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Artykuły w czasopismach na temat „Vertical tail”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 29 stycznia 2023

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1

PRISACARIU, Vasile, and Alexandru CHIRILĂ. "AERODINAMIC ANALYSIS OF HELICOPTER FENESTRON VERTICAL TAIL." SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 21, no. 1 (October 8, 2019): 176–83. http://dx.doi.org/10.19062/2247-3173.2019.21.24.

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Schwaner, M. Janneke, Grace A. Freymiller, Rulon W. Clark, and Craig P. McGowan. "How to Stick the Landing: Kangaroo Rats Use Their Tails to Reorient during Evasive Jumps Away from Predators." Integrative and Comparative Biology 61, no. 2 (May 3, 2021): 442–54. http://dx.doi.org/10.1093/icb/icab043.

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Synopsis Tails are widespread in the animal world and play important roles in locomotor tasks, such as propulsion, maneuvering, stability, and manipulation of objects. Kangaroo rats, bipedal hopping rodents, use their tail for balancing during hopping, but the role of their tail during the vertical evasive escape jumps they perform when attacked by predators is yet to be determined. Because we observed kangaroo rats swinging their tails around their bodies while airborne following escape jumps, we hypothesized that kangaroo rats use their tails to not only stabilize their bodies while airborne

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3

Wei, Ziyan, Jie Li, Songxiang Tang, and Zhao Yang. "Investigation and Improvement of T-Tail Junction Flow Separation for a Demonstration Aircraft." Aerospace 9, no. 10 (September 29, 2022): 567. http://dx.doi.org/10.3390/aerospace9100567.

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Flow separation is easily induced at the junctions of aircraft components, and for aircraft with T-type tails, in particular, it can lead to loss of directional stability under a small sideslip angle. In the reported study, improved delayed detached eddy simulation with a shear-layer-adapted length scale based on the k–ω shear-stress transport method was used to analyze and rectify the corner separation at the junctions of the horizontal and vertical parts of the tail of a demonstration aircraft. This was done to (i) suppress the flow separation caused by the complex interaction of the boundar

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4

Luong, Quang Huan, Jeremy Jong, Yusuke Sugahara, Daisuke Matsuura, and Yukio Takeda. "A Study on the Relationship between the Design of Aerotrain and Its Stability Based on a Three-Dimensional Dynamic Model." Robotics 9, no. 4 (November 19, 2020): 96. http://dx.doi.org/10.3390/robotics9040096.

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A new generation electric high-speed train called Aerotrain has levitation wings and levitates under Wing-in-Ground (WIG) effect along a U-shaped guideway. The previous study found that lacking knowledge of the design makes the prototype unable to regain stability when losing control. In this paper, the nonlinear three-dimensional dynamic model of the Aerotrain based on the rigid body model has been developed to investigate the relationship between the vehicle body design and its stability. Based on the dynamic model, this paper considered an Aerotrain with a horizontal tail and a vertical tai

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5

Lee, B. H. K. "Vertical tail buffeting of fighter aircraft." Progress in Aerospace Sciences 36, no. 3-4 (April 2000): 193–279. http://dx.doi.org/10.1016/s0376-0421(00)00003-8.

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Cao, Xingyu, Hao Dong, Yunsong Gu, Keming Cheng, and Fan Zhang. "Experimental Study of Vertical Tail Model Flow Control Based on Oscillating Jet." Applied Sciences 13, no. 2 (January 5, 2023): 786. http://dx.doi.org/10.3390/app13020786.

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In this paper, wind tunnel experiments are conducted to study the control law and mechanism of oscillating jet flow control to improve the aerodynamic characteristics of the vertical tail when a civil aircraft encounters left side gust or significant crosswind during takeoff and landing. We measured the vertical tail scaling model’s aerodynamics, spatial flow field, and surface pressure when the Reynolds number was 2.12 × 105. The maximum momentum coefficient of the oscillating jet actuator reaches 0.332%. In addition, we studied the flow control effect of the three-dimensional vertical tail s

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7

Han, Bing, and Min Xu. "Prediction of Vertical Tail Buffet Using CFD/CSD Coupling Method." Mathematical Problems in Engineering 2021 (November 23, 2021): 1–9. http://dx.doi.org/10.1155/2021/6295332.

