Test device and method for vertical initial motional impedance of bucket foundation

Abstract

The invention discloses a test device and method for the vertical initial motional impedance of a bucket foundation. The test device comprises the bucket foundation, a fan tower, a mass block, an extension thrust rod, a low-frequency electromagnetic exciter, an exciter fixing rack, a force sensor, a flange connecting disc, a soil pressure sensor, pore water pressure sensors, acceleration sensors, strain pieces, an energy-dissipation material, water drain pipes, a test iron box, steel angle ribs, steel plate reinforcing ribs, a loading frame, a power amplifier, a swept signal generator, a dynamic acquisition instrument and a computer. The test device is composed of a load loading part and a bucket foundation part, so that the vertical motional rigidity and the vertical motional impedance are measured. The low-frequency exciter is utilized for loading, and the motional rigidity of the bucket foundation is obtained by measuring the action force and displacement of a soil body. The motional impedance of the bucket foundation is obtained by applying vertical initial displacement to the mass block and measuring an attenuation curve. By adoption of the test device and method for the vertical initial motional impedance of the bucket foundation, the vertical initial motional impedance and influence factors of the bucket foundation can be accurately studied, and a basis is provided for further studying.

Description

technical field [0001] The invention belongs to the technical field of offshore wind turbine power generation, and in particular relates to a bucket foundation vertical initial dynamic impedance test device and test method. Background technique [0002] With the reduction of non-renewable energy sources such as coal and oil, and the increasingly prominent environmental problems caused by the use of fossil energy, many countries have begun to actively explore and develop renewable energy sources. As a representative of renewable energy, offshore wind energy has become the research focus of new energy development because of its characteristics of saving land resources, stable wind energy, no noise, and no pollution. [0003] The ultra-large-diameter thin-walled barrel foundation of offshore wind turbines generally refers to a barrel whose diameter is much larger than that of common pile foundations and suction anchor foundations, with a diameter of tens of meters (the maximum ...

AI Technical Summary

Problems solved by technology

Some scholars have studied the natural vibration frequency and system damping of bucket foundation fans under cyclic loads. However, in order to accurately obtain the bucket foundation dynamic impedance, it is still necessary to study the generation mechanism and influencing factors of the bucket foundation dynamic impedance.

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