Blar i NTNU Open på forfatter "Verma, Amrit Shankar"
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A comprehensive numerical investigation of the impact behaviour of an offshore wind turbine blade due to impact loads during installation
Verma, Amrit Shankar; Vedvik, Nils Petter; Gao, Zhen (Journal article, 2019)For installing offshore wind turbines into deep waters, use of floating crane vessels is essential. One of the major challenges is their sensitivity to wave-induced vessel and crane tip motions, which can cause the impact ... -
A Global-local Damage Assessment Methodology for Impact Damage on Offshore Wind Turbine Blades during Lifting Operations
Verma, Amrit Shankar; Haselbach, Philipp Ulrich; Vedvik, Nils Petter; Gao, Zhen (Chapter, 2018)Lifting the latest generation offshore wind turbines using floating crane vessels is extremely challenging. This comes with an elevated risk of blades impacting the tower or surrounding structures due to excessive crane ... -
A Summary of the Recent Work at NTNU on Marine Operations Related to Installation of Offshore Wind Turbines
Gao, Zhen; Verma, Amrit Shankar; Zhao, Yuna; Jiang, Zhiyu; Ren, Zhengru (Chapter, 2018)In this paper, a summary of the recent work at NTNU on the installation of offshore wind turbines using jack-up and floating vessels will be reported. The wind turbine components considered here are the monopile foundations ... -
Comparison of numerical modelling techniques for impact investigation on a wind turbine blade
Verma, Amrit Shankar; Vedvik, Nils Petter; Haselbach, Philipp Ulrich; Gao, Zhen; Jiang, Zhiyu (Journal article; Peer reviewed, 2019)Wind turbine blades are exposed to numerous impact risks throughout their lifetimes. The impact risks range from bird collisions during operation to impacts with surrounding structures at the time of transportation and ... -
Explicit Structural Response-Based Methodology for Assessment of Operational Limits for Single Blade Installation for Offshore Wind Turbines
Verma, Amrit Shankar; Zhao, Yuna; Gao, Zhen; Vedvik, Nils Petter (LNCE;volume 23, Chapter; Conference object, 2019)The growing requirements of large-sized offshore wind turbines require heavier components to be lifted to large heights using installation vessels. This imposes a substantial risk of impact to the lifted components especially ... -
Impact assessment of a wind turbine blade root during an offshore mating process
Verma, Amrit Shankar; Jiang, Zhiyu; Vedvik, Nils Petter; Gao, Zhen; Ren, Zhengru (Journal article; Peer reviewed, 2019)Single-blade installation is a popular method for installing blades on bottom-fixed offshore wind turbines. A jack-up crane vessel is often employed, and individual blades with their roots equipped with mechanical joints ... -
Integrated GNSS/IMU Hub Motion Estimator for Offshore Wind Turbine Blade Installation
Ren, Zhengru; Skjetne, Roger; Jiang, Zhiyu; Gao, Zhen; Verma, Amrit Shankar (Journal article; Peer reviewed, 2019)Offshore wind turbines (OWTs) have become increasingly popular for their ability to harvest clean offshore wind energy. Bottom-fixed foundations are the most used foundation type. Because of its large diameter, the foundation ... -
Modelling, Analysis and Response-Based Operability Assessment of Offshore Wind Turbine Blade Installation with Emphasis on Impact Damages
Verma, Amrit Shankar (Doctoral theses at NTNU;2019:347, Doctoral thesis, 2019)Installing wind turbine blades is a highly demanding task due to their large lifting height and the requirements of high precision. The single blade installation method – where individual blades are lifted using a jack-up ... -
Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines
Verma, Amrit Shankar; Jiang, Zhiyu; Ren, Zhengru; Gao, Zhen; Vedvik, Nils Petter (Journal article; Peer reviewed, 2019)Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the ... -
Structural Safety Assessment of Marine Operations From a Long-Term Perspective: A Case Study of Offshore Wind Turbine Blade Installation
Verma, Amrit Shankar; Gao, Zhen; Jiang, Zhiyu; Ren, Zhengru; Vedvik, Nils Petter (Chapter, 2019)A marine operation is a complex non-routine activity of limited duration carried out in offshore environment. Due to safety reasons, these operations are normally performed within specific sea state limits, which are derived ...