Scientific Papers Series B Horticulture

B, C, D and E (Pásztor J and Bratucu Gh.,2008).A(x A , y A , z A ) point’s coordinates:Where a 1 , b 1 , c 1 are the computable coefficientsfrom the actual construction data:B(x B , y B , z B ) point’s coordinates:where: r is the length of the AB element, in m; – the rotation angle of the AB element, in rad(fig,1.a.)The angle is the variable parameter:where: is the power outlet’s angular speed, inrad/s; n – the power outlet’s speed, in rot/s.Point C(x C , y C , z C ) is located at the intersectionof two circles, one with the origin in point B,having the BC radius, and the other with theorigin in point D, with the radius DC. Byresolving the system formed by the circles’equation, the C point’s coordinates reported tothe mobile reference are obtained.where: H is the height difference between theblade-bearing bar and the power outlet, in m; l– length of the BC element, in m, according tofigure 1.a. From the solutions obtained usingthe system (6) the versions corresponding togeometric restrictions are chosen.The tg expression is determined using theC(x C , y C , z C ) point’s coordinates, which isnecessary for describing the trajectory of pointsE(x E , y E , z E ) i F(x F , y F , z F ):D(x D , y D , z D ) point’s coordinates are consideredto be known are the following:Using the relations (5), the equation system (4)is modified as follows:where: b is the length of the DE element, in m;a - the blade’s length, in m, figure 1.a.RESULTS AND DISCUSSIONSThe xGz reference is considered mobile andhas a translational movement at a constantspeed, v m, reported to the xOz reference (fig, 1.b).The parametric equations reported to the xOyreference are obtained by resolving thefollowing operations:128