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Davies, P.
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Prediction of Static Settling Point in a Seat Occupant System

Purdue Univ.-R. K. Ippili, P. Davies, A. K. Bajaj
  • Technical Paper
  • 2002-07-0051
Published 2002-06-18 by Verlag Des Verein Deutscher Ingenieure GmbH in Germany
The H-point location of a car seat occupant is strongly governed by the quasi-static behavior of polyurethane foam. Foam is a complex material with nonlinear stiffness and viscoelastic properties (creep). Foam properties are affected by compression level, excitation amplitude, temperature and humidity. Models of foam behavior are incorporated into a 2D model of a seat-occupant system. This multi-degree-of-freedom planar model predicts x, z and ϑ motions of a seat-occupant system consisting of interconnected masses, nonlinear springs and dampers. A graphical user interface is developed to visualize the settling of the occupant in the seat. A detailed study of the effects of changing foam stiffness and friction at occupant seat interface is included. The models described can also be used to predict the dynamic response of seat-occupant systems if the parameters characterizing the foam are adjusted appropriately.
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The Design and Evaluation of Microphone Arrays for the Visualization of Noise Sources on Moving Vehicles

Purdue University-H. Kook, P. Davies, J. S. Bolton
Published 1999-05-17 by SAE International in United States
The present work was directed towards the design of a sideline microphone array specifically adapted to the visualization of automotive noise sources in the 500 Hz to 2000 Hz range. The particular design philosophy followed here involved the minimization of the array redundancy: i.e., the minimization of the number of pairs of microphones that are separated by the same distance in the same directions. The performance of sixty-four element microphone arrays designed according to this principle will be illustrated through the use of simulated motor vehicle passbys. In addition, their performance will be compared with more conventional array designs: e.g., elliptical, and spiral arrays.
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An Efficient Procedure for Visualizing the Sound Field Radiated by Vehicles During Standardized Passby Tests

Purdue University-H. Kook, G. B. Moebs, P. Davies, J. S. Bolton
Published 1999-05-17 by SAE International in United States
Spherical beamforming was used to visualize sound radiation during a vehicle passby test. Forward and backward propagation procedures are compared in terms of computational expense. A spherical spreading correction factor is described, along with a maximum liklihood procedure for obtaining an optimal array weighting dependent on the relative distance between the microphones and the focus point. The de-Dopplerized microphone outputs are multiplied by the weighting factors and summed to yield the source strengths over a reconstruction plane “attached” to the vehicle. Results obtained using a 16 element sparse array during an actual passby are used to demonstrate the present approach.
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Fundamental Biology Research During the NASA/Mir Science Program

Institute of Medico-Biological Problems-V. Sytchev
Lockheed Engineering and Sciences Co.-P. Davies, D. Pletcher, R. Briggs, R. Schaefer
Published 1995-07-01 by SAE International in United States
A multi-discipline, multi-year collaborative spaceflight research program (NASA/Mir Science Program) has been established between the United States and Russia utilizing the capabilities of the Russian Mir Space Station and the NASA space shuttle fleet. As a key research discipline to be carried out onboard Mir, fundamental biology research encompasses three basic objectives: first, to investigate long-term effects of microgravity upon plant and avian physiology and developmental biology; second, to investigate the long-term effects of microgravity upon circadian rhythm patterns of biological systems; and third, to characterize the long-term radiation environment (internal and external) of the Russian Mir space station.The first joint U.S./Russian fundamental biology research on-board Mir is scheduled to begin in March, 1995 with the Mir mission 18 and conclude with the docking of the U.S. shuttle to Mir in June, 1995 during the STS-71, Spacelab/Mir Mission-1 (SLM-1). The two collaborative experiments originally included on the Mir-18 mission, lncubator-2 and Greenhouse-2, have added a new dimension to the technical and scientific cooperation between the two countries. In addition, the extended, 90-day (and greater for…
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Government appraisal of large civil aerospace projects~A personal perspective

Consultant-M. Hodson
DTI-M. Ralph, P. Davies
  • Technical Paper
  • 1994-11-0059
Published 1994-06-16 by Royal Aeronautical Society in United Kingdom
I hope this paper has given you some insight into the historical origins of the civil aeronautics assessment process in Government. I also hope you have learned something of how we go about he task today.Perhaps many years ago our role was one of the regulator guarding the taxpayer from the excessive optimism of marketing departments and enthusiasts. Time has moved on, and whilst of course we still must perform that original function, if I were to leave you with one thought I hope it might be that with industry we are building a better understanding of the market and hopefully to the benefit of the U.K. I began this talk dwelling on the poor state of affairs at the time of the Plowden Royal Commission, and if I may I would like to leave you with a final chart courtesy of the SBAC. This shows that the U.K.'s civil performance improved dramatically in the 1980s with turnover in real terms up by around 125% and share of world output also strongly up. To cap…

