Demonstration of an Airframe Digital Twin Framework Using a CF-188 Full-Scale Component Test

A digital twin for lift planning with offshore heave compensated cranes

Journal of Offshore Mechanics and Arctic Engineering ◽

10.1115/1.4048881 ◽

2020 ◽

pp. 1-29

Author(s):

Geir-Arne Moslått ◽

Damiano Padovani ◽

Michael Hansen

Keyword(s):

Simulation Model ◽

State Of The Art ◽

Full Scale ◽

Acceptance Criteria ◽

Digital Twin ◽

Digital Twins

Abstract This paper presents a state-of-the-art digital twin of a hydraulic actuated winch that is used for heave compensation in offshore applications. The digital twin is used as part of a larger simulation model that involves all necessary components to perform lift planning and, subsequently, determine the corresponding weather window. The winch simulation model is described and verified by means of full-scale measurements. In addition, a set of acceptance criteria are presented that should be used whenever verifying digital twins of heave compensating winches that are to be used for lift planning.

Download Full-text

HCF Component Tests on Full-Scale Low Pressure Steam Turbine End Stage Blades

Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines ◽

10.1115/gt2016-56988 ◽

2016 ◽

Cited By ~ 3

Author(s):

Shilun Sheng ◽

Johan Flegler ◽

Balazs Janos Becs ◽

Michael Dankert

Keyword(s):

Steam Turbine ◽

Low Cycle Fatigue ◽

Renewable Energy Sources ◽

Low Pressure ◽

Full Scale ◽

Test Facility ◽

Future Market ◽

Cycle Fatigue ◽

Component Test ◽

End Stage

The design of steam turbine components is driven by high efficiency demands and also requirements for increased operational flexibility due to more renewable energy sources being added to the grid. Therefore, fossil power plants which operate reliably under these conditions must be designed. Robust low pressure (LP) end stage blades are one key factor for modern steam turbine design to meet current and future market requirements. In operation, LP end stage blades of steam turbines are exposed to complex mechanical load, resulting in stresses mainly due to blade vibration and high centrifugal forces. Design methods accounting for high cycle fatigue (HCF) and low cycle fatigue (LCF) are required for fatigue lifetime calculation. To determine the HCF component strength and to validate the calculation procedure, an HCF component test facility for full-scale LP end stage blades has recently been established at Siemens. Besides the validation of the calculation procedures, the full-scale component tests serve as part of upfront validation to minimize risk for first time implementation of newly developed as well as next generation blades, and to demonstrate operational robustness of the existing fleet. This paper describes the development and setup of the HCF component test facility for full-scale LP end stage blades at Siemens, the successful execution of HCF component tests with blades of different sizes, surface conditions and materials, and the evaluation of the results. In addition, crack growth and threshold behavior has been investigated in detail. Based on the test results, validation of the corresponding calculation methods has been performed. An outlook on further development of test facilities is provided.

Download Full-text

Component Test of the Full Scale MFPS Base Isolator

Seismic Engineering, Volume 1 ◽

10.1115/pvp2004-2956 ◽

2004 ◽

Author(s):

C. S. Tsai ◽

Tsu-Cheng Chiang ◽

Bo-Jen Chen ◽

Mei-Jou Chen

Keyword(s):

Mechanical Behavior ◽

Base Isolation ◽

Full Scale ◽

Experimental Results ◽

Shaking Table ◽

Engineering Applications ◽

Pendulum System ◽

Existing Structures ◽

Component Test ◽

Base Isolator

In recent years, there have been more and more engineering applications of the base isolation to enhance the seismic resistibility of the existing structures. The elastomeric base isolator and the sliding base isolator are the most popular types in the engineering applications. In this paper, the experimental results for the component test of the full scale multiple friction pendulum system (MFPS) have been introduced. The MFPS base isolator is a base isolator which possesses characteristics of the elastomeric and sliding type base isolators. The effectiveness of the device in reducing the seismic response of structures during earthquakes has been confirmed from the experimental results of the shaking table tests. In order to test the mechanical behavior of a full scale MFPS base isolator, the component tests of the device subjected axial loads of 500 tons, 900 tons and horizontally cyclic loadings have been executed. The experimental results show that the MFPS base isolator has a very stable mechanical behavior under many cycles of loadings. Hence, the durability of the MFPS base isolator can be proved from these experimental results.

