Device for testing vortex-excited oscillation and rotation of vertical riser pipe under uniform flow and stepped uniform flow

The invention relates to a device for testing vortex-excited oscillation and rotation of a vertical riser pipe under a uniform flow and a stepped uniform flow, belonging to the technical field of ocean engineering. The device comprises a riser pipe model mechanism, a measurement and analysis system platform module, a driving module, a top cantilever module, a bottom cantilever module, a cylindrical shaft segmentation module and a bottom support module, wherein the riser pipe model mechanism is fixedly arranged between the bottom cantilever module and the top cantilever module; the cylindricalshaft segmentation module is perpendicularly arranged in a deep ocean engineering pool and is respectively and perpendicularly connected with the bottom support module, the driving module and the topcantilever module; the bottom support module is fixedly arranged on a lifting bottom; the driving module is respectively connected with the cylindrical shaft segmentation module and the top cantilever module; the left end and the right end of the top cantilever module are respectively connected with the cylindrical shaft segmentation module; and the measurement and analysis system platform moduleis respectively connected with a riser pipe model, the top cantilever module and the bottom cantilever module. By using the invention, the uniform or stepped flow field of a riser pipe with an actualsize can be simulated.