{"id":807,"date":"2024-10-09T14:34:48","date_gmt":"2024-10-09T05:34:48","guid":{"rendered":"https:\/\/www.kikulab.it-chiba.ac.jp\/Eng\/?page_id=807"},"modified":"2026-02-24T19:49:43","modified_gmt":"2026-02-24T10:49:43","slug":"diving-beetle-project","status":"publish","type":"page","link":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/research\/aerial-aquatic-locomotion-robot\/diving-beetle-project\/","title":{"rendered":"Diving Beetle Project"},"content":{"rendered":"<div data-colibri-id=\"807-c1\" class=\"style-450 style-local-807-c1 position-relative\">\n  <!---->\n  <div data-colibri-component=\"section\" data-colibri-id=\"807-c2\" id=\"initial-content\" class=\"h-section h-section-global-spacing d-flex align-items-lg-center align-items-md-center align-items-center style-451 style-local-807-c2 position-relative\">\n    <!---->\n    <!---->\n    <div class=\"h-section-grid-container h-section-boxed-container\">\n      <!---->\n      <div data-colibri-id=\"807-c3\" class=\"h-row-container gutters-row-lg-2 gutters-row-md-2 gutters-row-0 gutters-row-v-lg-2 gutters-row-v-md-2 gutters-row-v-2 style-460 style-local-807-c3 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-2 gutters-col-md-2 gutters-col-0 gutters-col-v-lg-2 gutters-col-v-md-2 gutters-col-v-2\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-461-outer style-local-807-c4-outer\">\n            <div data-colibri-id=\"807-c4\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-461 style-local-807-c4 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c5\" class=\"h-text h-text-component style-462 style-local-807-c5 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>To develop an insect-scale aerial\/aquatic robot, we are investigating diving beetle&#8217;s swim, flight, and especially takeoff from water surface. Only a diving beetle, <em>Eretes griseus<\/em>, counteracts the surface tension and can take\n                      off directly from the water surface. For <em>mm<\/em>-scale insects, since the surface tension force may become 10 times greater than own weight, a diving beetle uses technically leg paddling, wing slapping, and clap-and-fling &#8211;the\n                      wing surfaces directly contact each other at stroke reversal and are peeled&#8211;. Additionally, the water surface effect with ripple or wave unlike ground effect, Meniscus wall break, foldable\/deployable wings and&nbsp;protective forewings\n                      (Elytra) are attractive for small robots. A diving beetle never ceases to fascinate researchers like us.<\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"807-c6\" class=\"h-row-container gutters-row-lg-1 gutters-row-md-1 gutters-row-0 gutters-row-v-lg-1 gutters-row-v-md-1 gutters-row-v-1 style-455 style-local-807-c6 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-1 gutters-col-md-1 gutters-col-0 gutters-col-v-lg-1 gutters-col-v-md-1 gutters-col-v-1\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-456-outer style-local-807-c7-outer\">\n            <div data-colibri-id=\"807-c7\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-1 h-px-md-1 h-px-1 v-inner-lg-1 v-inner-md-1 v-inner-1 style-456 style-local-807-c7 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-component=\"video\" data-colibri-id=\"807-c8\" class=\"d-block h-video d-block h-video style-457 style-local-807-c8 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"video-container position-relative\">\n                    <div class=\"h-global-transition-all ratio-inner\"><iframe src=https:\/\/www.youtube.com\/embed\/oA8Agaj3o_A?autoplay=0&#038;mute=0&#038;modestbranding=0&#038;rel=0&#038;enablejsapi=1&#038; class='h-video-main'  allowfullscreen><\/iframe><\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-459-outer style-local-807-c10-outer\">\n            <div data-colibri-id=\"807-c10\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-1 h-px-md-1 h-px-1 v-inner-lg-1 v-inner-md-1 v-inner-1 style-459 style-local-807-c10 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-component=\"video\" data-colibri-id=\"807-c11\" class=\"d-block h-video d-block h-video style-464 style-local-807-c11 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"video-container position-relative\">\n                    <div class=\"h-global-transition-all ratio-inner\"><iframe src=https:\/\/www.youtube.com\/embed\/IYc2gGnNl4Y?autoplay=0&#038;mute=0&#038;modestbranding=0&#038;rel=0&#038;enablejsapi=1&#038; class='h-video-main'  allowfullscreen><\/iframe><\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-463-outer style-local-807-c13-outer\">\n            <div data-colibri-id=\"807-c13\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-1 h-px-md-1 h-px-1 v-inner-lg-1 v-inner-md-1 v-inner-1 style-463 