Structural Design option - MSc in Aerospace Vehicle Design

• Professor Shijun Guo

To introduce the composite materials, manufacturing techniques and analysis methods for the design of aerospace composite structures.

• Introduction; Types of composite materials, especially FRP composites;
• Overview of composites manufacturing techniques;
• Micromechanics and macro mechanics for stiffness and strength analysis of a FRP ply; Macro mechanics, constitutive equation, stiffness and strength analysis of a FRP laminate; Thermal and moisture residual stresses in a FRP laminate;
• Stress analysis of an open section FRP composite structure subjected to various loadings;
• Stress analysis of a closed section FRP composite structure subjected to various loadings;
• Design guidelines and examples for composite structure design and analysis;
• Computer programmes for laminate stress, buckling of laminate and stiffened skin and
• sandwich panels with FRP composite facing skins.

The classroom assignment on composite manufacturing techniques will take place towards the end of this module. The date and time will be confirmed by the tutor. The assignment is a one hour written paper that will take place in the classroom under exam conditions. This assignment is formally assessed and is worth 25% of the marks available for this module.

• Dr Wenli Liu

To provide an understanding of the theories of Fatigue and Fracture Mechanics and show how these structural concepts are applied to the design and testing of aircraft structures and Airworthiness Certification.

• Design awareness: Philosophies of design against fatigue and design for damage tolerance: i.e. safe-life, fail-safe and damage tolerance.
• Fatigue analysis: Traditional S-N curve approach: calculation of crack initiation life; mean stress effect, notch effect; Miner’s cumulative damage rule for variable amplitude loads.
• Aircraft fatigue loads: Typical aircraft load spectra for use in the laboratory and computer simulation.
• Fracture Mechanics: Basic Theory of Linear Elastic Fracture Mechanics (LEFM): Stress Intensity Factor, fracture toughness, strain energy release rate; plane stress and plane strain, crack tip plastic zone; residual strength; prediction of fatigue crack growth.
• Damage Tolerance: Damage tolerant design methods. Fatigue monitoring in flight/service. Inspection methods. CAA and FAA Regulations and their relationship to Airworthiness Certification Material selection.
• Classroom exercise will be assigned during this module to further enhance the learning objectives. Completed work will be collected in by the tutors at the end of the module.

• Dr Ioannis Giannopoulos

The course is aimed at giving potential Finite Element USERS basic understanding of the inner workings of the method.  

The objective is to introduce users to the terminology, basic numerical and mathematical aspects of the method. This should help students to avoid some of the more common and important user errors, many of which stem from a "black box" approach to this technique. Some basic guidelines are also given on how to approach the modelling of structures using the Finite Element Method. 

• Background to Finite Element Methods (FEM) and its application
• Introduction to FE modelling: Idealisation, Discretisation, Meshing and Post Processing
• Tracking and controlling errors in a finite element analysis. ‘Do’s and don’ts’ of modelling.
• Illustration of basics of FEM using the Direct Stiffness method to define both terminology and theoretical approach.
• Problems of large systems of equations for FE, and solution methods.
• FE method for continua illustrated with membrane and shell elements.
• Nonlinear analysis in FEM and examples
• NASTRAN application sessions

• Understand the underlying principles and key aspects of practical application of FEA to structural problems
• Understand the main mathematical and numerical aspects of the element formulations for 1D, 2D and 3D elements
• Build and analyse finite element models based on structural and continuum elements with proper understanding of limitations of the FEM
• Interpret results of the analyses and assess error levels
• Critically evaluate the constraints and implications imposed by the finite element method
• Extend their knowledge and skills to the FE analysis of more complex structures on their thesis work.

• Dr Wenli Liu

Provide a fundamental understanding of the buckling of thin walled structures and the ability to calculate the buckling load of a component.

• The buckling of thin plates and thin-walled sections using the Rayleigh-Ritz method of analysis. Alternative methods of buckling analysis.
• Timoshenko's method for columns.
• Exact solution of differential equations.
• Approximate solution of differential equations, Finite difference method, Galerkins method, Theoretical post-buckling analysis of plates in compression.
• The concept of effective width for thin plates.
• The behaviour of imperfect plates,Torsional-Flexural buckling of thin-walled open section columns.
• The buckling behaviour and failure of stiffened panels, crippling of thin-walled sections, stiffened shear webs.
• This module has additional accompanying tutorials and workshops as required, plus a laboratory demonstration of the compressive buckling failure modes of struts and stiffened panels.

