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With the GRC system, the evaluation can be cowhided for the straight line and the dn:ular motion with t.bo sallie Hot of eCjuations. Therefore the trajectory of a ...
Quadruped Free Gait Generation Combined with Body Trajectory Planning Shaoping Bait, K. H. Lowt and Teresa Zielinskat t School of Mechanical and Production Engineering

Nanyang Technological University, Singapore 639798 Republic of Singapore t Warsaw University of Technology

MEiL u1. Nowowiejska 24,00-665 Warsaw, Poland Abstract: A method of free gait generation

fOT both

straight line and circular body trajec tories is pr'oposed

utilizing the primary/secondary gait,

The prima""!1 gait

i s a fixed sequence of leg transfer s with mod*ed leg� ends kinematic limits according to I.he obstacle pn�­ ence, while the secondary gait

is a flexible gail,

which

ther

a

�trail!:ht. JillC(K)

or a

piece

of are.

In this paper, we

develop a free g ait algorithm combilled with th e plan­ ning of body trajectory. A mode of primar-Y/Hecondary

The pri­

gad [9J is u�ed in tho gait generation. Thee primary gait is a domillating gait that call be llsed for most of the

stability con.�traint, kinematic constmint,

when the vehicle caunot. move with the primary gait.

is generated to adjust the leg-end position.

man) gait is gener'ated consid ering the following f01l.r' constr'aint s:

ehange of hody trajeetory is rarely taken into account.

llesultantly, the body t raj ectory in these method is ei­

sequential constraint and neighboring constmints. Pri­

walking conditioIls, while the HccoJldary gait is used only

Fom constraints was elaborated to narrow the search­

mary gait parameters ar e modified by ihe influenc e of

ing scopes for I!:ait. parameters. A !!:c)lerali�ed reference

(GRC) system,

these conBt.raiuts. With

the o bs t a cle.

Using a g eneralized

refeTwee

coo1'dinate

all constraints and ob.�tacle infllLences

a1'f� expTes sed by only one set of equations despite the differ ence of motion mode.

With the pmposed method,

the ITee gait could be efficiently genemted with

consid­

eration of body trajecto1'1f planninq. Simu.lation 1'e81tlts are given to demonstra ' te th e effidency of the pmposed methodology.

coordinate (GRC) systcm is llsed ill the evaluation of

motion with t.bo

The free gait generation is an important ta..
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