Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method and device for vibration control of flexible risers

A flexible riser, vibration control technology, applied in mechanical oscillation control, non-electric variable control, adaptive control and other directions, can solve problems such as complex system analysis

Active Publication Date: 2021-09-28
GUANGZHOU UNIVERSITY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For marine flexible riser systems, mixed input nonlinearities complicate system analysis

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and device for vibration control of flexible risers
  • A method and device for vibration control of flexible risers
  • A method and device for vibration control of flexible risers

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0094] see figure 1 A method for controlling the vibration of a flexible riser provided in this embodiment can be executed by a related server, and the following descriptions will take the server as an execution subject as an example.

[0095] The method for vibration control of a flexible riser at least includes the following steps S1-S4.

[0096] S1. Obtain the dynamic equations of the saturated nonlinear input and the dead zone nonlinear input, and construct the input saturation model of the marine flexible riser system.

[0097] In a specific embodiment,

[0098] Kinetic equation, for

[0099]

[0100] boundary conditions, for

[0101]

[0102] y(0,t)=y'(0,t)=y"(l,t)=0.

[0103] It should be noted that y(l, t), y′(l, t), y″’(l, t) are y(l, t-1), y′(l, t-1), y″'(l, t-1) and time t Calculated by backward difference.

[0104] Among them, z and t represent independent time and space variables, y(z, t) is the vibration displacement of the standpipe at z at time t,...

no. 2 example

[0147] see figure 2 . This embodiment also proposes a device for controlling the vibration of the flexible riser, which is characterized in that it includes:

[0148] The first modeling module 21 is used to obtain dynamic equations of saturated nonlinear input and dead zone nonlinear input, and construct an input saturation model of the marine flexible riser system;

[0149] The second modeling module 22 is used to introduce an auxiliary system and a disturbance upper bound adaptive law according to the input saturation model to obtain a control rate formula;

[0150] The actual parameter acquisition module 23 is used to acquire the actual parameters of the marine flexible riser system, and calculate the boundary control rate at any time in combination with the control rate formula;

[0151] The control module 24 is configured to control the driving device to apply force to the marine flexible riser according to the boundary control rate.

[0152] In a specific embodiment,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and a device for controlling the vibration of a flexible riser. Wherein, the method includes: obtaining the dynamic equations of the saturated nonlinear input and the dead zone nonlinear input, and constructing the input saturation model of the marine flexible riser system; according to the input saturation model, introducing an auxiliary system and a disturbance upper bound adaptive obtain the control rate formula; obtain the actual parameters of the marine flexible riser system, and combine the control rate formula to calculate the boundary control rate at any time; control the driving device to the marine flexible riser according to the boundary control rate Apply force. The invention can reduce or even eliminate the influence of mixed nonlinear input on the control performance of the marine flexible riser system, and improve the stability of the system by improving the control precision and sensitivity of suppressing vibration.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a method and device for vibration control of a flexible riser. Background technique [0002] As energy demand decreases, oil and gas extraction tends to go to deep water. As an important part of offshore oil transmission, offshore flexible risers play a vital role in ocean development. For the large span of the marine flexible riser, under the influence of the harsh marine environment, the marine flexible riser will produce deformation and vibration. Excessive vibration will seriously affect the performance of the marine flexible riser system, reduce its service life, and may even cause serious economic losses and environmental pollution due to its damage. Therefore, structural vibration control in ocean development is an important and unavoidable problem. Boundary control is used as a practical approach to vibration control of flexible riser systems, which avoids th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G05D19/02G05B13/04
Inventor 赵志甲刘奕铭冯炼梅谭智峰李致富
Owner GUANGZHOU UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com