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ุทูŠุจ ุจุณู… ุงู„ู„ู‡ ุงู„ุฑุญู…ู† ุงู„ุฑุญูŠู… ุงู„ุณู„ุงู… ุนู„ูŠูƒู… ูˆุฑุญู…ุฉ ุงู„ู„ู‡
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ูˆุจุฑูƒุงุชู‡ ุงู„ูŠูˆู… ู‡ู†ุจุฏุฃ Chapter ุฌุฏูŠุฏ ู‡ู†ุญูƒูŠ ุนู† ุงู„
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deflection ููŠ ุงู„ู€ mechanical elements due to
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applied loads ุทุจุนุง ุงู„ู€ loads ู…ู…ูƒู† ุชูƒูˆู† ู…ุนุฑูˆูุฉ ุจูŠูƒูˆู†
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pure axial ุฃูˆ pure bending ุฃูˆ transverse ุฃูˆ torsion
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ุฃูˆ ุฃูŠ combination ู…ู† ุงู„ู€ loading ู‡ุฐู‡ ู†ุชูŠุฌุฉ ุงู„
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loading ุจูŠุตูŠุฑ ุนู†ุฏูŠ stresses ูˆ deflections ู„ุฃู† ู‡ู†ุดูˆู
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ูƒูŠู ู†ุญุณุจ ุงู„ู€ deflections ููŠ ุงู„ู€ mechanical members
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ุฃูˆู„ ุดูŠุก ุฎู„ู‘ูŠู†ูŠ ุฃุนุฑู ุงู„ู„ูŠ ู‡ูˆ ุงู„ู€ elasticity ุงู„
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elasticity ู‡ูŠ ุฎุงุตูŠุฉ ู„ู„ู…ุงุฏุฉ ุจุชู…ูƒู†ู‡ุง ู…ู† ุงุณุชุฑุฌุงุน
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ุดูƒู„ู‡ุง ุจุนุฏ ู…ุง ุฃุดูŠู„ ุงู„ุฃุญู…ุงู„ ุงู„ู€ elasticity ุจูŠุจู‚ู‰
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ุฎุงุตูŠุฉ ู„ู„ู…ุงุฏุฉ ุงู„ู„ูŠ ู‡ูŠ ุฎุงุตูŠุฉ ุจุชู…ูƒู†ู‡ุง ู…ู† ุงุณุชุฑุฌุงุน
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ุดูƒู„ู‡ุง ุจุนุฏ ู…ุง ุฃุฑูุน ุงู„ุฃุญู…ุงู„ ุนู†ู‡ุง. ุงู„ู€ spring ุนุจุงุฑุฉ ุนู†
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mechanical element ุงู„ู„ูŠ ุฅุฐุง if I apply a force
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ุนู„ูŠู‡ ุจูŠุตูŠุฑ ููŠู‡ deformation ุงู„ู€ spring ุฅุฐุง ุฃู†ุง I
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apply a force ุจูŠุณุงุนุฏู†ูŠ ุงู„ู€ deformation ุฃูˆ if it is
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deformed ุจูŠุนุทูŠู†ูŠ ุงู„ู€ force ุฅุฐุง ุจุถุน ุฒู†ุจุฑูƒ ู‡ูŠู‚ูˆู…ู„ูŠ ุตุญ
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ู‡ุฐุง ู‡ูˆ if ุฒู†ุจุฑูƒ ุงู„ู€ spring rate ุงู„ู€ general equation
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ุงู„ู€ k ุจูŠุณุงูˆูŠ ุงู„ู€ df by dy
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ุงู„ู€ K ุจูŠุณุงูˆูŠ
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DF by DY ูŠุนู†ูŠ ุงู„ู€ DF ุจูŠุณุงูˆูŠ K of Y DY ูŠุนู†ูŠ
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ู„ูˆ ุจุฏู‡ ุฃุนู…ู„ Integral ู…ู† Zero ู„ู€ F
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ู…ู† zero ู„ู€ Y ู‡ูŠูƒูˆู† ุนู†ุฏูŠ F ุชูƒุงู…ู„ ููŠ
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ุญุงู„ุฉ linear spring ุชูƒูˆู† ุงู„ู€ K constant ุชุทู„ุน ุจุฑุฉ
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integration ูƒูˆู† k ุชูƒุงู…ู„ ู…ู† zero ู„ู€ y dy ุงู„ู€ F ุจุชุณุงูˆูŠ
