A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left- hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: 1- The dynamic forces are. 2- Forces on bearings A and B due to dead weight are . 3- Resultant force at A and B are.. . and ... 4- A rotor supported at A and B carries two masses. The rotor is . (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. 5- The static balancing is satisfactory for low-speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the.. , and. , and

A shaft rotating at 120 r.p.m is supported in bearing A and B, 1.8 m apart, A being at the left- hand end. Two unbalanced rotating masses of 7.5 kg and 10 kg at radii of 75 mm and 50 mm respectively are situated between A and B at distances of 0.6 m and 0.9 m respectively from A. The angle between the radii is 60° when viewed along the shaft. Answer the following questions: 1- The dynamic forces are. 2- Forces on bearings A and B due to dead weight are . 3- Resultant force at A and B are.. . and ... 4- A rotor supported at A and B carries two masses. The rotor is . (a) dynamically balanced (b) statically balanced (c) both (a)&(b) (d) none. 5- The static balancing is satisfactory for low-speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the.. , and. , and

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter8: Centroids And Distributed Loads

Section: Chapter Questions

Problem 8.95P

See similar textbooks

Similar questions

The homogeneous 240-lb bar is supported by a rough horizontal surface at A, a smooth vertical surface at B, and the cable BC. Draw the FBD of the bar and count the unknowns.
Locate the instant center of rotation of bar AB for each case shown.
The 400-kg drum is held by tongs of negligible mass. Determine the magnitude of the contact force between the drum and the tongs at D.
Four masses 150 kg, 200 kg, 100 kg and 250 kg are attached to a shaft revolving radii 150 mm, 200 mm, 100 mm and 250 mm; in planes A, B, C and D respectively. The planes B, C and D are at distance 350 mm, 500 mm and 800 mm from plane A. The masses in plane B, C and D are at an angle 150°, 200° and 300° measured anticlockwise from mass in plane A. It is required to balance the system by placing the balancing masses in planes P and Q which are midway between the planes A and B, and between C and D respectively. If the balancing masses revolve at radius 180 mm, find the magnitude and angular position of the balance masses.
A shaft carries four masses A, B, C and D of magnitude 10 kg, 20 kg, 15 kg and 25 kg respectively and revolving at radii 100 mm, 50 mm, 80 mm and 120mm in planes measured from A at 100 mm, 300 mm and 500 mm. The angles between the cranks measured anticlockwise are A to B = 40°, B to C = 50° and C to D = 150°. The balancing masses are to be placed in planes X and Y. The distance between the planes A and X is 50 mm, between X and Y is 350 mm. If the balancing masses revolve at a radius of 50 mm, find the magnitude for mass on plane X (consider plane X as the refernce plane).
the set of four rollers shown has fixed axles and tranfers rotation from each roller to the next without slipping. Their diameters are 21cm, 32cm, 50cm and 14cm respectively
A shaft carries four masses A, B, C and D with a a magnitude of 200kg, 300kg, 400 kg and 200 kg respectively and revolving at radii 80mm, 70mm, 60mm and 80mm in planes measured from A at 300mm, 400mm and 700mm. The angles between the cranks measured counter clockwise are A to B 450, B to C 700 and C o D 1200. The balancing masses are to be placed in planes X and Y. Distance between planes A and X is 100mm, between X and Y is 400mm and between Y and D is 200mm. If the balancing masses revolve at radius of 100mm find their magnitude and angular position
The cranks and connecting rods of a four cylinder in-line engine running at 2000 rpm are 60mm and 240mm each respectively. The cylinders are spaced 150 mm apart. If the cylinders are numbered 1 to 4 in sequence from one end, the cranks appear at intervals of 90º in an end view in the order 1-4-2-3.The reciprocating mass for each cylinder is 15 kg. Determine (i) unbalanced primary and secondary forces, (ii) unbalanced primary and secondary couples with reference to central plane of the engine
A caravan weighs 28 kN. It has a wheel base of 2 m, track width 1m and height ofC.G. 300 mm above the ground level and lies midway between the front andrear axle. The engine flywheel rotates at 2950 rpm clockwise when viewed from thefront. The moment of inertia of the flywheel is 4 kg-m 2 and moment of inertia ofeach wheel is 3 kg-m 2 . Find the reactions between the wheels and the ground whenthe car takes a curve of 15 m radius towards right at 30 km/h, taking intoconsideration the gyroscopic and the centrifugal effects. Each wheel radius is 400 mm.
In the multi-rotor system shown below, m1=2 kg, m2=5 kg, r1=36 mm, r2=65 mm, z1=119 mm, z2=414 mm, θ1=118o, θ2=252o. We have 2 kg masses to balance the multi-rotor shaft. Answer questions a, b, c, and d accordingly. 1/ Determine the radius at which the 2 kg mass will be placed on the R plane (mm). a.35,763 b.268,220 c.53,644 D.107,288 2/Determine the angle (degrees) at which the 2 kg mass will be placed on the R plane. a.69,256 b.83,107 c.90,033 D.55,405 3/ Determine the radius at which the 2 kg mass will be placed on the L plane (mm). a.105,006 b.12,251 c.36,752 D.18,376 4/Determine the angle (degrees) at which the 2 kg mass will be placed on the L plane. a.30,085 b.37,607 c.43,248 D.45,128 solve the question by using the rules of Machine Dynamics
A shaft with 3 meters span between two bearings carries two masses of 10 kg and 20 kg acting at the extremities of the arms 0.45 m and 0.6 m long respectively. The planes in which these masses rotate are 1.2 m and 2.4 m respectively from the left end bearing supporting the shaft. The angle between the arms is 60°. The speed of rotation of the shaft is 200 r.p.m. If the masses are balanced by two counter-masses rotating with the shaft acting at radii of 0.3 m and placed at 0.3 m from each bearing centers, estimate the magnitude of the two balance masses and their orientation with respect to the X-axis, i.e. mass of 10 kg ‎‏Note: It must be solved using the graphic method, not the equations method.
The tractor shovel shown ,carries a 530 kg load that has its center of mass at HH. The shovel’s dimensions are: a = 51.0 mm, b = 204 mm, c = 306 mm, d = 102 mm, and e = 357 mm. Find the reaction force at E(Ex and Ey). Assume that the positive direction of the x and y axes is to the right and upward, respectively.