Generalized Kinematic Modeling of Reconfigurable Machine Tools

1998 ◽  
Vol 124 (1) ◽  
pp. 47-51 ◽  
Author(s):  
Yong-Mo Moon ◽  
Sridhar Kota
Keyword(s):  
Machine Tools ◽  
Screw Theory ◽  
Cost Effective ◽  
Mathematical Representation ◽  
Kinematic Modeling ◽  
Effective Manner ◽  
Systematic Selection ◽  
Motion Characteristics ◽  
Set Up ◽  
Representation Scheme

To accommodate frequent changes in product design and to be able to process a family of products in a timely and cost-effective manner, the next generation of machine tools should be reconfigurable. Reconfigurability enables reduction not only in machine design lead time but more significantly a reduction in machine set-up and ramp-up time. The essential characteristics of Reconfigurable Machine Tools (RMTs) include modularity, convertibility, flexibility, and cost-effectiveness. This paper presents a mathematical representation scheme using screw theory that lays the foundation for systematic design of reconfigurable machine tools. The motion characteristics of a set of desired machining tasks as well as stored library of machine modules are captured in a common representation scheme. A simple design example to illustrate the application of this methodology for systematic selection and synthesis of reconfigurable machine tools is presented.

Generalized Kinematic Modeling Method for Reconfigurable Machine Tools

1998 ◽  
Author(s):  
Yong-Mo Moon ◽  
Sridhar Kota
Keyword(s):  
Machine Tools ◽  
Lead Time ◽  
Screw Theory ◽  
Integrated Design ◽  
Cost Effective ◽  
Kinematic Modeling ◽  
Effective Manner ◽  
Motion Characteristics ◽  
Set Up ◽  
Representation Scheme

Abstract Using a library of machine modules, modular machine tools are being developed by many machine tool manufacturers to reduce design lead time. To accommodate frequent changes in product design in a timely and cost-effective manner, the next generation of machine tools should be reconfigurable to process a family of products. This enables reduction not only in machine design lead time but more significantly a reduction in machine set-up and ramp-up time. The essential characteristics of Reconfigurable Machine Tools (RMTs) include modularity, convertibility, flexibility, and cost-effectiveness. Currently there is no systematic method of designing modular machines, let alone reconfigurable machines. This paper presents a methodology for kinematic synthesis of machine tools using screw theory. The motion characteristics of a set of desired machining tasks as well as stored library of machine modules are captured in a common representation scheme. A simple design example to illustrate the application of this methodology for systematic selection and synthesis of reconfigurable machine tools is presented. The proposed methodology can be extended to include the dynamic characteristics and control schemes to enable integrated design of machines and controllers.

scholarly journals Implementation Success of an Indoor Navigation with Location-Based Augmented Reality

2020 ◽  
Vol 8 (6) ◽  
pp. 367-373
Keyword(s):  
Augmented Reality ◽  
Cost Effective ◽  
Indoor Navigation ◽  
Mobile Technologies ◽  
Shopping Malls ◽  
Implementation Success ◽  
Indoor Location ◽  
Effective Manner ◽  
Set Up ◽  
Behavioral Intention To Use

Confirming the adoption and use of information technology is central to human-computer interaction. User experience (UX) and Usage Continuance (UC) which latently signifying implementation success are vocal upon this mechanism. The advent of smart phones and mobile technologies such as Geographical Positioning System (GPS) has seen great proliferation in positioning outdoor location. However, GPS is incapable to work in an indoor environment (Hub, 2008) properly. Hence, for navigating indoor location one need to combine the existing mobile technologies and most of their components with location-based augmented reality. In this paper, implementation success of Indoor Navigation with Location-Based Augmented Reality named ‘GuideMe” is studied. The factors considered to evaluate implementation success are adopted from information systems and mobile computer interface literature. The objectives of this paper are to determine users’ experience (satisfaction) and usage continuance of GuideMe. Prior to that, GuideMe has been successfully designed and developed using IOS with tools (Unity engine, Placenote SDK and XCode to set up IOS packages), User feedbacks are gathered via questionnaire forms taken from 35 respondents who volunteer to experiment GuideMe. The volunteers are free to choose and navigate offices at buildings of University of Jeddah (UJ), with the help of GuideMe. The findings of the study conclude that: GuideMe has facilitated users to navigate and seek indoor location independently, conveniently and efficiently since they did not disturb or asked others for directions. Hence, this has improved users’ experience which indicates users’ satisfaction. The high value of mean for “behavioral intention to use” has shown users intend to continue using GuideMe. This is further verified and confirmed by “expectation confirmation” analysis. These findings have the potential to deploy GuideMe to large complexes, such as airports, shopping malls, schools, hospitals and libraries in a cost-effective manner.