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ู‡ุฐุง ุจุชูƒูˆู† ุชุณุงูˆูŠ k ููŠ y ู‡ุฐุง ููŠ ุญุงู„ุฉ linear spring
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ูŠุนู†ูŠ ุจุชูƒูˆู† ุนู„ุงู‚ุฉ ุจูŠู† ุงู„ู€ F ูˆ ุงู„ู€ Y ูˆ
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ุงู„ู€ slope ู‡ูˆ ุฅูŠุดุŸ K ู„ูŠู†ูŠุฑ ุนู† ุงู„ู€ slope ุฅูŠุดุŸ ุซุงุจุช ู„ูƒู†
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ู„ูˆ ูƒุงู†ุช non linear ุงู„ุนู„ุงู‚ุฉ ุจูŠู† ุงู„ู€ force
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ุฅุฐุง ูƒุงู†ุช nonlinear ู…ุนู†ุงุชู‡ ุงู„ู€ K ุงู„ู€ slope ุจุชุชุบูŠุฑ
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ุตุญุŸ K ุจุชูƒูˆู† function of Y ู‡ู†ุง ู‡ู†ุงุฎุฏ ุงู„ุญุงู„ุฉ ุฅู† ุงู„ู€
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slope is constant ูŠุนู†ูŠ ุงู„ู€ spring is linear ูŠุนู†ูŠ ุงู„ู€
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F ุจุชุณุงูˆูŠ K ููŠ Y ู‡ู†ุงุฎุฏ
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ุฃูˆู„ ุญุงู„ุฉ
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ุงุญู†ุง ุงู„ู‡ุฏู ุฅู†ู†ุง ู†ุญุงูˆู„ ู†ุชุนุงู…ู„ ู…ุน ุงู„ู€ mechanical
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elements ูƒุฃู†ู‡ุง
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ุฒู†ุจุฑูƒ ูƒุฏู‡ ูŠุนู†ูŠ ุฅุฐุง ุนู†ุฏูŠ mechanical element ุนู†ุฏูŠ
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ู…ุซู„ุง bar ุชุญุช
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ุชุฃุซูŠุฑ force F ูŠุนู†ูŠ under pure tension ู‡ูŠูƒูˆู† ุงู„ู€
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stress ูˆ ุฃู†ุง ุทุจุนุง ููŠ ุงู„ู€ elastic region ุฃู†ุง ููŠ ุงู„ู€
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design specially ููŠ ุงู„ู€ elastic region ุงู„ู€ sigma
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ู‡ุชูƒูˆู† E ููŠ epsilon ุทุจุนุง ู†ุชูŠุฌุฉ ุงู„ู€ force ู‡ูŠุตูŠุฑ ููŠ
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ุฅูŠู‡ุŸ ููŠ
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deformation ุฅูŠู‡ุŸ Delta ุงู„ู€ sigma ุดูˆ ูŠุณุงูˆูŠุŸ F ุนู„ู‰ A
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ุตุญุŸ
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ุจุชุณุงูˆูŠ ุงู„ู€ epsilon ุงู„ู„ูŠ ู‡ูŠ ุงู„ู€ delta ุนู„ู‰ L ูุญุณูŠ
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ุนู†ุฏูŠ ุงู„ู€ F ุจุชุณุงูˆูŠ A E ุนู„ู‰ L ููŠ Delta ุฅุฐุง ุจุญุท ู‡ุฐู‡ ุฒูŠ
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ู‡ูŠูƒ ูˆ ู†ุฐูƒุฑ ุฒู†ุจุฑูƒ ุงู„ู„ูŠ ู‡ูŠ ุงู„ู€ F
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ุจุชุณุงูˆูŠ K ููŠ Y ู…ุนู†ุงุชู‡
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ุฅุฐุง ุนู†ุฏูŠ bar under axial
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loading ู…ุนู†ุงุชู‡ ู‡ูˆ ุฒู†ุจุฑูƒ ู‡ูˆ ุฒู†ุจุฑูƒ ุงู„ู€ K ุชุจุนู‡ ุงู„ู„ูŠ ู‡ูˆ
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A ููŠ E ุนู„ู‰ L ู‡ูˆ ุฒู†ุจุฑูƒ ุงู„ู€ K ุจุชุงุนุชู‡ A ููŠ E ุนู„ู‰ L
