公开(公告)号：US20190219475A1

公开(公告)日：2019-07-18

申请号：US16338356

申请日：2017-08-28

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Fuyou XU ,  Donglei ZENG ,  Jing YANG

IPC: G01M7/06 ,  G01M9/02

CPC classification number: G01M7/06 ,  G01M7/00 ,  G01M9/02

Abstract: The invention provides a large-amplitude vertical-torsional coupled free vibration device, which belongs to the technical field of vertical-torsional coupled free vibration device for wind tunnel test. The gear blocks are consolidated at both ends of the beam. The screws, beam, and the gear blocks are fixed on the model, and they can fulfil the vertical-torsional coupled free vibration. The toothed plate is attached to the sliding block that iteratively moving along the vertical guide rail which is fixed to the ground. The vertical springs attached to the sliding blocks provide both vertical and torsional linear stiffness for the suspension vibration system. The springs only have vertical linear tensile deformations without any lateral tilt, which ensures the linear vertical and torsional stiffness of the model, and the lateral freedom is effectively restrained. This device can achieve the large-amplitude vertical-torsional coupled free vibration of the model, and the deficiency of the traditional device where springs are apparently tilted and the inefficacy of linear stiffness can be avoided. The lateral vibration is restrained, and it is applicable to large-amplitude vertical-torsional coupled free vibrations.

公开(公告)号：US20200232875A1

公开(公告)日：2020-07-23

申请号：US16481427

申请日：2018-03-05

Applicant: Dalian University of Technology

Inventor： Fuyou XU ,  Jing YANG ,  Donglei ZENG

IPC: G01M9/04 ,  G01M9/08

Abstract: An experimental setup for bridge deck large-amplitude vertical-torsional coupled free vibration in wind tunnel test, which belongs to the technical field of wind tunnel test apparatus. The experimental setup includes the rigid model, the rigid circular rods, the lightweight rigid circular sprockets, the chains, the linear tensile vertical springs, the bearings, the sliders, and the guides. For the new setup, large-amplitude vertical-torsional coupled free vibration of a rigid deck model that failed in conventional testing device can be adapted by the vertical deformation of the springs without any lateral tilt. As a result, the possible nonlinear mechanical stiffness due to the springs tilt in conventional testing device is excluded. In addition, owing to the low rolling friction and damping between the sprockets and the chains, the mechanical damping ratio of the system are quite low and stable for very large-amplitude vibrations.