Experiment 5: MOMENT OF INERTIA OF FLYWHEEL

 

ABSTRACT:

In this experiment, the moment of inertia of flywheel is being studied by variating the point of mass of flywheel. The experiment is conducted by recording the time taken for the respective point of mass to being rotated by a fixed load until the point where the load is escaping from the flywheel and the number of rotations done after be independent from the load. The moment of inertia then is calculated by substituting the data obtained from the experiment and the experimental value is calculate and compared to the experimental one

INTRODUCTION:

The mass moment of inertia is an important concept in rotational motion. The mass moment of inertia also called as the rotational inertia of a body is a measure of how hard it is to get it rotating about some axis. Rotational inertia is one indicator of the ability of rotating body to store kinetic energy. It is also an indicator of the amount of torque that will be needed to rotational accelerate the body. Just as the mass is a measure of resistance of linear acceleration, moment of inertia is a measure of resistance to angular acceleration.

Flywheel is a solid disc of significant size and weight mounted on the shaft of machines such as steam engines, diesel engines, turbine etc. Its function is to minimize the speed fluctuations that takes place when load on such machines suddenly decreases or increases. The flywheel acquires excess kinetic energy from the machines when load on the machine is less or its running idle and supplies the stored energy to the machine when it is subjected to larger loads. The capacity of storing / shedding of kinetic energy depend on the rotational inertia of the flywheel. This rotational inertia is known as moment of inertia of rotating object namely wheels.

Formulation and calculation:

Work output from fallen mass is given by the difference between lost in potential and kinetics energy during mass separation from energy wheel.

Energy wheel starts from static condition. It will reach a total of N₁ rotation before  stopping, when it is allowed to rotate after body separation. This means that all work was used to overcome the bearing friction which is assumed to be constant. At the time the load separates from the energy wheel, it will reach the maximum angle speed _N and the kinetics energy is given by

Let say torsion of bearing friction is Cf. By assuming the work used to overcome the friction is equal to the output work, hence

OBJECTIVES:

1. To compare the theoretical and experimental value of moment of inertia for flywheel.

2. To investigate the variations in moment of flywheel with different detachable parts.

RESULT AND DISCUSSION:

PART 1: A COMPLETE FLYWHEEL WITH OUTER AND INNER RINGS

PART 2: A COMPLETE FLYWHEEL WITH INNER RING ONLY 

PART 3: A COMPLETE FLYHEEL WITHOUT OUTER AND INNER RINGS

PART 4: A COMPLETE FLYWHEEL WITH OUTER RING ONLY