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00:06:00,630 --> 00:06:06,350
ุทุจุนุง ูˆุงุถุญ ุงู„ู€ stiffness ูƒู„ ู…ุง ูƒุงู† ู…ู‚ุทุน ุฃูƒุจุฑ ูƒู„ ู…ุง
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ูƒุงู† stiff ุฃูƒุซุฑ ุจูŠูƒูˆู† ุงู„ุฒู†ุจุฑูƒ ุตุญุŸ stiff ุฃูƒุซุฑ ูŠุนู†ูŠ
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ุนุดุงู† ุฃุนู…ู„ ูƒู…ูŠุฉ ู…ู† ุงู„ู€ deformation ู…ุญุชุงุฌ ู‚ูˆุฉ ุฃูƒุจุฑ
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ูˆูƒู„ ู…ุง ูŠูƒูˆู† ุฃุทูˆู„ ูƒู„ ู…ุง ูŠูƒูˆู† ุฃู†ู‡ ูŠู…ุบุท ุฃุณู‡ู„ ุตุญุŸ ูˆ ุงู„ู€
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E ุงุญู†ุง ููŠ ุงู„ู€ material science ุญูƒูŠู†ุง ู„ูƒู… ูŠุนู†ูŠ ุงู„ู€ E
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ู…ู…ูƒู† ุชุนุชุจุฑ ู…ุคุดุฑ ุนู„ู‰ ุฒู†ุจุฑูƒูŠุฉ ุจุชุงุนุฉ ุงู„ู…ุงุฏุฉ ู„ุฅู†ู‡ ุงู„ู€
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K ุจุชุชู†ุงุณุจ ุชู†ุงุณุจุง ุทุฑุฏูŠุง ู…ุน ุงู„ู€ ุฅูŠุด ุงู„ู€ E ู…ุนู†ุงุชู‡ ุงู„ู€ K ููŠ
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ุญุงู„ุฉ mechanical element under axial loading ุจุชุณุงูˆูŠ A
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E ุนู„ู‰ L ููŠ
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ุญุงู„ุฉ
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bar ู…ู‚ุทุน ู…ุฏูˆุฑ ู…ุซุจุช
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ู„ู„ุทุฑู ุงู„ุซุงู†ูŠ ู‡ูˆ ุนู„ูŠู‡ torque T ุญูŠุซ ูŠุตูŠุฑ ููŠู‡ angle ูˆ
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00:07:12,610 --> 00:07:19,870
twist theta ุตุญุŸ ุงู„ู€ theta ุจูŠุณุชูˆูŠ TL
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00:07:22,010 --> 00:07:31,090
ุนู„ู‰ ุฌ ุฌ ูŠุนู†ูŠ ุงู„ู€ torque ู‡ุชูƒูˆู† ุจุชุณุงูˆูŠ ุฌ
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00:07:31,090 --> 00:07:44,630
ุฌ ุนู„ู‰ L ููŠ ุงู„ู€ theta ุงู„ู€
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... ุงู„ ... ุงู„ู€ T ุนู†ุฏูŠ ุงู„ู€ F
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00:07:51,800 --> 00:07:57,860
ุงู„ุขู† ุงู„ู€ theta ู‡ูŠ angular displacement ู‡ุฐู‡ linear
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displacement T ู‡ูŠ force ูˆุชุญุงูˆู„ ุชุนู…ู„ rotation ุตุญ
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ูู„ู…ุง ุชุนู…ู„ ุชู…ุงุซู„ ุจูŠู† ุงู„ู…ุนุงุฏู„ุชูŠู† ุจุชูƒูˆู† ุงู„ู€ K ููŠ ุญุงู„ุฉ
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round bar under torsion
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00:08:17,780 --> 00:08:27,840
ุฌ ุฌ ุนู„ู‰ ุงู„ู€ ูŠุนู†ูŠ ูƒุฃู†ู‡ ู‡ุฐุง ุฒู†ุจุฑูƒ ู‡ูˆ ูุนู„ุง ุฒู†ุจุฑูƒ ูˆู‡ูŠ
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00:08:27,840 --> 00:08:40,820
ุงู„ู€ k ุจุชุงุนุชู‡ ุฌ ุฌ ุนู„ู‰ ุงู„ู€ ู„ุฃู†
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00:08:40,820 --> 00:08:43,020
ููŠ ุญุงู„ุฉ beams straight beams
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straight beams ูˆุนู„ูŠู‡
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some loading
