Yaser Saffar Talori
Tsinghua University
Publications 5
#1Yaser Saffar Talori (THU: Tsinghua University)
#2Jing-Shan Zhao (THU: Tsinghua University)H-Index: 15
This study explores the aerodynamic capacity of feathered forelimbs of Caudipteryx, the most basal non-volant maniraptoran dinosaur, with particular focus on flapping during terrestrial locomotion on a flat, horizontal substrate. In order to seek this subject, Caudipteryx and its wings have been modeled theoretically based on measuring the fossil data of Caudipteryx (IVPP V12344 and IVPP V12430). We divided the wings into various elements to enhance the analysis accuracy, and lift and thrust for...
#1Yaser Saffar Talori (THU: Tsinghua University)
#2Jing-Shan Zhao (THU: Tsinghua University)
Last.Jingmai K. O'Connor (CAS: Chinese Academy of Sciences)H-Index: 22
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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 nat...
#1Yaser Saffar Talori (THU: Tsinghua University)
#2Yun-Fei Liu (THU: Tsinghua University)
Last.Zhiheng Li (CAS: Chinese Academy of Sciences)H-Index: 8
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Pennaceous feathers capable of forming aerodynamic surfaces are characteristic of Pennaraptora, the group comprising birds and their closest relatives among non-avian dinosaurs. However, members of the basal pennaraptoran lineage Oviraptorosauria were clearly flightless, and the function of pennaceous feathers on the forelimb in oviraptorosaurs is still uncertain. In the basal oviraptorosaur Caudipteryx both the skeleton and the plumage, which includes pennaceous feathers forming wing-like arran...
#1Jing-Shan Zhao (THU: Tsinghua University)
#2Yaser Saffar Talori (THU: Tsinghua University)
view all 4 authors...
This study seeks to better quantify the parameters that drove the evolution of flight from non-volant winged dinosaurs to modern birds. In order to explore this issue, we used fossil data to model the feathered forelimb of Caudipteryx, the most basal non-volant maniraptoran dinosaur with elongate pennaceous feathers that could be described as forming proto-wings. In order to quantify the limiting flight factors, we created three hypothetical wing profiles for Caudipteryx representing incremental...
#1Yaser Saffar Talori (THU: Tsinghua University)
#2Jing-Shan Zhao (THU: Tsinghua University)
A fundamental way to quantify the origin of flight is the implementation of experiments on the running bipedal with/without flapping wings in order to capture the kinematics of a bird quantitatively. To this purpose, the measured parameters should be the body rolling and the amplitude of flapping accompanied by running, while the wings can be folded and unfolded in a certain angle of attack. Here, we show the analysis and synthesis of a testrig-based bionic robot using screw theory. This paper i...