The various forces acts on the reciprocating parts of an engine.
The resultant of all the forces acting on the body of the engine due to inertia forces only is known as unbalanced force or shaking force.
Unit 5- balancing of reciprocating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
The various forces acts on the reciprocating parts of an engine.
The resultant of all the forces acting on the body of the engine due to inertia forces only is known as unbalanced force or shaking force.
Unit 5- balancing of reciprocating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Inertia effect of crank and connecting rod
single cylinder engine
balancing in multi cylinder-inline engine
– primary & Secondary forces
V-type engine
Radial engine – Direct and reverse crank method
Static balance occurs when the center of gravity of an object is on the axis of rotation. This allows the object to remain stationary, with the axis horizontal, without the application of any braking force. Static balance does not tend to rotate due to the force of gravity.
Static Balance is when the weight of the wheel and tire assembly is distributed equally around the axis of the wheel rotation. If static Balance exists the wheel will not tend to rotate.
Dynamic balancing definition: “Dynamic balancing is a way of balancing machines by rotating parts quickly and measuring the imbalance using electronic equipment. The imbalance measured can then be corrected by adding or subtracting weight from the rotating parts until the vibration is reduced.”
Inertia effect of crank and connecting rod
single cylinder engine
balancing in multi cylinder-inline engine
– primary & Secondary forces
V-type engine
Radial engine – Direct and reverse crank method
Static balance occurs when the center of gravity of an object is on the axis of rotation. This allows the object to remain stationary, with the axis horizontal, without the application of any braking force. Static balance does not tend to rotate due to the force of gravity.
Static Balance is when the weight of the wheel and tire assembly is distributed equally around the axis of the wheel rotation. If static Balance exists the wheel will not tend to rotate.
Dynamic balancing definition: “Dynamic balancing is a way of balancing machines by rotating parts quickly and measuring the imbalance using electronic equipment. The imbalance measured can then be corrected by adding or subtracting weight from the rotating parts until the vibration is reduced.”
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10. know that centrifugal force due to mass B,
horizontal component of this force acting in opposite direction of primary
force
The primary force is balanced
11. compromise let a fraction ‘c’ of the reciprocating masses is balanced
Unbalanced force along the line of stroke
12. and unbalanced force along the perpendicular to the line of stroke
Resultant unbalanced force at any instant
13. If the balancing mass is required to balance the revolving masses as
well as reciprocating masses
Example 2.1. A single cylinder reciprocating engine has speed 240
r.p.m., stroke 300 mm, mass of reciprocating parts 50 kg, mass of
revolving parts at 150 mm radius 37 kg. If two-third of the reciprocating
parts and all the revolving parts are to be balanced, find: 1. the balance
mass required at a radius of 400 mm, and 2. the residual unbalanced
force when the crank has rotated 60° from top dead center.
19. Example 2.2. A four cylinder engine has cranks arranged symmetrically
along the shaft as shown in Fig. 2.2. The distance between the outer cranks
A and D is 5.4 meters and that between the inner cranks B and C is 2.4
meters.
The mass of the reciprocating parts belonging to each of the outer
cylinders is 2 tones, and that belonging to each of the inner cylinders is m
tones. If the primary and secondary forces are to be balanced and also the
primary couples, determine the crank angle positions and the mass of the
reciprocating parts (m) corresponding to the inner cylinders.