GeoSail: an elegant solar sail demonstration mission (2007)
Macdonald, M., Hughes, G.W., McInnes, C.R.*, Lyngvi, A., Falkner, P., Atzei, A.
In this paper a solar sail magnetotail mission concept was examined. The 43-m square solar sail is used to provide the required propulsion for continuous sun-synchronous apse-line precession. The...
Impact of optical degredation on solar sail mission performance (2007)
Dachwald, B., Macdonald, M., McInnes, C.R.*
The optical properties of the thin metalized polymer films that are projected for solar sails are likely to be affected by the damaging effects of the space environment, but their real degradation...
Developments in the design of cold-formed steel members and structures (2007)
Rhodes, J.*, Macdonald, M., Heiyantuduwa, M.A.
Review of the latest design procedures for structural members including design information for connections and systems, contemporary design criteria around the world and the latest computer-aided...
Heliocentric solar sail orbit transfers with locally optimal control laws (2007)
Macdonald, M., McInnes, C.R.*, Dachwald, B.
Solar sailing is increasingly being considered by space agencies for future science missions. With the absence of reaction mass from the primary propulsion system arises the potential for new...
GeoSail: an elegant solar sail demonstration mission (2007)
Macdonald, M., Hughes, G.W., McInnes, C.R., Lyngvi, A., Falkner, P., Atzei, A.
In this paper a solar sail magnetotail mission concept was examined. The 43-m square solar sail is used to provide the required propulsion for continuous sun-synchronous apse-line precession. The...
Impact of optical degredation on solar sail mission performance (2007)
Dachwald, B., Macdonald, M., McInnes, C.R.
The optical properties of the thin metalized polymer films that are projected for solar sails are likely to be affected by the damaging effects of the space environment, but their real degradation...
Developments in the design of cold-formed steel members and structures (2007)
Rhodes, J., Macdonald, M., Heiyantuduwa, M.A.
Review of the latest design procedures for structural members including design information for connections and systems, contemporary design criteria around the world and the latest computer-aided...
Heliocentric solar sail orbit transfers with locally optimal control laws (2007)
Macdonald, M., McInnes, C.R., Dachwald, B.
Solar sailing is increasingly being considered by space agencies for future science missions. With the absence of reaction mass from the primary propulsion system arises the potential for new...
Terrestrial planet sample return missions using solar sail propulsion (2006)
Hughes, G.W., Macdonald, M., McInnes, C.R.
An assessment of terrestrial planet sample return missions utilising solar sail propulsion is presented, in addition to sample return from a high inclination near-Earth asteroid, 2001 QP153. Payloads...
High energy small body missions using solar sail propulsion (2006)
McInnes, C.R.*, Hughes, G.W., Macdonald, M.
A range of mission concepts will be discussed which explore the use of solar sail propulsion for high-energy small body missions. It will be shown that a modest sized solar sail can enable high...
Solar polar orbiter: a solar sail technology reference study (2006)
Macdonald, M., Hughes, G.W., McInnes, C.R.*, Lyngvi, A., Falkner, P., Atzei, A.
An assessment is presented of a Solar Polar Orbiter mission as a Technology Reference Study. The goal is to focus the development of strategically important technologies of potential relevance to...
Investigation of web crippling behaviour using nonlinear finite element analysis (2006)
Heiyantuduwa, M.A., Macdonald, M., Rhodes, J.*
The yield line mechanism analysis on web crippling of cold-formed stainless steel square and rectangular hollow sections under two-flange loading is presented in this paper. A concentrated load was...
Behaviour of cold-formed stainless steel stub columns under bending and axial loading (2006)
Macdonald, M., Rhodes, J.*, Kotelko, M.
This paper is concerned with the ultimate load capacity of non-perforated and perforated equal-angle cold-formed steel stub columns. An experimental study has been undertaken to investigate the...
A detailed examination of interactive buckling in plain channel sections (2006)
Aziz, A., Rhodes, J.*, Macdonald, M., Nash, D.H.
A finite element analysis that focused on elastic buckling of columns is presented. The key points of interest for the study were the affect of the wandering neutral axis and the assumed effective...
