Analyzing Spider-Web Structural Dynamics: An Enhanced High-Speed Camera-Based EMA Approach
摘要
Spider webs serve not only as a tool for prey capture, but also as an instrument for vibration monitoring and prey localization. The enhancements in this monitoring process, leading to greater success in prey captures, are believed to provide spiders an evolutionary advantage. It is suggested that the web serves as an extension of the spider’s central nervous system, acting as a tool for signal processing. A key characteristic of spider web design, the eccentric location of the central hub, is investigated in this research. This chapter emphasizes experimental work using a high-speed camera to capture the web’s dynamic responses, potentially increasing the understanding of the web’s extended cognition function. With the high-speed camera, full-field displacements are identified and modal parameters are estimated. The resulting full-field modal shapes demonstrate how the hub’s eccentricity affects distinct spatial modal shapes, further reinforcing the importance of eccentricity in web’s design. With a change of the prey’s position, the natural frequencies of the web change. It was shown that the maximum change in the natural frequency increases with the increase of eccentricity. The insights gained from experimentally analyzing spider webs will aid in understanding the impact of design geometry on other network-like structures.