A reformulation of the stochastic load combination problem

2021 ◽  
Vol 91 ◽  
pp. 102094
Author(s):  
Mahesh D. Pandey ◽  
J.A.M. van der Weide ◽  
N. Manzana
Keyword(s):  
Load Combination ◽  
Combination Problem ◽  
Stochastic Load

Study on Combination Method of Stochastic Load Processes

2014 ◽  
Vol 915-916 ◽  
pp. 82-85
Author(s):  
Zhao Wei Shen ◽  
Xiao Hong Wang ◽  
Wei Liang Jin
Keyword(s):  
Cumulative Distribution Function ◽  
Limit State ◽  
Cumulative Distribution ◽  
Combination Method ◽  
Theoretical Derivation ◽  
Limit State Design ◽  
Load Combination ◽  
Stochastic Load ◽  
Stochastic Loads ◽  
Calculation Analysis

When more than one loads act on a structure,the combination of stochastic loads is generally considered in the design of the structure,Based on the theoretical derivation and numerical calculation analysis to the process of two common loads in Poisson square wave and Poisson impulse this paper presents the combination method of loads.i.e. The maximum intensity function of load combination is expressed by the cumulative distribution function in the limit state design. In addition,the result calculated during the limit state design is compared with those calculated by Turkstra and Monte Carlo methods and the analytical results show that the method proposed in this paper is feasible in the calculation of load combination.

Environmental Contours for Multicomponent Response

2014 ◽  
Author(s):  
Bernt J. Leira ◽  
Halvor Borgen Lindstad
Keyword(s):  
Cross Section ◽  
Gaussian Processes ◽  
Structural Design ◽  
Characteristic Time ◽  
Mechanical Design ◽  
Design Parameters ◽  
Flexible Riser ◽  
Environmental Processes ◽  
Load Combination ◽  
Combination Problem

Approaches for derivation of joint design parameters in relation to multi-component environmental processes are briefly summarized. Within the context of structural design, this is frequently referred to as a “load combination problem”. It is focused on application of design contours for analysis of such load combinations. Contours of this type can be utilized for cases where the different load processes are both correlated and uncorrelated. Existing procedures for construction of such contours are summarized, and extensions to situations where the characteristic time scales for the different process components are widely different are outlined. Development of such tools based on application of “translation processes” (i.e. transformed Gaussian processes) is highlighted. Analysis of mechanical design formulations which involve several interacting response quantities is further addressed. Utilization of so-called contour response tubes within such a framework is discussed. An example of application is given for a cross-section at the upper end of a flexible riser configuration where the interaction between the tension and curvature processes needs to be taken into accounted.

Panpsychism versus Panprotopsychism and the Subject-Summing Problem

2017 ◽  
Author(s):  
Philip Goff
Keyword(s):  
Macro Level ◽  
Human Beings ◽  
Making Sense ◽  
Combination Problem ◽  
The Subject ◽  
Micro Level ◽  
Russellian Monism ◽  
Nature Of Matter

This is the first of two chapters discussing the most notorious problem facing Russellian monism: the combination problem. This is actually a family of difficulties, each reflecting the challenge of how to make sense of everyday human and animal experience intelligibly arising from more fundamental conscious or protoconscious features of reality. Key challenges facing panpsychist and panpsychist forms of Russellian monism are considered. With respect to panprotopsychism, there is the worry that it collapses into noumenalism: the view that human beings, by their very nature, are unable to understand the concrete, categorical nature of matter. With respect to panpsychism, there is the subject-summing problem: the difficulty making sense of how micro-level conscious subjects combine to produce macro-level conscious subjects. A solution to the subject-summing problem is proposed, and it is ultimately argued that panpsychist forms of the Russellian monism are to be preferred on grounds of simplicity and elegance.

