Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Shape optimization of helicopter subfloor intersection element under crash loading
Download
index.pdf
Date
2017
Author
Türe, Mustafa Okan
Metadata
Show full item record
Item Usage Stats
177
views
60
downloads
Cite This
The aim of the crashworthiness is maintaining a survivable space for occupants and absorb crash energy as much as possible. The statistics showed that 85% of all rotorcraft accidents can be survivable. Thus, crashworthy design has direct effect on occupants' survival. This thesis analyses a longitudinal beam and lateral frame intersection point on helicopter subloor. Analysis is performed on ABAQUS Dynamic/Explicit solver. Analysis includes high deformation levels, self-contact and nonlinearities. 110 kg mass is dropped on test structure to simulate crush. The test specimen impacted at 7 m/s vertical speed. To improve the design concept, energy absorption capability of the structure will be examine. Test verification is performed in the first part. After modelling techniques set with verification, geometric optimization is performed to get better energy absorbing capability of subfloor structure. Genetic algorithm is used while finding the best crashworthy solution in our design limits. At the first part of optimization, only geometric variables are investigated. At the second part, material is added as another parameter. Optimum energy absorber structure is aimed as a result of this process.
Subject Keywords
Helicopters
,
Helicopters
,
Helicopters
URI
http://etd.lib.metu.edu.tr/upload/12621633/index.pdf
https://hdl.handle.net/11511/26883
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Design and analysis of fixed load crushable column type energy absorbing mechanism for a helicopter seat
Öztürk, Gülce; Kayran, Altan; Department of Aerospace Engineering (2018)
Crashworthiness is the survivability of occupants inside a vehicle during a crash. In helicopters, crashworthiness is ensured by three subsystems; the landing gear, floor structure and the seats. Because of the critical role of the seats in helicopter crashworthiness evaluation, dynamic performance of the seat has to be studied in depth. There are different regulations in which requirements of survivable loads and crash conditions are defined. In this respect, a seat that is used in helicopter should be cer...
OPTIMAL CAPACITY-EXPANSION PLANNING IN MULTIAQUIFER SYSTEMS
BASAGAOGLU, H; Yazıcıgil, Hasan (1994-11-01)
Three models were developed and tested for the optimal capacity expansion planning in a hypothetical multiaquifer system. The response of the system was included in the models using response matrices. All models are 0/1 mixed-integer programming models and enable the determination of minimum capital investment and operation costs of well fields and associated pipeline facilities while satisfying a set of system constraints. The performances of the models are compared in terms of computational requirement...
A Comparison of model following control systems for helicopter flight control near hover
Okçu, Ilgaz Doğa; Kutay, Ali Türker; Department of Aerospace Engineering (2015)
Helicopters are complex, coupled dynamic systems with unstable behavior. Countless studies have shown that decoupling the helicopter flight dynamics greatly reduces pilot work load and increases the handling qualities. Design guidelines such as Aeronautical Design Standard 33E-PRF (ADS-33E), which are developed as a means of measuring the handling qualities of a given helicopter, emphasizes that coupling between pitch, roll, yaw and heave degrees of freedom are undesired. ADS-33E also gives flight dynamics ...
Comparison of Intelligent Classification Techniques by Practicing a Specific Technology Audit
Berkol, A.; Kara, G.; Turk, A. (2016-09-08)
Technology audit activities arc carried out for assessment of firms' technological requirements, capacity or management capability. The aim of these assessments is to define the weaknesses of firms and develop actions in order to improve firms' technological capacity and/or technology management capability. Generally these activities are implemented with survey questionnaires. These questionnaires can be filled by managers of firms or can be implemented as an interview by independent experts. However, evalu...
Separation simulation for helicopter external stores and generation of safe separation envelopes
Kapulu, Özge; Tekinalp, Ozan; Department of Aerospace Engineering (2015)
In many aerospace applications, simulations are used to predict the behavior of the flight vehicle and reduce the number of flight tests required. In this thesis modeling and development of separation simulation tool for helicopter external stores is carried out. Detailed explanations of mathematical modeling, procedure of store separation analysis and collision detection approach from flight dynamics point of view are presented. The nonlinear mathematical model of armed configuration of Black Hawk helicopt...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. O. Türe, “Shape optimization of helicopter subfloor intersection element under crash loading,” M.S. - Master of Science, Middle East Technical University, 2017.
