Coupled Systems

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Alun1986 Participant Join Date: Jun 2008 Posts: 3	Coupled Systems 06/17/2008 10:44 AM
	A croppign wheel is cutting flat steel bar 50mm wide by 25mm thick: the work required to crop each piece of bar is 7500J. The flywheel has a radius of gyration 950mm, has a speed of 140 rev min-1 at the start of each cut. Assuming the energy for cutting is entirely supplied by the flywheel and that its speed is reduced by 15% during cutting, determine: a) The mass of the flywheel b) The torque that must be applied to the flywheel so that is regains its full speed in 3 seconds Please can someone provide me with equations, help guidance. Thanks!
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Hendrik Guru Join Date: Jan 2007 Location: Centurion, South Africa Posts: 3921 Good Answers: 97	#1 Re: Coupled systems 06/17/2008 2:30 PM
	A flywheel with a on the fly detachable prime driver only occurs in homework. (are you a student or the lecturer?) Here is some good advice. Read pages 1 to 87 of your handbook. If you are not dead by then read the rest of the book as well. Go through your notes (or the notes of the good example in your group) a similar problem. Sit down, read the question and complete the task (One step at a time). __________________ Never do today what you can put of until tomorrow - Student motto
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Alun1986 Participant Join Date: Jun 2008 Posts: 3	#2 In reply to #1 Re: Coupled systems 06/18/2008 2:42 AM
	I am a student, but unfortunately i have no notes covering this. Do you know of any good books that i could use to help? Thanks for your help. Alun
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#3 In reply to #2 Re: Coupled systems 06/18/2008 5:42 AM
	Wikipedia is good for this sort of thing:- I haven't read it so I can't guarantee that this has your answer but it looks promising. http://en.wikipedia.org/wiki/Flywheel_energy_storage I actually did a search in google for "Wikipedia energy in flywheel". This is often better than going to Wikipedia and searching. __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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Alun1986 (1); Hendrik (1); Randall (1)

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