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ู‡ุชุตูŠุฑ ููŠู‡ some bending ุตุญ ูŠุนู†ูŠ ู…ู…ูƒู† ู†ุทู„ุน ุงู„ู€ shear
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diagram ูˆ ุงู„ู€ bending moment diagram ุทุจุนุง ู†ุชูŠุฌุฉ ุงู„ู€
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loading ู‡ุชุตูŠุฑ ุงู„ู€ deformation ุงู„ู€ deformation ุนู†ุฏ ุฃูŠ
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ู†ู‚ุทุฉ ู‡ูŠูƒูˆู† ููŠู‡ ุนู†ุฏ ู‡ูŠู† ู‡ูŠู† ู‡ูƒูˆู† ููŠู‡ ู…ุฑูƒุฒ ุชูƒูˆู‘ุฑู‡ ุตุญ
82
00:09:44,080 --> 00:09:48,200
ููŠ ุนู„ุงู‚ุฉ ุจูŠู† ู…ุฑูƒุฒ ุงู„ุชูƒูˆู‘ุฑ ุนู†ุฏ ุฃูŠ location ูˆุงุญุฏ ุนู„ู‰
83
00:09:48,200 --> 00:09:56,500
ุฑูˆ ุจุงุณู…ู‡ M ุนู„ู‰ E ููŠ I M ู‡ูŠ ุงู„ู€ bending moment at
84
00:09:56,500 --> 00:10:00,060
the specified location ูˆ ุงู„ู€ E ุงู„ู„ูŠ ู‡ูŠ ุงู„ู€ modulus
85
00:10:00,060 --> 00:10:03,820
ููŠ ุงู„ุฃุณุงุณูŠู‡ ูˆ I ู‡ูŠ moment of inertia ู„ู„ู…ู‚ุทุน
86
00:10:03,820 --> 00:10:11,320
ู„ู„ู€ section ุทุจุนุง ุงู„ูˆุงุญุฏ ุนู„ู‰ ุฑูˆ ู…ู† ุงู„ู€ calculus course
87
00:10:11,320 --> 00:10:19,290
ุงู„ู€ calculus ู…ุด ู‡ุฎุด ููŠ ุงุดุชู‚ุงู‚ุฉ ุจุชุณุงูˆูŠ ุงุดุชู‚ุงู‚ู‡ุง ู…ุด
88
00:10:19,290 --> 00:10:30,790
ุตุนุจุฉ ุงู„ู„ูŠ ู‡ูˆ d square y ุนู„ู‰ dx square ููŠ ูˆุงุญุฏ ุฒุงุฆุฏ
89
00:10:30,790 --> 00:10:42,130
dy ุนู„ู‰ dx ุงู„ูƒู„ ุชุฑุจูŠุน ุงู„ูƒู„ ุฃุณุทู„ุฉ ุนู„ู‰ ุงุชู†ูŠู† ูŠุนู†ูŠ
90
00:10:42,130 --> 00:10:43,130
ุฅุฐุง ุนู†ุฏูŠ ู‡ุงูŠ ุงู„ู€ beam
91
00:10:47,220 --> 00:10:59,480
ูˆุตุงุฑ ููŠู‡ deflection ุงู„ู€
92
00:10:59,480 --> 00:11:10,380
dy ุนู„ู‰ dx ู‡ูŠ ุงู„ู€ slope ุงู„ู€ dy ุนู„ู‰ dx ู‡ูŠ ุงู„ู€ slope ุนู†ุฏ
93
00:11:10,380 --> 00:11:13,040
ุงู„ู†ู‚ุทุฉ ู‡ุฐู‡ ู‡ูŠ ุงู„ู€ y ุตุญ ู‡ุฐู‡ ุงู„ู€ y ุงู„ู„ูŠ ู‡ูˆ ุงู„ู€
94
00:11:13,040 --> 00:11:21,800
deflection ูˆ ุงู„ู€ slope ุงู„ู„ูŠ ู‡ูˆ dy ุนู„ู‰ dx ุทุจุนุง ููŠ ุงู„ู€
95
00:11:21,800 --> 00:11:27,340
beams ุจุชูƒูˆู† ุงู„ู€ dy ุนู„ู‰ dx ู…ุง ุชูƒูˆู†ุด ู…ุงู†ุญูˆุธุฉ ุงู„ู€ slope
96
00:11:29,090 --> 00:11:33,790
ุจุชูƒูˆู† small ุตุบูŠุฑุฉ ูŠุนู†ูŠ ุจุชูƒูˆู† ู‚ุฑูŠุจุฉ ู…ู† ุงู„ุตูุฑ ูŠุนู†ูŠ ุงู„ู€
97
00:11:33,790 --> 00:11:40,310
dy ููŠ ุงู„ู€ beams ุนู„ู‰ dx ุจุชูƒูˆู† ุฃุตุบุฑ ุจูƒุซูŠุฑ ู…ู† ุงู„ูˆุงุญุฏ
98
00:11:40,310 --> 00:11:46,170
ุฃุตุบุฑ ุจูƒุซูŠุฑ ู…ู† ุงู„ูˆุงุญุฏ ูŠุนู†ูŠ ู„ูˆ ูƒุงู†ุช ู…ุซู„ุง ู†ุญูƒูŠ ุงู„ู€
99
00:11:46,170 --> 00:11:51,850
slope ู…ุซู„ุง one degree ู…ุซู„ุง one degree ู‡ุชูƒูˆู† dy ุนู„ู‰
100
00:11:51,850 --> 00:11:55,110
ู…ุฆุชูŠู† ูˆ ุซู…ุงู†ูŠู† ุงู„ู„ูŠ ู‡ูŠุญุณูˆู„ูŠ dy ุนู„ู‰ ู…ุฆุชูŠู† ูˆ ุซู…ุงู†ูŠู†
101
00:11:55,110 --> 00:11:56,350
account ุชุทู„ุน
102
00:12:16,830 --> 00:12:25,430
.017 ูŠุนู†ูŠ ู„ูˆ ุญุทูŠุช ูˆุงุญุฏ ู‡ุฐุง ุฃุฎุฐ ุงู„ู€ term ู‡ุฐุง ูˆุงุญุฏ
103
00:12:25,430 --> 00:12:38,130
ุฒุงุฆุฏ .017 ุชุฑุจูŠุน ุงู„ู„ูŠ ู‡ูˆ ูˆุงุญุฏ ูˆ ู†ุต ุงุญุณุจูˆุง ู„ูŠู‡ ุฃู†ุง
104
00:12:38,130 --> 00:12:39,650
ุจุนูˆุถ ููŠ ู‡ุฐุง ููŠ ุงู„ุจู‚ุฑุฉ ุจุณ
105
00:12:48,370 --> 00:13:01,210
ุชุทู„ุน one zero ุชู…ุงู†ูŠุฉ ูŠุนู†ูŠ ุชู‚ุฑูŠุจุง ูˆุงุญุฏ ุชู‚ุฑูŠุจุง ูˆุงุญุฏ
