ANNEXE C Modèle mathématique du robot lego NXT
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1 ANNEXE C Modèe athéatique du oot ego NX tié de a otice NXay-GS Mode-Based Desig - Coto of sef-aacig to-heeed oot uit ith LEGO Midstos NX, Yoihisa Yaaoto.
2 3 NXay-GS Modeig his chapte descies atheatica ode ad otio equatios of NXay-GS. 3. o-heeed Iveted Peduu Mode NXay-GS ca e cosideed as a to heeed iveted peduu ode sho i igue 3-. D H igue 3- o-heeed iveted peduu igue 3- shos side vie ad pae vie of the to heeed iveted peduu. he coodiate syste used i 3. Motio Equatios of o-heeed Iveted Peduu is descied i igue 3-. z y z M, L H y y, y, y z, x x x x x : ody pitch age : hee age ( idicates eft ad ight,,, : DC oto age igue 3- Side vie ad pae vie of to-heeed iveted peduu - 6 -
3 Physica paaetes of NXay-GS ae the fooig. g 9.8 [ / sec ] 0.03 [kg] 0.04 [] : Gavity acceeatio : hee eight : hee adius [ kg ] : hee ietia oet M 0.6 [kg] 0.4 [] D 0.04 [] H 0.44 [] : Body eight : Body idth : Body depth : Body height L H [] : Distace of the cete of ass fo the hee axe ML 3 [ kg ] : Body pitch ietia oet ( D M [ kg ] : Body ya ietia oet 5 0 [ kg ] 6.69 [Ω] : DC oto ietia oet : DC oto esistace K [ V sec ad ] : DC oto ack EM costat K 0.37 [ N A] : DC oto toque costat t : Gea atio f 0.00 : ictio coefficiet etee ody ad DC oto f 0 : ictio coefficiet etee hee ad foo. e use the vaues descied i efeece [] fo, K, K. e use the vaues that sees to e appopiate fo,, f, f, ecause it is difficut to easue. t 3. Motio Equatios of o-heeed Iveted Peduu e ca deive otio equatios of to-heeed iveted peduu y the Lagagia ethod ased o the coodiate syste i igue 3-. If the diectio of to-heeed iveted peduu is x-axis positive diectio at t 0, each coodiates ae give as the fooig., (3. ( ( ( ( x y, z ( x dt, y dt, ( x, y ( cos si,, ( x, y, z x si, y cos, z ( x, y, z x si, y cos, z (3. (3.3 (3.4 ( x, y, z ( x Lsi cos, y Lsi si, z Lcos (
4 he tasatioa kietic eegy, the otatioa kietic eegy, the potetia eegy U ae ( y z ( x y z M ( x y z x (3.6 ( ( (3.7 U gz gz Mgz (3.8 he fifth ad sixth te i Lagagia L has the fooig expessio. ae otatio kietic eegy of a aatue i eft ad ight DC oto. he L U (3.9 e use the fooig vaiaes as the geeaized coodiates. : Aveage age of eft ad ight hee : Body pitch age : Body ya age Lagage equatios ae the fooig d dt d dt d dt L L L L L L (3.0 (3. (3. e deive the fooig equatios y evauatig Eqs. (3.0 - (3.. [( M ] ( ML cos ML si (3.3 ( ML cos ( ML MgL si ML si cos (3.4 ( ML si ML si cos (
5 I cosideatio of DC oto toque ad viscous fictio, the geeaized foces ae give as the fooig (,,, (, (3.6 K ti f ( f (3.7 K ti f ( f (3.8 K i K i f f ( (3.9 t t ( hee i, is the DC oto cuet. e caot use the DC oto cuet diecty i ode to coto it ecause it is ased o PM (votage coto. heefoe, e evauate the eatio etee cuet ad votage usig DC oto equatio. If the fictio iside the oto is egigie, the DC oto equatio is geeay as foos i, v, L i, v, K (, i, (3.0 Hee e coside that the oto iductace is egigie ad is appoxiated as zeo. heefoe the cuet is i, v, K (, (3. o Eq.(3., the geeaized foce ca e expessed usig the oto votage. ( v ( v f ( v v (3. (3.3 f K ( v v ( K K (3.4 t t, f (
6 State Equatios of o-heeed Iveted Peduu e ca deive state equatios ased o ode coto theoy y ieaizig otio equatios at a aace poit of NXay-GS. It eas that e coside the iit 0 ( si, cos ad egect the secod ode te ike. he otio equatios (3.3 (3.5 ae appoxiated as the fooig ( [ ] ( ML M (3.6 ( ( MgL ML ML (3.7 ( (3.8 Eq. (3.6 ad Eq. (3.7 has ad, Eq. (3.8 has oy. hese equatios ca e expessed i the fo v v H G E (3.9 ( H MgL G f ML ML ML M E ( v v K I (3.30 ( ( K f I
7 Hee e coside the fooig vaiaes x, as state, ad u as iput. x idicates taspose of x. x [,,, ], x [, ], [ v, v ] u (3.3 x Cosequety, e ca deive state equatios of to-heeed iveted peduu fo Eq. (3.9 ad Eq. (3.30. A x u (3.3 x B A x u (3.33 x B A , B ( A (3, (3,3 (3,4 (3 (3 A A B B 0 A (4, A (4,3 A (4,4 B (4 B (4 A 0 0, I B 0 K 0 I K I (3.35 A (3, gmle(, det( E A (4, gmle(, det( E A (3,3 A (4,3 A (3,4 A (4,4 B (3 B (4 [ ( f E(, E(, ] [ ( f E(, E(, ] [ E(, E(, ] det( E [ E(, E(, ] det( E [ E(, E(, ] det( E [ E(, E(, ] det( E det( E E(, E(, E(, det( E det( E - -
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