Numerical and Experimental Investigation of Heat Transfer Enhancement Using Heat Pipes for Electronic Cooling

2018 ◽  
Author(s):  
Ning Zhang ◽  
Pankaj R. Chandra ◽  
Ryan Robledo ◽  
Sree Harsha Balijepalli
Keyword(s):  
Heat Transfer ◽  
Heat Pipes ◽  
Copper Plate ◽  
Heat Sinks ◽  
Modern World ◽  
Processing Unit ◽  
Maximum Heat ◽  
Central Processing ◽  
Load Combination ◽  
Maximum Heat Transfer

Computers are crucial to nearly every endeavor in the modern world. Some computers, particularly those used in military applications, are required to endure extreme conditions with limited maintenance and few parts. Units such as these will hereafter be referred to as “rugged computers.” This series of experiments aims to produce improvements to rugged computers currently in service. Using heat pipes and finned heat sinks on an enclosed box, a computer’s Central Processing Unit (CPU) is able to reject heat without suffering contamination from unforgiving environments. A modular prototype was designed to allow for three distinct cases; a case with no heat pipes and fins, a cast with heat-pipes mounted internally with exterior fins and a case with heat-pipes extended externally with exterior fins. Each case was tested at three different heat loads, with a copper plate heated by a silicone heat strip simulating the heat load generated by a CPU. Each case/load combination was run many times to check for repeatability. The aim of this research is to discover the ideal case for maximum heat transfer from the CPU to the external environment. In addition to the experiments, numerical simulation of these modular prototypes with different designs of heat pipes were conducted in this research. Creating an accurate model for computer simulations will provide validation for the experiments and will prove useful in testing cases not represented by the modular prototype. The flow and heat transfer simulations were conducted using Autodesk CFD. The aim here is to create a model that accurately reflects the experimentally-verified results from the modular prototype’s cases and loads, thereby providing a base from whence further designs can branch off and be simulated with a fair degree of accuracy.

A stochastic load model for an electricity market

2006 ◽  
Vol 76 (6-7) ◽  
pp. 500-508 ◽  
Author(s):  
N.S. Sisworahardjo ◽  
A.A. El-Keib ◽  
J. Choi ◽  
J. Valenzuela ◽  
R. Brooks ◽  
...  
Keyword(s):  
Electricity Market ◽  
Load Model ◽  
Stochastic Load

Load Combination for Fatigue Analysis of Ship Structures

2004 ◽  
Author(s):  
Yung S. Shin ◽  
Booki Kim ◽  
Alexander J. Fyfe
Keyword(s):  
Bending Moment ◽  
Linear Summation ◽  
Load Combination ◽  
Longitudinal Stiffeners ◽  
Stress Components ◽  
Tank Pressure ◽  
Wave Induced ◽  
Vertical Bending Moment ◽  
Oil Tanker

A methodology for calculating the correlation factors to combine the long-term dynamic stress components of ship structure from various loads in seas is presented. The methodology is based on a theory of a stationary ergodic narrow-banded Gaussian process. The total combined stress in short-tem sea states is expressed by linear summation of the component stresses with the corresponding combination factors. This expression is proven to be mathematically exact when applied to a single random sea. The long-term total stress is similarly expressed by linear summation of component stresses with appropriate combination factors. The stress components considered here are due to wave-induced vertical bending moment, wave-induced horizontal bending moment, external wave pressure and internal tank pressure. For application, the stress combination factors are calculated for longitudinal stiffeners in cargo and ballast tanks of a crude oil tanker at midship section. It is found that the combination factors strongly depend on wave heading and period in the short-term sea states. It is also found that the combination factors are not sensitive to the selected probability of exceedance level of the stress in the long-term sense.

scholarly journals Optimization of Stochastic Lossy Transport Networks and Applications to Power Grids

2021 ◽  
Author(s):  
Alessandro Zocca ◽  
Bert Zwart
Keyword(s):  
Mathematical Model ◽  
Renewable Energy ◽  
Smart Grids ◽  
Transport Network ◽  
Power Grids ◽  
Performance Gain ◽  
Power Losses ◽  
Transport Networks ◽  
Trade Off ◽  
Stochastic Load

Motivated by developments in renewable energy and smart grids, we formulate a stylized mathematical model of a transport network with stochastic load fluctuations. Using an affine control rule, we explore the trade-off between the number of controllable resources in a lossy transport network and the performance gain they yield in terms of expected power losses. Our results are explicit and reveal the interaction between the level of flexibility, the intrinsic load uncertainty, and the network structure.

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