Time-domain solution for transient dynamic response of a large-diameter thin-walled pipe pile

2015 ◽  
Vol 14 (2) ◽  
pp. 239-251 ◽  
Author(s):  
Xuanming Ding ◽  
Hanlong Liu ◽  
Jian Chu ◽  
Ke Cheng
Keyword(s):  
Dynamic Response ◽  
Time Domain ◽  
Large Diameter ◽  
Transient Dynamic ◽  
Pipe Pile ◽  
Thin Walled Pipe ◽  
Thin Walled ◽  
Transient Dynamic Response

scholarly journals Virtual DC Motor Stability Control Method Considering New Energy Generation Fluctuation

2021 ◽  
Vol 2113 (1) ◽  
pp. 012015
Author(s):  
Yilun Tan ◽  
Yucheng Wang
Keyword(s):  
Dynamic Response ◽  
Control Method ◽  
Rapid Development ◽  
Regional Distribution ◽  
Energy Generation ◽  
Dc Motor ◽  
Stability Control ◽  
Transient Dynamic ◽  
New Energy ◽  
Transient Dynamic Response

Abstract With the rapid development of new energy generation, the intermittence and randomicity of its power output will have a significant impact on the transmission capacity of DC motor. Therefore, a virtual DC motor stability control method considering the fluctuation of new energy generation is proposed. The natural frequencies and modes of the virtual DC motor shafting rotor are analyzed by means of a steady sinusoidal excitation at zero speed. Considering the transient dynamic response of the shafting rotor of virtual DC motor under the fluctuation of new energy generation, Taylor series and transfer acceleration matrix method are used to calculate the transient dynamic response of shafting rotor under the fluctuation of new energy generation, and the parameters of virtual DC motor are identified and estimated. Based on this, a proportional resonance controller is designed to realize the stability control of virtual DC motor. Experimental results show that the interactive power curve between virtual DC motor and regional distribution network is smoother after optimal control, and this method can effectively improve the power balance ability of virtual DC motor.

An Adaptive Time Stepping Method for Transient Dynamic Response Analysis

2016 ◽  
Vol 6 (2) ◽  
pp. 152-170
Author(s):  
Jianguo Huang ◽  
Huashan Sheng
Keyword(s):  
Dynamic Response ◽  
Response Analysis ◽  
Dynamic Response Analysis ◽  
Transient Dynamic ◽  
Time Stepping ◽  
Adaptive Time ◽  
Spatial Discretisation ◽  
Transient Dynamic Response ◽  
Adaptive Time Stepping ◽  
Reduced Problem

AbstractAn efficient adaptive time stepping method is proposed for transient dynamic response analysis, which is frequently encountered in civil engineering and elsewhere. The reduced problem following the spatial discretisation can be discretised in the time by a C0-continuous discontinuous Galerkin method, and the adaptive time stepping strategy is based on optimal a posteriori error estimates developed using the energy method. Some numerical experiments demonstrate the effectiveness of our approach.

Mooring Analysis of a Turret Moored FPSO in a Squall Environment

2015 ◽  
Author(s):  
Robert Oberlies ◽  
Amitava Guha ◽  
Scott Slocum
Keyword(s):  
Dynamic Response ◽  
Time Domain ◽  
Sensitivity Study ◽  
West African ◽  
Load Case ◽  
The West ◽  
Worst Case ◽  
Input Parameters ◽  
Computationally Intensive ◽  
Transient Dynamic Response

The transient dynamic response of a FPSO in a squall environment is dependent on several input parameters. Because the response’s dependence on these input parameters is unclear prior to performing the analysis, a large number of parameter combinations need to be considered to find the combination that gives a worst-case load or response as required by reference [1]. Because the required time-domain simulations are computationally intensive, there is often a practical need to limit the number of simulations that are performed, raising questions about how many are necessary to meet the analysis objectives. This study investigates the effect of different squall scenarios on a turret moored FPSO in the West African offshore environment. A large number of cases with selected vessel headings, squall types, squall approach directions and vessel drafts are studied and parameters affecting the critical mooring loads and turret positions are identified. Possible reductions in the load case matrix along with a sensitivity study of a few parameters affecting the results are also discussed.

Sign in / Sign up

Export Citation Format

Share Document