106
00:13:01,210 --> 00:13:13,370
ูˆุงุญุฏ ุตูุฑ ุตูุฑ ุฃุฑุจุนุฉ ูƒู…ุงู† ุตูุฑ ู…ุนู†ุงุชู‡ ุจุชูƒูˆู† ูุนู„ุง ุงู„ู€
107
00:13:13,370 --> 00:13:17,910
dy ู‚ู„ูŠู„ ู‡ุฐุง ุงู„ู€ term ุจูŠูƒูˆู† ุฃู‚ู„ ุจูƒุซูŠุฑ ู…ู† ูˆุงุญุฏ ู…ุนู†ุงุชู‡
108
00:13:17,910 --> 00:13:22,450
ุจูŠูƒูˆู† ู†ุญูƒูŠ ุฅู† ูˆุงุญุฏ ุนู„ู‰ ุฑูˆ ุจุชุณุงูˆูŠ ุชู‚ุฑูŠุจุง ูˆ ุจุฏู‚ุฉ
109
00:13:22,450 --> 00:13:31,150
ุนุงู„ูŠุฉ ุจุชุณุงูˆูŠ d square y ุนู„ู‰ d x square ู…ุนู†ุงุชู‡ ุงุชุนูˆุฏ
110
00:13:31,150 --> 00:13:37,770
ุนู† ูˆุงุญุฏ ุนู„ู‰ ุฑูˆ ุจูŠุตูŠุฑ ุจูŠุณุงูˆูŠ d square y by dx
111
00:13:37,770 --> 00:13:42,090
square ู…ุนู†ุงุชู‡ ุฅุฐุง ุฃู†ุง ุนุงุฑู ุงู„ู€ bending moment
112
00:13:45,350 --> 00:13:51,770
equation ูˆุนุงุฑู ุงู„ู€ I ุจู‚ุฏุฑ ุฃุนู…ู„ integration ู…ุฑุชูŠู†
113
00:13:51,770 --> 00:13:57,810
ูˆุงุทู„ุน ุงู„ู€ equation ุฃูˆู„ ุดูŠุก ุงู„ู„ูŠ ู‡ูˆ ุงู„ู€ slope ุฃูˆู„
114
00:13:57,810 --> 00:14:00,090
ู…ุฑุฉ ุจู‚ูŠ ุฃุนู…ู„ integration ุฃูˆู„ ู…ุฑุฉ ุจุทู„ุน ู‚ูŠู…ุฉ ุงู„ู€
115
00:14:00,090 --> 00:14:02,910
deflection at any location as a function of X
116
00:14:12,560 --> 00:14:20,460
ุทูŠุจ ุฎู„ูŠู†ุง ู†ุดูˆู ู…ุซุงู„ ุนู†ุฏูŠ
117
00:14:20,460 --> 00:14:32,860
beam ุนู†ุฏูŠ
118
00:14:32,860 --> 00:14:35,500
beam ุนู„ูŠู‡ ุงู„ู€ load ู…ูˆุฒุน
119
00:14:45,260 --> 00:15:04,540
ุงู„ู€ load ุงู„ู…ูˆุฒุน ุงู„ู„ูŠ ู‡ูˆ ุงู„ู€ W ุทูˆู„
120
00:15:04,540 --> 00:15:10,620
ุงู„ู€ beam 2 ุงู†ุด ุทุจุนุง ู‡ูŠูƒูˆู† ุฑุฏ ุงู„ูุนู„ ุนู„ู‰ ุงู„ุทุฑู
121
00:15:10,620 --> 00:15:20,070
ู‡ุฐุง WL ุนู„ู‰ ุงุชู†ูŠู† ุตุญุŸ ู‡ู†ุงูƒ ูˆุนู†ุฏูŠ ู‡ู†ุง R ูˆุงุญุฏ ุงู„ู„ูŠ ู‡ูˆ
122
00:15:20,070 --> 00:15:29,350
WL ุนู„ู‰ ุงู„ุชุงู†ูŠ ูˆู‡ู†ุง ุนู†ุฏูŠ R ุงู„ุชุงู†ูŠ ุจุชุณุงูˆูŠ WL ุนู„ู‰ ุงู„ุชุงู†ูŠ
123
00:15:29,350 --> 00:15:33,910
ูˆู‡ุฐุง ุงู„ุทูˆู„ L
124
00:15:47,600 --> 00:15:53,720
ู„ูˆ ุจุฏูŠ ุฃุฑุณู… ุงู„ ... ุงู„ู€ shear force diagram ... ุงู„ู€ shear
125
00:15:53,720 --> 00:15:54,060
diagram
126
00:16:25,670 --> 00:16:33,130
ุจุจุฏุฃ ู‡ู†ุง ูˆ WL ุนู„ู‰ ุงุชู†ูŠู† ุตุญ ุงู„ู€ shear ูŠุนู†ูŠ ูˆ WL ุนู„ู‰
127
00:16:33,130 --> 00:16:45,290
ุงุชู†ูŠู† ู‡ุชุฑูŠุญ ุงู„ู€ area ู‡ุฐู‡ ุงู„ู„ูŠ ู‡ูŠ minus WL ุนู„ู‰
128
00:16:45,290 --> 00:16:48,910
ุงุชู†ูŠู† ุตุญ ู‡ุฐุง ุงู„ู€ shear diagram
129
00:16:55,130 --> 00:17:03,030
ุงู‡ ู…ุงุดูŠ ู†ุนุฑู ุฃุนุทูŠูƒูŠู‡ุง ุงู„ู€ moment ู‡ุงุฏ ุจุชู…ุซู„ ุฅูŠู‡ุŸ ุงู„ู€
130
00:17:03,030 --> 00:17:10,830
slope ุตุญุŸ ู‡ุชูƒูˆู† ... ู‡ุชุจุฏุฃ ู…ู† zero ุฒูŠุงุฏ ุงู„ู…ุณุงุญุฉ ู‡ุฐู‡ุŒ
131
00:17:10,830 --> 00:17:18,430
ู…ุธุจูˆุทุŒ ู‡ูŠูƒูˆู† ุดูƒู„ ุงู„ู€ moment ุฏุง ูŠุง ุฌู…ุงุนุฉ ู„ูˆ
132
00:17:18,430 --> 00:17:20,730
ุฃุฎุฏุช at any location x ู‡ู†ุง
133
00:17:28,340 --> 00:17:33,440
at any location x ูˆุงุฎุฏุช
134
00:17:33,440 --> 00:17:38,120
free body ู‡ูƒูˆู†
135
00:17:38,120 --> 00:17:41,900
ุนู†ุฏ ู‡ู†ุง ู‡ุงูŠ
136
00:17:41,900 --> 00:17:51,840
ุนู†ุฏ R ูˆุงุญุฏ so WL ุนู„ู‰ ุงุชู†ูŠู† ู‡ู†ุง
137
00:17:51,840 --> 00:17:56,820
ุงู„ู€ shear ู‡ุฐู‡
138
00:17:56,820 --> 00:18:10,880
