The article analyzes the composition of the Rotating Laser vertical error based on the vertical plane working principle of the rotating laser and build a three-dimensional coordinate system based on a vertical plane established by optical axes of two collimators which is symmetrically distributed in ±β° relative to horizontal axis. Using the sine and cosine theorems of spherical triangles, the formula of the inclination error of the vertical level plane of the rotating laser is deduced. Using the formation characteristics of cone-angle error, the formula of cone-angle error of horizontal level plane is used as of vertical rotating plane. Finally, we build a mathematical model of the vertical error
This paper presents the concept design, preliminary experimental validation, and performance evaluation of a novel bio-inspired bi-stable piezoelectric energy harvester for self-powered fish telemetry tags. The self-powered fish tag is designed to externally deploy on fish (dorsal fin) to track and monitor fish habitats, population, and underwater environment, meanwhile, harvests energy from fish motion and surrounding fluid flow for a sustainable power supply. Inspired by the rapid shape transition of the Venus flytrap, a bi-stable piezoelectric energy harvester is developed to generate electricity from broadband excitation of fish maneuvering and fluid. A bluff body is integrated to the free end of the bistable piezoelectric energy harvester to enhance the structure-fluid interaction for the large-amplitude snap-through vibrations and higher voltage output. Controlled laboratory experiments are conducted in a water tank on the bio-inspired bi-stable piezoelectric energy harvester using a servo motor system to simulate fish swing motion at various conditions to evaluate the power generation performance. The preliminary underwater experimental results demonstrated that the proposed bio-inspired bi-stable piezoelectric effectively converters fish swing motions into electricity. The average power output of 1.5 mW was achieved at the swing angle of 30° and frequency of 1.6 Hz.
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