Balloon Locomotion for Extreme Terrain

2020 ◽  
pp. 1-15
Author(s):  
Hari D. Nayar ◽  
Michael T. Pauken ◽  
Morgan L. Cable ◽  
Michael A. Hans ◽  
Manit Ginoya
Keyword(s):  
Environmental Conditions ◽  
Component Technology ◽  
New Approach ◽  
Rugged Terrain ◽  
Surface Mobility ◽  
Planetary Bodies ◽  
Concept Vehicle

Abstract BALLET (BALloon Locomotion for Extreme Terrain) is a new concept vehicle for robotic surface mobility on planetary bodies with atmospheres. The vehicle is composed of a buoyant balloon with 6 evenly-distributed suspended payload modules each serving as a foot for locomotion over inaccessible rugged terrain. While the physics of BALLET will apply on Venus and Mars, the environmental conditions and available component technology limit our consideration to Titan. We describe the concept in detail, its applications for science missions on Titan, mission deployment scenarios, analyses of the concept under varying environmental conditions and simulations of its locomotion. The concept is shown to be feasible and provides a new approach for exploration of rugged lakes, dunes, shorelines and cryovolcanic regions on Titan.

Development of System for High Quality Wood Grain Design

2011 ◽  
Author(s):  
Takuya Mori ◽  
Satoshi Shibasaki ◽  
Hideki Aoyama
Keyword(s):  
Computer Graphics ◽  
Tree Growth ◽  
Wood Surface ◽  
Environmental Conditions ◽  
Tree Species ◽  
Growth Conditions ◽  
High Quality ◽  
New Approach ◽  
Conventional Methods ◽  
Wood Grain

Various approaches for generating woodgrain patterns using computer graphics have been proposed so far. However, it is difficult to reproduce real woodgrain patterns using such conventional methods. In this paper, a new approach for generating woodgrain patterns is proposed. Virtual trees are generated by simulating tree growth in consideration of environmental conditions. Moreover, fine tree tissues and reflection properties at the wood surface are modeled. By applying these modeled factors, more diverse and accurate woodgrain patterns can be generated. With this approach, various types of virtual trees can be obtained by changing growth conditions such as period and location of growth or form of tissue in trees without the need to reset complicated parameters of each tree species. After this, the virtual trees can be cut at arbitrary areas, thus allowing a variety of woodgrain patterns to be generated by easy parameter setup.

An Approach for 3D Visualization of Discrete Event Simulation

2004 ◽  
Author(s):  
Yongmin Zhong ◽  
Bijan Shirinzadeh
Keyword(s):  
Discrete Event Simulation ◽  
3D Visualization ◽  
Rapid Development ◽  
Discrete Event ◽  
Component Technology ◽  
3D Animation ◽  
New Approach ◽  
Discrete Simulation ◽  
Event Simulation ◽  
Simulation Results

This paper presents a new approach to create 3D visualization from discrete simulation results. This approach connects discrete event simulation directly to 3D animation with its novel methods of analyzing and converting discrete simulation results into animation events to trigger 3D animation. In addition, it constructs a 3D animation framework for the visualization of discrete simulation results. This framework supports the reuse of both the existing 3D animation objects and behavior components, and allows the rapid development of new 3D animation objects by users with no special knowledge in computer graphics but average computer skills. This approach has been implemented with the software component technology, and successfully applied in industry. Results from its practice in an electronics assembly factory are also provided in the paper to demonstrate the performance of this new approach.

scholarly journals Faunal breaks and species composition of Indo-Pacific corals: the role of plate tectonics, environment and habitat distribution

2013 ◽  
Vol 280 (1763) ◽  
pp. 20130818 ◽  
Author(s):  
S. A. Keith ◽  
A. H. Baird ◽  
T. P. Hughes ◽  
J. S. Madin ◽  
S. R. Connolly
Keyword(s):  
Environmental Conditions ◽  
Plate Tectonics ◽  
Depth Range ◽  
New Approach ◽  
Tectonic Plates ◽  
Geological Features ◽  
Historical Processes ◽  
Colonization Ability ◽  
Multiple Species

Species richness gradients are ubiquitous in nature, but the mechanisms that generate and maintain these patterns at macroecological scales remain unresolved. We use a new approach that focuses on overlapping geographical ranges of species to reveal that Indo-Pacific corals are assembled within 11 distinct faunal provinces. Province limits are characterized by co-occurrence of multiple species range boundaries. Unexpectedly, these faunal breaks are poorly predicted by contemporary environmental conditions and the present-day distribution of habitat. Instead, faunal breaks show striking concordance with geological features (tectonic plates and mantle plume tracks). The depth range over which a species occurs, its larval development rate and genus age are important determinants of the likelihood that species will straddle faunal breaks. Our findings indicate that historical processes, habitat heterogeneity and species colonization ability account for more of the present-day biogeographical patterns of corals than explanations based on the contemporary distribution of reefs or environmental conditions.

scholarly journals Mg/Ca ratios measured by laser induced breakdown spectroscopy (LIBS): a new approach to decipher environmental conditions

2015 ◽  
Vol 30 (9) ◽  
pp. 1913-1919 ◽  
Author(s):  
A. García-Escárzaga ◽  
S. Moncayo ◽  
I. Gutiérrez-Zugasti ◽  
M. R. González-Morales ◽  
J. Martín-Chivelet ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Laser Induced Breakdown Spectroscopy ◽  
New Approach ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Mollusc Species ◽  
First Time ◽  
Environmental Proxy

Mg/Ca ratios in shells of the mollusc species Phorcus lineatus obtained using the LIBS technique has been evaluated as an environmental proxy to reconstruct paleotemperatures and season of capture of molluscs for the first time.