• Professor Shijun Guo

To introduce the importance of aeroelastic phenomena, basics of aeroelasticity and analysis methods for the design of aircraft structures.

• Introduction (historical review, aeroelastic phenomena and design requirements);
• Structural and aerodynamic stiffness;
• Static aeroelasticity: torsional divergence, control effectiveness and reversal;
• Structural vibration and modal analysis;
• Aerodynamic loads on an oscillating lifting surface;
• Characteristics of flutter and important design parameters;
• Methods for aeroelastic analysis (divergence and flutter speed prediction);
• Gust response of rigid and flexible airframes;
• This module has additional accompanying tutorials and computer workshops as required.

On successful completion of this module a student should be able to:
1. Recognise the importance of aeroelastic phenomena and design requirements;
2. Explain the theory of aeroelasticity including static and dynamic aeroelastic problems;
3. Illustrate the approach for evaluating divergence and flutter speed of aircraft structures;
4. Demonstrate the application of knowledge to the practical design aspects of aerospace structures using available PC based computer programs;
5. Apply their knowledge and skills to estimate the flutter speed of the Group Design Project aircraft.

• Professor Howard Smith

The aim of this module is to provide knowledge of the Atmosphere and of the aerodynamic characteristics of a conventional aircraft in the context of its mechanics of flight.

• Atmosphere Mechanics: structure of the atmosphere, international standard atmosphere model, design atmospheres.
• Air Data Systems: Pitot-static systems. Altitude, airspeed and Mach number. Air temperature and airflow direction detectors.
• Basic flight mechanics: forces acting on the aircraft, balance and trim. The forces of lift and drag and their characteristic dependencies.
• Powerplant thrust characteristics: effects of weight, altitude, temperature and Mach number.
• Aircraft axis systems.
• The aerodynamic aspects of the outline design process of a transport aircraft.
This module has additional accompanying flying laboratory tutorials in the Jetstream Aircraft. See Flight Experimental Methods (FXM).

• Dr Craig Lawson

To facilitate students’ in gaining fundamental knowledge of the theory of conventional fixed wing aircraft performance to a level suitable for an aerospace vehicle designer. In particular, to provide students with the ability to apply aircraft performance theory, practically in the context of aerospace vehicle design.

• Introduction to Aircraft Performance
• Aircraft Cruising Performance
• Aircraft Climb and Descent Performance
• Aircraft Take-off and Landing Performance
• Aircraft Manoeuvre Performance
• Flight Path Performance Estimation
• Aircraft Performance Measurement

A classroom exercise will be completed during this module. Solutions will be collected in by the tutor at the end of the module.

To introduce students to the engine and aircraft-related aspects of the propulsion system, with the primary emphasis being placed on gas turbine engines.

• Simple gas turbine theory illustrating the effect of gas turbine cycle parameters.
• Relations between specific fuel consumption, specific range and thermal and overall efficiencies for various engine types including turbo-props.
• Choice of cycle for various applications.
• Brief assessment of engine size required and engine / airframe matching including the importance of the airworthiness performance requirements.
• Impact of engine rating on engine / airframe matching.
• Impact on engine installation of various systems required by the aircraft.

• Dr Alastair Cooke

To provide an introduction to the fundamentals of aircraft stability and control.

• Stability, control and handling qualities relationships.
• Aircraft aerodynamic controls.
• Static equilibrium and trim.
• Longitudinal static stability, trim, pitching moment equation, static margins.
• Lateral-directional static stability.
• Introduction to dynamic stability, first and second order responses.
• Equations of motion and modal characteristics.

On successful completion of this module the students will be able to:

• Describe the concepts of: trim, stability and control.
• Describe methods of providing static stability for a conventional aircraft.
• Describe the modes of motion of a conventional aircraft.

• Dr Hessam Ghasemnejad

To provide students with an understanding of the considerations necessary when designing safe and crashworthy aircraft.

