Towards the Industrial Application of Morphing Aircraft Wings—Development of the Actuation Kinematics of a Droop Nose

2016 ◽  
pp. 195-207
Author(s):  
Stefan Storm ◽  
Johannes Kirn
Keyword(s):  
Industrial Application ◽  
Morphing Aircraft ◽  
Aircraft Wings

A Study on the Structural Suitability of Tensegrity Structures to Serve As Morphing Aircraft Wings

2018 ◽  
Author(s):  
David H. Myszka ◽  
James J. Joo
Keyword(s):  
Structural Characteristics ◽  
Aircraft Structures ◽  
Morphing Aircraft ◽  
Aircraft Wings ◽  
Shape Morphing ◽  
Configuration Change ◽  
Tensegrity Systems ◽  
Inherent Strength ◽  
Traditional Structures

This paper presents an investigation into the structural characterization of tensegrity systems for potential use as aircraft structures, especially for morphing aircraft. Morphing aircraft provide multi-role and multi-mission capabilities by adapting their performance to different in-flight requirements. Flexible elements must be included within the structure to permit morphing capabilities compared to conventional single mission aircraft, which are designed for high rigidity and not ideal for shape morphing applications. Tensegrity systems are structures that consist of a series of connected cables, in tension, and struts, in compression, that exist in a self-equilibrium state. Since the struts and cables are loaded axially, external loads are efficiently distributed throughout the tensegrity components resulting in a strong and stiff structure. Adjusting the pretension of the tensegrity will tailor the structural characteristics as needed without a basic configuration change. By changing the length of the cables or struts, tensegrity systems are capable of movement while maintaining their inherent strength and rigidity. This makes tensegrity systems an attractive candidate for morphing aircraft structures. This paper quantifies the strength and rigidity of a single module of various tensegrity systems along with traditional structures to assess their ability to serve as aircraft wings. Those properties are evaluated after boundary conditions are carefully selected to avoid adding unnecessary stiffness. Lastly, a concept for a tensegrity morphing aircraft wing is presented.

Design of Planar, Shape-Changing Rigid-Body Mechanisms for Morphing Aircraft Wings

2012 ◽  
Vol 4 (4) ◽  
Author(s):  
Kai Zhao ◽  
James P. Schmiedeler ◽  
Andrew P. Murray
Keyword(s):  
Rigid Body ◽  
Shape Change ◽  
Solution Space ◽  
Closed Curve ◽  
Morphing Aircraft ◽  
Aircraft Wings ◽  
Revolute Joints ◽  
Multi Objective Genetic Algorithm ◽  
Prismatic Joints ◽  
Fixed End

This paper presents a procedure to synthesize planar rigid-body mechanisms, containing both prismatic and revolute joints, capable of approximating a shape change defined by a set of morphing curves in different positions. The existing mechanization process is extended specifically to enable the design of morphing aircraft wings. A portion of the closed-curve morphing chain that has minimal displacement is identified as the structural ground after the segmentation process. Because of the revolute joints placed at the endpoints of the ground section, the moving links of the fixed-end morphing chain need to be repositioned relative to each of the desired wing shapes so as to minimize the error in approximating them. With the introduction of prismatic joints, a building-block approach is employed to mechanize the fixed-end morphing chain. The blocks are located in an assembly position to generate a single degree-of-freedom (DOF) mechanism. Because of the additional constraints associated with prismatic joints compared to revolute joints, the size of the solution space is reduced, so random searches of the design space to find solution mechanisms are ineffective. A multi-objective genetic algorithm is employed instead to find a group of viable designs that tradeoff minimizing matching error with maximizing mechanical advantage. The procedure is demonstrated with a synthesis example of a 1-DOF mechanism approximating eight closed-curve wing profiles.

Mechanism of irregular crack-propagation in thermal controlled fracture of ceramics induced by microwave

2020 ◽  
Vol 21 (6) ◽  
pp. 610
Author(s):  
Xiaoliang Cheng ◽  
Chunyang Zhao ◽  
Hailong Wang ◽  
Yang Wang ◽  
Zhenlong Wang
Keyword(s):  
Crack Propagation ◽  
Industrial Application ◽  
Ceramic Materials ◽  
Advanced Technology ◽  
Analytical Models ◽  
Propagation Mechanism ◽  
Unstable Crack ◽  
Fracture Simulation ◽  
Initial Stage ◽  
Controlled Fracture

Microwave cutting glass and ceramics based on thermal controlled fracture method has gained much attention recently for its advantages in lower energy-consumption and higher efficiency than conventional processing method. However, the irregular crack-propagation is problematic in this procedure, which hinders the industrial application of this advanced technology. In this study, the irregular crack-propagation is summarized as the unstable propagation in the initial stage, the deviated propagation in the middle stage, and the non-penetrating propagation in the end segment based on experimental work. Method for predicting the unstable propagation in the initial stage has been developed by combining analytical models with thermal-fracture simulation. Experimental results show good agreement with the prediction results, and the relative deviation between them can be <5% in cutting of some ceramics. The mechanism of deviated propagation and the non-penetrating propagation have been revealed by simulation and theoretical analysis. Since this study provides effective methods to predict unstable crack-propagation in the initial stage and understand the irregular propagation mechanism in the whole crack-propagation stage in microwave cutting ceramics, it is of great significance to the industrial application of thermal controlled fracture method for cutting ceramic materials using microwave.

DESIGNING OF AN EMBEDDED SYSTEM FOR WIRELESS SENSOR NETWORK FOR HAZARDOUS GAS LEAKAGE CONTROL FOR INDUSTRIAL APPLICATION

2018 ◽  
Vol 6 (2) ◽  
pp. 1 ◽  
Author(s):  
DESHMUKH P. V. MANE ◽  
D. M. ADAT ◽  
B. P. LADGAONAKAR ◽  
S. K. TILEKAR ◽  
◽  
...  
Keyword(s):  
Wireless Sensor Network ◽  
Embedded System ◽  
Sensor Network ◽  
Industrial Application ◽  
Wireless Sensor ◽  
Gas Leakage ◽  
Leakage Control ◽  
Hazardous Gas
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