x ุฃุฎุฐุช ู†ุณุจุฉ ูŠุนู†ูŠ ู‡ุฐู‡ ุงู„ู€ V ุงู„ู€ V ุงู„ู€ V ุนู„ู‰ WL ุนู„ู‰ 2
139
00:18:10,880 --> 00:18:23,960
ู‡ุฐู‡ ุนู„ู‰ ู‡ุฐู‡ ุจุชุณุงูˆูŠ L ุนู„ู‰ 2 ู†ุงู‚ุต X ุนู„ู‰ L ุนู„ู‰ 2 ุตุญุŸ
140
00:18:23,960 --> 00:18:25,640
ู…ุธุจูˆุทุŸ
141
00:18:28,370 --> 00:18:41,890
ูŠุนู†ูŠ ู‡ูŠูƒูˆู† ุฃู†ู‘ ุงู„ู€ V ู‡ุชูƒูˆู† ุณูˆู‰ WL ุนู„ู‰ 2 ููŠ 1
142
00:18:41,890 --> 00:18:52,510
ู‚ุณู…ุช L ุนู„ู‰ 2 ุนู„ู‰ L ุนู„ู‰ 2 ู†ุงู‚ุต 2X ุนู„ู‰
143
00:18:52,510 --> 00:18:54,350
L ุตุญุŸ
144
00:18:56,600 --> 00:19:00,680
ุฎู„ู‘ูŠู†ูŠ ุฃุชุฃูƒุฏ ุจู…ุนุงุฏู„ุฉ ุตุญ ู‡ู†ุญุท X ุจุงู„ุณุงูˆูŠุฉ ุตูุฑ ุชุทู„ุน
145
00:19:00,680 --> 00:19:04,680
ุงู„ู€ V ููŠ ุงู„ุฃูˆู„ ุฃูŠุด WL ุนู„ู‰ ุงุชู†ูŠู† ุฎู„ู‘ูŠู†ูŠ ุฃุญุท X
146
00:19:04,680 --> 00:19:15,280
ุจุงู„ุณุงูˆูŠุฉ ุงู„ู€ .. ูŠุนู†ูŠ ู‡ุชูƒูˆู† 1 ู†ุงู‚ุต 2 ู†ุงู‚ุต
147
00:19:15,280 --> 00:19:17,720
1 ู‡ุชูƒูˆู† minus WL ุนู„ู‰ ุงุชู†ูŠู† ู…ุนู†ุงู‡ ุงู„ู…ุนุงุฏู„ุฉ ุฃูŠุด
148
00:19:17,720 --> 00:19:22,320
ุตุญูŠุญ ุงุญู†ุง
149
00:19:22,320 --> 00:19:27,810
ููŠ ุนู„ุงู‚ุฉ ุจูŠู† ุงู„ู€ .. ุงู„ู€ shear ูˆ ุงู„ู€ moment ูˆ ููŠู‡ ุนู„ุงู‚ุฉ
150
00:19:27,810 --> 00:19:32,490
ุจูŠู† ุงู„ู€ V ูˆ
151
00:19:32,490 --> 00:19:43,330
ุงู„ู€ Q ูˆ ููŠู‡ ุนู„ุงู‚ุฉ ุจูŠู† moment ูˆ ุงู„ู€ V ูˆุงุถุญ ุฃู†ู‘ ุงู„ู€ V ุฃูŠุด
152
00:19:43,330 --> 00:19:49,630
ุงู„ุณุงุนุฉ dM by
153
00:19:49,630 --> 00:19:50,850
dX ุตุญุŸ
154
00:19:54,280 --> 00:20:01,160
ู‡ุฐุง ุฏุฑุฌุชู‡ ุฃู‚ู„ ู…ู† ู‡ุฐุง ูˆู…ุนู†ุงู‡ ุงู„ู€ V ุจูŠุณุงูˆูŠ dM by dX
155
00:20:01,160 --> 00:20:05,500
ูŠุนู†ูŠ ุงู„ู€ dM ุจุญุซ
156
00:20:05,500 --> 00:20:17,200
ุณูˆู‰ V dX ู„ูˆ ุฏุนู†ุง ุงู„ุชูƒุงู…ู„ ู…ู† ุตูุฑ ู„ู€ M ูˆู‡ูŠู† ุชูƒุงู…ู„ ุงู„ู€
157
00:20:17,200 --> 00:20:21,460
V ุนู†ุฏ ุงู„ุตูุฑ ุจูŠุณุงูˆูŠ WL ุนู„ู‰ ุงุชู†ูŠู†
158
00:20:25,780 --> 00:20:37,940
ู„ู€ X ุญูŠูƒูˆู† ู…ุนู†ุงุชู‡ ุนู†ุฏูŠ M ุจุณ ูƒู†ุช ุณุงูˆูŠ ุชูƒุงู…ู„ ุงู„ู€ V
159
00:20:37,940 --> 00:20:50,790
ุงู„ู„ูŠ ู‡ูŠ WL ุนู„ู‰ ุงุชู†ูŠู† ููŠ 1 ู†ุงู‚ุต 2X ุนู„ู‰ L dX
160
00:20:50,790 --> 00:21:09,330
ูˆุญุฏูˆุฏ ุชูƒุงู…ู„ ู…ู† WL ุนู„ู‰ 2 ู…ู† 0 ู„ู€ X ูŠุนู†ูŠ
161
00:21:09,330 --> 00:21:21,500
ุงุญู†ุง ู†ูƒูˆู† ุนู†ุฏู‡ WL ุนู„ู‰ ุงุชู†ูŠู† ููŠ X ู†ุงู‚ุต X ุชุฑุจูŠุน ุนู„ู‰
162
00:21:21,500 --> 00:21:29,700
L ู…ู† ุตูุฑ ู„ู€ X ูˆู…ุนู†ุงุชู‡ ู‡ุชูƒูˆู† WL
163
00:21:29,700 --> 00:21:40,200
ุนู„ู‰ ุงุชู†ูŠู† ููŠ X ู†ุงู‚ุต WX
164
00:21:40,200 --> 00:21:49,730
ุชุฑุจูŠุน ุนู„ู‰ ุงุชู†ูŠู† ู„ูŠู‡ ุงู„ู…ุนุงุฏู„ุฉ ุงู„ู„ูŠ ู‡ูˆ ู…ุทู„ุนู‡ุงุŸ ุงู„ุขู†
165
00:21:49,730 --> 00:21:57,870
ุนุดุงู† ุฃูˆุฏูŠ ุงู„ู€ deflection ุงุญู†ุง ุญูƒูŠู†ุง M ุนู„ู‰ EI ูŠุณุงูˆูŠ D
166
00:21:57,870 --> 00:22:08,030
Square Y ุนู„ู‰ DX Square ูŠุนู†ูŠ ุงู„ู€
167
00:22:08,030 --> 00:22:12,110
M ุนู†ุฏูŠ ุงู„ู„ูŠ ู‡ูŠ W
168
00:22:13,610 --> 00:22:19,570
L ูˆุญุฏ
169
00:22:19,570 --> 00:22:26,510
ุนู„ู‰ EI ููŠ
170
00:22:26,510 --> 00:22:31,910
WL
171
00:22:31,910 --> 00:22:39,770
ุนู„ู‰ ุงุชู†ูŠู† ููŠ X ู†ุงู‚ุต WX ุชุฑุจูŠุน ุนู„ู‰ ุงุชู†ูŠู†
172
00:22:45,170 --> 00:22:49,730
