基于分布式光纤传感技术的结构变形估计方法研究

悬臂板是广泛应用于工程实践的常见结构形式,在航空航天、轨道交通、土木工程等领域均有重要应用,其变形监测问题一直是此类领域重要的研究内容之一.本文将矩形弹性悬臂薄板纯弯曲的一般问题作为研究对象,讨论求解该问题的方法,建立应变与位移的联系,并在线弹性小变形理论框架下,得到结构横向位移的有限差分表达式;采用具有高密度应变测量...

Research on structural deformation estimation based on distributedoptical fiber sensing technology

Cantilever plates are common structures, which have been widely utilized in engineering practice, including aerospace, railtransportation, civil engineering and other fields. The deformation estimation is always one of the important research contents. This paperaims to solve the problem of bending of rectangular elastic cantilever plates and proposes a method to solve it by establishing therelationship between strain and deformation. The finite difference expression of structural transverse deformation is achieved under theframework of linearly elastic small deflection theory. The distributed optical fiber sensor with the ability of high-density strain measuringis used to obtain the strain input required for the expression, and a method of error correction for deformation measurement is proposed.The technical feasibility and measurement accuracy of structural deformation estimation based on distributed optical fiber sensingtechnology are evaluated. Some dial indicators are used in the metal cantilever bending tests. Experimental results show that themaximum deviation between results from the estimation and the dial indicators is 2. 0 mm, which accounts 9. 22% of the indication fromdial indicators. The distributed optical fiber sensing technology is competent to perform deformation estimation, which has the potentialapplication prospect.