TURNING MOMENT DIAGRAMS AND FLYWHEELIntroductionAfywheelisnothingbutarotatingmasswhichis usedasanenergyreservoirinamachinewhich absorbstheenergywhenthespeedinmoreand releasestheenergywhenthespeedisless,thus maintainingthefuctuationofspeedwithin prescribed limits. The kinetic energy of a rotating body is given as I2, fthespeedshoulddecrease!energywillbegiven upbythefywheel,and,conversely,ifthespeed shouldincreaseenergywillbestoredupinthe fywheel.Therearetwotypesofmachineswhich bene"tfromtheactionofafywheel.The "rsttypeisapunchpress,wherethe punchingoperationisintermittent#nergy isre$uiredinspurtsandthenonlyduring the actual punching operation.Thesecondtypeisasteamengineoran internal combustion engine, where energy issuppliedtothemachineatanon%uniformrateandwithdrawnfromthe engine at nearly a constant rate.Crank efort diagram or T!ring moment diagram"tisthegraphicalrepresentationofturningmomentor crank e&ort for the various positions of the crank. The T' is plotted on (y) a*is and crank angle on (*) a*is.Ue o# t!rning moment Diagram+,Theareaundertheturningmomentdiagramrepresents workdonepercycle.Theareamultipliedbynumberof cycles per second gives the power developed by the engine.2, -y dividing the area of the turning moment diagram with thelengthofthebasewegetthemeanturningmoment. This enables us the "nd the fuctuation of energy.., The ma*. ordinate of the turning moment diagram gives the ma*imum tor$ue to which the crank shaft is sub/ected. This enables us the "nd diameter of the crank shaft.TMD #or a #o!r troke I$C$ EngineF%!&t!ation o# energ' 0et the energy in the fy wheel at A 1 E #nergy at B 1 E 2 a1 #nergy at C 1 E 2 a1 3 a2 #nergy at D 1 E 2 a1 3 a2 2 a3 #nergy at E 1 E 2 a1 3 a2 2 a3 3 a4 #nergy at F 1 E 2 a1 3 a2 2 a3 3 a4 2 a5 #nergy at G 1 E 2 a1 3 a2 2 a3 3 a4 2 a5 3 a6 4uppose greatest of these energies is at - and least at #, 'a*imum fuctuation of energy 56#, 1 ma*. energy 7 min. energy