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### TF_OH_Ch05_McPerfPar

Course: MECH 2403, Fall 2009
School: Allan Hancock College
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Word Count: 640

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2403 MECH - Machine Performance Parameters Page 1 of 12 Chapter 5: Machine Performance Parameters Machine performance affected by many phenomena Complex interactions Identify most significant for simplicity Some of practical importance e.g. power output Others just help us understand (and improve) performance Machine Performance Parameters L.C.Spencer 2007 Page 1 of 12 MECH 2403 - Machine Performance...

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2403 MECH - Machine Performance Parameters Page 1 of 12 Chapter 5: Machine Performance Parameters Machine performance affected by many phenomena Complex interactions Identify most significant for simplicity Some of practical importance e.g. power output Others just help us understand (and improve) performance Machine Performance Parameters L.C.Spencer 2007 Page 1 of 12 MECH 2403 - Machine Performance Parameters Page 2 of 12 Brake Power (shaft power) Either net outflow of work (e.g. engine) or net work absorbed (e.g. to compress air) Shaft Power usually called Brake power (bp) Brake Power: so: where: T F r Machine Performance Parameters L.C.Spencer 2007 bp= T . bp= .F.r (kW) (kW) = = = = angular velocity (rad/s) torque (kN.m) net force at end of arm (kN) length of arm (m) Page 2 of 12 MECH 2403 - Machine Performance Parameters Page 3 of 12 Indicated Power Positive displacement machines Can plot p against V Area under curve is W = p dV i.e. Work done Area of whole diagram is net work done on piston each cycle Known as Indicated work Indicated power is rate of doing work Machine Performance Parameters L.C.Spencer 2007 Page 3 of 12 MECH 2403 - Machine Performance Parameters Page 4 of 12 Mean Effective Pressure Positive displacement machine: useful concept of mean effective pressure Actual pressure difference varies through cycle giving net pV area Can substitute imaginary constant pressure process over same volume change for same net work indicated mean effective pressure or imep measure of power we can get out of cylinder useful when comparing engines Machine Performance Parameters L.C.Spencer 2007 Page 4 of 12 MECH 2403 - Machine Performance Parameters Page 5 of 12 Relationship between ip and imep Indicated Power (ip) ip = Indicated Work"/sec relationship between ip and imep is simple d (V max V min ) ip = imep. = imep. swept vol / sec dt applies when producing or absorbing power Machine Performance Parameters L.C.Spencer 2007 Page 5 of 12 MECH 2403 - Machine Performance Parameters Page 6 of 12 Relationship between bp and bmep Brake Power (bp) bp = Work/sec measured at shaft relationship bp between and bmep is similar to imep d (V max V min ) bp = bmep. = bmep. swept vol / sec dt applies when producing or absorbing power Machine Performance Parameters L.C.Spencer 2007 Page 6 of 12 MECH 2403 - Machine Performance Parameters Page 7 of 12 Mechanical Efficiency For engine brake power < indicated power (losses from piston, bearing seal friction, crankshaft windage, oil & water pumps, etc.) & For driven machine (e.g. air compressor) Brake Power > Indicated Power (losses from piston, bearing & seal friction, crankshaft windage, oil & water pumps, etc.) Machine Performance Parameters L.C.Spencer 2007 Page 7 of 12 MECH 2403 - Machine Performance Parameters Page 8 of 12 Want to minimise energy loss in mechanism Mechanical Efficiency is a measure: mech power output to mechanism = power input to mechanism bp = ip ip = bp i.e. mech (engine - ip > bp) and mech (driven machine - bp > ip) Machine Performance Parameters L.C.Spencer 2007 Page 8 of 12 MECH 2403 - Machine Performance Parameters Page 9 of 12 Significance of imep High imep -> smaller engine for given power Friction forces typically increase with size and mass so High imep reduces friction losses per unit power Machine Performance Parameter...

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