—The aim of this study was to clarify postural control in the pitch direction using a combination of the flexion angles of the root and fin tip of the pectoral fin in Mobula japanica using Three-D-Computational fluid dynamics analysis. We made Mobula models that allow flexion of the tip of the fin and the root of the fin independently. It was revealed that independent pectoral fin flexion promotes a change in the velocity distribution around the body and, as a result, the pitch moment is generated.
{"title":"Postural control in the pitch direction using flexion angles of the root and fin tip of the pectoral fin in Mobula japanica","authors":"Tomoka Shimizu, T. Miyoshi","doi":"10.5226/JABMECH.8.6","DOIUrl":"https://doi.org/10.5226/JABMECH.8.6","url":null,"abstract":"—The aim of this study was to clarify postural control in the pitch direction using a combination of the flexion angles of the root and fin tip of the pectoral fin in Mobula japanica using Three-D-Computational fluid dynamics analysis. We made Mobula models that allow flexion of the tip of the fin and the root of the fin independently. It was revealed that independent pectoral fin flexion promotes a change in the velocity distribution around the body and, as a result, the pitch moment is generated.","PeriodicalId":282365,"journal":{"name":"Journal of Aero Aqua Bio-mechanisms","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131944466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
—Formation flight control is an effective method for small unmanned air vehicles (UAVs) to improve the limited performance of an individual UAV in a powerful aggregated system as a group. In this study, formation flight control with two fixed wing airplanes as examples of UAVs were investigated based on the collective motion of organisms where simple local interactions, such as, attraction, repulsion, and parallel orientation, form an orderly motion. A control system for the aforementioned interactions was developed using a microcomputer, motion sensor, direction sensor, GPS, and communication devices and was implemented on two fixed wing type airplanes. Flight tests were conducted for the attraction-repulsion and the parallel orientation controls, and the cooperated flight of two fixed wing airplanes was successfully accomplished, indicating the feasibility of the bio-inspired formation flight control.
{"title":"Application of Bio-inspired Formation Flight Control to Two Fixed Wing Airplanes","authors":"Yoshinobu Inada, Yutaro Hayashi, Y. Koyama","doi":"10.5226/JABMECH.8.20","DOIUrl":"https://doi.org/10.5226/JABMECH.8.20","url":null,"abstract":"—Formation flight control is an effective method for small unmanned air vehicles (UAVs) to improve the limited performance of an individual UAV in a powerful aggregated system as a group. In this study, formation flight control with two fixed wing airplanes as examples of UAVs were investigated based on the collective motion of organisms where simple local interactions, such as, attraction, repulsion, and parallel orientation, form an orderly motion. A control system for the aforementioned interactions was developed using a microcomputer, motion sensor, direction sensor, GPS, and communication devices and was implemented on two fixed wing type airplanes. Flight tests were conducted for the attraction-repulsion and the parallel orientation controls, and the cooperated flight of two fixed wing airplanes was successfully accomplished, indicating the feasibility of the bio-inspired formation flight control.","PeriodicalId":282365,"journal":{"name":"Journal of Aero Aqua Bio-mechanisms","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115202525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Eguchi, Y. Aoki, S. Torisawa, K. Takehara, T. Takagi
There are few studies that compare thrust power PT induced by tail beating with net metabolic power Pnet obtained from oxygen consumption and mechanical efficiency η (= PT Pnet ) of fish thrust. In this study, PT and Pnet were obtained using two species of chub mackerel and Japanese dace, and η was calculated by comparing kinetic energy and metabolic energy. PT was calculated by multiplying swimming speed Vswim and thrust force T obtained using two calculation methods, the Milne–Thomson principle and Kutta–Joukowski theorem. Comparing each value, η showed a certain ratio irrespective of fish species and swimming speed. Linear approximation resulted in PT = 0.21 Pnet for Milne– Thomson and PT = 0.44 Pnet for Kutta–Joukowski.
{"title":"Mechanical efficiency of fish thrust induced by tail beating: comparison between kinetic energy and metabolic energy","authors":"G. Eguchi, Y. Aoki, S. Torisawa, K. Takehara, T. Takagi","doi":"10.5226/JABMECH.8.54","DOIUrl":"https://doi.org/10.5226/JABMECH.8.54","url":null,"abstract":"There are few studies that compare thrust power PT induced by tail beating with net metabolic power Pnet obtained from oxygen consumption and mechanical efficiency η (= PT Pnet ) of fish thrust. In this study, PT and Pnet were obtained using two species of chub mackerel and Japanese dace, and η was calculated by comparing kinetic energy and metabolic energy. PT was calculated by multiplying swimming speed Vswim and thrust force T obtained using two calculation methods, the Milne–Thomson principle and Kutta–Joukowski theorem. Comparing each value, η showed a certain ratio irrespective of fish species and swimming speed. Linear approximation resulted in PT = 0.21 Pnet for Milne– Thomson and PT = 0.44 Pnet for Kutta–Joukowski.","PeriodicalId":282365,"journal":{"name":"Journal of Aero Aqua Bio-mechanisms","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123776375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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