1
CHAPTER1
THENATUREOFMECHANICALDESIGN
ͳǦͳͶ
Ǥ
ͳͷǤ
ൌͳǤ͹ͷuʹͷǤͶȀൌͶ
ͶͶǤͷ
ʹ͵Ǥ 
ൌͳʹ͹u͸ǤͺͻͷȀൌͺ
ͺ͹͸
ʹͶǤ ǣǢ
ൌ͵ͷൌͲǤͲ͵ͷǢ
ൌ͸͹ͷൌͲǤ͸͹ͷ
 ǣǣൌu
Ǣ
ൌͻǤͺͳȀʹ
2
ʹͷǤ ǣǡൌͳͺͲ͵ͷqǤ
ʹ͸Ǥ ǣͳʹǤͷͳ͸ȀǡͷȀ
ʹ͹Ǥ ǣൌ
Pൌ
͵Ǥ͹ͷuሺͳǤͲȀʹሻȀuͳͶͶʹȀʹൌͷ
ͷͶͲȀʹ
ʹͺǤ ǣ
ൌͳ͹ͷͲǢʹͶȀǢͷǤͲǤǤ