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The vertical tail buffet induced by the vortex breakdown flow is numerically investigated. The unsteady flow is calculated by solving the RANS equations. The structural dynamic equations are decoupled in the modal coordinates. The radial basis functions (RBFs) are employed to generate the deformation mesh. The buffet response of the flexible tail is predicted by coupling the three sets of equations. The results show that the presence of asymmetry flow on the inner and outer surface of the tail forced the structural deflection offsetting the outboard. The frequency of the 2nd bending mode of th

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8

Yang, Qing, J. J. Li, Y. N. Yang, and Z. Y. Ye. "Experimental and Computational Studies of Twin-Vertical-Tail Buffet." Advanced Materials Research 33-37 (March 2008): 1241–46. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.1241.

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Characteristics and mechanism of twin-vertical-tail buffet response on airplane configuration with wing root leading edge extension (LEX) were studied by both experiment and computation. Low-speed wind tunnel experiments were carried out to measure the root bending moment and tip acceleration of vertical tail. Vortical flow patterns were visualized via laser light sheet technique. Three-dimensional computation was performed to solve the unsteady Euler equations on rigid model. The results indicate that (1) bursting of vortices emanating from LEX is the main source of twin-vertical-tail buffet;

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9

Liu, Mingzhe, Can Cui, and Jian Sun. "Preliminary Design of Aircraft without Vertical Tail." IOP Conference Series: Earth and Environmental Science 658 (February 20, 2021): 012021. http://dx.doi.org/10.1088/1755-1315/658/1/012021.

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10

Andino, Marlyn Y., John C. Lin, Seele Roman, Emilio C. Graff, Mory Gharib, Edward A. Whalen, and Israel J. Wygnanski. "Active Flow Control on Vertical Tail Models." AIAA Journal 57, no. 8 (August 2019): 3322–38. http://dx.doi.org/10.2514/1.j057876.

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11

Nicolosi, Fabrizio, Danilo Ciliberti, Pierluigi Della Vecchia, Salvatore Corcione, and Vincenzo Cusati. "A comprehensive review of vertical tail design." Aircraft Engineering and Aerospace Technology 89, no. 4 (July 3, 2017): 547–57. http://dx.doi.org/10.1108/aeat-11-2016-0213.

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Purpose This work aims to deal with a comprehensive review of design methods for aircraft directional stability and vertical tail sizing. The focus on aircraft directional stability is due to the significant discrepancies that classical semi-empirical methods, as USAF DATCOM and ESDU, provide for some configurations because they are based on NACA wind tunnel (WT) tests about models not representative of an actual transport airplane. Design/methodology/approach The authors performed viscous numerical simulations to calculate the aerodynamic interference among aircraft parts on hundreds configur

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12

Wilga, C. D., and G. V. Lauder. "Function of the heterocercal tail in sharks: quantitative wake dynamics during steady horizontal swimming and vertical maneuvering." Journal of Experimental Biology 205, no. 16 (August 15, 2002): 2365–74. http://dx.doi.org/10.1242/jeb.205.16.2365.

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SUMMARYThe function of the heterocercal tail in sharks has long been debated in the literature. Previous kinematic data have supported the classical theory which proposes that the beating of the heterocercal caudal fin during steady horizontal locomotion pushes posteroventrally on the water, generating a reactive force directed anterodorsally and causing rotation around the center of mass. An alternative model suggests that the heterocercal shark tail functions to direct reaction forces through the center of mass. In this paper,we quantify the function of the tail in two species of shark and c

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13

Deák, Péter. "Vertical tail FEA with a CAD/CAE based multidisciplinary process." Aircraft Engineering and Aerospace Technology 90, no. 4 (May 8, 2018): 652–58. http://dx.doi.org/10.1108/aeat-11-2016-0212.

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Purpose The purpose of this paper is to make an analytical comparison of two vertical tail models from a structural point of view. Design/methodology/approach The original vertical tail design of PZL-106BT aircraft was used for Computer aided design (CAD) modeling and for creating the finite element model. Findings The nodal displacements, Von-Mises stresses and Buckling factors for two vertical tail models have been found using the finite element method. The idea of a possible Multidisciplinary concept assessment and design (MDCAD) concept was presented. Practical implications The used softwa

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14

SCHOLZ, Dieter. "Empennage sizing with the tail volume complemented with a method for dorsal fin layout." INCAS BULLETIN 13, no. 3 (September 4, 2021): 149–64. http://dx.doi.org/10.13111/2066-8201.2021.13.3.13.

