Study Of Key Problems On Force Calibration And Measurement Device

With the development of oceanographic research, higher and higher propertiesof marine flow velocity are request. The sensor not only need to measure largerlevel flow velocity, but also tiny upwelling velocity. Based on Natural ScienceFoundation “Study on Three-dimension Instantaneous Current Sensor ofMeasurable Upwelling”(No.41076061), a force calibration system forthree-dimension flow velocity sensor was developed, optimized the structure andmake it required for vertical tiny force measure.This paper first introduced the scheme of the three-dimension flow velocitysensor calibration system simply designed tiny force loading device anddisplacement worktable. Then, the force reduction mechanism was proposed, basedon flexure hinges, reducing horizontal coupling err by symmetry structures. Thismechanism applied for the principle of leverage enlargement for second reductionbased on traditional weight-pulley calibration mechanism, make use of flexiblehinge to transfer micro force and support the whole mechanism. Simplified thedesign model and analyzed the mechanics model. Through theoretical calculationand parameters simply, it is concluded that the theoretical narrow multiples. It iscompared with two commonly used flexible hinges, obtained the effect of stiffnessrelated to hinge parameters by software analysis and theoretical calculation. Thedeformation of the whole mechanism was researched in the gravitational field. It iseffectively reduced the deformation in the gravitational field by adoptcounterweight structure. The micro-force narrow multiples of two kinds of flexiblehinges to whole mechanism was researched by using numerical simulation analysissoftware. Then mechanical models of the least thickness, transitional lever and thewidth of whole mechanism were analyzed. After comprehensive analysis,micro-force generation mechanism was optimized. Force narrow multiple ofoptimized mechanism testifies the mechanism can generate steady force of μN andwas able to satisfy calibration requirements. The mechanism can be applied forkinds of situation demanding micro-force because of simple structure, convenient operation, low cost and large range and has a good prospect for the development.