Fluctuations of a Fortnightly Abundance Index of the Ivoirian Coastal Pelagic Species and Associated Environmental Conditions

1987 ◽  
Vol 44 (2) ◽  
pp. 408-421 ◽  
Author(s):  
Roy Mendelssohn ◽  
Philippe Cury
Keyword(s):  
Time Series ◽  
Environmental Conditions ◽  
Ivory Coast ◽  
Missing Values ◽  
Multivariate Time Series ◽  
Sea Surface ◽  
New Approach ◽  
Pelagic Species ◽  
Biological Interpretation ◽  
Analyze Time Series

In this paper we analyze time series of catch per unit of effort (CPUE) from 1966 to 1982 of small pelagic species off the Ivory Coast using sea surface temperature (SST) collected by merchant ships. A fill-in model is used to estimate missing values of CPUE and SST in the areas in which the fishery operates. A multivariate time series model of the fortnightly data is able to explain 43% of the observed variance in CPUE from 1966 to 1982. A model estimated by using only the data from 1966 to 1980 produced reasonable forecasts of the fortnightly CPUE for 1981–82. A new approach for estimating optimal transformations of variables in the model is used to examine the form of the relationships between CPUE and its predictors. The biological interpretation of the estimated transformations is consistent with previous results on the dynamics of zooplankton in the same area.

A Nonlinear Steady-State Characteristic Performance Curve for Medium-Temperature Solar Energy Collectors

1991 ◽  
Vol 113 (3) ◽  
pp. 164-171 ◽  
Author(s):  
P. C. Eames ◽  
B. Norton
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Solar Energy ◽  
Environmental Conditions ◽  
Solar Collector ◽  
Performance Curve ◽  
State Characteristic ◽  
Medium Temperature ◽  
New Approach ◽  
Made In

A numerical simulation model was employed to investigate the effects of ambient temperature and insolation of the efficiency of compound parabolic concentrating solar energy collectors. The limitations of presently used collector performance characterization curves were investigated and a new approach proposed. The major advantage of the new procedure over those employed previously is that different solar collector performance characteristics can now be readily normalized to a common set of environmental conditions. Thus, an equitable comparison may be made, in the context of the application conditions, of rating characteristics for disparate collectors which were obtained initially under different conditions.

scholarly journals From laboratory to environmental conditions: a new approach for chemical’s biodegradability assessment

2016 ◽  
Vol 23 (18) ◽  
pp. 18684-18693 ◽  
Author(s):  
Brillet François ◽  
Maul Armand ◽  
Durand Marie-José ◽  
Gérald Thouand
Keyword(s):  
Environmental Conditions ◽  
New Approach ◽  
Biodegradability Assessment

A New Approach to the Design of Mono-Hull FPSOs

2005 ◽  
Author(s):  
Tek Khaw ◽  
Phil Rawstron ◽  
Kaj Lagstrom
Keyword(s):  
Environmental Conditions ◽  
Rational Approach ◽  
Preliminary Design ◽  
Financial Loss ◽  
New Approach ◽  
Ship Building ◽  
Mass Properties ◽  
Current Design ◽  
Motion Performance ◽  
Fabrication Costs

Problems and issues arising in the design and operation of mono-hull FPSOs have been apparent for many years. This has resulted in shortcomings of current design philosophy being highlighted. Environmental downtime of 10 to 14 days per year is not uncommon in both new-built and converted FPSOs. The financial loss resulting from this downtime during the life of a field, is a significant factor in the overall field economics. The importance of selecting the principal dimensions of the hull to optimise the natural periods of the FPSO is discussed in this paper. Converted FPSOs are therefore at a disadvantage as the natural periods are already set by the principal dimensions and mass properties, which may not suit the environmental conditions at site, potentially resulting in high downtime. However, it is also noted that preliminary design of new built-FPSOs has also tended to neglect this aspect of design and opportunities to optimise motion performance have often been lost by following standard ship building practices in selecting initial principal hull dimensions. This paper explores a new rational approach to the design of the FPSOs, relative to the field environmental conditions, particularly for deep water locations. The main objective is to achieve minimum downtime to avoid financial penalties caused by the associated loss of production. Preliminary hull sizing software for optimising the hull principal dimensions, relative to the mooring and riser requirements and the field environmental conditions for a given storage capacity and topside load is presented. Benefits for the riser and mooring systems and for hull material and fabrication costs are also outlined.

Sign in / Sign up

Export Citation Format

Share Document