Finite element analysis of web crippling behaviour of cold-formed steel flexural members (2006)
Macdonald, M., Heiyantuduwa, M.A., Rhodes, J.*
The resistance of cold-formed thin-walled steel cassettes against local transverse forces, i.e. the web crippling capacity, was investigated both experimentally and numerically using finite element...
Sample return from Mercury and other terrestrial planets using solar sail propulsion (2006)
Hughes, G.W., Macdonald, M., McInnes, C.R.*, Lyngvi, A., Falkner, P., Atzei, A.
A conventional Mercury sample return mission requires significant launch mass due to the large AV required for the outbound and return trips and the large mass of a planetary lander and ascent...
Terrestrial planet sample return missions using solar sail propulsion (2006)
Hughes, G.W., Macdonald, M., McInnes, C.R.
An assessment of terrestrial planet sample return missions utilising solar sail propulsion is presented, in addition to sample return from a high inclination near-Earth asteroid, 2001 QP153. Payloads...
High energy small body missions using solar sail propulsion (2006)
McInnes, C.R., Hughes, G.W., Macdonald, M.
A range of mission concepts will be discussed which explore the use of solar sail propulsion for high-energy small body missions. It will be shown that a modest sized solar sail can enable high...
Solar polar orbiter: a solar sail technology reference study (2006)
Macdonald, M., Hughes, G.W., McInnes, C.R., Lyngvi, A., Falkner, P., Atzei, A.
An assessment is presented of a Solar Polar Orbiter mission as a Technology Reference Study. The goal is to focus the development of strategically important technologies of potential relevance to...
GeoSail: Exploring the megnetosphere using a low cost solar sail (2006)
Macdonald, M., McInnes, C.R., Alexander, D., Sandman, A.
GeoSail is a small, low cost, innovative mission designed to exploit the versatility of solar sail propulsion for the exploration of magnetic reconnection and electron dynamics in the Earth's...
Investigation of web crippling behaviour using nonlinear finite element analysis (2006)
Heiyantuduwa, M.A., Macdonald, M., Rhodes, J.
The yield line mechanism analysis on web crippling of cold-formed stainless steel square and rectangular hollow sections under two-flange loading is presented in this paper. A concentrated load was...
Behaviour of cold-formed stainless steel stub columns under bending and axial loading (2006)
Macdonald, M., Rhodes, J., Kotelko, M.
This paper is concerned with the ultimate load capacity of non-perforated and perforated equal-angle cold-formed steel stub columns. An experimental study has been undertaken to investigate the...
A detailed examination of interactive buckling in plain channel sections (2006)
Aziz, A., Rhodes, J., Macdonald, M., Nash, D.H.
A finite element analysis that focused on elastic buckling of columns is presented. The key points of interest for the study were the affect of the wandering neutral axis and the assumed effective...
Finite element analysis of web crippling behaviour of cold-formed steel flexural members (2006)
Macdonald, M., Heiyantuduwa, M.A., Rhodes, J.
The resistance of cold-formed thin-walled steel cassettes against local transverse forces, i.e. the web crippling capacity, was investigated both experimentally and numerically using finite element...
Sample return from Mercury and other terrestrial planets using solar sail propulsion (2006)
Hughes, G.W., Macdonald, M., McInnes, C.R., Lyngvi, A., Falkner, P., Atzei, A.
A conventional Mercury sample return mission requires significant launch mass due to the large AV required for the outbound and return trips and the large mass of a planetary lander and ascent...
Engineering vascularized skeletal muscle tissue (2005)
Levenberg, S., Rouwkema, J., Macdonald, M., Garfein, E.S., Kohane, D.S., Darland, D.C., ...
Defining the infrastructure for a national item bank service (2005)
Sclater, N., Boyle, E., Bull, J., Church, C., Craven, P., Cross, R., ...
Item banks (sometimes known as question banks) have been around for many years but are not yet widely used in the UK. There are clear benefits such as economies of scale when items are built across a...