Pan-European Travel Information Exchange: The Interchange Project

Automobile Association-D. Marsh
Castle Rock Consultants-P. Davies
  • Technical Paper
  • 1993-25-0138
Published 1993-09-01 by ISATA - Dusseldorf Trade Fair in United Kingdom
INTERCHANGE is a DRIVE II project which aims to establish a pilot network for the exchange of traffic and travel information between European countries, based on commonly agreed specifications and standards. The first priority for the INTERCHANGE pilot network is to exchange traffic event information between participating national traffic information centers. Other types of information may be added later, when further countries are added to the system.Traffic and travel information services have already proved their value to citizens of many countries within Europe. Traffic information exchange is also regarded as essential for the efficient and the safe management of transport systems by the appropriate authorities. With continuing growth in travel between member states, due to increased business contacts, commerce, and social cohesion (associated in part with the completion of the Single European Market), the need for international travel information exchange continues to expand.Achievement of an efficient and cost-effective European Traveler Information Network requires internationally accepted standards for information definition, selection, coding and transmission. INTERCHANGE seeks to establish a permanent information exchange network and evaluate its…

IVHS in America~The Road Ahead

Castle Rock Consultants-C. Hill, P. Davies
  • Technical Paper
  • 1991-25-0001
Published 1991-05-20 by ISATA - Dusseldorf Trade Fair in United Kingdom
Unprecedented cooperation between public and private sectors lies at the heart of the new ""smart vehicle-smart highway'' developments around the world. ""Smart vehicles'' and ""smart highways'' form the key elements of intelligent vehicle-highway systems (IVHS), which promise to introduce dramatic changes to road transportation by the end of the current decade. Automobile companies, electronics firms and highway agencies are coming together in a race to set the standard for the highways of the twenty-first century.This paper reviews current IVHS initiatives in North America. It outlines the main IVHS technologies and looks at some of the major programs which lie behind current developments. These are examined at three levels of involvement, covering overall coordination, interagency cooperation, and independent state-level IVHS activities.

Dynamic Route Information: Beacons or Radio

Castle Rock Consultants-P. Davies, G. Klein
  • Technical Paper
  • 1991-25-0074
Published 1991-05-20 by ISATA - Dusseldorf Trade Fair in United Kingdom
Two technologies which are emerging to lead the field in driver information systems are the Radio Data System Traffic Message Channel (RDS-TMC) and the infrared beacon-based route guidance system ALI-SCOUT. While both systems offer attractions over current technologies such as ARI, these approaches are not truly integrated at this time.RDS-TMC primarily provides traffic information to drivers concerning events such as accidents, severe weather or congestion. ALI-SCOUT provides routing advice, but no background information on the traffic conditions which determine the best routes. The systems also differ in that ALI-SCOUT is only supported in areas equipped with beacons, while RDS-TMC can potentially cover wide areas; and in that ALI-SCOUT provides feedback on actual travel speeds, while RDS-TMC relies on external data sources.This presentation builds upon current work carried out within the European Communities' DRIVE RDS-ALERT project, which aims toward the standardization of RDS-TMC throughout Europe. It includes some results of recent work carried out for the Rijkswaterstaat, on Dynamic Route Guidance Systems. It also outlines further work now required covering systems integration and field trials in…

Standards for Traffic Messages Using Rds-Alert

Castle Rock Consultants-P. Davies, G. A. Klein, N. W. Balding
  • Technical Paper
  • 894372
Published 1989-01-01 by Institution of Mechanical Engineers in United Kingdom
The Radio Data System (RDS) consists of a silent data channel already being broadcast by most VHF-FM radio stations in the UK. One of the additional features currently being developed for RDS is the Traffic Message Channel (TMC). This will provide motorists with a constant stream of traffic information, either displayed on an in- vehicle receiver or by speech synthesis. Significant work has already been carried out on messages to be broadcast, location codes and message management issues for RDS-TMC, which is reported in this paper. Through the European Drive Road Transport Informatics project called RDS-ALERT (Advice and Problem Location for European Road Traffic), this work is now continuing toward standards for RDS-TMC throughout Europe.
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Nitrogen Oxide Removal Catalysts for Purification of Automobile Exhaust Gases

Imperial Chemical Industries Ltd. (England)-D.R. Ashmead, J.S. Campbell, P. Davies, K. Farmery
Published 1974-02-01 by SAE International in United States
The chemistry involved in the selective catalytic reduction of oxides of nitrogen (NOx) to nitrogen is outlined and the requirements of a practical NOx reduction catalyst are summarized. The effects of temperature, gas composition, NOx concentration, and sulfur dioxide on the activity of some potential NOx catalysts have been studied. Steady-state engine dynamometer endurance runs with ruthenium and non-ruthenium catalysts are described, and some vehicle durability data with particulate and monolithic base metal containing NOx catalysts are also presented.
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