ู…ุนู†ุงุชู‡ dy by
173
00:22:49,730 --> 00:22:54,150
dx ู‡ุชูƒูˆู†
174
00:22:54,150 --> 00:23:01,470
ุงู„ุชูƒุงู…ู„ ู‡ุฐุง ู‡ุชูƒูˆู† ุนู„ู‰ E constant ูˆ I constant
175
00:23:01,470 --> 00:23:10,030
ู‡ุชูƒูˆู† 1 ุนู„ู‰ EI 1
176
00:23:10,030 --> 00:23:23,390
ุนู„ู‰ EI ุงู„ุชูƒุงู…ู„ ู…ู† ุตูุฑ ู„ู€ X ู„ู€ WL ุนู„ู‰ ุงุชู†ูŠู† ููŠ X ู†ุงู‚ุต
177
00:23:23,390 --> 00:23:33,490
WX ุชุฑุจูŠุน ุนู„ู‰ ุงุชู†ูŠู† DX ูŠุนู†ูŠ ู‡ุชูƒูˆู† ุทุจุนู‹ุง ุฒุงุฆุฏ ุฃูŠุด
178
00:23:33,490 --> 00:23:36,830
constant ู…ุง ุญุทู‘ูŠุชุด ุญุฏูˆุฏ ุงู„ integration
179
00:23:41,500 --> 00:23:46,020
ุฅุฐุง ุนู…ู„ุช ุฒูŠ ู‡ูŠูƒ ู…ุง ุญุทู‘ูŠุชุด ุญุฏูˆุฏ ุงู„ integration ู‡ุชูƒูˆู†
180
00:23:46,020 --> 00:23:58,760
ู†ุนู…ู„ ุงุดุชู‚ุงู‚ 1 ุนู„ู‰ EI ููŠ WL
181
00:23:58,760 --> 00:24:16,160
X ุชุฑุจูŠุน ุนู„ู‰ 4 ู†ุงู‚ุต W X ุชูƒุนูŠุจ ุนู„ู‰ 6 ุฒุงุฆุฏ C1
182
00:24:16,160 --> 00:24:23,500
ู‡ุฐู‡ dy by dx ุตุญุŸ ุนุดุงู†
183
00:24:23,500 --> 00:24:26,640
ุงุญุณุจ y deflection ุจุนู…ู„ ูƒู…ุงู† ู…ุฑุฉ integration ุญุณูŠู†
184
00:24:26,640 --> 00:24:31,380
ุฏูŠ ุงู„ู€ y ุจุงู„ุณุงูˆูŠุฉ
185
00:24:31,380 --> 00:24:35,220
1
186
00:24:35,220 --> 00:24:38,820
ุนู„ู‰ EI ุชูƒุงู…ู„
187
00:24:40,480 --> 00:24:55,560
WL ุนู„ู‰ 4 X ุชุฑุจูŠุน ู†ุงู‚ุต W X ุชูƒุนูŠุจ ุนู„ู‰ 6 ุฒุงุฆุฏ
188
00:24:55,560 --> 00:25:02,420
C1 DX
189
00:25:06,390 --> 00:25:13,370
ุจู†ูƒู…ู„ู‡ุง ู‡ุช ุฒุงุฆุฏ C2 ู„ุฃู† ุฎู„ุงุต ุตุงุฑ ุฌุฒุก ู…ู† dy by dx
190
00:25:13,370 --> 00:25:19,810
ุชุญุณูŠู† ุนู†ุฏูŠ 1
191
00:25:19,810 --> 00:25:27,010
ุนู„ู‰ ุฃูˆ ุฎู„ูŠู†ุง ู†ุทู„ุน ุงู„ู€ W ุจุฑุฉ 1 ุนู„ู‰ EI ููŠ
192
00:25:27,010 --> 00:25:33,410
ุทุจุนู‹ุง ุงู„ู€ 1 ุนู„ู‰ EI ุจุณ ุฏุงุฎู„ ุนู„ู‰ ู‡ุฐุง ุงู„ู€ term ููŠ
193
00:25:38,020 --> 00:25:50,720
WL X ุชูƒุนูŠุจ ุนู„ู‰ 12 ู†ุงู‚ุต W X ู‚ูˆู‘ุฉ 4 ุนู„ู‰ 24
194
00:25:50,720 --> 00:25:55,240
ูˆ 20 ุฒุงุฆุฏ
195
00:25:55,240 --> 00:26:01,100
C1 X ุฒุงุฆุฏ C2
196
00:26:14,210 --> 00:26:22,390
ุทูŠุจ ุนุดุงู† ุฃูˆุฌุฏ ุงู„ู€ C1 ูˆ C2 ุฃูŠุด ุจุชุณุงูˆูŠ ุงู„ู€ boundary
197
00:26:22,390 --> 00:26:28,250
conditions boundary conditions ู†ุญูƒูŠ at X
198
00:26:28,250 --> 00:26:33,810
ุจูŠุณุงูˆูŠ ุตูุฑ ุงู„ู€ Y ุจูŠุณุงูˆูŠ ุตูุฑ ูˆ ุฃู†ุง ุจุชู‚ุนุฏ ููŠ ุงู„ู…ุนุงุฏู„ุฉ
199
00:26:33,810 --> 00:26:41,390
ู‡ุฐู‡ ู‡ุชูƒูˆู† ุฃู†ุฏูŠ ุตูุฑ ุจุชุณุงูˆูŠ ุตูุฑ
200
00:26:41,390 --> 00:26:53,140
ุตูุฑ ุตูุฑ ุงู„ู€ C2 ุงู„ู€ C2 ุฃูŠุด ูŠุณุงูˆูŠุŸ ุตูุฑ ุงู„ู€ X ุจุชุณุงูˆูŠ
201
00:26:53,140 --> 00:27:01,380
L ุจุฑุถู‡ Y ุจุชุณุงูˆูŠ ุฃูŠุดุŸ ุตูุฑุŒ ุตุญุŸ ุฅู†ู‘ ุฃู†ุง ูƒู†ุช ุนู†ุฏู‡ ุตูุฑ
202
00:27:01,380 --> 00:27:04,680
ุจุชุณุงูˆูŠ
203
00:27:04,680 --> 00:27:11,940
1 ุนู„ู‰ EI ููŠ
204
00:27:15,310 --> 00:27:25,290
WL 4 ุนู„ู‰ 12 ู†ุงู‚ุต WL
205
00:27:25,290 --> 00:27:38,630
4 ุนู„ู‰ 24 ุฒุงุฆุฏ C1 ููŠ L ุงู„ู€ C2
206
00:27:38,630 --> 00:27:39,450
ุญูƒูŠู†ุง ุตูุฑ ุงุญู†ุง
207
00:27:44,040 --> 00:27:51,220
ูŠุนู†ูŠ C1 ู‡ุชูƒูˆู† ุณุงูˆูŠ ุทุจุนู‹ุง ู‡ุฐู‡ 1 ุนู„ู‰ 12 ู…ุนู†ุงุชู‡
208
00:27:51,220 --> 00:27:55,460
2 ุนู„ู‰ 24 2 ุนู„ู‰ 24 ูŠุนู†ูŠ