style-local-807-c13 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c14\" class=\"h-text h-text-component style-675 style-local-807-c14 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>Direct takeoff from the water surface:<\/p>\n                    <p>Sutter speed: 1\/1000 [s]<\/p>\n                    <p>Frame per second: 1000<\/p>\n                    <p>Resolution: 1280 * 1024 pixels<\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"807-c15\" class=\"h-row-container gutters-row-lg-0 gutters-row-md-0 gutters-row-0 gutters-row-v-lg-0 gutters-row-v-md-0 gutters-row-v-0 style-1269 style-local-807-c15 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-0 gutters-col-md-0 gutters-col-0 gutters-col-v-lg-0 gutters-col-v-md-0 gutters-col-v-0\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-1270-outer style-local-807-c16-outer\">\n            <div data-colibri-id=\"807-c16\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-0 h-px-md-0 h-px-0 v-inner-lg-0 v-inner-md-0 v-inner-0 style-1270 style-local-807-c16 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c17\" class=\"d-block style-1272 style-local-807-c17 position-relative h-element\">\n                  <!---->\n                  <div class=\"h-image__frame-container-outer\">\n                    <div class=\"h-image__frame-container\">\n                      <!---->\n                      <!---->\n                      <img loading=\"lazy\" decoding=\"async\" width=\"944\" height=\"133\" src=\"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2025\/08\/DivingBeetle02.png\" class=\"wp-image-3511 style-1272-image style-local-807-c17-image\" alt=\"\" \/>\n                      <div class=\"h-image__frame h-hide-lg h-hide-md h-hide-sm style-1272-frameImage style-local-807-c17-frameImage\"><\/div>\n                    <\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-1273-outer style-local-807-c18-outer\">\n            <div data-colibri-id=\"807-c18\" class=\"d-flex h-flex-basis h-column__inner h-ui-empty-state-container h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-1273 style-local-807-c18 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100\">\n                <!---->\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"807-c19\" class=\"h-row-container gutters-row-lg-2 gutters-row-md-2 gutters-row-0 gutters-row-v-lg-2 gutters-row-v-md-2 gutters-row-v-2 style-676 style-local-807-c19 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-2 gutters-col-md-2 gutters-col-0 gutters-col-v-lg-2 gutters-col-v-md-2 gutters-col-v-2\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-677-outer style-local-807-c20-outer\">\n            <div data-colibri-id=\"807-c20\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-677 style-local-807-c20 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c21\" class=\"d-block style-678 style-local-807-c21 position-relative h-element\">\n                  <!---->\n                  <div class=\"h-image__frame-container-outer\">\n                    <div class=\"h-image__frame-container\">\n                      <!---->\n                      <!---->\n                      <img loading=\"lazy\" decoding=\"async\" width=\"458\" height=\"699\" src=\"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle01.png\" class=\"wp-image-1411 style-678-image style-local-807-c21-image\" alt=\"\" srcset=\"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle01.png 458w, https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle01-197x300.png 197w\" sizes=\"auto, (max-width: 458px) 100vw, 458px\" \/>\n                      <div class=\"h-image__frame h-hide-lg h-hide-md h-hide-sm style-678-frameImage style-local-807-c21-frameImage\"><\/div>\n                    <\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-679-outer style-local-807-c22-outer\">\n            <div data-colibri-id=\"807-c22\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-679 style-local-807-c22 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c23\" class=\"h-text h-text-component style-683 style-local-807-c23 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>CFD simulation (Hashimoto 2023):<\/p>\n                    <p>Velocity distribution (left) and pressure contour surfaces (right) during clap-and-fling near the water surface. The leading edge vortex (LEV) was strengthened by the flapping near the water surface and the wave expanded along with\n                      the wing motion.