tailieunhanh - Advanced Robotics - Control of Interactive Robotic Interfaces Volume 29 Part 9

Tham khảo tài liệu 'advanced robotics - control of interactive robotic interfaces volume 29 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A Digital Scheme for Intrinsically Passive Telemanipulation 147 SLAVE powerfingerlvirtual mass time s SLAVE powerfinger2virtual mass w 0 0 50 100 150 time s time s Fig. . The power at slave side time s the two devices assume the same configuration because of the energy reflected from the slave side. A Digital Scheme for Intrinsically Passive Telemanipulation The intrinsically passive port-Hamiltonian based telemanipulation scheme proposed in Sec. considers continuous time port-Hamiltonian controllers and communication channels characterized by a constant delay. In this section we show how to extend the scheme in order to take into account the digital nature of controllers. Furthermore since a very appealing and cheap communication channel is the Internet the energetic behavior of a packet switching transmission line is studied. There are two main problems to address the strongly variable time delay and the possible unreliability due to the loss of packets associated with the channel. The sampled data nature of the controllers can be considered by using the concepts described in Sec. . In fact we can use the discretization algorithm reported in Sec. in order to obtain a discrete port-Hamiltonian controller and to interconnect it by means of the energetic consistent Sample Hold strategy described in Sec. to the continuous plant. Since now the con- 148 4 Port-Hamiltonian Based Bilateral Telemanipulation MASTER Fingers position SLAVE Fingers position Fig. . Position of the fingers in a grasp. trailers connected to the transmission line are discrete we have to consider a digital transmission line . Internet through which master and slave sides will exchange energy. The proposed scheme is illustrated in Fig. in a bond-graph notation. The symbols D and IR represent the energy storing and energy dissipating part of each port-Hamiltonian system both for the continuous plant and for the discrete controller.

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