Giant magnetostrictive material can generate about 1600 ppm strain, and with the solid-state deformation principle it has the potential to render high force and precise displacement with a small volume, which makes it suitable to realize efficient miniature actuators. We have developed an inchworm linear motion mini actuator (50 × 30 × 30 mm) which is required to position an object over a range of some millimeters with nanometer resolution. An analytical model has been established for step displacement in quasi-static conditions, depending nonlinearly on both the magnetic excitation and the mechanical prestress exerted on the rod. Tests with the actuator prototype show that it can move on a flat surface with a velocity of 97.2 µm s−1 and a positioning resolution of up to 4 nm.
Summary
Agricultural products logistics finance warehouse business mainly includes three parties: agricultural production and processing enterprises and the third‐party logistics enterprises and financial institutions, to allow three parties to achieve a win‐win situation; in this paper, the evolutionary game theory is used to construct the evolutionary game model of three‐party selection different strategies and, through the construction of replicated dynamic equation, solving the evolution stable strategy. At last, based on the evolutionary stable point, the paper analyzes the strategies of agricultural production and processing enterprises, the third‐party logistics enterprises and financial institutions, and gives the feasible suggestions to the three‐party strategy. Realization of agricultural products logistics finance warehouse profit model three‐party mutual benefit and win‐win, so as to promote the smooth development of agricultural products logistics financial business, ensure the cooperation and common development of agricultural production and processing enterprises and the third‐party logistics enterprises.
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