Finite element modelling of cold formed stainless steel columns (2005)
This paper describes the results obtained from a finite element investigation into the load capacity of column members of lipped channel cross-section, cold formed from Type 304 stainless steel,...
Realistic Earth escape strategies for solar sailing (2005)
With growing interest in solar sailing comes the requirement to provide a basis for future detailed planetary escape mission analysis by drawing together prior work, clarifying and explaining...
Spacecraft planetary capture using gravity assist manoeuvres (2005)
If the arrival speed at a target body can be increased from the very low hyperbolic excesses required to perform a low-thrust capture maneuver, then potentially significant savings can be made in the...
Analytical control laws for planet-centred solar sailing (2005)
With increased interest in solar sailing from both ESA and NASA for future science missions comes the requirement to assess potential planet-centered orbits and generate algorithms for effective...
Potential effects of optical solar sail degredation on trajectory design (2005)
Dachwald, B., Baturkin, V., Coverstone, V.L., Diedrich, B., Garbe, G., Gorlich, M., ...
The optical properties of the thin metalized polymer films that are projected for solar sails are assumed to be affected by the erosive effects of the space environment. Their degradation behavior in...
Potential solar sail degradation effects on trajectory and altitude controls (2005)
Dachwald, B., Sebolt, W., Macdonald, M., McInnes, C.R., Rios-Reyes, L., Scheeres, D.J., ...
Paper on the potential for solar sail degradation effects on trajectory and altitude controls.
Defining the infrastructure for a national item bank service (2005)
Sclater, N., Boyle, E., Bull, J., Church, C., Craven, P., Cross, R., ...
Item banks (sometimes known as question banks) have been around for many years but are not yet widely used in the UK. There are clear benefits such as economies of scale when items are built across a...
Realistic Earth escape strategies for solar sailing (2005)
With growing interest in solar sailing comes the requirement to provide a basis for future detailed planetary escape mission analysis by drawing together prior work, clarifying and explaining...
Spacecraft planetary capture using gravity assist manoeuvres (2005)
If the arrival speed at a target body can be increased from the very low hyperbolic excesses required to perform a low-thrust capture maneuver, then potentially significant savings can be made in the...
Analytical control laws for planet-centred solar sailing (2005)
With increased interest in solar sailing from both ESA and NASA for future science missions comes the requirement to assess potential planet-centered orbits and generate algorithms for effective...
Potential effects of optical solar sail degredation on trajectory design (2005)
Dachwald, B., Baturkin, V., Coverstone, V.L., Diedrich, B., Garbe, G., Gorlich, M., ...
The optical properties of the thin metalized polymer films that are projected for solar sails are assumed to be affected by the erosive effects of the space environment. Their degradation behavior in...
Potential solar sail degradation effects on trajectory and altitude controls (2005)
Dachwald, B., Sebolt, W., Macdonald, M., McInnes, C.R., Rios-Reyes, L., Scheeres, D.J., ...
Paper on the potential for solar sail degradation effects on trajectory and altitude controls.
Material properties of cold formed stainless steel structural sections (2004)
This paper describes the results obtained from a series of tensile tests performed on standard type 304 stainless steel tensile test coupons and on cold formed type 304 stainless steel structural...
Failure loads of stainless steel stub columns subject to varying bending and axial loading (2004)
Examines the behaviour of cold-formed stainless steel stub columns where the material follows a Ramberg–Osgood stress–strain law. The stub column length is varied to examine the effects on the...
Finite element modelling of cold formed stainless steel columns (2004)
This paper describes the results obtained from a finite element investigation into the load capacity of column members of lipped channel cross-section, cold formed from Type 304 stainless steel,...
Comparative study into load-capacity of lipped channel columns under compression (2004)
Macdonald, M., Kotelko, M., Rhodes, J., Kolakowski, Z.
Presents a finite element analysis on the post-buckling behaviour of thin-walled cold-formed lipped channel and hat-section stub columns under axial compression.
Channel section beams subject to static and dynamic loading (2004)
The elasto-plastic behavior of plain channel section beams under central point loading is investigated under static and impact loading conditions. Two different loading set-ups are considered, the...
