Fluctuating wall cylinder experimental device

Abstract

The invention discloses a moving wavy wall cylinder experimental apparatus comprising a cylinder, a power mechanism, a transmission mechanism, and a fluctuation mechanism. The power mechanism s disposed on the top of the cylinder. The transmission mechanism is vertically disposed inside the cylinder. The output end of the power mechanism is joined to the top of the transmission mechanism. The fluctuation mechanism arranged coaxial with the transmission mechanism is disposed inside the cylinder and is composed of two top fluctuation wheels, two bottom fluctuation wheels, a top transmission shaft, a bottom transmission shaft, multiple push rods, multiple fluctuation rods, and an elastic covering sheath. The top transmission shaft and the bottom transmission shaft are vertically disposed inside the cylinder. The outer contour lines of the top fluctuation wheels or the bottom fluctuation wheels are enclosed annular curves formed by peaks and valleys of continuous waveforms. The multiple push rods respectively pass through a corresponding push rod guiding hole on the wall of the cylinder. The multiple fluctuation rods are fixedly connected with the inner side surface of the elastic covering sheath. The moving wavy wall cylinder experimental apparatus achieves a purpose of simulating wave movement with the simple transmission mechanism and has low cost and steady and reliable operation.

Description

technical field [0001] The invention relates to an experimental device for studying the flow around a dynamic wave wall cylinder to obtain the suppression effect of the wave wall on vortex-induced vibration and resistance, and belongs to the technical field of inland river and ocean engineering simulation experiments. Background technique [0002] In inland river and marine engineering, there are many underwater cylindrical structures, such as offshore platform pillars, pier foundation columns, bridge piers, etc. The environmental loads on these underwater columns mainly include wind, wave, current, ice and seismic loads, etc. Among them, waves and water flow are the most important loads. At a certain flow rate, periodic vortex shedding will occur in the wake of the column. Especially when the natural frequency of the column is close to the frequency of vortex shedding, vortex induced resonance occurs. It will cause fatigue damage to the column, seriously affect the service...

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Problems solved by technology

[0002] In inland river and marine engineering, there are many underwater cylindrical structures, such as offshore platform pillars, pier foundation columns, bridge piers, etc. The environmental loads on these underwater columns mainly include wind, wave, current, ice and seismic loads, etc. Among them, waves and water flow are the most important loads. At a certain flow rate, periodic vortex shedding will occur in the wake of the column. Especially when the natural frequency of the column is close to the frequency of vortex shedding, vortex induced resonance occurs. Cause fatigue damage to the column, seriously affect the service life and performance of the column, and even cause serious engineering and environmental accidents

[0003] At present, the influence of moving wave wall cylinder on vortex-induced vibration and resistance is still in the stage of theoretical research, and there is no experimental verification. A moving wave wall that can accurately simulate wave motion, adjust different parameters, and verify numerical simulation results is needed. The cylinder experimental device provides guidance and basis for practical engineering applications

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