• Introduction to Crashworthiness.
• Local collapse of structures: Collapse of thick walled sections: axial, bending and torsion. Collapse of thin walled sections, energy absorption and failure modes.
• Global collapse of structures: Virtual work approach to calculation, identification of collapse mechanism, geometric and large deformation effects.
• Crash energy management: Modes of energy absorption, collapse mechanism control, dynamic effects.
• Crashworthiness design features: Context of structural design in overall crashworthiness, relation to other design aspects. Issues specific to individual applications, including aircraft, cars, trains.
• Occupant protection: Injury mechanisms, crash dummies and injury criteria.
• Test and analysis methods: Experimental crash tests, hybrid analysis methods.

The aim of this module is to introduce students to the role of Computer Aided Design technologies in a modern Integrated Product Development process and provide hands-on experience of CAD using the CATIA v5 software.

• Introduction to Integrated Product Development (IPD) for aircraft design
• Overview of Computer Aided Design, Manufacture and Engineering tools and their role in IPD
• Introduction to CAD modelling techniques:
o Solid Modelling
o Assembly Modelling
o Parametric Design
o Surface Modelling
o Drafting
• Hands on CATIA exercises using CATIA v5 including fuselage and wing design exercises
• Using CATIA for the Group Design Project.

• Professor Howard Smith

To ensure that while the student designs his/her structure he/she is aware of the constraint imposed by manufacturing and operational considerations.

The influence of designing for maintainability will have a considerable effect on the design of both the structure and aircraft systems and a considerable effect on the life cycle cost of the vehicle. The taught material will have immediate practical application to the Group Design Project.

• Wing configuration and manufacture. Fuselage layout and manufacture.
• Flaps and control surfaces: Structural configuration and mechanisms.
• Assembly and production processes.
• Maintainability and accessibility.
• Design for Assembly.
• Design for Maintainability.

A classroom exercise will be completed during this module. Solutions will be collected in by the tutor at the end of the module.

• Dr Craig Lawson

To expand the students’ knowledge of airframe systems, their role, design and integration. In particular, to provide students with an appreciation of the considerations necessary when selecting aircraft power systems and the effect of systems on the aircraft as a whole.

• Introduction to airframe systems
• Systems design philosophy and safety
• Aircraft secondary power systems
• Aircraft pneumatics power systems
• Aircraft hydraulics power systems
• Aircraft electrical power systems
• Flight control power systems
• Aircraft environmental control
• Aircraft oxygen systems
• Aircraft icing and ice protection systems
• Aircraft emergency systems
• Aviation fuels and aircraft fuel systems
• Engine off-take effects
• Fuel penalties of systems
• Advanced and possible future airframe systems

• Dr Ioannis Giannopoulos

To introduce students to the techniques of detail stressing as practised in the aerospace industry.

• The structural function of aircraft components. Definition of Limit, Proof and Ultimate loads and Factors for Civil and Military aircraft
• Basic formulas for stress analysis. Stress strain curves for metallic materials. Material equivalents. Concept of Reserve Factors (RF) and Margins of Safety (MS)
• Material data. Design guidelines for mechanically fastened joints. Lugs. Strength of bolted/riveted joints. Usage of approved aerospace components
• Structures under bending and compression. Euler buckling, flange buckling, inter-rivet buckling. Buckling of struts and plates. Shear buckling of webs
• Generalized stress strain curves
• Plastic bending and form factors
• Rivet and bolt group analysis
• Analysis of thin walled structures
• Preparation of a detailed Stressing Report and Reserve Factor summary tables for a classroom exercise to be completed during this module.

• Apply the principals and techniques in stress analysis and airworthiness requirements to size basic aircraft structural components
• Evaluate the strength of a component and determine its ability to support an applied load
• Compare, propose and select metallic materials suitable for use in aircraft structures
• Acquire transferable skills to allow effective communication with company stress engineers.

• Dr Alastair Cooke

To provide students with flights in the Jetstream Flying Laboratory in support of the lecture course in Aircraft Aerodynamics, Aircraft Performance, and Aircraft Stability and Control. These flights are key for students who are from a non-aeronautical background, and will also serve as a refresher for the remaining students.

• Measurement of aircraft drag and effect of flap (AD, SD & ASD).
• Aircraft longitudinal static stability (AD & SD)
• Avionic demonstration and inertial system accuracy (ASD)
• Dynamic stability modes (AD, SD & ASD)

• Describe the flight test techniques used to measure simple aerodynamic parameters and assess navigation systems.
• Describe the dynamic stability modes of a conventional aircraft.

• Professor Howard Smith

To introduce students to the process of aircraft conceptual design and support structural layout work, were required, through participation on the Group Design Project.

