Comparative Studies in Traction Concepts

2011 ◽  
Author(s):  
James L. Mathieson ◽  
Matthew Thompson ◽  
Heather Satterfield ◽  
Zachary Satterfield ◽  
Elisabeth Kraus ◽  
...  
Keyword(s):  
Experimental Evaluation ◽  
Soft Soil ◽  
Cost Effective ◽  
Cellular Materials ◽  
Analytical Models ◽  
Clemson University ◽  
Complex Process ◽  
Geometric Concepts ◽  
Effective Development ◽  
Traction Testing

The interaction between tires and soft soils is a complex process that has not yet been fully understood. Attempts to create analytical models which realistically simulate these interactions have proven to be exceedingly time consuming for each tire model and have achieved only limited success. Thus, the exploration and evaluation of traction concepts by analytical means is impractical. This paper posits that significantly more reliable, rapid, and cost effective development is achieved through the prototyping and experimental evaluation of traction concepts. Here, three traction prototypes are developed and evaluated by undergraduate teams in the course of an academic semester. These concepts explore the performance of grousers, inverted geometry (dimples), and cellular materials respectively using a wheel endurance and soft-soil traction testing system at Clemson University. Each concept is tested at different acceleration rates from 0–10km/h and at different loads while measuring the slip between the tire and soil surfaces. The results of experimental evaluation indicate that cellular materials present a unique slip profile which is superior to that of the two other purely geometric concepts studied. The worst performance was seen on the inverse geometry concept which presented a behavior of steadily increasing slip with respect to wheel velocity regardless of acceleration. Grousers also presented this behavior but only at higher accelerations. This suggests that not only that prototyping is preferable, but that traditional soft-soil traction approaches may be in error.

Real-time modeling of retractable self-launching glider using spreadsheets

2017 ◽  
Vol 89 (6) ◽  
pp. 791-796
Author(s):  
Yasser A. Nogoud ◽  
Attie Jonker ◽  
Shuhaimi Mansor ◽  
A.A.A. Abuelnuor
Keyword(s):  
Control System ◽  
High Performance ◽  
Cost Effective ◽  
Visual Presentation ◽  
Content Type ◽  
Spreadsheet Model ◽  
Time Modeling ◽  
Model Complex ◽  
Effective Development ◽  
And Control

Purpose This paper aims to propose a spreadsheet method for modeling and simulation of a retraction system mechanism for the retractable self-launching system for a high-performance glider. Design/methodology/approach More precisely, the method is based on parametric link design using Excel spreadsheets. Findings This method can be used for kinematic and dynamic analysis, graphical plotting and allows simulation of control kinematics with the ability to make quick and easy parametric changes to a design. It also has the ability to calculate the loads imposed on each component in the control system as a function of input loads and position. Practical implications This paper shows that it is possible to model complex control systems quickly and easily using spreadsheet programs already owned by most small companies. The spreadsheet model is a parametric model, and it gives a simple visual presentation of the control system with interactive movement and control by the user. Originality/value This spreadsheet model in conjunction with a simple CAD program enables the rapid and cost-effective development of control system components.

scholarly journals Green Management System

Media Wisata ◽  
2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ali Hasan
Keyword(s):  
Natural Resources ◽  
Environmental Protection ◽  
Environmental Sustainability ◽  
Management System ◽  
Cost Effective ◽  
Green Management ◽  
Modern Business ◽  
To Come ◽  
Effective Development ◽  
Management Functions

Green Management System (GMS) is an effort to protect the environment. With the depletion of natural resources, the protection of the environment is not only limited to a small part of its corporate social responsibility, but it must be a model in business organizations. Model GMS-oriented environment, will systematically affect the company in reducing waste, reducing the use of natural resources, reduce pollution and continuously monitoring the purpose of creating business results that were positive for all stakeholders. Modern business travel will continue to come under pressure from the environment and the realization of the company's sustainability strategy, the managers began to review the possibility of implementation of GMS in the management system of the organization; directs the management of the organization, developing technologies to reduce adverse environmental impact and develop the production of green (green production) more rational and cost-effective. Development and implementation of green policies in environmental management become an important part of the transformation of business management functions in optimizing the use of GMS to improve corporate performance and benefits for environmental sustainability. Direct implications for the development and implementation of environmental protection in the modern business organization in accordance with modern green standards and the principles of environmental sustainability and a company associated with the creation of the organization, program and structure, education and training of human resources will enable the transfer and dissemination of knowledge for environmental protection

