Results 1 to 10 of about 684 (110)

Towards Design Optimization of Compliant Mechanisms: A Hybrid Pseudo-Rigid-Body Model–Finite Element Method Approach and an Accurate Empirical Compliance Equation for Circular Flexure Hinges [PDF]

Biomimetics
Innovative designs such as morphing wings and terrain adaptive landing systems are examples of biomimicry and innovations inspired by nature, which are actively being investigated by aerospace designers.
Masoud Kabganian, Seyed M. Hashemi
doaj   +2 more sources

Experimental and Numerical Modal Analysis of a Composite Rocket Structure

Aerospace, 2023
Finite Element Analysis (FEA) is a powerful tool that can aid in the engineering design process to reduce cost and time. However, it is best used in conjunction with experimental data, through which its numerical results can be verified.
Taruansh Qaumi, Seyed M. Hashemi
doaj   +1 more source

Undamped Free Vibration Analysis of Functionally Graded Beams: A Dynamic Finite Element Approach

Applied Mechanics, 2022
A Dynamic Finite Element (DFE) method for coupled axial–flexural undamped free vibration analysis of functionally graded beams is developed and subsequently used to investigate the system’s natural frequencies and mode shapes. The formulation is based on
Aaron Gee, Seyed M. Hashemi
doaj   +1 more source

Multidisciplinary Design Optimization of a Re-Entry Spacecraft via Radau Pseudospectral Method

Applied Mechanics, 2022
The design and optimization of re-entry spacecraft or its subsystems is a multidisciplinary or multiobjective optimization problem by nature. Multidisciplinary design optimization (MDO) focuses on using numerical optimization in designing systems with ...
Masoud Kabganian, Seyed M. Hashemi, Jafar Roshanian   +2 more
doaj   +1 more source

Effect of Stagger on Low-Speed Performance of Busemann Biplane Airfoil

Aerospace, 2022
In this study, the low-speed performances of the Busemann biplane were clarified, focusing on the relative contributions of the upper and lower elements to the total aerodynamic characteristics of the biplane.
Thai Duong Nguyen, Masashi Kashitani, Masato Taguchi, Kazuhiro Kusunose   +3 more
doaj   +1 more source

Multispectral Optical Remote Sensing for Water-Leak Detection

Sensors, 2022
Water losses from water distribution means have a high environmental impact in terms of natural resource depletion (water, energy, ecosystems). This work aims to develop an optical airborne surveillance service for the detection of water leaks (WADI ...
Jean-Claude Krapez, Javier Sanchis Muñoz, Christophe Mazel, Christian Chatelard, Philippe Déliot, Yves-Michel Frédéric, Philippe Barillot, Franck Hélias, Juan Barba Polo, Vincent Olichon, Guillaume Serra, Céline Brignolles, Alexandra Carvalho, Duarte Carreira, Anabela Oliveira, Elsa Alves, André B. Fortunato, Alberto Azevedo, Paolo Benetazzo, Alessandro Bertoni, Isabelle Le Goff   +20 more
doaj   +1 more source

New insights for mesospheric OH: multi-quantum vibrational relaxation as a driver for non-local thermodynamic equilibrium [PDF]

Annales Geophysicae, 2018
The question of whether mesospheric OH(v) rotational population distributions are in equilibrium with the local kinetic temperature has been debated over several decades.
K. S. Kalogerakis, D. Matsiev, P. C. Cosby, P. C. Cosby, J. A. Dodd, S. Falcinelli, J. Hedin, J. Hedin, A. A. Kutepov, A. A. Kutepov, S. Noll, S. Noll, S. Noll, P. A. Panka, C. Romanescu, J. E. Thiebaud, J. E. Thiebaud   +16 more
doaj   +1 more source

Reactive bromine in the low troposphere of Antarctica: estimations at two research sites [PDF]

Atmospheric Chemistry and Physics, 2018
For decades, reactive halogen species (RHSs) have been the subject of detailed scientific research due to their influence on the oxidizing capacity of the atmosphere and on the climate.
C. Prados-Roman, L. Gómez-Martín, L. Gómez-Martín, O. Puentedura, M. Navarro-Comas, J. Iglesias, J. R. de Mingo, M. Pérez, H. Ochoa, M. E. Barlasina, G. Carbajal, G. Carbajal, M. Yela   +12 more
doaj   +1 more source

Building the COllaborative Carbon Column Observing Network (COCCON): long-term stability and ensemble performance of the EM27/SUN Fourier transform spectrometer [PDF]

Atmospheric Measurement Techniques, 2019
In a 3.5-year long study, the long-term performance of a mobile, solar absorption Bruker EM27/SUN spectrometer, used for greenhouse gas observations, is checked with respect to a co-located reference Bruker IFS 125HR spectrometer, which is part of the ...
M. Frey, M. K. Sha, M. K. Sha, F. Hase, M. Kiel, M. Kiel, T. Blumenstock, R. Harig, G. Surawicz, N. M. Deutscher, K. Shiomi, J. E. Franklin, H. Bösch, H. Bösch, J. Chen, M. Grutter, H. Ohyama, Y. Sun, A. Butz, A. Butz, G. Mengistu Tsidu, D. Ene, D. Wunch, Z. Cao, O. Garcia, M. Ramonet, F. Vogel, J. Orphal   +27 more
doaj   +1 more source

Benchmarking and improving algorithms for attributing satellite-observed contrails to flights [PDF]

Atmospheric Measurement Techniques
Condensation trail (contrail) cirrus clouds cause a substantial fraction of aviation's climate impact. One proposed method for the mitigation of this impact involves modifying flight paths to avoid particular regions of the atmosphere that are conducive ...
A. Sarna, V. Meijer, R. Chevallier, A. Duncan, K. McConnaughay, S. Geraedts, K. McCloskey   +6 more
doaj   +1 more source