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Purpose: Provide good values for the tail volume coefficient and the lever arm as a percentage of the fuselage length. Provide a statistical method for dorsal fin layout. – Methodology: Based on an understanding of flight physics, the statistical correlation of real aircraft parameters is investigated. This is based on the firm conviction that high fidelity parameters for future aircraft need a checked against parameters of existing successful aircraft. – Findings: Typical tail volume coefficients are between 0.5 and 1.0 for the horizontal tail and between 0.03 and 0.08 for the vertical tail d

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15

Sheta, E. F., and L. J. Huttsell. "Characteristics of F/A-18 vertical tail buffeting." Journal of Fluids and Structures 17, no. 3 (March 2003): 461–77. http://dx.doi.org/10.1016/s0889-9746(02)00138-x.

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16

Liu, Yaolong, and Tianhong Jiang. "Conceptual Aircraft Empennage Design Based on Multidisciplinary Design Optimization Approach." International Journal of Aerospace Engineering 2022 (October 18, 2022): 1–9. http://dx.doi.org/10.1155/2022/9288966.

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Within a conventional aircraft design process, the horizontal tail and vertical tail are generally sized via volume coefficient methods. In this manuscript, an improved method for conceptual aircraft tail design based on multidisciplinary design optimization (MDO) approach with stability and control constraints has been developed. To develop this method, first, the tail design requirements have been derived from the regulations and the fundamental functionalities of tail plans. Then, the empennage design is formulated as an MDO problem. Eventually the design optimization of horizontal and vert

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17

Hauch, R. M., J. H. Jacobs, C. Dima, and K. Ravindra. "Reduction of vertical tail buffet response using active control." Journal of Aircraft 33, no. 3 (May 1996): 617–22. http://dx.doi.org/10.2514/3.46990.

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18

Yang Guang, 杨. 光., 刘欢欢 Liu Huanhuan, 周佳平 Zhou Jiaping, 钦兰云 Qin Lanyun, 王. 维. Wang Wei, and 任宇航 Ren Yuhang. "Research on laser deposition repair aircraft vertical tail beam." Infrared and Laser Engineering 46, no. 2 (2017): 206004. http://dx.doi.org/10.3788/irla201746.0206004.

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Yang Guang, 杨. 光., 刘欢欢 Liu Huanhuan, 周佳平 Zhou Jiaping, 钦兰云 Qin Lanyun, 王. 维. Wang Wei, and 任宇航 Ren Yuhang. "Research on laser deposition repair aircraft vertical tail beam." Infrared and Laser Engineering 46, no. 2 (2017): 206004. http://dx.doi.org/10.3788/irla20174602.206004.

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20

Zhao, Y. H., and H. Y. Hu. "Active Control of Vertical Tail Buffeting by Piezoelectric Actuators." Journal of Aircraft 46, no. 4 (July 2009): 1167–75. http://dx.doi.org/10.2514/1.39464.

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21

Sachs, G. "Why Birds and Miniscale Airplanes Need No Vertical Tail." Journal of Aircraft 44, no. 4 (July 2007): 1159–67. http://dx.doi.org/10.2514/1.20175.

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22

Vinayagamurthy, G., K. M. Parammasivam, and S. Nadaraja Pillai. "Flutter Analysis of Wing, Booster Fin and Vertical Tail." Applied Mechanics and Materials 110-116 (October 2011): 3500–3505. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3500.

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Aerospace vehicles are subjected to various types of severe environmental loads. The basic design criterion includes the minimum weight configuration that results in very flexible structures, which leads to various types of structural interaction problems like flutter, divergence etc. Hence every aerospace vehicle should be analysed for its aeroelastic instabilities. In the present work the flutter analysis of a typical space vehicle was carried out in substructure level with the interface fixed condition. The doublet lattice, zona51 and piston theories are used in the unsteady aerodynamic cal

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23

Katsurayama, Yuta, Mingcong Deng, and Changan Jiang. "Operator-based experimental studies on nonlinear vibration control for an aircraft vertical tail with considering low-order modes." Transactions of the Institute of Measurement and Control 38, no. 12 (July 22, 2016): 1421–33. http://dx.doi.org/10.1177/0142331215592063.