Effect of Mixing Quality on NOx Emissions in Reheat Combustion of GT24 and GT26 Engines

2011 ◽  
Author(s):  
K. Michael Du¨sing ◽  
Andrea Ciani ◽  
Adnan Eroglu
Keyword(s):  
High Pressure ◽  
Development Process ◽  
Flow Characteristic ◽  
Water Channel ◽  
Cost Effective ◽  
Nox Emissions ◽  
Combustion System ◽  
Low Pressure Turbine ◽  
Effective Development ◽  
System 1

Alstoms GT24 and GT26 engines feature a unique sequential combustion system [1, 2]. This system consists of a premixed combustor (called EV), which is followed by a high pressure turbine, a reheat combustor (called SEV) and a low pressure turbine (Figure 1). Recently improvements in NOx performance of the SEV have been demonstrated. Starting with relatively simple methods numerous design variants have been tested and down selected. Further down-selection has been done with methods of increased complexity. Overall a fast and cost effective development process has been assured. During the development process the variation coefficient and unmixedness measured and calculated for mixing only systems (CFD and water channel) has proven to be a reliable indicators for low NOx emissions for the real combustion system on atmospheric and high pressure test rigs. To demonstrate this a comparison of both quantities against NOx emissions is shown. The paper focuses on the NOx results achieved during this development and its relation to mixing quantities. Using this relation, together with a detailed understanding of the flow characteristic in the SEV burner, reductions in NOx emissions for GT24 and GT26 SEV burner and lance hardware can be reached using relatively simple methods.

scholarly journals Compaction and Plasticity Comparative Behaviour of Soft Clay Treated with Coarse and Fine Sizes of Ceramic Tiles

2018 ◽  
Vol 34 ◽  
pp. 01012 ◽  
Author(s):  
Mohammed Ali Mohammed Al-Bared ◽  
Aminaton Marto ◽  
Indra Sati Hamonangan Harahap ◽  
Fauziah Kasim
Keyword(s):  
Soil Stabilization ◽  
Soft Soil ◽  
Soft Clay ◽  
Cost Effective ◽  
Dry Weight ◽  
Dry Density ◽  
Ceramic Tiles ◽  
Marine Clay ◽  
Maximum Dry Density ◽  
Stiff Soil

Recycled blended ceramic tiles (RBT) is a waste material produced from ceramic tile factories and construction activities. RBT is found to be cost effective, sustainable, environmental-friendly and has the potential to be used as an additive in soft soil stabilization. Recent reports show that massive amounts of RBT are dumped into legal or illegal landfills every year consuming very large spaces and creating major environmental problems. On the other hand, dredged marine clay obtained from Nusajaya, Johor, Malaysia has weak physical and engineering characteristics to be considered as unsuitable soft soil that is usually excavated, dumped into landfills and replaced by stiff soil. Hence, this study investigates the suitability of possible uses of RBT to treat marine clay. Laboratory tests included Standard proctor tests and Atterberg limits tests. The plasticity of marine clay was evaluated by adding 10%, 20%, 30% and 40% of 0.3 mm RBT. In addition, the compaction behaviour of treated marine clay was compared by adding two different sizes (0.3 mm and 1.18 mm diameter) of RBT. For both coarse and fine sizes of RBT, 10%, 20%, 30% and 40% of the dry weight of the soft clay were added. The mixture of each combination was examined in order to evaluate the Maximum Dry Density (MDD) and the optimum moisture content (OMC) for the treated soft clay. MDD and OMC for soft untreated samples were 1.59 Mg/m3 and 22%, respectively. Treated samples with 10%, 20%, 30% and 40% of 0.30 mm size RBT resulted in a significant reduction of OMC ranged from 19 to 15% while MDD resulted in increment ranged from 1.69 to 1.77 Mg/m3. In addition, samples treated with 10%, 20%, 30% and 40% of 1.18 mm size RBT resulted in major reduction of OMC ranged from 15 to 13.5% while MDD increased effectively from 1.75 to 1.82 Mg/m3. For all mix designs of soft clay-RBT, MDD was gradually increasing and OMC was sharply reducing with further increments of both sizes of RBT.

