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Significance of the Asymmetry of the Haltere: A Microscale Vibratory Gyroscope
Applied Bionics and Biomechanics ( IF 2.2 ) Pub Date : 2020-11-20 , DOI: 10.1155/2020/8647137
Rizuwana Parween 1
Affiliation  

Nature has evolved a beautiful design for small-scale vibratory gyroscopes in the form of halteres located in the metathorax region of the dipteran flies that detect body rotations based on the Coriolis principle. The specific design of the haltere is in contrast to the existing MEMS vibratory gyroscope, where the elastic beams supporting the proof mass are typically designed with symmetric cross-sections so that there is a mode matching between the actuation and sensing vibrations. The mode matching provides high sensitivity and low bandwidth. Hence, the objective of the manuscript is to understand the mechanical significance of the haltere’s asymmetry. In this study, the distributed Coriolis force and the corresponding bending stress by incorporating the actual mass variations along the haltere length are estimated. In addition, it is hypothesied that sensilla sense the rate of rotation based on the differential strain (difference between the final strain (strain due to the inertial and Coriolis forces) and the reference strain (strain due to inertial force)). This differential strain always occurs either on the dorsal or ventral surface of the haltere and at a distance away from the base, where the campaniform sensilla are located. This study brings out one specific feature—the asymmetric geometry of the haltere structure—that is not found in current vibratory gyroscope designs. This finding will inspire new designs of MEMS gyroscopes that have elegance and simplicity of the haltere along with the desired performance.

中文翻译:

三角背心不对称的意义:微型振动陀螺仪

大自然已经开发出了一种小型振动陀螺仪的精美设计,其形式是位于the足蝇的后胸部区域的三角裤,它们根据科里奥利原理检测身体的旋转。吊带袜的特殊设计与现有的MEMS振动陀螺仪形成对比,后者的支撑检测质量的弹性梁通常设计成具有对称的横截面,从而在激励和感测振动之间存在模式匹配。模式匹配可提供高灵敏度和低带宽。因此,手稿的目的是了解吊袜带不对称的机械意义。在这项研究中,通过结合沿吊笼长度的实际质量变化来估计分布的科里奥利力和相应的弯曲应力。此外,假设sensilla基于差分应变(最终应变(由于惯性力和科里奥利力引起的应变)与参考应变(由于惯性力引起的应变)之间的差)来感测旋转速度。这种差异应变总是发生在三角裤的背侧或腹侧表面上,并且距坎帕尼形感应器所在的基部一定距离。这项研究提出了一个特定的特征-hal形结构的不对称几何形状-在当前的振动陀螺仪设计中没有发现。这一发现将启发MEMS陀螺仪的新设计,该设计具有吊笼的优雅和简单性以及所需的性能。
更新日期:2020-11-21
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