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In this paper, a robust nonlinear control design using an operator-based robust right coprime factorization approach is considered for vibration control on an aircraft vertical tail with piezoelectric elements. First, a model of the aircraft vertical tail is derived to describe vibration response using the operator-based approach, where, to stabilize vibration of the tail, piezoelectric elements are used as actuators and a hysteresis nonlinear property of piezoelectric actuators is considered. Simultaneously, positions of the piezoelectric actuators that are stuck on the plate are arranged by

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24

Liao, J., and G. V. Lauder. "Function of the heterocercal tail in white sturgeon: flow visualization during steady swimming and vertical maneuvering." Journal of Experimental Biology 203, no. 23 (December 1, 2000): 3585–94. http://dx.doi.org/10.1242/jeb.203.23.3585.

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Basal ray-finned fishes possess a heterocercal tail in which the dorsal lobe containing the extension of the vertebral column is longer than the ventral lobe. Clarifying the function of the heterocercal tail has proved elusive because of the difficulty of measuring the direction of force produced relative to body position in the aquatic medium. We measured the direction of force produced by the heterocercal tail of the white sturgeon (Acipenser transmontanus) by visualizing flow in the wake of the tail using digital particle image velocimetry (DPIV) while simultaneously recording body position

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25

Yue Lee, Francis Chun, Christian Jenssen, and Christoph F. Dietrich. "A common misunderstanding in lung ultrasound: the comet tail artefact." Medical Ultrasonography 20, no. 3 (August 30, 2018): 379. http://dx.doi.org/10.11152/mu-1573.

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The comet tail artefact is probably one of the most commonly and imprecisely used to describe vertical artefacts found in lung ultrasound. Two distinct artefacts are commonly observed: the lung comets and the B-lines. Both artefacts differ with regard to generation mechanism and clinical significance. This review explores the current understanding and use of these two artefacts in lung ultrasound and suggests how to avoid the pitfalls related to confusing comet tail artefacts with other vertical artefacts.

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26

Zhang, Xiao Ping, Rui Ren, and Hui Ping Kang. "Study on Unsteady Deformation Law in Roughing Stage of Continuous Hot Strip Rolling." Applied Mechanics and Materials 595 (July 2014): 45–50. http://dx.doi.org/10.4028/www.scientific.net/amm.595.45.

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The vertical-horizontal rolling in roughing stage of continuous hot strip rolling is a common production technique of controlling slab width effectively. Vertical rolling will induce dog-bone, width loss and fish tail in unsteady deformation zone of slab head and tail. A 3D elastic-plastic FEM model for roughing stage of continuous hot strip rolling was established using ABAQUS/Explicit and research on the influences of those technical parameters such as slab width, slab thickness, reduction of vertical roll and horizontal roll on unsteady deformation of metal was carried out. The research wor

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27

Chen, Y., V. Wickramasinghe, and D. Zimcik. "Active Control of a hybrid actuation system for aircraft vertical fin buffet load alleviation." Aeronautical Journal 110, no. 1107 (May 2006): 315–26. http://dx.doi.org/10.1017/s000192400001318x.

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AbstractTwin-tail fighter aircraft may experience intense buffet loads when flying at high angles of attack. One such aircraft is the F/A-18 where the broadband buffet loads primarily excite the first bending and torsional modes of the vertical fin, resulting in significant vibration and dynamic stresses on the vertical tail structure. This buffet phenomenon reduces the fatigue life of the aircraft structure while decreasing mission availability.An international technical co-operation program was initiated to develop a novel hybrid actuation system to actively alleviate the buffet response of

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28

Wu, Bin, Peng Chen, Yong Jiang Hu, and Chang Long Wang. "Research on Attitude Singularity Problem of Small Tail-Sitter Aircraft." Applied Mechanics and Materials 599-601 (August 2014): 401–4. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.401.

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Singularity problem in attitude estimation of small tail-sitter aircraft with traditional algorithm is researched. According to the flight characteristics of small tail-sitter aircraft, a new algorithm is proposed. Vertical Euler angles whose singularity points are away from standard Euler angles are introduced. Only one set of angles are used in horizontal or near-vertical state to avoid singularity. Simulation results show that attitude angles can vary continuously and have high accuracy under the condition of a large tilting angle.

