Sergiu Petre Iliev

Imperial College London | Imperial · Department of Aeronautics

Tension, compression, three-point bending and indentation experiments are conducted on high purity Indium at room temperature and low strain rates. The material displays a ductile viscoplastic response, found to be size-independent in tension and compression. Simple analytical models are constructed to aid interpretation of the test results and det...

An accurate forecast of flare and coronal mass ejection (CME) initiation requires precise measurements of the magnetic energy buildup and release in the active regions of the solar atmosphere. We designed a new space weather mission that performs such measurements using new optical instruments based on the Hanle and Zeeman effects. The mission cons...

This paper forms part of the 'Everplane' Group Design Project and aims to present the Vehicle Definition of an autonomous high-altitude long-endurance concept aircraft, designed for flying continuously over one month in an environmentally sustainable manner. The platform has the capability of acting as an aerosattelite, providing affordable interne...

Our team has analyzed the possible purpose of our colony ship in the future, by thinking of plausible futuristic scenarios. We designed our project for a relevant and clear representation of the colony and the life an inhabitant would have aboard it. By combining 3D graphics with scientific concepts we hoped to create a clear depiction of all issue...

This paper includes the response to all questions in the second Numerical Analysis assignment. It is designed to be used in conjunction with the files (MATLAB Scripts) attached to the digital archive that contains this PDF document. The format is based on the guide provided by Prof. Denis Doorly. All MatLab Scripts are available upon request.

We present compression and instrumented indentation experiments on high-purity Indium, at temperatures from 22 to −100 °C. A strong indentation size effect is detected at all temperatures, corresponding to a large material length-scale. Therefore the large length-scale is not a consequence of creep mechanisms but an intrinsic property of the materi...

The following paper presents a lunar base proposal analyzing the potential scientific and technical purpose of such a base, optimum location, and design as well as cost and construction timeline estimates. Finally, the major challenges are addressed. This paper has been created as part of the 2016 Planetary Exploration Course in Kiruna, Sweden.

The objective of this paper is to present a computational fluid dynamics solution to the one-dimensional Euler equations of compressible flow by using a two-step Lax-Friedrichs scheme. In order to quantify the accuracy of the solver, it has been applied to the Riemann shock tube problem and results have been analyzed. The paper is written to be use...

The program XFOIL 6.99 was used in in simulating the flow over a novel aerofoil using both the inviscid and viscous solvers to assess the evolution of the pressure coefficient (Cp) and skin friction coefficient (Cf) as well as the boundary layer parameters of displacement and momentum thickness for two different Reynolds numbers (Re1=5 x 10 5 and R...

The following paper presents the discretisation and finite difference approximation of the one-dimensional advection-diffusion equation with the purpose of developing a computational model. The stability and performance of various discretisation schemes are assessed and form the basis of a discussion on the theory learned as part of the Computation...

The Imperial College London high speed aerodynamics laboratory was used in analysing the limitations of 1D compressible flow theory in determining flow parameters in a de Laval converging-diverging nozzle followed by a constant-area channel section. A PID controller was used to maintain a given settling chamber stagnation pressure constant, whilst...

The following paper presents the comparison of theoretical and experimental results following the ‘Shear flow in structural sections’ laboratory. It is structured based on the questions-answers template provided and is designed to be read in conjunction with the data and figures included in the Appendix. Three wing structural sections were investig...

The following paper constitutes the final report on the design of a twin turbofan transcontinental business jet. The cabin layout has been chosen and the fuselage dimensions deduced. Furthermore, an optimum aerofoil design was identified and the dimensions of the wing and those of the high lift devices were calculated. The incorporation of novel id...

This is a two part paper addressing the AirFrame Design coursework problems. The first part presents the buckling analysis of an aluminium alloy unlipped channel section. Following the linear static and buckling analysis of a strut with spans ranging from 0.2m to 4m with two constraint configurations to maintain a simply supported condition, it was...

Following the linear elastic finite elements analysis (FEA) of an elliptical isotropic steel laminate subjected to a pressure loading, using two levels of structured discretisation (coarse/fine mesh) that incorporated only quadrilateral elements, a comparison with the NAFEM benchmark included in Annex I was carried out. This paper presents the rela...

The following paper aims to characterise the Control of a Twin Rotor Multivariable System (TRMS) and to progressively develop a system capable of controlling it. The paper is structured in two parts, with a theoretical and experimental focus respectively. For the first part, it was found that simple linear control theory can be used to model the TR...