A near-term roadmap for solar sailing (2004)
Macdonald, M., McInnes, C.R., Hughes, G.W.
This paper presents end-to-end system analysis studies of three Earth-centred missions that are significantly enhanced or enabled by solar sail technology, GeoSail, Geostorm and Polar Observer. The...
Analysis of a solar sail mercury sample return mission (2004)
Hughes, G.W., Macdonald, M., McInnes, C.R., Atzei, A., Falkner, P.
Solar sailing can be used to reduce lander mass allocation by delivering the lander to a low, thermally safe orbit close to the terminator. In addition, the ascending node of the solar sail parking...
Stainless steel stub columns subject to combined bending and axial loading (2004)
Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes...
Material properties of cold formed stainless steel structural sections (2004)
This paper describes the results obtained from a series of tensile tests performed on standard type 304 stainless steel tensile test coupons and on cold formed type 304 stainless steel structural...
Failure loads of stainless steel stub columns subject to varying bending and axial loading (2004)
Examines the behaviour of cold-formed stainless steel stub columns where the material follows a Ramberg-Osgood stress-strain law. The stub column length is varied to examine the effects on the...
Finite element modelling of cold formed stainless steel columns (2004)
This paper describes the results obtained from a finite element investigation into the load capacity of column members of lipped channel cross-section, cold formed from Type 304 stainless steel,...
Comparative study into load-capacity of lipped channel columns under compression (2004)
Macdonald, M., Kotelko, M., Rhodes, J., Kolakowski, Z.
Presents a finite element analysis on the post-buckling behaviour of thin-walled cold-formed lipped channel and hat-section stub columns under axial compression.
Channel section beams subject to static and dynamic loading (2004)
The elasto-plastic behavior of plain channel section beams under central point loading is investigated under static and impact loading conditions. Two different loading set-ups are considered, the...
Stainless steel stub columns subject to combined bending and axial loading (2004)
Stainless steel exhibits highly non-linear behaviour, and in the case of short column structural members, this can lead to substantial conservatism in the prediction of load capacity by design codes...
A near-term roadmap for solar sailing (2004)
Macdonald, M., McInnes, C.R., Hughes, G.W.
This paper presents end-to-end system analysis studies of three Earth-centred missions that are significantly enhanced or enabled by solar sail technology, GeoSail, Geostorm and Polar Observer. The...
Analysis of a solar sail mercury sample return mission (2004)
Hughes, G.W., Macdonald, M., McInnes, C.R., Atzei, A., Falkner, P.
Solar sailing can be used to reduce lander mass allocation by delivering the lander to a low, thermally safe orbit close to the terminator. In addition, the ascending node of the solar sail parking...
Aim: To determine the factors influencing the distribution of birds in remnants in a fragmented agricultural landscape. Location Forty-seven eucalypt remnants and six sites in continuous forest in...
MacDonald, M., Kirkpatrick, J.B.
Aim:To determine the factors influencing the distribution of birds in remnants in a fragmented agricultural landscape. Location Forty-seven eucalypt remnants and six sites in continuous forest in the...
Low cost Mercury orbiter and Mercury sample return missions using solar sail propulsion (2003)
McInnes, C.R. *, Hughes, G.W., Macdonald, M.
The use of solar sail propulsion is investigated for both Mercury orbiter (MO) and Mercury sample return missions (MeSR). It will be demonstrated that solar sail propulsion can significantly reduce...
Low cost Mercury orbiter and Mercury sample return missions using solar sail propulsion (2003)
McInnes, C.R., Hughes, G.W., Macdonald, M.
The use of solar sail propulsion is investigated for both Mercury orbiter (MO) and Mercury sample return missions (MeSR). It will be demonstrated that solar sail propulsion can significantly reduce...
Load capacity of combined steel/aluminium members under bending action - experimental study (2003)
Macdonald, M., Rhodes, J., Kotelko, M.
A study of the bending action and load capacity of combined steel/aluminium members.
Load capacity of combined steel/aluminium members under bending action - experimental study (2003)
Macdonald, M., Rhodes, J., Kotelko, M.