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29

Chiu, Chyn-Shan, and I. J. Lin. "Sidewash on the vertical tail in subsonic and supersonic flows." Journal of Aircraft 31, no. 6 (November 1994): 1252–56. http://dx.doi.org/10.2514/3.46643.

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30

Whalen, Edward A., Arvin Shmilovich, Marc Spoor, John Tran, Paul Vijgen, John C. Lin, and Marlyn Andino. "Flight Test of an Active Flow Control Enhanced Vertical Tail." AIAA Journal 56, no. 9 (September 2018): 3393–98. http://dx.doi.org/10.2514/1.j056959.

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31

Dandois, Julien, Christophe Verbeke, and Frédéric Ternoy. "Performance Enhancement of a Vertical Tail Model with Sweeping Jets." AIAA Journal 58, no. 12 (December 2020): 5202–15. http://dx.doi.org/10.2514/1.j059161.

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32

Kim, David, and Maciej Marciniak. "Prediction of Vertical Tail Maneuver Loads Using Backpropagation Neural Networks." Journal of Aircraft 37, no. 3 (May 2000): 526–30. http://dx.doi.org/10.2514/2.2630.

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33

Sheta, Essam F. "Alleviation of Vertical Tail Buffeting of F/A-18 Aircraft." Journal of Aircraft 41, no. 2 (March 2004): 322–30. http://dx.doi.org/10.2514/1.9327.

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34

Rathay, Nicholas W., Matthew J. Boucher, Michael Amitay, and Edward Whalen. "Performance Enhancement of a Vertical Tail Using Synthetic Jet Actuators." AIAA Journal 52, no. 4 (April 2014): 810–20. http://dx.doi.org/10.2514/1.j052645.

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35

Petrukovich, A. A., and Y. I. Yermolaev. "Interball-tail observations of vertical plasma motions in the magnetotail." Annales Geophysicae 20, no. 3 (March 31, 2002): 321–27. http://dx.doi.org/10.5194/angeo-20-321-2002.

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Abstract. The Interball spacecraft configuration favors, in contrast to previous experiments, investigation of vertical ion flows (GSM Vz ). We use measurements of the CORALL instrument for the statistical study of Vz and Vy plasma flows in the mid-tail plasma sheet. In agreement with the previous observations, the mean Vy was positive on the dusk side and negative on the dawn side. When IMF was southward, the mean Vz consisted of the convection flow towards the equatorial plane ~ 7 km/s and the northward flow ~ 8 km/s. When IMF was northward, both components nearly vanished. The velocity vari

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36

Lintner, Benjamin R., Christopher E. Holloway, and J. David Neelin. "Column Water Vapor Statistics and Their Relationship to Deep Convection, Vertical and Horizontal Circulation, and Moisture Structure at Nauru." Journal of Climate 24, no. 20 (October 15, 2011): 5454–66. http://dx.doi.org/10.1175/jcli-d-10-05015.1.

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Abstract Relationships among relatively high-frequency probability distribution functions (pdfs) of anomalous column water vapor (cwv), precipitating deep convection, and the vertical and horizontal structures of circulation and tropospheric moisture are investigated for the Atmospheric Radiation Measurement (ARM) climate observing facility at Nauru in the western equatorial Pacific. At the highest frequencies (subdaily) analyzed, the cwv pdf exhibits a Gaussian core with pronounced longer-than-Gaussian, approximately exponential tails, with the relatively lower-frequency submonthly pdfs becom

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37

Paziresh, Ali, Amir Hossein Nikseresht, and Hashem Moradi. "Wing-Body and Vertical Tail Interference Effects on Downwash Rate of the Horizontal Tail in Subsonic Flow." Journal of Aerospace Engineering 30, no. 4 (July 2017): 04017001. http://dx.doi.org/10.1061/(asce)as.1943-5525.0000704.

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38

Schäfer, Dominik. "T-tail flutter simulations with regard to quadratic mode shape components." CEAS Aeronautical Journal 12, no. 3 (June 18, 2021): 621–32. http://dx.doi.org/10.1007/s13272-021-00524-8.

