An Evolutionary Approach To Microstructure Optimisation Of Stereolithographic Models

The aim of this work is to utilize an evolutionary algorithm to evolve the microstructure of an object created by a stereolithography machine. This should be optimised to be able to withstand loads applied to it while at the same time minimizing its overall weight.

Authors: Mahdavi S Haroun and Sean. Hanna
Publication: Proceedings of CEC2003, the Congress on Evolutionary Computation Year: 2003

Investigating The Use Of Stereolithography To Build Adaptive Robots

In nature, species have evolved to best suit their niches. Monkeys have evolved to have long arms and dextrous hands that enable them to climb trees and pick fruit. Lions, on the other hand, have evolved to be strong and fast so as to most effectively catch prey in the open savannah. Each species has therefore evolved in order to best cope with typical tasks that are encountered. This can be thought of as optimising to a narrow range of tasks. Human beings have the ability to live almost anywhere. Even early man was found in nearly all climates and surroundings. He is not the strongest, nor fastest, and he is not especially good at climbing trees either. What he has is the ability to think. Moreover, the ability to use tools to transform his body into what is needed for the environment. Weapons for hunting allow him to exceed the lion’s power, and clothing can keep him warm in otherwise inhospitable climates. Therefore he has a very wide range of skills, though none are of great magnitude.

Author: Sean Hanna
Author: Mahdavi S Haroun

Publication: Proceedings of ICARCV 2004 | full text (PDF)

Year: 2004

Modularity and Flexibility At The Small Scale: Evolving Continuous Material Variation with Stereolithography

In this paper, we introduce a technique by which the internal material properties of an object can be optimised at a microstructural level (5x10-5m) to counteract the forces that are applied to it. These can then be fabricated using the rapid prototyping method of stereolithography. The proposed technique is analogous to principles of mass customization and takes advantage of a flexible module to create complex structures in a manner that is computationally efficient and effective.

Author: Sean Hanna
Author: Mahdavi S. Haroun
Author:Mahdavi S. Haroun

Publication: Proceedings of the 23rd annual conference of the Association for Computer Aided Design in Architecture and the 2004 conference of the AIA Technology in Architectural Practice Knowledge Community | full text (PDF)

Year: 2004

Optimising Continuous Microstructures: A Comparison Of Gradient-Based and Stochastic Methods

Optimisation techniques are used by engineers to design structures to satisfy many criteria, such as high strength or low weight. Recent advances in computer controlled manufacturing technology have also allowed the construction of such structures to be automated, so that the machine plays a significant role in both design and building processes. The work in this paper investigates optimisation of a microstructure suited to a rapid prototyping technology known as stereo lithography that is capable of construction at a high resolution, currently around 0.05mm. Our technique is based on the seamless repetition of a tiny structural module over a large volume such that the overall object behaves as a continuous material. It is, in effect, operating at a scale between traditional large-scale manufacturing and nanotechnology.

Author: Sean Hanna
Author: Madhavi S. Haroun

Publication: Proceedings of SCIS & ISIS 2004. The Joint 2nd International Conference on Soft Computing and Intelligent Systems and 5th International Symposium on Advanced Intelligent Systems | full text (PDF)

Year: 2004