scholarly journals Experimental Study of the Aerodynamic Interaction between the Forewing and Hindwing of a Beetle-Type Ornithopter

Aerospace ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 83 ◽  
Author(s):  
Hidetoshi Takahashi ◽  
Kosuke Abe ◽  
Tomoyuki Takahata ◽  
Isao Shimoyama
Keyword(s):  
Pressure Sensors ◽  
Aerodynamic Performance ◽  
Flapping Wing ◽  
Differential Pressure ◽  
Vertical Force ◽  
Unique Combination ◽  
Force Enhancement ◽  
Forward Flight ◽  
Micro Electro Mechanical Systems ◽  
Aerodynamic Interaction

Beetles have attracted attention from researchers due to their unique combination of a passively flapping forewing and an actively flapping hindwing during flight. Because the wing loads of beetles are larger than the wing loads of other insects, the mechanism of beetle flight is potentially useful for modeling a small aircraft with a large weight. In this paper, we present a beetle-type ornithopter in which the wings are geometrically and kinematically modeled after an actual beetle. Furthermore, the forewing is designed to be changeable between no-wing, flapping-wing, or fixed-wing configurations. Micro-electro-mechanical systems (MEMS) differential pressure sensors were attached to both the forewing and the hindwing to evaluate the aerodynamic performance during flight. Whether the forewing is configured as a flapping wing or a fixed wing, it generated constant positive differential pressure during forward flight, whereas the differential pressure on the hindwing varied with the flapping motion during forward flight. The experimental results suggest that beetles utilize the forewing for effective vertical force enhancement.

Experimental Studies to Understand the Hover and Forward Flight Performance of a MAV-Scale Flapping Wing Concept

2012 ◽  
Vol 57 (2) ◽  
pp. 1-11 ◽  
Author(s):  
Ria Malhan ◽  
Moble Benedict ◽  
Inderjit Chopra
Keyword(s):  
Degrees Of Freedom ◽  
Lift Coefficient ◽  
Experimental Studies ◽  
High Amplitude ◽  
Aerodynamic Performance ◽  
Flapping Wing ◽  
Forward Flight ◽  
Flexible Wings ◽  
Wind Speeds ◽  
Torsionally Flexible

Systematic experimental studies were performed to understand the role of two key degrees of freedom, flapping and pitching, in aerodynamic performance of a flapping wing, in both hover and forward flight. Required flapping kinematics is prescribed mechanically, and dynamic pitching/twisting is obtained passively using inertial and aerodynamic forces. Forces produced by the wing are measured at the root using a six-component balance at different flapping frequencies, flapping/pitching amplitudes, and wind speeds. The results clearly show that maximum average thrust over a flap cycle in hover can be achieved using symmetric, high amplitude passive pitching. However, in forward flight, optimum aerodynamic performance (lift and propulsive thrust) is obtained using asymmetric wing pitching with low pitching amplitudes. Furthermore, dynamic twisting (obtained using flexible wings), instead of dynamic pitching, produces better performance in forward flight due to spanwise and temporal modulation of the wing pitch angle. Pure flapping (no pitching) of rigid wings in forward flight at high reduced frequencies and high pitch angles produces a threefold increase in lift coefficient over static values. Maximum average propulsive thrust over a flap cycle in forward flight is obtained using symmetric pitching. To produce high values of both, average lift and thrust, an asymmetry in kinematics along with pitching is required in forward flight. This can be achieved either through asymmetric pitching of rigid wings or dynamic twisting of torsionally flexible wings.

scholarly journals Aerodynamic interaction between propellers of a distributed-propulsion system in forward flight

2021 ◽  
pp. 107009
Author(s):  
Reynard de Vries ◽  
Nando van Arnhem ◽  
Tomas Sinnige ◽  
Roelof Vos ◽  
Leo L.M. Veldhuis
Keyword(s):  
Propulsion System ◽  
Forward Flight ◽  
Aerodynamic Interaction ◽  
Distributed Propulsion