Pipelines Industry in India: Recent Developments and Future Requirements

2002 ◽  
Author(s):  
Harsukh Parekh ◽  
Vipin Chandra Sati
Keyword(s):  
Natural Gas ◽  
Oil And Gas ◽  
Private Investment ◽  
Cost Effective ◽  
Petroleum Products ◽  
High Rate ◽  
Indian Government ◽  
Effective Manner ◽  
Recent Developments ◽  
Set Up

The consumption of petroleum products in India has been growing at a high rate. In order to meet the growing demand for petroleum, additional refining capacity is planned to be created involving augmentation of some of the existing refineries and construction of new refineries. While the refineries will be in a position to meet the demand of petroleum products, the critical and vital issue will be to supply crude oil to the refineries and to reach the products to various consumption centers in an efficient, reliable and cost effective manner. In addition to the liquid petroleum, Natural Gas is emerging as the major source of energy/feedstock. Infrastructure for storage and transportation of Natural Gas are also required to be set up in a big way to meet the projected demand. This can best be done by constructing new pipelines which are recognized worldwide as the most reliable and cost effective mode of transportation of oil and gas. In addition to the requirement for new pipelines, there is a need for upgradation of technology in the existing cross-country pipelines, many of which are more than 20 years old. Moreover, Indian Government has, as part of the process of liberalisation of the economy through a series of measures focused on the infrastructural developments, technology upgradation, trade policies and financial reforms, has opened the core sector of Petroleum to private investment. Thus, considerable scope exists not only for consultants, equipment and material manufacturers/suppliers and contractors for providing their services but also for making investments in the Indian pipeline industry. This paper describes the prospects/opportunities in the Indian pipeline industry.

scholarly journals Prosthetic rehabilitation of a patient with enucleated eye - a case report

2012 ◽  
Vol 4 (2) ◽  
pp. 312-314 ◽  
Author(s):  
P Garg ◽  
S Garg ◽  
D Bansal ◽  
S Suresh
Keyword(s):  
Case Report ◽  
Cost Effective ◽  
Prosthetic Rehabilitation ◽  
Rehabilitation Process ◽  
Ocular Prosthesis ◽  
Effective Manner ◽  
Custom Made ◽  
Set Up ◽  
Anophthalmic Socket

Background: The loss of an eye has a crippling effect on the psychology of the patient, making rehabilitation process challenging for both doctor and patient. Objective: To report a case of anophthalmic socket with prosthetic rehabilitation in a cost effective manner. Case: A 32-year-old female presented with anophthalmic socket for prosthetic rehabilitation. A custom made ocular prosthesis was implanted successfully. Conclusion: The custom made ocular prosthesis is simple, affordable and can be carried out in a small clinical set-up and provides a superior natural appearance.DOI: http://dx.doi.org/10.3126/nepjoph.v4i2.6550 Nepal J Ophthalmol 2012; 4 (2): 312-314

Improving the Motions of a Semi by the Addition of Heave Plates

2008 ◽  
Author(s):  
Cheng-Yo Chen ◽  
Yun Ding ◽  
Trevor Mills ◽  
John Murray
Keyword(s):  
Gulf Of Mexico ◽  
Model Test ◽  
Cost Effective ◽  
Analytical Prediction ◽  
Test Results ◽  
Effective Manner ◽  
Truss Spar ◽  
Heave Plate ◽  
Motion Characteristics ◽  
Plate System

Similar to the manner in which heave plates provide a Truss Spar with low global motions, a heave plate system can be used to significantly mitigate the motions of a conventional semi-submersible. This paper will focus on the global performance of a conventional semi-submersible that has been properly configured with heave plates. The design case is a Gulf of Mexico deepwater environment similar to that for a Spar located in 5,600 feet of water. The system has eight top-tensioned risers (TTR) supported on the top of the semi hull with tensioners, a spread mooring and a 10,000-ton operating payload. Extensive global motion analyses and comprehensive model testing have been carried out to validate the in-place behavior of such a solution. This paper presents the validation results from the analytical prediction and the model test. A semi-submersible with properly configured heave plates can be used as a viable deepwater dry-tree floating solution in such harsh environments as in the Gulf of Mexico. Because of its superior motion characteristics, this solution is also more SCR friendly and can be a better wet-tree application as compared to conventional semi-submersibles. The analytical and model test results demonstrate that the excitation of a semi-submersible hull by wind, wave and current can be adequately mitigated by the proper placement and sizing of a heave plate system. The analysis and testing also indicates that to achieve suitable motions in a cost effective manner requires incorporating fabrication and installation issues into the heave plate system. The in-place behavior of this solution has been validated and thus proving the concept provides a viable cost effective dry-tree floating solution for deepwater developments.

