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Re: [dinosaur] Caudipteryx feathered arm flapping while running (free pdf)



So the jumping origin is out of favor now?  Nice artcle.  I love the math..




On 5/2/19 3:32 PM, Ben Creisler wrote:
> Ben Creisler
> bcreisler@gmail.com
> 
> A new paper:
> 
> 
> Yaser Saffar Talori, Jing-Shan Zhao, Yun-Fei Liu, Wen-Xiu Lu, Zhi-Heng Li &
> Jingmai Kathleen O'Connor (2019)
> Identification of avian flapping motion from non-volant winged dinosaurs
> based on modal effective mass analysis.
> PLoS Computational Biology 15(5): e1006846.
> doi:  
> https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1371_journal.pcbi.1006846&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=b1QgaqdAy6N-eGlKi_i7PzaH8ZPSKJOkNIBmbpgHDds&s=RAP0dITvOZyrXi3O8eeiaHMi1Hx313qbr36M7YfEuV4&e=
> https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_ploscompbiol_article-3Fid-3D10.1371_journal.pcbi.1006846&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=b1QgaqdAy6N-eGlKi_i7PzaH8ZPSKJOkNIBmbpgHDds&s=6xyYTajd-hbzJK8hiXhJIz_RBnM04LzZKxicGfIg86U&e=
> 
> Free pdf:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_ploscompbiol_article_file-3Fid-3D10.1371_journal.pcbi.1006846-26type-3Dprintable&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=b1QgaqdAy6N-eGlKi_i7PzaH8ZPSKJOkNIBmbpgHDds&s=-QYAvUDlCts5Sx-D_eIRWr5zGbZhu1iHcw0nwVY3eig&e=
> The origin of avian flight is one of the most controversial debates in
> Paleontology. This paper investigates the wing performance of Caudipteryx,
> the most basal non-volant dinosaur with pennaceous feathered forelimbs by
> using modal effective mass theory. From a mechanical standpoint, the forced
> vibrations excited by hindlimb locomotion stimulate the movement of wings,
> creating a flapping-like motion in response. This shows that the origin of
> the avian flight stroke should lie in a completely natural process of
> active locomotion on the ground. In this regard, flapping in the history of
> evolution of avian flight should have already occurred when the dinosaurs
> were equipped with pennaceous remiges and rectrices. The forced vibrations
> provided the initial training for flapping the feathered wings of theropods
> similar to Caudipteryx.
> 
> Author summary
> The origin of avian flight in the perspective of mechanics has been
> investigated for the first time. We reported the first evidence for
> flapping hypothesis based on principle of physical modeling. This is
> significant because using modal effective mass method and reconstructed
> Caudipteryx, the most basal non-volant winged dinosaur, we captured
> significant and negligible modes and realized that resonance oscillation of
> Caudipteryx wings could occur as the running speed approached to the
> primary frequencies. Such forced vibrations induced by legs' motions during
> running trained the Caudipteryx and the other feathered dinosaurs to flap
> their wings.
> 
> News:
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencenews.org_article_dinosaur-2Drunning-2Dgait-2Dreveals-2Dinsights-2Dhistory-2Dbird-2Dflight&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=b1QgaqdAy6N-eGlKi_i7PzaH8ZPSKJOkNIBmbpgHDds&s=qxOvYPB_shfyOIPN8O3T6r8YK-GPVpTfU2xrxOiuJrE&e=
> 
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.eurekalert.org_pub-5Freleases_2019-2D05_p-2Drmh042519.php&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=b1QgaqdAy6N-eGlKi_i7PzaH8ZPSKJOkNIBmbpgHDds&s=UCO-v2Zwr9kGW7SM47-tZ6TNiQEgdDnypw28p28erFg&e=
> 
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