Effect of flexibility on flapping wing characteristics under forward flight

2014 ◽  
Vol 46 (5) ◽  
pp. 055515 ◽  
Author(s):  
Jianyang Zhu ◽  
Chaoying Zhou ◽  
Chao Wang ◽  
Lin Jiang
Keyword(s):  
Flapping Wing ◽  
Forward Flight

Differential Pressure Sensors for Underwater Speedometry in Variable Velocity and Acceleration Conditions

2018 ◽  
pp. 1-9 ◽  
Author(s):  
Juan Francisco Fuentes-Perez ◽  
Christian Meurer ◽  
Jeffrey Andrew Tuhtan ◽  
Maarja Kruusmaa
Keyword(s):  
Pressure Sensors ◽  
Differential Pressure ◽  
Variable Velocity

Optimal transition of flapping wing micro-air vehicles from hovering to forward flight

2019 ◽  
Vol 90 ◽  
pp. 246-263 ◽  
Author(s):  
Ahmed A. Hussein ◽  
Ahmed E. Seleit ◽  
Haithem E. Taha ◽  
Muhammad R. Hajj
Keyword(s):  
Micro Air Vehicles ◽  
Flapping Wing ◽  
Forward Flight ◽  
Air Vehicles

scholarly journals 3D Printed Flowmeter Based on Venturi Effect with Integrated Pressure Sensors

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1509 ◽  
Author(s):  
Krzysztof Adamski ◽  
Bartosz Kawa ◽  
Rafał Walczak
Keyword(s):  
Liquid Flow ◽  
Pressure Sensors ◽  
Differential Pressure ◽  
Single Chip ◽  
Flow Meter ◽  
Modular Systems ◽  
Venturi Effect ◽  
3D Printed

In this paper we present a 3D printed flow meter based on venturri effect. Dimensions of the microchannels are 800 µm for wider and 400 µm for thinker channel. Application of different type of sensors was investigated: differential, absolute and digital barometer. Results of measurement of differential pressure and calculation of liquid flow are shown. Presented microfluidics device can be also easy adapted for modular systems. Presented flow meter is the first integration of commercial available sensors and 3D printed microfluidics structure in a single chip.

Single-chip solution for electronics unit of a smart pressure sensor

Sensor Review ◽  
2020 ◽  
Vol 40 (5) ◽  
pp. 529-534
Author(s):  
Igor S. Nadezhdin ◽  
Aleksey G. Goryunov
Keyword(s):  
Pressure Sensor ◽  
Sensitive Element ◽  
Noise Immunity ◽  
Pressure Sensors ◽  
Cost Effective ◽  
Differential Pressure ◽  
Manufacturing Cost ◽  
Content Type ◽  
Differential Pressure Sensor ◽  
Developed Pressure

Purpose Differential pressure is an important technological parameter, one urgent task of which is control and measurement. To date, the lion’s share of research in this area has focused on the development and improvement of differential pressure sensors. The purpose of this paper is to develop a smart differential pressure sensor with improved operational and metrological characteristics. Design/methodology/approach The operating principle of the developed pressure sensor is based on the capacitive measurement principle. The measuring unit of the developed pressure sensor is based on a differential capacitive sensitive element. Programmable system-on-chip (PSoC) technology has been used to develop the electronics unit. Findings The use of a differential capacitive sensitive element allows the unit to compensate for the influence of interference (for example, temperature) on the measurement result. With the use of PSoC technology, it is also possible to increase the noise immunity of the developed smart differential pressure sensor and provide an unparalleled combination of flexibility and integration of analog and digital functionality. Originality/value The use of PSoC technology in the developed smart differential pressure sensor has many indisputable advantages, as the size of the entire circuit can be minimized. As a result, the circuit has improved noise immunity. Accordingly, the procedure for debugging and changing the software of the electronics unit is simplified. These features make development and manufacturing cost effective.

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