Considering the Requirements of Static Strength for the Rotating Straight Blade Similar Experimental Model Design Method

2016 ◽  
Vol 52 (9) ◽  
pp. 79
Author(s):  
Zhong LUO
Keyword(s):  
Experimental Model ◽  
Design Method ◽  
Static Strength ◽  
Model Design ◽  
Straight Blade

Multi-Model Adaptive Regulation for Aircraft Dynamics With Different Zero Structures

2014 ◽  
Author(s):  
Eric D. Peterson ◽  
Harry G. Kwatny
Keyword(s):  
State Feedback ◽  
Design Method ◽  
Linear Matrix ◽  
Model Design ◽  
Multiple Model ◽  
Matrix Inequalities ◽  
Adaptive Regulation ◽  
Aircraft Dynamics ◽  
Adaptive Regulator ◽  
Parameter Dependent

An adaptive regulator is designed for parameter dependent families of systems subject to changes in the zero structure. Since continuous adaptive regulation is limited by relative degree and right half plane zeros, a multiple model adaptive regulator is implemented. The two multiple model design subproblems, covering and switching, are addressed with LQR state feedback and Lyapunov function switch logic respectively. These two subproblems are combined into a set of Linear Matrix Inequalities (LMI) and concurrently solved. The multiple model design method is applied to longitudinal aircraft dynamics.

scholarly journals Structure design and reliability analysis of Al-Ti lugs

2021 ◽  
Vol 39 (1) ◽  
pp. 1-8
Author(s):  
Yunwen Feng ◽  
Jiale Zhang ◽  
Xiaofeng Xue ◽  
Xiaoping Zhong ◽  
Wei Xie
Keyword(s):  
Reliability Analysis ◽  
Structural Design ◽  
Design Principle ◽  
Load Transfer ◽  
Design Method ◽  
Static Strength ◽  
Structure Design ◽  
Safety Design ◽  
Design Requirements ◽  
Metal Materials

Aircraft lug joint is the key part of load transfer. In order to improve the safety of lug joint, on the premise of meeting the design requirements of static strength and fatigue, the composite connection lug structure design technology of different metal materials is proposed in this paper. Firstly, the damage safety design and life reliability analysis of the lug structure are studied theoretically. Secondly, based on the concept of damage safety design and the design principle of deformation coordination, the design method of composite connection lug with deformation coordination is proposed, and the thickness ratio of single ear is 0.8:1:0.8. Finally, the reliability of the composite lug is analyzed. The results show that the structural design scheme of aluminum-titanium composite ear piece can meet the requirements of static strength and damage tolerance, and compared with the conventional ear structure, the failure probability of structure mission life is greatly reduced when the weight of the composite connection lug is only increased by 4.9%. The proposed method can effectively guide the structural design of composite ear piece.

Experimental Model Design and Preliminary Numerical Verification of Fluid–Thermal–Structural Coupling Problem

AIAA Journal ◽  
2019 ◽  
Vol 57 (4) ◽  
pp. 1715-1724 ◽  
Author(s):  
Liu Lei ◽  
Dai Guangyue ◽  
Zeng Lei ◽  
Wang Zhenfeng ◽  
Gui Yewei
Keyword(s):  
Experimental Model ◽  
Numerical Verification ◽  
Model Design ◽  
Structural Coupling ◽  
Coupling Problem

Dollars and sense: Considerations for experimental model design

1994 ◽  
Vol 13 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Gamal M. Ghoniem ◽  
Todd L. Vandenberg
Keyword(s):  
Experimental Model ◽  
Model Design

Membrane Computing Model Design with Quantum-Inspired Evolutionary Algorithms

2013 ◽  
Vol 655-657 ◽  
pp. 1761-1764 ◽  
Author(s):  
Hai Na Rong ◽  
Xiao Li Huang
Keyword(s):  
Membrane Computing ◽  
Design Method ◽  
Main Idea ◽  
Natural Computing ◽  
Automatic Design ◽  
Model Design ◽  
Evolution Rule ◽  
Computing Model ◽  
Rule Set ◽  
Computing Models

As a branch of natural computing, membrane computing has attracted much attention in various disciplines. But the programmability of membrane computing models is an ongoing and challenging issue in this area. This paper develops the automatic design of membrane computing models through predefining the membrane structure and initial objects and introducing a modified quantum-inspired evolutionary algorithm with a local disturbance to select an appropriate subset from a redundant evolution rule set. The main idea of the presented method is that multiple membrane computing models, instead of only one model like in the literature, can be designed by applying one redundant evolution rule set. The effectiveness of the design method is verified by the experiments.

Optimization of Product Assembly Relations Based on Connection Reliability

2010 ◽  
Vol 431-432 ◽  
pp. 289-292 ◽  
Author(s):  
Zhao Liang Jiang ◽  
Si Si Xuanyuan ◽  
Zhao Qian Li ◽  
Xiang Xu Meng
Keyword(s):  
Mathematical Model ◽  
Design Method ◽  
Model Design ◽  
Design Scheme ◽  
Definition Of ◽  
Product Assembly

Enhancing the reliability of product becomes one of the most important ways to perfect its quality. Based on the traditional reliability definition, the definition of assembly connection reliability is presented to describe the connection ability of two assembled parts firstly. Then, the design method based on assembly connection reliability is proposed and a new step-by-step mathematical model for assigning assembly reliability to the parts and sub-systems is established. Based on the model, design scheme oriented assembly reliability is optimized.

The Small-Scale Distortion Model Design Method for Ultimate Strength Test of Hull Girder

2014 ◽  
Author(s):  
Chenfeng Li ◽  
Huilong Ren ◽  
Donghao Xu ◽  
Zeng Ji
Keyword(s):  
Large Scale ◽  
Design Method ◽  
Scale Model ◽  
Small Scale ◽  
Model Design ◽  
Hull Girder ◽  
Distortion Model ◽  
Section Modulus ◽  
Large Scale Model ◽  
Ultimate Moment

The objective of this paper is to develop a design method of small-scale distortion model for ultimate bearing capacity test. The ultimate moment is an important index of ship girder strength. Experimental analyses are regarded as the most straightforward and effective methods to predict ultimate moment of hull girder, especially full-scale and/or large-scale model testing. However, large-scale model test not only requires high loading capacity of test device, but it also costs a lot of human and material resources. Based on the similarity theory and failure mechanism of hull girder under bending, a small-scale distortion model design method is presented in this paper. In which, the transverse section is divided into several parts, such as main deck, middle deck, bottom and so on. Then, two similar criterions are required to follow. There are section modulus of each part and critical stress of main stiffened plats. The similar section modulus ensures a similar stress distribution of transverse section between model and real structures under bending; the similar critical stress ensures the same failure modes of stiffened plates. Based on this method, a real vessel is taken as example to design its small-scale (1/25 scale) distortion model. The simulating results indicate that this model design method is precise and reliable.

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