A model for solar powered aircraft preliminary design

2008 ◽  
Vol 112 (1128) ◽  
pp. 57-78 ◽  
Author(s):  
E. Rizzo ◽  
A. Frediani
Keyword(s):  
Mathematical Model ◽  
Great Emphasis ◽  
Preliminary Design ◽  
Research Activities ◽  
Solar Powered ◽  
Flying Wings ◽  
Long Endurance ◽  
Near Future ◽  
Aircraft Configurations ◽  
Aerodynamic Configuration

Abstract Solar powered aircraft are becoming more and more interesting for future long endurance missions at high altitudes, because they could provide Earth monitoring, telecommunications, etc. without any atmospheric pollution and, hopefully in the near future, with competitive costs compared with satellites. The research activities carried out till now have been mainly focused on flying wings or conventional aircraft configurations, with a great emphasis on the technological aspects. The present paper aims to define a mathematical model for solar powered aircraft preliminary design, valid independently of the aerodynamic configuration. A preliminary analysis is carried out in order to simulate Helios and the results are compared with those available from the flights of this aircraft. The proposed mathematical model is used also to compare four different aircraft configurations, namely: a flying wing, a conventional aircraft, a twin boom aircraft and a biplane aircraft. The results obtained are discussed in the paper and an optimum aircraft is analysed.

scholarly journals Feasibility Study of Solar Powered Unmanned Aerial Vehicle

2022 ◽  
pp. 8-13
Author(s):  
Shiva Prasad U ◽  
Kiran Ravi Kumar ◽  
Vinaya Acharekar ◽  
Rishika Radhakrishnan
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Conceptual Design ◽  
Design Methodology ◽  
Preliminary Design ◽  
Vast Number ◽  
Aerial Vehicles ◽  
Aerial Vehicle ◽  
Solar Powered ◽  
Long Endurance ◽  
Surveillance Applications

High Altitude Long Endurance Unmanned Aerial Vehicles (HALE UAVs) could provide an improved service and/or flexibility at a reduced cost over existing systems for a vast number of civil patrol and surveillance applications. This document looks into the Feasibility and Conceptual Design of Solar Powered UAV for HALE applications. It mentions the advancements in technology of the components required to build an efficient solar powered UAV. It also provides a preliminary design methodology that can be adopted for the conceptual design of Solar Powered UAV. It also emphasizes the Aerodynamic difficulties that are faced in HALE configurations.

scholarly journals On the Handling Qualities of Two Flying Wing Aircraft Configurations

Aerospace ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 77
Author(s):  
Luís M. B. C. Campos ◽  
Joaquim M. G. Marques
Keyword(s):  
Weak Coupling ◽  
Point Of View ◽  
Mode I ◽  
Lateral Stability ◽  
Handling Qualities ◽  
Short Period ◽  
Flying Wings ◽  
Aircraft Configurations ◽  
Dutch Roll ◽  
Fully Coupled

The coupling of the longitudinal and lateral stability modes of an aeroplane is considered in two cases: (i) weak coupling, when the changes in the frequency and damping of the phugoid, short period, dutch roll, and helical modes are small, i.e., the square of the deviation is negligible compared to the square of the uncoupled value; (ii) strong coupling, when the coupled values may differ significantly from the uncoupled values. This allows a comparison of three values for the frequency and damping of each mode: (i) exact, i.e., fully coupled; (ii) with the approximation of weak coupling; (iii) with the assumption of decoupling. The comparison of these three values allows an assessment of the importance of coupling effects. The method is applied to two flying wing designs, concerning all modes in a total of eighteen flight conditions. It turns out that lateral-longitudinal coupling is small in all cases, and thus classical handling qualities criteria can be applied. The handling qualities are considered for all modes, namely the phugoid, short period, dutch roll, spiral, and roll modes. Additional focus is given to the pitch axis, considering the control anticipation parameter (CAP). The latter relates to the two kinds of manouever points, where damping vanishes, that are calculated for minimum speed, take-off, and initial and final cruise conditions. The conclusion compares two flying wings designs (the “long narrow” and “short wide” fuselage concepts) not only from the point of view of flight stability, but also from other viewpoints.

scholarly journals ANALYTICAL METHODS FOR CALCULATING FAN AERODYNAMICS

2015 ◽  
Vol 55 (6) ◽  
pp. 373
Author(s):  
Jan Dostal ◽  
Jan Kuzel
Keyword(s):  
Mathematical Model ◽  
Analytical Methods ◽  
Preliminary Design ◽  
Computer Programme ◽  
Aerospace Research ◽  
Model Based ◽  
The Creation ◽  
The Mathematical Model ◽  
Measuring Unit

This paper presents results obtained between 2010 and 2014 in the field of fan aerodynamics at the Department of Composite Technology at the VZLÚ aerospace research and experimental institute in Prague – Letnany. The need for rapid and accurate methods for the preliminary design of blade machinery led to the creation of a mathematical model based on the basic laws of turbomachine aerodynamics. The mathematical model, the derivation of which is briefly described below, has been encoded in a computer programme, which enables the theoretical characteristics of a fan of the designed geometry to be determined rapidly. The validity of the mathematical model is assessed continuously by measuring model fans in the measuring unit, which was developed and manufactured specifically for this purpose. The paper also presents a comparison between measured characteristics and characteristics determined by the mathematical model as the basis for a discussion on possible causes of measured deviations and calculation deviations.

