公开(公告)号：US20200233012A1

公开(公告)日：2020-07-23

申请号：US16477189

申请日：2018-07-05

Applicant: Dalian University of Technology

Inventor： Jianbo LI ,  Kai YANG ,  Shiyun XIAO ,  Runyu MEI ,  Zhiqiang HU ,  Lei ZHOU ,  Jun LIU ,  Zhiyuan LI

IPC: G01P15/16

Abstract: An apparatus and method for measuring a structural angular acceleration based on dynamic centrifugal force measurement belong to the technical field of angular acceleration measurement. The apparatus has a solid ball. The solid ball can move freely along the radial direction of the outer wall packaging hood. The elastic block is used as a stress base. A rod for lateral limit and connection is used for connecting the rigid block and a pulley and limiting the displacement of solid ball so that the solid ball can only move longitudinally along the apparatus. The rigid block can move freely due to the pulley. Measurement of a transient angular acceleration is converted into dynamic measurement of the centrifugal force of the solid ball. Through the above design, the dynamic angular acceleration of the structure caused by dynamic load can be relatively accurately calculated.

公开(公告)号：US20210362810A1

公开(公告)日：2021-11-25

申请号：US17260128

申请日：2020-02-17

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Jun LIU ,  Congcong HAN ,  Xu WANG

IPC: B63B21/24

Abstract: The present invention relates to a hybrid dynamically installed anchor with a folding shank and a control method to keep the verticality of the hybrid anchor during free fall in the seawater, which can be applied to the field of offshore engineering. The hybrid anchor comprises a folding-shank plate anchor, a ballast shaft, an extension rod, a plurality of rear fins, and a recovery hole from the front to the tail. The folding shank is not only useful in reducing the water and soil resistance during installation, but also beneficial in improving the directional stability of the hybrid anchor during free fall in the seawater. The re-used shaft can significantly increase the penetration depth of the folding-shank plate anchor and reduce the installation cost at the same time. The control method keeping the verticality of the hybrid anchor can improve the success rate during anchor installation.

公开(公告)号：US20210277619A1

公开(公告)日：2021-09-09

申请号：US17258404

申请日：2019-02-23

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Jun LIU ,  Congcong HAN

IPC: E02D27/52 ,  E02D27/04 ,  E02D27/46 ,  E02D31/08

Abstract: The present invention relates to a free-sliding seabed mudmat foundation, which belongs to the fields of offshore and ocean engineering. The mudmat comprises a base foundation, an upper foundation, and a cover plate. The base foundation sits on the seabed to support dead weights of the mudmat itself and the subsea production system fixed on the mudmat. The upper foundation, with a plurality of universal rolling ball bearing being attached to the bottom, can slide on the base foundation when it is subjected to a horizontal push force generated by the pipeline during operation. Therefore, the axial load on the pipeline during operation due to heating and pressurization is released and the buckling failure risk is then reduced. The mudmat disclosed has smaller size and lighter weight, which is beneficial in reducing fabrication costs and reducing requirements for cranes on the pipeline laying vessel.

公开(公告)号：US20180346074A1

公开(公告)日：2018-12-06

申请号：US15776954

申请日：2017-04-10

Applicant: Dalian University of Technology

Inventor： Jun LIU ,  Congcong HAN ,  Yuxia HU

IPC: B63B21/26

CPC classification number: B63B21/26 ,  B63B2021/265 ,  Y02P20/124

Abstract: An anchor booster, which belongs to the field of ocean engineering, is designed to increase the final penetration depth of the OMNI-Max anchor. The anchor booster is attached to the tail of the OMNI-Max anchor to increase its impact velocity in water and penetration depth in seabed. Moreover, the booster can also improve the directional stability of the OMNI-Max anchor during its free fall in water. After installation, the booster is retrieved by pulling its retrieval line up and can be used for the subsequent installation. The booster is comprised of a cylindrical shaft with three rear fins. The shaft is designed with an ellipsoidal tip and a contracted rear to reduce the drag force during free fall in water and dynamic installation in seabed. The shaft rear is set with three slots separated by 120° in plane thus the rear fins can be inserted into the slots to improve the directional stability of the hybrid anchor (i.e. the OMNI-Max anchor with a booster). The booster tip is fabricated with a cylindrical slot and the anchor tail has a compatible bar, such that the booster can be connected to the anchor tail by a shear pin. The booster geometry is simple, allowing for cost effective fabrication. With the aid of a booster, the final penetration depth and thus the holding capacity of the OMNI-Max anchor can be increased to a great extent. Therefore, the safety factor is increased or the total cost is reduced for the mooring system.