209
00:27:55,460 --> 00:28:00,000
1 ุนู„ู‰ 24 ูŠุนู†ูŠ ู‡ุชูƒูˆู† C1 ุจุงู„ุณุงูˆู‰ minus
210
00:28:00,000 --> 00:28:09,780
WL ุชูƒุนูŠุจ ุนู„ู‰ 24
211
00:28:22,680 --> 00:28:28,220
C1 -WL ุชูƒุนูŠุจ ุนู„ู‰ 24EI
212
00:28:40,440 --> 00:28:51,740
in ุจุณูŠุทุฉ 1 ุนู„ู‰ EI ููŠู‡ ุฎู„ู‘ู†ุง
213
00:28:51,740 --> 00:28:56,360
ู†ุงุฎุฏ 24 ุชุญุช ู‡ุงุฎุฏ
214
00:28:56,360 --> 00:29:01,200
W ูˆุงุฎุฏ
215
00:29:01,200 --> 00:29:06,560
24 EI ููŠู‡
216
00:29:08,840 --> 00:29:13,820
ูŠุนู†ูŠ ุฃู†ุง ุฃู‚ุฏุฑ ุฃุญุถุฑ ุจุงู„ุจุณุท ููŠ 24 ุนู„ู‰ 24 ูŠุนู†ูŠ ุชูƒูˆู†
217
00:29:13,820 --> 00:29:20,180
ุฏูŠ 2 ุงู„ู€
218
00:29:20,180 --> 00:29:26,380
X ุชูƒุนูŠุจ ู†ุงู‚ุต
219
00:29:26,380 --> 00:29:33,980
X ู‚ูˆู‘ุฉ 4 ุฒุงุฆุฏ
220
00:29:33,980 --> 00:29:35,680
ุงู„ู€ C1 ุงู„ู„ูŠ ู‡ูˆ minus
221
00:29:40,070 --> 00:29:52,570
WL ุชูƒุนูŠุจ ุนู„ู‰ 24 EI ูŠุนู†ูŠ
222
00:29:52,570 --> 00:30:07,580
ุงุฎุฏุช W ุนู„ู‰ 24 EI ููŠ ุงู„ู…ุนุงุฏู„ุฉ 2 ุงู„ู€ X
223
00:30:07,580 --> 00:30:16,720
ุชูƒุนูŠุจ ู…ุงูŠู†ุต X ู‚ูˆู‘ุฉ 4 ู…ุงูŠู†ุต
224
00:30:16,720 --> 00:30:25,680
ู‡ู†ุง
225
00:30:25,680 --> 00:30:31,600
ููŠ X ู‡ุฐู‡ ุตุญ ู…ุงูŠู†ุต ุงู„ู€ ุชูƒุนูŠุจ
226
00:30:35,000 --> 00:30:41,180
ููŠ X ู…ุธุจูˆุท
227
00:30:41,180 --> 00:30:53,420
ู‡ุฐู‡ ุงู„ู…ุนุงุฏู„ุฉ ู‡ุฐู‡ ุงู„ู€ Y ุงู„ู€ slope ู‡ูŠูƒูˆู† ุงู„ุณุงูˆูŠ dy by
228
00:30:53,420 --> 00:31:04,380
dx ุจุงู„ุณุงูˆู‰ ู‡ุชูƒูˆู† W ุนู„ู‰ 24 EI
229
00:31:06,420 --> 00:31:10,580
ููŠ 6
230
00:31:10,580 --> 00:31:24,460
ุงู„ู€ X ุชุฑุจูŠุน ู†ุงู‚ุต 4 X ุชูƒุนูŠุจ ู†ุงู‚ุต ุชูƒุนูŠุจ
231
00:31:33,170 --> 00:31:39,710
ุทูŠุจ ุตุงุฑุช ุงู„ู…ุนุงุฏู„ุฉ ุฌุงู‡ุฒุฉ ู„ู„ู€ .. ู„ู„ู€ deflection .. ู„ู„ู€
232
00:31:39,710 --> 00:31:43,670
deflection ูˆ ู„ู„ู€ slope ู…ุนู†ุงุชู‡ ูƒุงู† ุฃูˆุฏูŠ ุงู„ู€
233
00:31:43,670 --> 00:31:49,050
deflection ูˆ ุงู„ู€ slope ููŠ ุฃูŠ ู†ู‚ุทุฉ ู„ุฃู† ูˆูŠู† ุงู„ู€ slope
234
00:31:49,050 --> 00:31:54,910
.. ูˆูŠู† ุงู„ู€ deflection maximum ูˆูŠู†
235
00:31:54,910 --> 00:32:02,160
ุจูŠูƒูˆู† ุงู„ู€ deflection maximumุŸ ููŠ ุงู„ู†ุต ุตุญุŸ ูŠุนู†ูŠ Y
236
00:32:02,160 --> 00:32:14,620
maximum ู†ุญูƒูŠ at X ุจุงู„ุณุงูˆู‰ L ุนู„ู‰ 2 ุจุชูƒูˆู† ุงู„ู€ Y is
237
00:32:14,620 --> 00:32:20,680
max ุจุชูƒูˆู† maximum ุชุนูˆุฏ
238
00:32:20,680 --> 00:32:27,020
ุนู† X ูˆ L ุจุงู„ุณุงูˆู‰ ุจู€ maximum ุทุจุนู‹ุง ุฏู‡ ุงุฌุชู…ุงุน ุฏูˆู„ ุชู€
239
00:32:27,020 --> 00:32:30,000
check ุฃู†ุช ุฏุงูŠู…ุง ุงุฌุชู…ุงุน ู…ุนุงุฏู„ุงุช ุชู€ check ุนู„ูŠู‡ุง ุญุท X
240
00:32:30,000 --> 00:32:30,720
ุจุงู„ุณุงูˆู‰ ุตูุฑ
241
00:32:40,280 --> 00:32:45,920
ู†ุงู‚ุต 1 ู†ุงู‚ุต 1 ู†ุงู‚ุต ุตูุฑ ู†ุงู‚ุต ุตูุฑ ู†ุงู‚ุต ุตูุฑ ู†ุงู‚ุต ุตูุฑ
242
00:32:45,920 --> 00:32:52,840
ู†ุงู‚ุต ุตูุฑ ู†ุงู‚ุต ุตูุฑ ู†ุงู‚ุต ุตูุฑูŠุนู†ูŠ ู‡ูŠูƒูˆู† 6 ู„ู€ 4 1 ูˆ
243
00:32:52,840 --> 00:33:01,080
ู†ุต ู†ุงู‚ุต ุซู…ู† ุฑุจุน ููŠ ุซู…ู† ู†ุงู‚ุต ู†ุต 1 ู†ุงู‚ุต 1
244
00:33:01,080 --> 00:33:11,880
ุจุชุทู„ุน ุจุงู„ุณุงูˆูŠุฉ zero ู‡ูŠูƒ
245
00:33:11,880 --> 00:33:12,900
ูˆ ุฎู„ุตู†ุง ุงู„ู…ุญุงุถุฑุฉ