<\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"807-c24\" class=\"h-row-container gutters-row-lg-2 gutters-row-md-2 gutters-row-0 gutters-row-v-lg-2 gutters-row-v-md-2 gutters-row-v-2 style-684 style-local-807-c24 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-2 gutters-col-md-2 gutters-col-0 gutters-col-v-lg-2 gutters-col-v-md-2 gutters-col-v-2\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-685-outer style-local-807-c25-outer\">\n            <div data-colibri-id=\"807-c25\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-685 style-local-807-c25 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c26\" class=\"d-block style-686 style-local-807-c26 position-relative h-element\">\n                  <!---->\n                  <div class=\"h-image__frame-container-outer\">\n                    <div class=\"h-image__frame-container\">\n                      <!---->\n                      <!---->\n                      <img loading=\"lazy\" decoding=\"async\" width=\"452\" height=\"640\" src=\"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle00.png\" class=\"wp-image-1395 style-686-image style-local-807-c26-image\" alt=\"\" srcset=\"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle00.png 452w, https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-content\/uploads\/2024\/10\/divingBeetle00-212x300.png 212w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/>\n                      <div class=\"h-image__frame h-hide-lg h-hide-md h-hide-sm style-686-frameImage style-local-807-c26-frameImage\"><\/div>\n                    <\/div>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-687-outer style-local-807-c27-outer\">\n            <div data-colibri-id=\"807-c27\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-687 style-local-807-c27 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c28\" class=\"h-text h-text-component style-688 style-local-807-c28 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>CFD simulation (Hashimoto 2023):<\/p>\n                    <p>Comparison of velocity distributions on the \ud835\udc4c = \u221213.5 mm plane: (a) near and (b) far from the water surface. Water surface level changed with wing motion, and subsequently the ground effect also changed. When the wing accelerated,\n                      the effect was prominent. The TEV stayed on the water surface in the condition that the water surface exists.<\/p>\n                    <p>CFD: openFOAM(overInterDyMFoam), VOF, overset mesh, moving boundary condition,&nbsp;<\/p>\n                    <p>Note that the dynamic contact angle algorithm was included.<\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"807-c29\" class=\"h-row-container gutters-row-lg-2 gutters-row-md-2 gutters-row-0 gutters-row-v-lg-2 gutters-row-v-md-2 gutters-row-v-2 style-680 style-local-807-c29 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-2 gutters-col-md-2 gutters-col-0 gutters-col-v-lg-2 gutters-col-v-md-2 gutters-col-v-2\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-681-outer style-local-807-c30-outer\">\n            <div data-colibri-id=\"807-c30\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-681 style-local-807-c30 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"807-c31\" class=\"h-text h-text-component style-682 style-local-807-c31 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <h6>References:<\/h6>\n                    <p>.&nbsp;\n                      <a href=\"https:\/\/www.fujipress.jp\/jrm\/rb\/robot003600051122\" style=\"color: rgb(102, 102, 102); font-family: &quot;Open Sans&quot;; font-size: 16px; font-weight: 400;\" class=\"customize-unpreviewable\">Noa HASHIMOTO, Rui SUZUKI, and Koki KIKUCHI: CFD Analysis of Takeoff from a Water Surface for an Insect-scale Aerial\/Aquatic Robot, JRM, Vol.36, No.5, (2024), <\/a>pp.1122-1133,&nbsp;\n                      <a href=\"https:\/\/www.fujipress.jp\/jrm\/rb\/robot003600051122\"\n                        style=\"color: rgb(102, 102, 102); font-family: &quot;Open Sans&quot;; font-size: 16px; font-weight: 400;\" class=\"customize-unpreviewable\">J-stage.<\/a>\n                    <\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>To develop an insect-scale aerial\/aquatic robot, we are investigating diving beetle&#8217;s swim, flight, and  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":522,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/full-width-page.php","meta":{"footnotes":""},"class_list":["post-807","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/pages\/807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/comments?post=807"}],"version-history":[{"count":20,"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/pages\/807\/revisions"}],"predecessor-version":[{"id":4105,"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/pages\/807\/revisions\/4105"}],"up":[{"embeddable":true,"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/pages\/522"}],"wp:attachment":[{"href":"https:\/\/www.kikulab.chibatech.ac.jp\/Eng\/wp-json\/wp\/v2\/media?parent=807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}