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AbstractIt is known that the dynamic aeroelastic stability of T-tails is dependent on the steady aerodynamic forces at aircraft trim condition. Accounting for this dependency in the flutter solution process involves correction methods for doublet lattice method (DLM) unsteady aerodynamics, enhanced DLM algorithms, unsteady vortex lattice methods (UVLM), or the use of CFD. However, the aerodynamic improvements along with a commonly applied modal approach with linear displacements results in spurious stiffness terms, which distort the flutter velocity prediction. Hence, a higher order structural

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39

Chen, Sinuo, Zhiwei Shi, Zijie Zhao, Xi Geng, and Zhen Chen. "Investigation of vertical tail buffeting alleviation controlled by nanosecond plasma actuators." Physics of Fluids 33, no. 8 (August 2021): 087109. http://dx.doi.org/10.1063/5.0057280.

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40

Bramesfeld, Götz, Mark D. Maughmer, and Steven M. Willits. "Piloting Strategies for Controlling a Transport Aircraft After Vertical-Tail Loss." Journal of Aircraft 43, no. 1 (January 2006): 216–25. http://dx.doi.org/10.2514/1.13357.

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41

Zhang, Qing, and Zheng-yin Ye. "Novel Method Based on Inflatable Bump for Vertical Tail Buffeting Suppression." Journal of Aircraft 52, no. 1 (January 2015): 367–71. http://dx.doi.org/10.2514/1.c032552.

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42

Hazra, Rajat Subhra, and Krishanu Maulik. "Tail Behavior of Randomly Weighted Sums." Advances in Applied Probability 44, no. 3 (September 2012): 794–814. http://dx.doi.org/10.1239/aap/1346955265.

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Let {Xt, t ≥ 1} be a sequence of identically distributed and pairwise asymptotically independent random variables with regularly varying tails, and let {Θt, t ≥ 1} be a sequence of positive random variables independent of the sequence {Xt, t ≥ 1}. We will discuss the tail probabilities and almost-sure convergence of X(∞) = ∑t=1∞ΘtXt+ (where X+ = max{0, X}) and max1≤k<∞∑t=1kΘtXt, and provide some sufficient conditions motivated by Denisov and Zwart (2007) as alternatives to the usual moment conditions. In particular, we illustrate how the conditions on the slowly varying function involved in

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43

Hazra, Rajat Subhra, and Krishanu Maulik. "Tail Behavior of Randomly Weighted Sums." Advances in Applied Probability 44, no. 03 (September 2012): 794–814. http://dx.doi.org/10.1017/s0001867800005887.

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Let {X t , t ≥ 1} be a sequence of identically distributed and pairwise asymptotically independent random variables with regularly varying tails, and let {Θ t , t ≥ 1} be a sequence of positive random variables independent of the sequence {X t , t ≥ 1}. We will discuss the tail probabilities and almost-sure convergence of X (∞) = ∑ t=1 ∞Θ t X t + (where X + = max{0, X}) and max1≤k&lt;∞∑ t=1 k Θ t X t , and provide some sufficient conditions motivated by Denisov and Zwart (2007) as alternatives to the usual moment conditions. In particular, we illustrate how the conditions on the slowly var

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44

Wang, Chia-Chi, Chia Chou, and Wei-Liang Lee. "Breakdown and Reformation of the Intertropical Convergence Zone in a Moist Atmosphere." Journal of the Atmospheric Sciences 67, no. 4 (April 1, 2010): 1247–60. http://dx.doi.org/10.1175/2009jas3164.1.

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Abstract The effects of moisture on the intertropical convergence zone (ITCZ) over the eastern Pacific on the synoptic time scale are investigated using an intermediate complexity atmospheric circulation model, the quasi-equilibrium tropical circulation model (QTCM1), on an aquaplanet. The dry simulation shows results consistent with those of simple dynamic models, except that a slightly stronger heating rate is needed owing to different model designs. In the moist simulations, the most important result is the formation of a tail southwest of a vortex during and after the ITCZ breakdown. This

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Coombs Jr., Walter P. "Ankylosaurian tail clubs of middle Campanian to early Maastrichtian age from western North America, with description of a tiny club from Alberta and discussion of tail orientation and tail club function." Canadian Journal of Earth Sciences 32, no. 7 (July 1, 1995): 902–12. http://dx.doi.org/10.1139/e95-075.

