Theory of Machines : Flywheels

FLYWHEEL

• A flywheel acts as an energy reservoir, which stores energy during the period when the supply of energy is more than the requirement and releases energy during the period when the requirement is more than the supply.
• In case a variable torque is supplied where demand is a constant torque or demand is variable torque whereas constant torque is supplied. In both these cases there is mismatch between the supply and demand. This results in speed variation.

4.1 FLUCTUATION OF ENERGY

• The fluctuation of energy may be determined by the turning moment diagram for one complete cycle of operation. The variations of energy above and below the mean resisting torque line are called fluctuations of energy.         

• The difference between the greatest speed and the least speed is known as the maximum fluctuation of speed and the ratio of the maximum fluctuation of speed to mean speed is define as the coefficient of fluctuation of speed.

        Maximum fluctuation of speed = N_max -N_min

• The difference between the maximum and minimum kinetic engines of the flywheel is known as the maximum fluctuation of energy.

4.2. REQUIREMENT OF FLYWHEEL IN POWER PRESSES

•   when the load on the crankshaft is constant or varies and the input torque varies continuously during a cycle, a flywheel is used to reduce the fluctuations of speed.
• A flywheel can perform the same purpose in a punching press or a riveting machine in which the torque available is constant but the load varies during the cycle.

4.3 DESIGNING OF FLYWHEEL RIM

       Below we are studying Rim (Ring shaped) type flywheel, which is practical not usable.

       Let, A → cross section area of the rim

                                                                Fig.3: Rim type Flywheel                         Fig.4: Cross-section of flywheel

You can avail of BYJU’S Exam Prep Online classroom program for all AE & JE Exams:

BYJU’S Exam Prep Online Classroom Program for AE & JE Exams (12+ Structured LIVE Courses)

You can avail of BYJU’S Exam Prep Test series specially designed for all AE & JE Exams:

BYJU’S Exam Prep Test Series AE & JE Get Unlimited Access to all (160+ Mock Tests)

Thanks

Team BYJU’S Exam Prep

Download  BYJU’S Exam Prep APP, for the best Exam Preparation, Free Mock tests, Live Classes.