• Aircraft project design process
• Drag and weight prediction:  Drag sources, polar, estimation, weight prediction methods. Layout aspects:  wing; power plant; landing gear; fuselage
• Simple tail plane and fin layout
• Overall project synthesis and case study of aircraft
• Structural requirements, - strength, stiffness and serviceability
• Analysis of requirements, sources of load and reference datum lines
• Role of structural members - main plane, stabilisers, auxiliary surfaces, fuselage
• Analysis and sizing methods - elementary theories
• Departures from elementary theories - constraint effects, cut outs, buckling.

This module has additional accompanying tutorials and workshops as required.

A miniature group PBL conceptual design project will be completed during this module. Solutions will be collected in by the tutor at the end of the module.

To provide students with a general understanding of the design of landing gear and the associated systems and the associated challenges of integrating them into an airframe. The module also aims to highlight the implications that the design of the landing gear has on the aircraft layout and structure.

• Landing gear layout (Skids, flying boats, tricycle, bicycle, multi-wheel etc.)
• Ground flotation (Aircraft Classification Number [ACN] & Pavement Classification Number [PCN])
• Tyres (Failure modes and causes and wear. Radial vs. Cross-ply)
• Wheels (Bowl type vs. ‘A’ type)
• Brakes
• Struts (Cantilever vs. Trailing arm)
• Loads (Ground loads and airframe attachment loads)
• Shock Absorbers (Single acting and double acting. Compression curves)
• Retraction
• Ground manoeuvring (Steering)

• Evaluate the various landing gear layout schemes and assess which is best for any particular aircraft layout.
• Demonstrate a systematic understanding of the procedures and steps for positioning the landing gear on the aircraft (longitudinally and laterally).
• Critique historic landing gear designs and understand why various design decisions have been made and analyse their impacts on the aircraft.

• Professor Howard Smith

To provide students with knowledge of all the main loading cases including those encountered on the ground, in the air and those induced by the environment. This is the initial module on the MSc course, its contents are fundamental and the taught material will have immediate practical application to the Group Design Project.(GDP).

• Standard requirements, their application, interpretation and limitations.
• Flight loading cases: symmetric manoeuvres, pitching acceleration, gust effects, asymmetric manoeuvres, roll and yaw.
• Balance equations: rigid airframe response, control movements and forces.
• Ground loading cases: Airload distributions:
• Structural design data: Inertia relief and effect on shear force, bending moment and torque diagrams.
• Factors: load factors, their basis and restrictions.

This module has additional accompanying support sessions to assist application of the material to the GDP.

A classroom exercise will be completed during this module. Solutions will be collected at the end of the module and archived for future inspection.

To provide students with an introduction to the aircraft airworthiness as well as knowledge of reliability assessment methods, safety assessment methods, and certification issues associated with the design of Aircraft Systems (including weapon systems and survivability). To familiarise the students with current air accidents investigation techniques and processes.

• Airworthiness
• Reliability
• Reliability requirements – JAR25-AC.1309
• Probabilities of failure, MTBF, MTBR, etc.
• Reliability models – series and parallel systems, common mode failures
• Safety Assessment Analysis Methods
• Failure Modes and Effects Analysis (FMEA)
• Fault Tree Analysis (FTA)
• Reliability predictions
• Common Cause Analysis (CCA)
• System Safety Assessment Process
• Functional Hazard Analysis (FHA)
• Preliminary System Safety Assessment (PSSA)
• Air Accidents Investigation

A classroom exercise will be completed during this module. Solutions will be collected in by the tutor at the end of the module.

• Professor Shijun Guo

To provide student with the basic knowledge and understanding of structural vibration modes and dynamic response through theory and experiment, and a good understanding of finite element analysis and application.

• Introduction to a mechanical system vibration and structural dynamics
• Free, forced and damped vibration theory and experiment
• Eigenvalue problem solution methods
• Direct time integration methods
• Lumped and consistent mass matrices in finite element modelling
• Structural dynamic response analysis
• Application of FEM to aerospace structures

On successful completion of this module a student should be able to:
1. Theoretical and analysis of simple structures using a first principle approach.
2. Relate how inertial and dynamic terms are included in finite element model.
3. Relate how to calculate and analyse structural modes in frequency domain;
4. Relate how to calculate and analyse dynamic response of simple structures