnm, 1mm=5’ if the fluctuation of speed is not to exceed +or-1.5% of mean, determine a suitable diameter and cross-section of the rim of flywheel with axial dimension equal to 1.5times the radial dimension. the hoop stress is limited to 3mpa and the density of material of flywheel is 7500kg/m3.
An engine flywheel has a mass of 6.5 tones and the radius of gyration is 2 m. If the maximum and minimum speeds are 120 r. p. m. and 118 r. p. m. respectively, find maximum fluctuation of energy.
The turning moment diagram for a petrol engine is drawn to the following scales: turning moment 1 mm to 2·5 Nm; crank angle, 1 mm to 1°. The fluctuations of energy between the crank positions for minimum and maximum speeds corresponds to an area of 600 mm² of the turning moment diagram. The flywheel is made from cast iron, of density 7·2 tonnes/m3. Determine: (a) The greatest fluctuation of energy (b) The mass of the flywheel required to prevent the a fluctuation of speed greater than ± 0·5% from the mean speed of 1600 rev/min if the radius of gyration is 120 mm. (c) The dimensions of the flywheel (diameter and thickness) (d) Describe the possible consequences to the system if the flywheel was not used to limit the fluctuation of speed.
A1. A flat belt drive for speed reduction has pulley diameters of 200 mm and 380 mm. Themaximum belt tension is not to exceed 620 N and it is required to transmit 1·8 kW at anoutput speed of 360 rev/min. Determine:(a) The input torque. (b) The belt speed. (c) The limiting slack side tension. (d) The initial tension at which the belt should be set.
Find βW for the torque- angle diagram shown. The enclosed areas are , A1 = 400 J , A2 = 800 J , A3 = 550 J and A4 = 150 J Find the moment of inertia for a flywheel which will keep the speed within the range 410 to 416 rev/min. and find the mass of a suitable flywheel with a radius of gyration of 0.5 m.
Q3/ A vertical double acting steam engine develops 80 kW at 240 rpm. The maximum fluctuation of energy is 25% of the work done per stroke. The maximum and minimum speeds are not to vary more than +1% of the mean speed. Find the mass of the flywheel, if the radius of gyration is 0.65 m.
A load is raised 11 ft by the gears and wheel system below. Gear A is initially rotating at rest and accelerates uniformly to omega = 24 rpm in t= 10 sec and maintain then maintain this constant 24 rpm speed. The dimensions are rA= 1 in, rB= 9 in and rC=16 in. 1) From 0 to 10 sec, find alphaA1, alphaC1 in rad/s^2, omegaA1(t), omegaC1(t) in rad/s, thetaA1(t), thetaB1(t) and thetaC1(t) in rad, and the distance made by the load s1 in inches and in feet made by the load during this time. 2) After 10 sec, find the distance s2 in feet and in NC es needed to reach the 11 ft, find thetaC2(t), alphaA2, alphaB2 in rad/s^2, omegaA2(t), omegaB2(t) in rad/s, thetaA2(t), in rad and the distance s2 in ft that should be made to get to the 11 ft raising distance of the load. 3) Deduce the number of revolutions made by gear A and how long it will take, to raise the load up to 11 ft. In the box below, give the time it takes to raise the load in seconds, with one decimal.
A load is raised 11 ft by the gears and wheel system below. Gear A is initially rotating at rest and accelerates uniformly to omega = 24 rpm in t= 10 sec and maintain then maintain this constant 24 rpm speed. The dimensions are rA= 1 in, rB= 9 in and rC=16 in. 1) From 0 to 10 sec, find alphaA1, alphaC1 in rad/s^2, omegaA1(t), omegaC1(t) in rad/s, thetaA1(t), thetaB1(t) and thetaC1(t) in rad, and the distance made by the load s1 in inches and in feet made by the load during this time.
The transmission ratio of a worm drive is i= 20, number of worm gear teeth Z, = 40,modulus m = 4mm,worm indexing circle diameter d, = 44mm. Find: (1) Characteristic coefficient of worm q ; (2) Worm gear helix angle B ; (3) Center distance a; (4) Meshing efficiency of worm drive 7 (p, = 1°16 )
Determine the vertical displacement of point C. EI is constant. Use the method of virtual work. Solve Prob. 9–55 using Castigliano’s theorem.
A flywheel is fitted to a multi cylinder engine, which runs at a mean speed of 360 r.p.m. If the speed varies from 6 % above the mean to 2 % below it and the fluctuation energy is 1200 kN-cm, If the radius of gyration is 20 cm, find (i) mass moment of inertia of the wheel and (ii) mass of flywheel. The mass moment of Inertia in Kgm2 is Mass of the flywheel in kg is
The turning-moment diagram for one cycle of a multi-cylinder engine shows fluctuations in energy above and below the mean-torque line as follows: –62·5 J, +105·7 J, –27·3 J, +63·3 J, –59·1 J, +25·2 J, –99·3 J and +54 J. Sketch the diagram and use it to find the mass of the flywheel, radius of gyration 220 mm, needed to keep the engine speed within the range 898 to 902 rev/min

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