{"title":"对称延迟对机翼垂尾的影响","authors":"Mostafa El-Salamony","doi":"10.1007/s42235-024-00604-5","DOIUrl":null,"url":null,"abstract":"<div><p>Delaying the sinusoidal plunging in the middle of the up- and down stroke is studied. This form of kinematics can appear if the flapping mechanism is malfunctioning, or while large birds fly in some cases. Aim of this study is to understand the effect of pausing the airfoil during plunging in the equilibrium position. The paused plunging is modelled mathematically by means of a sinusoidal waveform raised to the third power. Evaluation of this waveform is done on two stages; the wake pattern analysis and the aerodynamic and propulsive analysis. Studying this waveform reveals a robust way to generate two triads wake pattern instead of the regular reverse von Karman vortex wake pattern. The thrust generation mechanism is presented. The performance evaluation is done based on the thrust, lift, and power coefficients and the propulsive efficiency at different point in the nondimensional amplitude– reduced frequency space. Regression modeling methods are utilized to stand on the performance of the paused waveform with respect to the regular sinusoidal waveform. These findings underscore the potential of the proposed waveform as a promising alternative for enhancing the aerodynamic performance and propulsive efficiency in the design of Micro Air Vehicles (MAVs), a rapidly evolving field.</p></div>","PeriodicalId":614,"journal":{"name":"Journal of Bionic Engineering","volume":"21 6","pages":"2864 - 2876"},"PeriodicalIF":4.9000,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Symmetric Delay on Airfoil Plunging\",\"authors\":\"Mostafa El-Salamony\",\"doi\":\"10.1007/s42235-024-00604-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Delaying the sinusoidal plunging in the middle of the up- and down stroke is studied. This form of kinematics can appear if the flapping mechanism is malfunctioning, or while large birds fly in some cases. Aim of this study is to understand the effect of pausing the airfoil during plunging in the equilibrium position. The paused plunging is modelled mathematically by means of a sinusoidal waveform raised to the third power. Evaluation of this waveform is done on two stages; the wake pattern analysis and the aerodynamic and propulsive analysis. Studying this waveform reveals a robust way to generate two triads wake pattern instead of the regular reverse von Karman vortex wake pattern. The thrust generation mechanism is presented. The performance evaluation is done based on the thrust, lift, and power coefficients and the propulsive efficiency at different point in the nondimensional amplitude– reduced frequency space. Regression modeling methods are utilized to stand on the performance of the paused waveform with respect to the regular sinusoidal waveform. These findings underscore the potential of the proposed waveform as a promising alternative for enhancing the aerodynamic performance and propulsive efficiency in the design of Micro Air Vehicles (MAVs), a rapidly evolving field.</p></div>\",\"PeriodicalId\":614,\"journal\":{\"name\":\"Journal of Bionic Engineering\",\"volume\":\"21 6\",\"pages\":\"2864 - 2876\"},\"PeriodicalIF\":4.9000,\"publicationDate\":\"2024-11-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Bionic Engineering\",\"FirstCategoryId\":\"94\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s42235-024-00604-5\",\"RegionNum\":3,\"RegionCategory\":\"计算机科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Bionic Engineering","FirstCategoryId":"94","ListUrlMain":"https://link.springer.com/article/10.1007/s42235-024-00604-5","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
研究了在上下冲程中间延迟正弦柱塞的情况。如果拍打机构发生故障,或者在某些情况下大型鸟类飞行时,可能会出现这种运动学形式。本研究的目的是了解机翼在平衡位置急坠时暂停的影响。通过正弦波形三次幂的数学模型来模拟暂停的垂尾。对该波形的评估分为两个阶段:尾流模式分析以及气动和推进分析。通过研究这种波形,我们发现了一种产生两个三角形尾流模式而不是常规的反向 von Karman 涡流尾流模式的稳健方法。介绍了推力产生机制。性能评估基于推力、升力和功率系数,以及二维振幅缩频空间中不同点的推进效率。利用回归建模方法确定了暂停波形相对于正弦波形的性能。这些研究结果突出表明,在设计微型飞行器(MAVs)这一快速发展的领域中,所提出的波形有望成为提高气动性能和推进效率的替代方案。
Delaying the sinusoidal plunging in the middle of the up- and down stroke is studied. This form of kinematics can appear if the flapping mechanism is malfunctioning, or while large birds fly in some cases. Aim of this study is to understand the effect of pausing the airfoil during plunging in the equilibrium position. The paused plunging is modelled mathematically by means of a sinusoidal waveform raised to the third power. Evaluation of this waveform is done on two stages; the wake pattern analysis and the aerodynamic and propulsive analysis. Studying this waveform reveals a robust way to generate two triads wake pattern instead of the regular reverse von Karman vortex wake pattern. The thrust generation mechanism is presented. The performance evaluation is done based on the thrust, lift, and power coefficients and the propulsive efficiency at different point in the nondimensional amplitude– reduced frequency space. Regression modeling methods are utilized to stand on the performance of the paused waveform with respect to the regular sinusoidal waveform. These findings underscore the potential of the proposed waveform as a promising alternative for enhancing the aerodynamic performance and propulsive efficiency in the design of Micro Air Vehicles (MAVs), a rapidly evolving field.
期刊介绍:
The Journal of Bionic Engineering (JBE) is a peer-reviewed journal that publishes original research papers and reviews that apply the knowledge learned from nature and biological systems to solve concrete engineering problems. The topics that JBE covers include but are not limited to:
Mechanisms, kinematical mechanics and control of animal locomotion, development of mobile robots with walking (running and crawling), swimming or flying abilities inspired by animal locomotion.
Structures, morphologies, composition and physical properties of natural and biomaterials; fabrication of new materials mimicking the properties and functions of natural and biomaterials.
Biomedical materials, artificial organs and tissue engineering for medical applications; rehabilitation equipment and devices.
Development of bioinspired computation methods and artificial intelligence for engineering applications.