Download Full-text

Comparison of added resistance methods using digital twin and full-scale data

Ocean Engineering ◽

10.1016/j.oceaneng.2021.108710 ◽

2021 ◽

pp. 108710 ◽

Cited By ~ 1

Author(s):

Bhushan Taskar ◽

Poul Andersen

Keyword(s):

Full Scale ◽

Added Resistance ◽

Digital Twin ◽

Scale Data

Download Full-text

Relation of Statistically Significant, Abnormal, and Typical WAIS-R VIQ-PIQ Discrepancies to Full Scale IQs

European Journal of Psychological Assessment ◽

10.1027//1015-5759.16.2.107 ◽

2000 ◽

Vol 16 (2) ◽

pp. 107-114 ◽

Cited By ~ 3

Author(s):

Louis M. Hsu ◽

Judy Hayman ◽

Judith Koch ◽

Debbie Mandell

Keyword(s):

Graphical Method ◽

The United States ◽

Full Scale ◽

True Score ◽

Absolute Value ◽

Normative Population ◽

The Us ◽

The Mean ◽

And Performance ◽

Quadratic Models

Summary: In the United States' normative population for the WAIS-R, differences (Ds) between persons' verbal and performance IQs (VIQs and PIQs) tend to increase with an increase in full scale IQs (FSIQs). This suggests that norm-referenced interpretations of Ds should take FSIQs into account. Two new graphs are presented to facilitate this type of interpretation. One of these graphs estimates the mean of absolute values of D (called typical D) at each FSIQ level of the US normative population. The other graph estimates the absolute value of D that is exceeded only 5% of the time (called abnormal D) at each FSIQ level of this population. A graph for the identification of conventional “statistically significant Ds” (also called “reliable Ds”) is also presented. A reliable D is defined in the context of classical true score theory as an absolute D that is unlikely (p < .05) to be exceeded by a person whose true VIQ and PIQ are equal. As conventionally defined reliable Ds do not depend on the FSIQ. The graphs of typical and abnormal Ds are based on quadratic models of the relation of sizes of Ds to FSIQs. These models are generalizations of models described in Hsu (1996) . The new graphical method of identifying Abnormal Ds is compared to the conventional Payne-Jones method of identifying these Ds. Implications of the three juxtaposed graphs for the interpretation of VIQ-PIQ differences are discussed.

Download Full-text

A Modification of the Payne-Jones Method of Identifying Abnormal Differences in WISC-R Performance and Verbal IQ's

European Journal of Psychological Assessment ◽

10.1027/1015-5759.12.1.27 ◽

1996 ◽

Vol 12 (1) ◽

pp. 27-32 ◽

Cited By ~ 1

Author(s):

Louis M. Hsu

Keyword(s):

Full Scale ◽

True Score ◽

Verbal Iq ◽

Score Difference ◽

The Difference ◽

And Performance

The difference (D) between a person's Verbal IQ (VIQ) and Performance IQ (PIQ) has for some time been considered clinically meaningful ( Kaufman, 1976 , 1979 ; Matarazzo, 1990 , 1991 ; Matarazzo & Herman, 1985 ; Sattler, 1982 ; Wechsler, 1984 ). Particularly useful is information about the degree to which a difference (D) between scores is “abnormal” (i.e., deviant in a standardization group) as opposed to simply “reliable” (i.e., indicative of a true score difference) ( Mittenberg, Thompson, & Schwartz, 1991 ; Silverstein, 1981 ; Payne & Jones, 1957 ). Payne and Jones (1957) proposed a formula to identify “abnormal” differences, which has been used extensively in the literature, and which has generally yielded good approximations to empirically determined “abnormal” differences ( Silverstein, 1985 ; Matarazzo & Herman, 1985 ). However applications of this formula have not taken into account the dependence (demonstrated by Kaufman, 1976 , 1979 , and Matarazzo & Herman, 1985 ) of Ds on Full Scale IQs (FSIQs). This has led to overestimation of “abnormality” of Ds of high FSIQ children, and underestimation of “abnormality” of Ds of low FSIQ children. This article presents a formula for identification of abnormal WISC-R Ds, which overcomes these problems, by explicitly taking into account the dependence of Ds on FSIQs.

Download Full-text