TAILIEUCHUNG - Robot Manipulator Control Theory and Practice - Frank L.Lewis Part 2

Tham khảo tài liệu 'robot manipulator control theory and practice - frank part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 24 Introduction to Control Theory A more compact formulation of and is given by x t Ax t 4- bu t y t exit 4- du t where 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0-0 -ai -a2 2 1 0 0 0 0 0 1 0 bl ỉ 2 bn 2 bn-1 d bn. This particular state-space representation is known as the controllable canonical form Kailath 1980 Antsaklis and Michel 1997 . In general a linear time-invariant continuous-time system will have more than one input and one output. In fact u t is an mx1 vector and y t is a px1 vector. The differential equations relating u t to y t will not be presented here but the state-space representation of the multi-input multi-output MIMO system becomes i t Ax t 4- Bu t y t Cx t 4- Du t where A is nxn B is nxm C is pxn and D is pxm. For the specific forms of A B C and D the reader is again referred to Kailath 1980 Antsaklis and Michel 1997 . A block diagram of is shown in Figure . Note that the minimal number of states is equal to the required number of initial conditions in order to find a unique solution to the set of differential equations. Copyright 2004 by Marcel Dekker Inc. 26 Introduction to Control Theory EXAMPLE Two-Platform System Consider the MIMO mechanical system shown in Figure which represents a 2 platform system used to isolate experiments from external disturbances. There are 2 inputs to the system given by u2 which causes the ground to move and U1 which causes the platform m1 to move. The system also has 2 outputs namely the motion y1 of platform m1 and the motion y2 of platform m2. The experiments will be conducted on top of platform m1 and therefore one would like to minimize the size of y1. The differential equations describing this system are obtained using Newton s second law A state-space formulation of this system can be obtained by choosing 1 yi a 2 ýi x3 2 2 z4 ỹ2 x5 y3 xe y3 0 0 1 0 X -1- zni 0 0 0 0 0 0 _ 0 1 Transfer Functions Another equivalent representation of linear .

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