A bio-inspired system to detect string vibration (ICCAS 2013)

In the many animals that are able to sense the vibration, the spider have silt organ that can detect vibrations on the each leg. They have ability of making spider web and have detection and localization of prey using vibration sensing organ. For study the spiders web's structure, we make a vibration sensor for experiment of spider web vibration and the artificial web strings on the rectangular aluminum frame. The vibration sensor consist of the hall magnetic sensor that can be measure magnetic field strength. In the experiment of the artificial web, it is shown that the orientation detecting system using the difference of vibration magnitude is better than the difference of vibration arrival time. And the transverse vibration has lower attenuation than the longitudinal vibration. It is also known that the spider's web has a function as structural band pass filter. If the string is added on the spider webs, this function of the band pass filter has the lower band-width. Through the experiment, it is known that the result that the frequency and magnitude of horizontal is similar to the frequency and magnitude of transverse When the position of vertical string move to near the center. And we obtain the result of the beat effect and verify that the vibration sensor is enough to measure the string vibration.