Direct calculation of tightly focused field in an arbitrary plane

2019 ◽  
Vol 450 ◽  
pp. 329-334 ◽  
Author(s):  
Yanan Cai ◽  
Zhaojun Wang ◽  
Yansheng Liang ◽  
Feifei Ren ◽  
Baoli Yao ◽  
...  
Keyword(s):  
Direct Calculation ◽  
Arbitrary Plane

MICROSCALE DIRECT CALCULATION OF SOLID PHASE CONDUCTIVITY OF VORONOI'S FOAMS

2013 ◽  
Vol 16 (5) ◽  
pp. 411-426 ◽  
Author(s):  
Jaona Randrianalisoa ◽  
Remi Coquard ◽  
Dominique Doermann Baillis
Keyword(s):  
Solid Phase ◽  
Direct Calculation ◽  
Solid Phase Conductivity ◽  
Phase Conductivity

Optimizing preventive maintenance over a finite planning horizon in a semi-Markov framework

2020 ◽  
Author(s):  
Antonio Sánchez Herguedas ◽  
Adolfo Crespo Márquez ◽  
Francisco Rodrigo Muñoz
Keyword(s):  
Preventive Maintenance ◽  
Recurrence Relations ◽  
Direct Calculation ◽  
Planning Horizon ◽  
Practical Implementation ◽  
Practical Application ◽  
Mathematical Solution ◽  
Accumulated Reward ◽  
Finite Planning Horizon

Abstract This paper describes the optimization of preventive maintenance (PM) over a finite planning horizon in a semi-Markov framework. In this framework, the asset may be operating, and providing income for the asset owner, or not operating and undergoing PM, or not operating and undergoing corrective maintenance following failure. PM is triggered when the asset has been operating for τ time units. A number m of transitions specifies the finite horizon. This system is described with a set of recurrence relations, and their z-transform is used to determine the value of τ that maximizes the average accumulated reward over the horizon. We study under what conditions a solution can be found, and for those specific cases the solution τ* is calculated. Despite the complexity of the mathematical solution, the result obtained allows the analyst to provide a quick and easy-to-use tool for practical application in many real-world cases. To demonstrate this, the method has been implemented for a case study, and its accuracy and practical implementation were tested using Monte Carlo simulation and direct calculation.

Toward the direct calculation of noise - Fluid/acoustic coupled simulation

AIAA Journal ◽  
1995 ◽  
Vol 33 (12) ◽  
pp. 2271-2279 ◽  
Author(s):  
K. Viswanathan ◽  
L. N. Sankar
Keyword(s):  
Direct Calculation ◽  
Coupled Simulation
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