A study of the bending action and load capacity of combined steel/aluminium members.
Aim: To determine the factors influencing the distribution of birds in remnants in a fragmented agricultural landscape. Location Forty-seven eucalypt remnants and six sites in continuous forest in...
Load capacity of eccentrically loaded stainless steel columns (2003)
Macdonald, M., Rhodes, J. *, Taylor, G.T.
Examines the load capacity of eccentrically loaded stainless steel columns.
Behaviour of stainless steel columns under combined bending and axial compression loading (2003)
Results of the loading of stainless steel columns with combined bending and axial compression.
Dolan, KA, Shearer, J, MacDonald, M, Mattick, RP, Hall, W, Wodak, AD.
Objectives: The aim was to determine whether methadone maintenance treatment reduced heroin use, syringe sharing and HIV or hepatitis C incidence among prisoners. Methods: All eligible prisoners...
Terrestrial planet sample return using solar sail propulsion (2003)
Hughes, G.W., Macdonald, M., McInnes, C.R.*, Atzei, A., Falkner, P.
An assessment of terrestrial planet sample return missions utilising solar sail propulsion is presented, in addition to sample return from a high inclination near-Earth asteroid, 2001 QP153. Payloads...
Load capacity of eccentrically loaded stainless steel columns (2003)
Macdonald, M., Rhodes, J., Taylor, G.T.
Examines the load capacity of eccentrically loaded stainless steel columns.
Behaviour of stainless steel columns under combined bending and axial compression loading (2003)
Results of the loading of stainless steel columns with combined bending and axial compression.
Finite element modelling of stainless steel columns in variation in mechanical properties (2002)
Finite element modelling of stainless steel columns
Finite element modelling of stainless steel columns in variation in mechanical properties (2002)
Finite element modelling of stainless steel columns
Computer technology in tunnel design (2002)
Thomas, A.H., Bennett, E.C., MacDonald, M., Clayton, C.R.I.
This article presents a discussion of the current status of the use of computers in the design of tunnels. Numerical models to describe and predict ground and tunneling conditions come in a variety...
Payload mass fraction optimization for solar cargo missions (2002)
McInnes, C.R., Hughes, G.W., Macdonald, M.
SOLAR sailing offers the potential to reduce the required initial mass in low Earth orbit for future piloted Mars missions.1¡3 Athough solar sailing does not appear to be suitable for crew...
Geosail: A novel solar sail mission concept for geospace (2002)
Alexander, D., McInnes, C.R., Angelopoulos, V., Sandeman, A.W., Macdonald, M.
The GeoSail mission employs a low-performance solar sail, attainable with the current state-of-the-art technologies, to carry out breakthrough scientific measurements in the Earth’s magnetotail. A...
Solar sail capture trajectories at Mercury (2002)
Mercury is an ideal environment for future planetary exploration by solar sail since it has proved difficult to reach with conventional propulsion and hence remains largely unexplored. In addition,...
Seasonal efficiencies of solar sailing in planetary orbit (2002)
Increasingly solar sailing is perceived as a practical means of spacecraft propulsion. This paper concentrates on further understanding the orbital dynamics of a solar sail in a planet-centred...
Payload mass fraction optimization for solar cargo missions (2002)
McInnes, C.R., Hughes, G.W., Macdonald, M.
SOLAR sailing offers the potential to reduce the required initial mass in low Earth orbit for future piloted Mars missions.1¡3 Athough solar sailing does not appear to be suitable for crew...
Geosail: A novel solar sail mission concept for geospace (2002)
Alexander, D., McInnes, C.R., Angelopoulos, V., Sandeman, A.W., Macdonald, M.
The GeoSail mission employs a low-performance solar sail, attainable with the current state-of-the-art technologies, to carry out breakthrough scientific measurements in the Earth's magnetotail. A...
Solar sail capture trajectories at Mercury (2002)
Mercury is an ideal environment for future planetary exploration by solar sail since it has proved difficult to reach with conventional propulsion and hence remains largely unexplored. In addition,...