CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

PDF papers

Hits 1 to 6 of 6

_id 4805
authors Bentley, P.
year 1999
title Evolutionary Design by Computers Morgan Kaufmann
source San Francisco, CA
summary Computers can only do what we tell them to do. They are our blind, unconscious digital slaves, bound to us by the unbreakable chains of our programs. These programs instruct computers what to do, when to do it, and how it should be done. But what happens when we loosen these chains? What happens when we tell a computer to use a process that we do not fully understand, in order to achieve something we do not fully understand? What happens when we tell a computer to evolve designs? As this book will show, what happens is that the computer gains almost human-like qualities of autonomy, innovative flair, and even creativity. These 'skills'which evolution so mysteriously endows upon our computers open up a whole new way of using computers in design. Today our former 'glorified typewriters' or 'overcomplicated drawing boards' can do everything from generating new ideas and concepts in design, to improving the performance of designs well beyond the abilities of even the most skilled human designer. Evolving designs on computers now enables us to employ computers in every stage of the design process. This is no longer computer aided design - this is becoming computer design. The pages of this book testify to the ability of today's evolutionary computer techniques in design. Flick through them and you will see designs of satellite booms, load cells, flywheels, computer networks, artistic images, sculptures, virtual creatures, house and hospital architectural plans, bridges, cranes, analogue circuits and even coffee tables. Out of all of the designs in the world, the collection you see in this book have a unique history: they were all evolved by computer, not designed by humans.
series other
last changed 2003/04/23 13:14

_id 616c
authors Bentley, Peter J.
year 1999
title The Future of Evolutionary Design Research
source AVOCAAD Second International Conference [AVOCAAD Conference Proceedings / ISBN 90-76101-02-07] Brussels (Belgium) 8-10 April 1999, pp. 349-350
summary The use of evolutionary algorithms to optimise designs is now well known, and well understood. The literature is overflowing with examples of designs that bear the hallmark of evolutionary optimisation: bridges, cranes, electricity pylons, electric motors, engine blocks, flywheels, satellite booms -the list is extensive and evergrowing. But although the optimisation of engineering designs is perhaps the most practical and commercially beneficial form of evolutionary design for industry, such applications do not take advantage of the full potential of evolutionary design. Current research is now exploring how the related areas of evolutionary design such as evolutionary art, music and the evolution of artificial life can aid in the creation of new designs. By employing techniques from these fields, researchers are now moving away from straight optimisation, and are beginning to experiment with explorative approaches. Instead of using evolution as an optimiser, evolution is now beginning to be seen as an aid to creativity -providing new forms, new structures and even new concepts for designers.
series AVOCAAD
last changed 2005/09/09 08:48

_id 6e38
authors Hanna, A.S. and Lotfallah, W.B.
year 1999
title A fuzzy logic approach to the selection of cranes
source Automation in Construction 8 (5) (1999) pp. 597-608
summary This paper presents a fuzzy logic approach to select the best crane type in a construction project from the main crane types, namely, mobile, tower and derrick cranes. Each factor of the project is classified as being dynamic or static according to whether the factor does or does not depend on the particular project. Linguistic information about the suitability of each crane type with respect to each factor of the project is translated into either fuzzy sets (for static factors) or fuzzy if–then rules (for dynamic factors). The fuzzy rules are then aggregated into a fuzzy relation between the space of factor property and the space of crane efficiency. In a particular project the experts describe the property as well as the relative importance of each factor. The rules are then fired using the max–min extension principle, and the resulting efficiencies are aggregated with their importance weights. The process identifies the best crane as the one with the highest expected overall efficiency.
series journal paper
last changed 2003/05/15 19:22

_id 8f16
authors Pizarro, D.V., Price, D.L. and Beliveau, Y.J.
year 1997
title Auditory collision warning signals for crane operation
source Automation in Construction 5 (6) (1997) pp. 445-457
summary This study examined the effect that an auditory collision warning signal's pulse rate, pulse pattern, and onset distance had on subject braking responses in a simulated crane/overhead power line collision scenario. The experimental warning signal alerted subjects of their proximity to overhead power lines. The experimental taks required subjects to monitor a simulated auditory collision warning signal while simultaneously operating a single-axis driving simulation task. The driving task simulated an actual crane operator's mental workload required to navigate a crane and manipulate various loads. Subjects were required to initiate braking responses based on the information conveyed solely through the auditory collision warning system. No visual information was provided to the subjects to isolate the effects of the warning signal. Subjective ratings of the auditory warning signals were obtained to compare subjects' actual performance using the warning signal versus their subjective preferences. Results indicate that subjects were able to initiate appropriate braking responses while using an auditory collision warning signal with moderate onset distances and low pulse rates. The auditory pulse pattern did not have a large impact on subjects' braking responses except at extremely short onset distances. Overall, it was concluded that a pulsing auditory warning signal comprised of a moderate onset distance and low pulse rate could work effectively as a proximity warning device for mobile cranes.
series journal paper
last changed 2003/05/15 19:23

_id aa19
authors Rosenfeld, Y. and Shapira, A.
year 1998
title Automation of existing tower cranes: economic and technological feasibility
source Automation in Construction 7 (4) (1998) pp. 285-298
summary Tower cranes enjoy a long useful working life. Therefore, a vast population of cranes are still in use today that do not feature the advanced automation and sensor technologies such as those with which some of the new models are equipped. This paper examines the technological and economic feasibility of retrofitting existing tower cranes with semi-automatic devices for motion control. The proposed improvements are intended to enhance the cranes' efficiency and their capacity to meet the challenges of today's tightly scheduled construction projects. Based on work studies and analyses of craning cycles, the concept offered by the proposed improvements distinguishes between the long-distance navigation of the crane's hook and the fine maneuvering in the loading and unloading zones. The expected economic benefits resulting from the enhancement of the crane's performance, with regard to both types of motion, far exceed the cost of installing the various devices.
series journal paper
last changed 2003/05/15 19:23

_id 5af8
authors Rosenfeld, Y.
year 1995
title Automation of existing cranes: from concept to prototype
source Automation in Construction 4 (2) (1995) pp. 125-138
summary This paper describes the conversion of an existing full-scale 5-ton payload crane into a semi-automatic "Handling Robot". By its size, degrees of freedom, and mode of operation this crane resembles typical construction cranes, which can be enhanced in the same manner. The new control system allows operation of the crane in either a manual or a semi-automatic mode, and it can be taught to memorize up to 50 different benchmarks, i.e. particular points at the construction site, as well as safe routes among them. The major components of the system include: a programmable controller, three speed regulators, three encoders, several limit switches, a wireless remote control set, and a user-friendly MMI (Man-Machine-Interface). Most of the components can be installed externally in the vicinity of the crane's joints and inside the cabin, with minimal intervention in the original wiring. Following the physical retrofitting of the crane, a series of tests examined performance, accuracy, repeatability, and safety aspects. They demonstrated a 15-50% shortening of typical work cycles, high accuracy and repeatability, and a generally safer operation due to pre-tested paths and smoother movements with less sway and swing of the load.
keywords Construction Automation; Construction Cranes; Robotics; Machine Control
series journal paper
last changed 2003/05/15 12:35

No more hits.

HOMELOGIN (you are user _anon_982023 from group guest) CUMINCAD Papers Powered by SciX Open Publishing Services 1.002