Curve linearization and discretization for meshing composite parametric surfaces

Laug, Patrick; Borouchaki, Houman

doi:10.1002/cnm.725

Cited by 17 publications

(9 citation statements)

References 10 publications

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“…Lastly, in consideration of feasibility and effectiveness, one of the efficient curve fitting methods, curve linearization method, was adopted to implement the fitting operation for quadratic curve fitting. Curve linearization is an important curve fitting method that transforms curve fitting into linear fitting through variable substitution [33]. Figure 3 presents the fitting curve of parameter k and driving speed.…”

Section: Model Framementioning

confidence: 99%

A data-based model for driving distance estimation of battery electric logistics vehicles

Wang

Zhang

2018

J Wireless Com Network

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Battery electric logistics vehicles (BELVs) reduce transportation costs and air pollution unlike conventional logistics vehicles. However, the limited driving range of BELVs creates new problems for logistics transport. Accurate driving distance estimation of BELVs can help logistics companies determine transport strategies and alleviate the range anxiety of drivers. Based on mass data from BELVs operating in Beijing, China, this study uses a practical and effective data-based modeling method, regression analysis, to establish the data-based model of driving distance estimation. During the modeling process, a nonlinear relation between percentage of energy consumption per kilometer and driving speed is explored based on the experimental data. After determining the model variables, the model frame of driving distance in consideration of driving speed and state of charge is established. The forgetting factor recursive least-squares algorithm is applied to estimate the parameter values of the model. Verification results confirm the feasibility of the model and show that the model errors are small. The proposed model is also used to explore the economical driving speed of BELVs.

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Section: Model Framementioning

confidence: 99%

A data-based model for driving distance estimation of battery electric logistics vehicles

Wang

Zhang

2018

J Wireless Com Network

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“…To reduce errors because of curve linearisation, it is better to disperse the yield stresses irregularly [26]. This yields…”

Section: Stress–strain Response Modellingmentioning

confidence: 99%

Damage Operator‐Based Lifetime Calculation Under Thermomechanical Fatigue and Creep for Application on Uginox F12T EN 1.4512 Exhaust Downpipes

Nagode

Šeruga

Hack³

et al. 2011

Strain

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The article focuses on the application of a recently developed damage operator‐based lifetime calculation to a thermomechanically loaded exhaust downpipe. The damage operator approach enabling online continuous damage calculations for isothermal and non‐isothermal loading with mean stress corrections is reviewed. The article also highlights an extension of the strain‐life approach to take into account viscoplastic effects and creep. The transient results from thermal and structural analyses using finite element analyses have been applied to the exhaust downpipe in LMS Virtual.Lab and the damage predicted. Tested exhaust downpipes were then subjected to the same loading conditions as in the calculation, and load cycles were repeated up to the point of failure. Simulated and test results are comparable.

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“…The Prandtl densities γ j ( T i ) as well as fictive yield damage parameters p j in the range j = 1, …, n p are gained from the available PD curves. Fictive yield damage parameters, also known as the half‐widths of the play operator, 16 are dispersed regularly as shown in Refs [12, 22, 25] or better irregularly 27 to reduce too conservative damage estimates due to curve linearization between zero and the damage parameter corresponding to the maximum ultimate stress …”

Section: Continuous Damage Calculationmentioning

confidence: 99%

Low cycle thermo‐mechanical fatigue: damage operator approach

Nagode

Hack

Fajdiga

2010

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe strain-life approach is standardized and widely accepted for determining fatigue damage under strain-controlled low cycle fatigue (LCF) loading. It was first extended to non-isothermal cases by introducing an equivalent temperature approach (ETA). The paper presents its extension that is the damage operator approach (DOA) enabling online continuous damage calculation for isothermal and non-isothermal loading with mean stress correction. The cycle closure point, cycle equivalent temperature, threshold temperature and separate rainflow counting obligatory for the ETA are not necessary for the DOA any more. Both approaches are equivalent for the second and subsequent runs of block loading if temperature is constant. However, for non-isothermal cases, the DOA is within the worst and the best case scenarios of the ETA. The approaches are compared to the simple stress histories and several thermo-mechanical fatigue (TMF) cycle types. = cyclic stress-strain curve i = data point index j = fictive yield stress index, fictive yield damage parameter index k = temperature index K (T) = cyclic hardening coefficient K P = limit load ratio n p = index of the top fictive yield damage parameter n r = index of the top fictive yield stress n T = index of the top temperature n (T) = cyclic hardening exponent N f = number of cycles to failure p j = fictive yield damage parameter P , P (t i ) = damage parameter P a (t i ) = damage parameter amplitude P o (t i ) = damage parameter origin r j = fictive yield stress S * = nominal stress Correspondence: M. Nagode.

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Curve linearization and discretization for meshing composite parametric surfaces

Cited by 17 publications

References 10 publications

A data-based model for driving distance estimation of battery electric logistics vehicles

A data-based model for driving distance estimation of battery electric logistics vehicles

Damage Operator‐Based Lifetime Calculation Under Thermomechanical Fatigue and Creep for Application on Uginox F12T EN 1.4512 Exhaust Downpipes

Low cycle thermo‐mechanical fatigue: damage operator approach

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