Based on the analysis of movement characteristics of gauge disc cutter in cutterhead of tunneling machine, the motion equation to describe the working behavior of the edge point of gauge disc cutter in tunneling process is deduced by using the method of space coordinate transformation matrix. The motion equation has the advantages of considering more parameters, such as position variables of disc cutter, cutter radius, cutterhead rotating speed and advance speed.
Coordinate transformation is an emerging field which offers a powerful and unprecedented ability to manipulate and control electromagnetic waves. Using this tool, we demonstrate the design of novel antenna concepts by tailoring their radiation properties. The wave manipulation is enabled through the use of engineered dispersive composite metamaterials that realize the space coordinate transformation. Three types of antennas are considered for design: a directive, a beam steerable and a quasi-isotropic one. Numerical simulations together with experimental measurements are performed in order to validate the coordinate transformation concept. Near-field cartography and far-field pattern measurements performed on a fabricated prototype agree qualitatively with Finite Element Method (FEM) simulations. It is shown that a particular radiation pattern can be tailored at ease into a desired one by modifying the electromagnetic properties of the space around radiator. This idea opens the way to novel antenna design techniques for various application domains such as the aeronautical and transport fields.
Based on the analysis of movement characteristics of inner disc cutter in tunneling machine cutterhead, a trajectory equation to describe the motion behavior of working edge point of inner disc cutter in the process of tunneling is derived by using the method of space coordinate transformation matrix. The trajectory equation mainly considers the parameters of position variables of disc cutter, cutter radius, cutterhead rotating speed and advance speed.
This paper studies the problem of multi-joint robot with four degrees of freedom that is used in the process of loading and unloading, the method of homogeneous coordinate transformation is used to achieve the exchange between the implementation end of the space coordinate and the joint angle. Providing the theoretical reference and a basis of calculating for the follow-up study, and ultimately meeting the actual needs of production.
Test Frequency Selection of Analog Circuit Based on Discrete Particle Swarm Algorithm