A saltatorial robot of 12 cm at its widest point weighing under 28g capable of remote operation thigh a direct line of sight infrared controller was designed built and tested. It achieved a jumping distance of only 37 mm upon testing which is an order of magnitude less than that anticipated by the design and simulations. The following paper present...

The purpose of this paper is to present the roles, skills and sources of motivation for student volunteers within the Imperial College Union, whilst making a comparison with the situation at a national level in Great Britain and identifying areas of improvement at a personal and organizational level. Everything will be presented from the authors’ p...

Following the tensile testing of CFRP laminate specimens in four configurations (0, 90, 30, (0/0/±45)S) it was possible to determine material stiffness parameters (E11, ν12, E22, ν21, G12, Ex, νx) which proved to be consistent with previous experiments [1] [2] [3]. This paper presents the experimental data analysis with the purpose of compari...

Following the wind tunnel testing of a swept uniformly tapered half wing with straight edges at an average Re number of 5E+05 and at 6 angles of attack (0, 4, 6, 9, 11, 15), pressure distribution data for three sections was obtained. This paper assesses the reliability of the inviscid computational ‘panel method’ and thin aerofoil theory in p...

The 'Paragon' dual system concept forms the subject of this paper. It aims to show how future materials such as graphene can create higher performances and enable future generations of Airbus planes to be lighter and more efficient, whilst offering a more engaging flight experience to the passengers. It has two parts: (I) replacing conventional win...

The aim of this report is to calculate the performance parameters and dimensions required for a ramjet engine, given initial design operating conditions. A code was assembled to do so; this was subsequently used to explore the effects on thermodynamic cycle and propulsive efficiency of each of the different input parameters. The expected correlatio...

The model intends to address the twin issues of the lack of clean water and the high primary and secondary education dropout ratio, especially of young girls by setting up a community hub with certain services being offered. The business model on which our solution is built is a co-operative with a Corporate Social Responsibility initial funding...

Following the wind tunnel testing of an inverted twin-jet aircraft model, with an adjustable tailplane, at an average Re number of 3.63E+05, it was possible to determine various quantities describing its longitudinal stick-fixed static stability, in three configurations (tail attached at -3, +1 and tailless). When comparing the results with value...

The following report presents the Scanning Electron Microscopy (SEM) analysis of five specimens with the purpose of identifying various microstructural characteristics relevant to aerospace applications. A particular focus is given to the investigation of fracture failure. A triangular flying mantis hind-wing (Raptrix perspicua) reveals insights in...

Matlab Implementation of the following: Finite Order Approximation Heat equation solution Integration Method Mid-Point Rule vs. Gauss-Legendre Rule Trapezium Rule vs. Gauss-Legendre Rule Number Storage Bisection Method Newton-Raphson Method Secant Method

Following the ground vibration testing of a freely suspended aircraft model, stimulated periodically by two Goodman vibrators placed at mid span, it was possible to determine the first two natural frequencies [17.26 and 33.240 Hz]. When comparing the results with values previously established by two parties differences were consistent between simul...

Following the testing of a circular cylinder in an open circuit wind tunnel, with and without a trip wire attached at ±30 angle of attack, the effects of a turbulent boundary layer could be observed by measuring the pressure distribution around top half of the cylinder. This paper also contrasts the predictions of potential flow with those of boun...

This paper presents the design, construction process and testing of a reticular structure made from Al alloy components. A comparison between the theoretical structure behavior and experimental results will reveal only small deviations, within the safety margin, due to limited precision in manufacturing. Following multiple design iterations, cost a...

The experiment was performed in the Donald Campbell Wind Tunnel Laboratory on the 26 th of February, under the supervision of Mr Ben Clapperton with the objective of determining the lift and drag coefficients of a Cessna 172 airplane at various angles of attack (AOA) and two air speeds. After the analysis of data gathered from the test, the Reynold...

MatLab Scripts available upon request.

The experiment was performed in the Strain Measurement laboratory on the 12th of November, under the supervision of Mr Yuefeng Cui with the objective of determining the Young modulus and Poisson Ration of a sample of steel material using resistance strain gauges at room temperature. After the analysis of raw data gathered from the test, the average...

The purpose of this Parliamentary Office of Science and Technology (POST) note is to explain how waves can produce electricity and how Great Britain can implement this for a better, “greener” future through the use of a new Pelamis infrastructure.

We have designed a concept airplane in order to analyze the feasibility of passenger flight can be an ecological, no-emissions, means of travelling. Using relevant facts as well as combining conventional technology with well-researched concepts we hope to achieve realistic design, as far as our knowledge in high school can reach, that can be analyz...