A Full-System Approach to Maximize Energy Efficiency of a Wheel Bearing

2020 ◽  
Author(s):  
Paolo Re ◽  
Francesco Lamboglia ◽  
Giorgio Missiaggia
2008 ◽  
Vol 130 (2) ◽  
Author(s):  
W. Habchi ◽  
D. Eyheramendy ◽  
P. Vergne ◽  
G. Morales-Espejel

The solution of the elastohydrodynamic lubrication (EHL) problem involves the simultaneous resolution of the hydrodynamic (Reynolds equation) and elastic problems (elastic deformation of the contacting surfaces). Up to now, most of the numerical works dealing with the modeling of the isothermal EHL problem were based on a weak coupling resolution of the Reynolds and elasticity equations (semi-system approach). The latter were solved separately using iterative schemes and a finite difference discretization. Very few authors attempted to solve the problem in a fully coupled way, thus solving both equations simultaneously (full-system approach). These attempts suffered from a major drawback which is the almost full Jacobian matrix of the nonlinear system of equations. This work presents a new approach for solving the fully coupled isothermal elastohydrodynamic problem using a finite element discretization of the corresponding equations. The use of the finite element method allows the use of variable unstructured meshing and different types of elements within the same model which leads to a reduced size of the problem. The nonlinear system of equations is solved using a Newton procedure which provides faster convergence rates. Suitable stabilization techniques are used to extend the solution to the case of highly loaded contacts. The complexity is the same as for classical algorithms, but an improved convergence rate, a reduced size of the problem and a sparse Jacobian matrix are obtained. Thus, the computational effort, time and memory usage are considerably reduced.


2018 ◽  
Vol 17 (3) ◽  
pp. 501-529 ◽  
Author(s):  
Patrick T. Sekoai ◽  
Kelvin O. Yoro ◽  
Michael O. Bodunrin ◽  
Augustine O. Ayeni ◽  
Michael O. Daramola

2021 ◽  
Author(s):  
Arnab Raha ◽  
Soumendu Ghosh ◽  
Debabrata Mohapatra ◽  
Deepak A. Mathaikutty ◽  
Raymond Sung ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6207
Author(s):  
Rachael Sherman ◽  
Hariharan Naganathan ◽  
Kristen Parrish

Small commercial buildings, or those comprising less than 50,000 square feet of floor area, represent 94% of U.S commercial buildings by count and consume approximately 8% of the nation’s primary energy; as such, they represent a largely unexploited opportunity for energy savings. Small commercial buildings also represent a large economic market—the National Institute of Building Sciences (NIBS) estimated the small commercial retrofit market at USD 35.6 billion. Despite the prominence of small commercial buildings and the economic opportunity for energy retrofits, many energy efficiency programs focus on large commercial buildings, and create efficiency solutions that do not meet the needs of the small commercial market. This paper presents an analysis of 34 small commercial case study projects that implemented energy efficiency retrofits. This paper contributes to the existing building retrofit body of knowledge in the following ways: (1) it identifies the decision criteria used by small commercial building stakeholders that decided to complete an energy retrofit; (2) it identifies the most commonly implemented efficiency measures in small commercial buildings, and discusses why this is the case; and (3) it provides empirical evidence about the efficacy of installing single energy efficiency measures (EEMs) compared to packages of EEMs in small commercial buildings by reporting verified energy savings. To the authors’ knowledge, this paper is the first to catalog decision criteria and energy savings for the existing small commercial buildings market, and this research illustrates that small commercial building decision-makers seem most motivated to retrofit their spaces by energy cost savings and operational concerns. Furthermore, small commercial building decision-makers opted to implement single-system retrofits in fifteen (15) of the thirty-four cases studied. Finally, this research documents the improved savings, in the small commercial buildings market, associated with a more integrated package of EEMs compared to a single-system approach, achieving approximately 10% energy savings for a single-system approach and more than 20% energy savings for integrated approaches. These savings translate to CO2 savings of 1,324,000 kgCO2/year to 2,647,000 kgCO2/year, respectively, assuming small commercial buildings are retrofit at a rate of 0.95% of the stock annually.


2018 ◽  
Vol 26 (1) ◽  
Author(s):  
Faaris Mujaahid ◽  
Doane Puri Mustika ◽  
Ramadoni Syahputra ◽  
Karisma Trinanda Putra ◽  
Kunnu Purwanto

Kybernetes ◽  
2017 ◽  
Vol 46 (10) ◽  
pp. 1735-1752 ◽  
Author(s):  
Rodolfo A. Fiorini

Purpose This paper aims to offer an innovative and original solution methodology proposal to the problem of arbitrary complex multiscale (ACM) ontological uncertainty management (OUM). The solution is based on the postulate that society is an ACM system of purposive actors within continuous change. Present social problems are multiscale-order deficiencies, which cannot be fixed by the traditional hierarchical approach alone, by doing what one does better or more intensely, but rather by changing the way one does it. Design/methodology/approach This paper treasures several past guidelines, from McCulloch, Wiener, Conant, Ashby and von Foerster to Bateson, Beer and Rosen’s concept of a non-trivial system to arrive to an indispensable and key anticipatory learning system (ALS) component for managing unexpected perturbations by an antifragility approach as defined by Taleb. This ALS component is the key part of our new methodology called “computational information conservation theory (CICT) OUM” approach, based on brand new numeric system behavior awareness from CICT. Findings To achieve an antifragility behavior, next generation system must use new CICT OUM-like approach to face the problem of multiscale OUM effectively and successfully. In this manner, homeodynamic operating equilibria can emerge out of a self-organizing landscape of self-structuring attractor points in a natural way. Research limitations/implications This paper presents a relevant contribution toward a new post-Bertalanffy Extended Theory of Systems. Due to its intrinsic self-scaling properties, this system approach can be applied at any system scale: from single quantum system application development to full system governance strategic assessment policies and beyond. Practical implications The new post-Bertalanffy Extended Theory of Systems Framework allows, for the first time, social, biological and biomedical engineering ideal system categorization levels, from an operational perspective, to be matched exactly to practical system modeling interaction styles, with no paradigmatic operational ambiguity and information loss. Social implications Even new social and advanced health and wellbeing information application can successfully and reliably manage higher system complexity than contemporary ones, with a minimum of design specification and less system final operative environment knowledge at design level. The present paper offers for discussion an innovative solution proposal for the complex society and big government modeling and management approach. Originality/value Specifically, advanced wellbeing applications, high reliability organization, mission critical project system, very low technological risk and crisis management system can benefit highly from our new methodology called CICT OUM approach and related techniques. This paper presents a relevant contribution toward a new post-Bertalanffy Extended Theory of Systems. Due to its intrinsic self-scaling properties, this system approach can be applied at any system scale: from a single quantum system application development to full system governance strategic assessment policies and beyond.


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