scholarly journals Aero-Structural Optimization of Joined-Wing Aircraft

2017 ◽  
Vol 2017 (4) ◽  
pp. 48-63
Author(s):  
Miłosz Kalinowski
Keyword(s):  
Structural Optimization ◽  
Search Algorithm ◽  
Optimization Methods ◽  
Global Search ◽  
Preliminary Design ◽  
Electric Aircraft ◽  
Modular Algorithm ◽  
Lifting Surfaces ◽  
Joined Wing ◽  
Aircraft Configurations

Abstract Joined-wing aircraft due to its energy characteristics is a suitable configuration for electric aircraft when designed properly. However, because of the specific for this aircraft phenomenons (e.g. static indeterminacy of structure, aerodynamic interference of lifting surfaces) it demands more complicated methods to model its behavior than a traditional aircraft configurations. For these reasons the aero-structural optimization process is proposed for joined-wing aircrafts that is suitable for preliminary design. The process is a global search, modular algorithm based on automatic geometry generator, FEM solver and aerodynamic panel method. The range of aircraft was assumed as an objective function. The algorithm was successfully tested on UAV aircraft. The improvement of 19% of total aircraft range is achieved in comparison to baseline aircraft. Time of evaluation of this global search algorithm is similar to the time characteristic for local optimization methods. It allows to reduce the time and costs of preliminary design of joined-wing.

scholarly journals Machine Translation Research in Czechoslovakia

2002 ◽  
Vol 37 (4) ◽  
pp. 802-816 ◽  
Author(s):  
Jan Hajič ◽  
Eva Hajičová ◽  
Alexandr Rosen
Keyword(s):  
Machine Translation ◽  
Theoretical Background ◽  
Short Description ◽  
Translation Research ◽  
Text Corpora ◽  
Research Activities ◽  
Traditional Approaches ◽  
Near Future ◽  
Future Plans

Abstract Machine translation research activities in Czechoslovakia starting in early the 60's are outlined, together with the basics of the theoretical background on which the parsing and representation levels have been based. Two more recent systems are described in more detail: APAC, working from English to Czech on INSPEC technical abstracts, and RUSLAN, which, translating from CZECH to Russian, was heavily taking advantage of the closeness between these languages. We conclude with a short description of the current project, which emphasizes the use of text corpora in combination with (more) traditional approaches. Many of the ideas we want to elaborate in the near future are present in the current project, and a word on future plans is also added.

Robust Concurrent Concept Selection and System Synthesis

1994 ◽  
Author(s):  
Wei Chen ◽  
Janet K. Allen ◽  
Farrokh Mistree
Keyword(s):  
Irrigation System ◽  
Preliminary Design ◽  
Continuous Variables ◽  
Engineering Systems ◽  
Concept Selection ◽  
Complex Engineering ◽  
Solar Powered ◽  
System Variables ◽  
Complex Engineering Systems

Abstract In this paper, we introduce a concurrent approach to preliminary system design by using a modification of Taguchi’s method of robust design. It is possible to model interactions among component concept selections and synthesis of system variables. This approach also can improve computational efficiency and provide more design knowledge for the conceptual design of complex engineering systems. This technique is effective in dealing with both discrete and continuous variables simultaneously in design. We illustrate our approach by the preliminary design of a solar powered irrigation system. The selections of critical component concepts are integrated with the determination of system variables, i.e., the thermodynamic operating parameters.

Performance Analysis of a Solar-Assisted Organic Rankine Cycle

2020 ◽  
Author(s):  
M. T. Nitsas ◽  
I. P. Koronaki
Keyword(s):  
Mathematical Model ◽  
Performance Analysis ◽  
Temporal Variation ◽  
Storage Tank ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Evaporation Temperature ◽  
Solar Powered ◽  
The Mathematical Model

Abstract The objective of this paper is the thermodynamic analysis of a solar powered Organic Rankine Cycle (O.R.C.) and the investigation of potential working fluids in order to select the optimum one. A dynamic model for a solar O.R.C. with a storage tank, which produces electricity is developed. The mathematical model includes all the equations that describe the operation of the solar collectors, the storage tank, the Rankine Cycle and the feedback between them. The model runs for representative days throughout the year, calculating the net produced energy as a function of the selected evaporation temperature for every suitable working fluid. Above that, the temporal variation of the systems’ temperatures, collectors’ efficiency and net produced power, for the optimum organic fluid and evaporation temperature are presented.

Emission Aspects of Biomass-Based Advanced Second Generation Bio-Fuels in IC Engines

2020 ◽  
pp. 44-64 ◽  
Author(s):  
R. Sakthivel ◽  
Mohanraj T. ◽  
Joseph John Marshal S. ◽  
Baranitharan P. ◽  
Tamilvanan A. ◽  
...  
Keyword(s):  
Low Cost ◽  
Research Community ◽  
Biomass Energy ◽  
Pollution Levels ◽  
Research Activities ◽  
Energy Needs ◽  
Energy Scenario ◽  
Ic Engines ◽  
Rapid Industrialization ◽  
Near Future

Rapid industrialization and growth in population in urban regions augment the pollution levels from transportation sectors, especially from diesel fleets. A wide array of research activities were carried out to satisfy the energy needs as well as reduce the emission levels, which poses a big challenge to the research community. In this situation, biomass-derived fuels provide a ray of hope to the research community to address the emission problem by adapting closed carbon cycle at low cost. This chapter gives an overview to the readers about the present energy scenario, biomass-based fuel, upgradation techniques for biomass fuel, and engine adaptability of biomass-based fuels. This chapter provides a clear glimpse of biomass energy, one of the potential energy resources in the near future.

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