MSc Individual Project

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Information about MSc Individual Project
Design

Published on November 20, 2008

Author: FlorianoB

Source: slideshare.net

Description

MSc Individual Project

A free standing wing mast for a recreational cat-boat Dott. Ing. Floriano Bonfigli in collaboration with supervised by Dr. John M Hodgkinson

Outline of talk Introduction – Sailing with composites at Imperial College… • What a free standing wing mast is – No more columns but wings!!! • Manufacturing method and raw materials – A “cheap” production • is possible! The mast cross-section – An innovative airfoil … • The mast engineering – A quite fast and reliable optimization • process Conclusions and further work – A prototype is needed! •

Sailing with composites at Imperial College… • Designing with composite materials is not very straightforward… • Even at the highest level!

Sailing with composites at Imperial College… • A free standing wing mast for a recreational trailer cat- boat • A challenging real case study

What a free standing wing mast is 1. A simpler then safer structure With a keel stepped mast, there are just two very accessible joints to check

What a free standing wing mast is 2. Much more room to enjoy on board! Every naval architect should look with favour upon free standing masts.

What a free standing wing mast is 3. No more bulky columns but wings!!! A wing mast which cannot rotate is basically useless. The mainsail efficiency may increase up to 30%.

Manufacturing methods - raw materials 2 yacht projects Most convenient process and 5 mast builders were reviewed Get the right Pertinent raw materials resin! Which fibre? UD ply data Mechanical properties are strongly recommended Structure modelling

A “cheap” production is possible • The autoclave method is not the rule Vacuum bagging and heater blankets were adopted for the 5 parts building the mast

A “cheap” production is possible • Reduced degradation • It is twice Low from as expensive water ingress temperature - + as vinyl ester curing and four times • Increased as expensive epoxy resistance as polyester to osmosis Long term gain of better durability, therefore better resale value Higher value for money

The mast cross-section NACA section database 6-digit series 63-0xy X-Foil 6x-020 65-020 …

The mast cross-section (II) 65-020 170 symmetrical Profili airfoils Eppler E838

The mast cross-section (III) 2. Fully aerodynamic mast, with composite 1. Masts sharply cut sail tracks This solutions allows to save some composite Airflow and to maintain its aerodynamic efficiency

The mast engineering – starting point Boundary conditions Wind force Sail area Mast geometry Classical structural analisys Classical modelling approach Young’s modulus Density Quasi- isotropic laminate Ply number properties

The mast engineering – FEM analisys at 1. Method analysis New mast-sail interaction model 2. Product analysis Weight optimization

1. Method Analysis • Loads given through the track • Sail acting like a membrane Wind pressure concentrated in a node located into the sail centre. Node connected along the rear end of the mast by a set of RBE3 elements.

1. Method analysis (II) Old way New model

Graphs Lateral deflections, load uniformly distributed 200 Displacement, mm 150 100 50 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 Mast height, mm Lateral deflections, new approach 100 Displacement, mm 80 60 40 20 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 Mast height, mm

2. Product analysis Optimization process • The model is firstly run. • Secondly, it is characterized in terms of weight, lateral deflections and failure index map. SF>2 SF>2 • Then, the most critical areas are detected and reasons for that stated. • Final conclusions and next model to test are proposed. Lateral displacements A typical failure index map

2. Product analysis (II) Excel starting point, 16 UD quasi-isotropic lay-up 14 UD lay-up, less 0° plies 14 UD plies, less 90° plies 4 zone optimized lay-up 12 UD lay-up, less 0° plies anti-symmetric lay-up version woven fabric version

2. Product analysis (III)

Conclusions and further work • Design of a free standing wing mast for a recreational boat • Innovative solutions – Aerodynamic cross-section – Mast-sail interaction model • Lighter products • A prototype is needed… – To validate the manufacturing process – To validate the FEM model

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