公开(公告)号：US11827314B2

公开(公告)日：2023-11-28

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 ,  B63B21/36 ,  B63B21/26

CPC classification number: B63B21/243 ,  B63B21/24 ,  B63B21/26 ,  B63B21/36 ,  B63B2021/265

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：US10384746B2

公开(公告)日：2019-08-20

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

Abstract: An anchor booster is designed to increase the final penetration depth of the gravity installed plate anchor. Moreover, the booster can also improve the directional stability of the gravity installed plate 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. The shaft rear is set with three slots thus the rear fins can be inserted into the slots to improve the directional stability of the hybrid anchor (i.e. the gravity installed plate 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.

公开(公告)号：US11300585B2

公开(公告)日：2022-04-12

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：US10962460B2

公开(公告)日：2021-03-30

申请号：US16329652

申请日：2017-12-27

Applicant: Dalian University of Technology

Inventor： Jun Liu

IPC: G01N11/12 ,  E21B45/00 ,  E02D1/02

Abstract: A free fall ball penetrometer with a booster is dynamically penetrated into the seabed through its kinetic and potential energies. The main measuring instrument is a ball penetrometer, which is subject to end bearing resistance, drag force, and soil buoyant force during the dynamic penetration process within the soil. Based on the measured data from the accelerometer and load cell, the soil strength parameters including the undrained shear strength and strain-rate parameter can be back-analyzed. The added booster can: (1) effectively increase the penetration depth of the ball penetrometer and hence enlarge the range of measured penetration depths; and (2) improve the directional stability and avoid the rotation of the ball penetrometer during the falling process. The force data measured from the load cell, together with the acceleration data from the accelerometer, can further improve the measured accuracy.