scholarly journals Web-Site-Based Tailored Advice to Promote Strength and Balance Training: An Experimental Evaluation

2009 ◽  
Vol 17 (2) ◽  
pp. 210-222 ◽  
Author(s):  
Samuel R. Nyman ◽  
Lucy Yardley
Keyword(s):  
Older People ◽  
Experimental Evaluation ◽  
Web Site ◽  
Action Plan ◽  
Meta Analysis ◽  
Balance Training ◽  
Cost Effective ◽  
Effect Sizes ◽  
Balance Problems ◽  
Tailored Advice

This study evaluated a Web site providing tailored advice to encourage older people to undertake strength and balance training (SBT). Adults age 60–88 (N = 302) were randomized to read either generic advice or advice tailored to their self-perceived balance problems and activity preferences. Between-groups differences in attitudes toward SBT after reading the advice did not quite reach significance (p = .059), but the tailored group reported higher ratings than the generic group that the advice was personally relevant (p = .017) and that the activities would be good for them (p = .047). Within-groups differences in the tailored group showed that completing an action plan increased confidence in undertaking SBT (p = .006). These findings were supported by a meta-analysis that pooled the effect sizes with those of a previous study. Thus, a tailored Web site might be a cost-effective way of encouraging some older people to undertake SBT.

scholarly journals Exploiting Semantic Annotations andQ-Learning for Constructing an Efficient Hierarchy/Graph Texts Organization

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Asmaa M. El-Said ◽  
Ali I. Eldesoky ◽  
Hesham A. Arafat
Keyword(s):  
Text Mining ◽  
Key Words ◽  
Experimental Evaluation ◽  
Semantic Annotation ◽  
Text Documents ◽  
Frequency Distributions ◽  
Semantic Annotations ◽  
Representation Scheme ◽  
Effective Development

Tremendous growth in the number of textual documents has produced daily requirements for effective development to explore, analyze, and discover knowledge from these textual documents. Conventional text mining and managing systems mainly use the presence or absence of key words to discover and analyze useful information from textual documents. However, simple word counts and frequency distributions of term appearances do not capture the meaning behind the words, which results in limiting the ability to mine the texts. This paper proposes an efficient methodology for constructing hierarchy/graph-based texts organization and representation scheme based on semantic annotation andQ-learning. This methodology is based on semantic notions to represent the text in documents, to infer unknown dependencies and relationships among concepts in a text, to measure the relatedness between text documents, and to apply mining processes using the representation and the relatedness measure. The representation scheme reflects the existing relationships among concepts and facilitates accurate relatedness measurements that result in a better mining performance. An extensive experimental evaluation is conducted on real datasets from various domains, indicating the importance of the proposed approach.

The Experimental Research on the Bag-Grouting-Pile Composite Foundation in Coastal Soft Foundation Treatment

2013 ◽  
Vol 275-277 ◽  
pp. 1411-1414
Author(s):  
Dong Wang ◽  
Jia Cao
Keyword(s):  
Experimental Research ◽  
Soft Soil ◽  
Cost Effective ◽  
Horizontal Displacement ◽  
Composite Foundation ◽  
Soil Reinforcement ◽  
Treatment Technology ◽  
Ground Treatment ◽  
Foundation Treatment ◽  
Soft Foundation

As a new ground treatment technology, the bag-grouting-pile composite foundation is used in railway soft soil reinforcement. In this paper, the application effect of bag-grouting-pile in coastal soft foundation treatment was studied in this experimental research; the deep settlement and the deep horizontal displacement of embankment edge in bag-grouting-pile composite foundation are tested in the research. The results of research show that the bag-grouting-pile composite foundation is a cost-effective ground treatment technology using in coastal soft foundation treatment.

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