公开(公告)号：US12188850B2

公开(公告)日：2025-01-07

申请号：US17741474

申请日：2022-05-11

Applicant: Beijing University of Technology

Inventor： Jinbao Ji ,  Sen Yang ,  Zongxiang Hu ,  Weiqi Zhang

IPC: G01M7/02

Abstract: A frequency domain feedforward compensation method based on a power exponential method for a seismic simulation shaking table is provided. According to the method, a frequency domain amplitude transfer function of a system is identified, the frequency domain amplitude transfer function is modified by adjusting the power and limiting an amplitude, then an inverse frequency domain amplitude transfer function is obtained, an amplitude and a phase of a driving acceleration signal are computed, finally a time domain driving acceleration signal is obtained by using the Euler's formula for computation in a complex domain and conducting inverse Fourier transform, the shaking table is driven again to collect an acceleration signal output by a table top, whether the acceleration signal meets a shaking table test waveform use requirement is determined, a test is finished under the condition that the acceleration signal meets the shaking table test waveform use requirement.

公开(公告)号：US11873876B2

公开(公告)日：2024-01-16

申请号：US17896112

申请日：2022-08-26

Applicant: Beijing University of Technology

Inventor： Jinbao Ji ,  Weiqi Zhang ,  Sen Yang ,  Zongxiang Hu

IPC: F16M11/22 ,  F16F15/02

CPC classification number: F16F15/022 ,  F16M11/22 ,  F16F2222/08 ,  F16F2228/066 ,  F16F2232/08 ,  F16M2200/00

Abstract: A dynamic balance type vertical vibration isolator includes slide blocks, balance springs, mass blocks, a fixed block, rotation shafts, stiffness-adjustable springs, etc. When an earthquake force is upward, the stiffness-adjustable springs are compressed, upward forces of the stiffness-adjustable springs are increased, meanwhile, the slide blocks and the mass blocks move away from the fixed block, the balance springs are stretched to generate pull forces, and the pull forces have vertically upward components, so as to reduce compression degrees of the stiffness-adjustable springs, and further to reduce the upward forces of the stiffness-adjustable springs. Similarly, when the earthquake force is downward, the stiffness-adjustable springs are stretched, downward forces of the stiffness-adjustable springs are increased, meanwhile, the slide blocks and the mass blocks move close to the fixed block, the balance springs are compressed to generate compression forces, and the compression forces have vertical downward components.