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There are numerous undescribed tail clubs of diverse morphologies that may be assigned to Euoplocephalus (Ornithischia, Thyreophora, Ankylosauridae) of middle Campanian to early Maastrichtian age. Among these is an exceptionally small club, the smallest so far described from North America. Most, but not all, clubs can be placed into one of three shape categories: round, bluntly pointed, or elongate. Much of this diversity is ontogenetic or individual, but some of it may be taxonomic. Caudal structure restricts lateral, and especially vertical, tail flexibility. Analysis of hindlimb length, tai

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Wang, Xiaoming, and Shengguo Liang. "Maneuverability Analysis of a Novel Portable Modular AUV." Mathematical Problems in Engineering 2019 (June 26, 2019): 1–17. http://dx.doi.org/10.1155/2019/1631930.

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ZFAUV is a novel portable modular AUV. There are four fixed thrusters at tail, and two tunnel thrusters are set at front. The maneuverability of ZFAUV is relatively high. It can turn around in situ, move lateral or move up/down vertical. The yaw and pitch can be controlled by tunnel thrusters or differential control of tail thrusters, but differential control will reduce the forward force. Different from propeller-rudder AUVs, the turning radius is related to speed forward: the smaller the speed forward, the smaller the turning radius. The minimum turning radius tends to be zero. The mathemati

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Islas-Narvaez, Emmanuel Alejandro, Jean Fulbert Ituna-Yudonago, Luis Enrique Ramos-Velasco, Mario Alejandro Vega-Navarrete, and Octavio Garcia-Salazar. "Design and Determination of Aerodynamic Coefficients of a Tail-Sitter Aircraft by Means of CFD Numerical Simulation." Machines 11, no. 1 (December 23, 2022): 17. http://dx.doi.org/10.3390/machines11010017.

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Vertical take-off and landing (VTOL) aircraft have become important aerial vehicles for various sectors, such as security, health, and commercial sectors. These vehicles are capable of operating in different flight modes, allowing for the covering of most flight requirements in most environments. A tail-sitter aircraft is a type of VTOL vehicle that has the ability to take off and land vertically on it elevators (its tail) or on some rigid support element that extends behind the trailing edge. Most of the tail-sitter aircraft are designed with a fixed-wing adaptation rather than having their o

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Qiu, Fu Sheng, Wu Qiang Ji, and Hou Chao Xu. "Vertical Tail Topology Optimization Design Based on the Variable Density Method with Constraint Factor." Applied Mechanics and Materials 300-301 (February 2013): 280–84. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.280.

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The topology optimization design problem with multiple constraints for the complex vertical tail structure is studied in this paper. The variable density structural topology optimization method is improved by introducing a constraint factor. According to the different structural constraints and design requirements, variable factors and element pseudo density are initialized via finite element method. This method is controlled by the constraint factors, and the improved method combining with Rational Approximation of Material Properties (RAMP) density-stiffness interpolation model with optimali

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Kim, Myeongjin, Bongsub Song, and Dongwon Yun. "Study on the Compact Balance Control Mechanism for Guinea Fowl Jumping Robot." Electronics 11, no. 8 (April 8, 2022): 1191. http://dx.doi.org/10.3390/electronics11081191.

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We developed a guinea fowl jumping robot with a one-axis momentum wheel mechanism with a passive hallux model. The Guinea fowl jumping robot was able to perform stable vertical jumping due to the linkage structure designed as a passive hallux model. Furthermore, we used the one-axis momentum wheel mechanism in the jumping robot for making the compact balance control mechanism that can control the body angle of the robot. Through the experiment, the conventional jumping robot uses the inertial tail to adjust the body angle in the air for stable landing and jumping. However, in the case of an in

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Gamble, Lawren L., and Daniel J. Inman. "Yaw Control of a Smart Morphing Tailless Aircraft Concept." Advances in Science and Technology 101 (October 2016): 127–32. http://dx.doi.org/10.4028/www.scientific.net/ast.101.127.

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Aircraft morphing with regard to UAVs has recently gained incredible momentum; however, only a limited amount of research has been conducted on its effect on tailless aircraft. This is partly due to aerodynamic compromises such as directional instabilities that arise in the absence of a vertical stabilizer. Yet birds readily adapt to adverse flight conditions without vertical stabilizers and are unhindered with respect to stability and maneuvering due to their smooth continuous shape change and rapid muscle response. This research, motivated by the discrepancy between manmade and natural fligh

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