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Torsion and transverse sensing of conical shells

机译：圆锥壳的扭转和横向传感

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Conical shells are widely used as payload/rocket adapters in rocket fairing systems. Generally, the conical shells are clamped at the major end and free at the minor end, where the payload is mounted. This study focuses on the dynamic sensing of conical shells with fix-free boundary conditions (BCs) by using distributed piezoelectric helical sensors. Two types of motion are studied, i.e., the transverse modes and the torsion modes. The shear-type sensors for shells sensing are presented first. Formulations of sensing signals of a general shell of revolution are presented, and then simplified to conical shells. For sensing of transverse vibrations, thin piezoelectric sensors are laminated on the top surface. Two types of sensor distribution are considered: a fully distributed and a helical or diagonal laminated. The total signal consists of four components resulting from the four strain components, and each of them is evaluated in detail. For sensing of torsion vibrations, a meridional polarized shear-type sensor with side electrodes is layered on the top surface of the shell structure. Sensing signals of natural shell modes are also evaluated. Analyses show that, in low order modes, the sensing signals induced by the circumferential membrane strains are the primary components of the total signal generations. The numerical results indicate the optimal location of the sensors. The proposed method is capable of determining the modal participation factors, while the testing signal is available; it is also capable of determining the mode shapes by using several distributed sensor segments.
机译：圆锥形外壳被广泛用作火箭整流罩系统中的有效载荷/火箭适配器。通常，圆锥形外壳在安装有有效载荷的顶端处被夹紧，而在顶端处被夹紧。这项研究的重点是通过使用分布式压电螺旋传感器动态检测具有无固定边界条件（BCs）的圆锥壳。研究了两种类型的运动，即，横向模式和扭转模式。首先介绍用于壳感测的剪切型传感器。介绍了一般旋转壳体的感测信号的公式，然后将其简化为圆锥形壳体。为了检测横向振动，将薄的压电传感器层压在顶面上。考虑两种类型的传感器分布：完全分布和螺旋或对角线层压。总信号由四个应变分量产生的四个分量组成，并对每个信号进行详细评估。为了检测扭转振动，在壳体结构的顶面上分层放置了一个带有侧电极的经向极化剪切型传感器。还评估了自然壳模式的传感信号。分析表明，在低阶模式下，由周向膜应变感应的传感信号是总信号产生的主要成分。数值结果表明传感器的最佳位置。所提出的方法能够确定模态参与因子，同时可以得到测试信号。它也能够通过使用多个分布式传感器段来确定模式形状。

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