Geometric error compensation method based on Floyd algorithm and product of exponential screw theory

2016 ◽  
Vol 232 (7) ◽  
pp. 1156-1171 ◽  
Author(s):  
Qiang Cheng ◽  
Bingwei Sun ◽  
Zhifeng Liu ◽  
Qiunan Feng ◽  
Peihua Gu
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Screw Theory ◽  
Cost Effective ◽  
Geometric Error ◽  
Error Modeling ◽  
Compensation Method ◽  
Machining Accuracy ◽  
Distance Method ◽  
Five Axis

Error compensation technique is a recognized and cost-effective method to improve machining accuracy of machine tools. In this article, a new compensation method for geometric error is proposed based on Floyd algorithm and product of exponential screw theory. Based on topological structure and measured data, volumetric geometric error modeling is established by product of exponential screw theory. Then, the improved Floyd minimum-distance method was used to establish an error compensation model by adjusting weight unceasingly. In order to verify the effectiveness and generality of the method proposed in this article, two experiments were designed. A total of 5 five-axis machining centers of the same type with different use time were selected to carry out the simulation experiments. Results show that the Floyd method can provide higher compensation precision, that is, Floyd algorithm compensation method can keep positioning errors within the range [−8 µm, 9 µm]. In addition, roundness error, coaxial error, and surface roughness were reduced in the actual machining experiments of two machined conical tables. Therefore, it can be seen that the proposed compensation method is effective to improve machining accuracy of machine tools.

Strategic planning in grassland farming: Principles andapplications

1997 ◽  
pp. 191-197
Author(s):  
W.J. Parker ◽  
N.M. Shadbolt ◽  
D.I. Gray
Keyword(s):  
Strategic Planning ◽  
Performance Indicators ◽  
Cost Effective ◽  
Key Performance Indicators ◽  
Strategic Plans ◽  
Effective Manner ◽  
Farm Business ◽  
Pastoral Farming ◽  
Financial Environment

Three levels of planning can be distinguished in grassland farming: strategic, tactical and operational. The purpose of strategic planning is to achieve a sustainable long-term fit of the farm business with its physical, social and financial environment. In pastoral farming, this essentially means developing plans that maximise and best match pasture growth with animal demand, while generating sufficient income to maintain or enhance farm resources and improvements, and attain personal and financial goals. Strategic plans relate to the whole farm business and are focused on the means to achieve future needs. They should be routinely (at least annually) reviewed and monitored for effectiveness through key performance indicators (e.g., Economic Farm Surplus) that enable progress toward goals to be measured in a timely and cost-effective manner. Failure to link strategy with control is likely to result in unfulfilled plans. Keywords: management, performance

scholarly journals Novel Regeneration Approach for Creating Reusable FO-SPR Probes with NTA Surface Chemistry

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 186
Author(s):  
Jia-Huan Qu ◽  
Karen Leirs ◽  
Remei Escudero ◽  
Žiga Strmšek ◽  
Roman Jerala ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Fluorescent Protein ◽  
Cost Effective ◽  
Nitrilotriacetic Acid ◽  
Antibody Fragments ◽  
Rapid Screening ◽  
Red Fluorescent Protein ◽  
Effective Manner ◽  
Surface Regeneration ◽  
Sensitivity Specificity

To date, surface plasmon resonance (SPR) biosensors have been exploited in numerous different contexts while continuously pushing boundaries in terms of improved sensitivity, specificity, portability and reusability. The latter has attracted attention as a viable alternative to disposable biosensors, also offering prospects for rapid screening of biomolecules or biomolecular interactions. In this context here, we developed an approach to successfully regenerate a fiber-optic (FO)-SPR surface when utilizing cobalt (II)-nitrilotriacetic acid (NTA) surface chemistry. To achieve this, we tested multiple regeneration conditions that can disrupt the NTA chelate on a surface fully saturated with His6-tagged antibody fragments (scFv-33H1F7) over ten regeneration cycles. The best surface regeneration was obtained when combining 100 mM EDTA, 500 mM imidazole and 0.5% SDS at pH 8.0 for 1 min with shaking at 150 rpm followed by washing with 0.5 M NaOH for 3 min. The true versatility of the established approach was proven by regenerating the NTA surface for ten cycles with three other model system bioreceptors, different in their size and structure: His6-tagged SARS-CoV-2 spike fragment (receptor binding domain, RBD), a red fluorescent protein (RFP) and protein origami carrying 4 RFPs (Tet12SN-RRRR). Enabling the removal of His6-tagged bioreceptors from NTA surfaces in a fast and cost-effective manner can have broad applications, spanning from the development of biosensors and various biopharmaceutical analyses to the synthesis of novel biomaterials.

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