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tilt adjustment for a portable absolute atomic gravimeter

Chinese Physics B 2020年第7期29卷 295-299页

作者： Hong-Tai Xie Bin Chen Jin-Bao Long Chun Xue Luo-Kan Chen Shuai Chen Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaShanghai 201315China Shanghai Research Center for Quantum Sciences Shanghai 201315China Shanghai Division QuantumCTek Co.Ltd.Shanghai 201315China

For an atomic gravimeter,the measured value of the Earth’s gravity acceleration g is the projection of the local gravity on the direction of Raman laser *** accurately measure the g,the Raman laser beams should be parallel to the g *** analyze the tilt effect of the Raman beams on g measurement and present a general method for the tilt *** systematic error caused by the tilt angle is evaluated as 0(+0,0.8)µGal(1µGal=10 nm/s^2)and the drift is also compensated in real *** method is especially suitable for the portable atomic gravimeter which focuses on the mobility and field applications.

关键词： atomic gravimeter systematic error tilt adjustment stability

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Experimental Study on tilt adjustment Technique of Tripod Bucket Jacket Foundation for Offshore Wind Turbine in Sand

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Journal of Marine Science and Application 2022年第4期21卷 192-204页

作者： Puyang Zhang Yuxuan Ma Conghuan Le Hongyan Ding State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

For the tripod bucket jacket foundations used in offshore wind turbines, the probable critical tilt angles should be avoidedduring tilt adjustment operation. Thus, these critical values must be identified by engineers, and remedial techniques mustbe established prior to the occurrence of the problem. Model tests were carried out for typical tilting conditions of tripodbucket foundations, which were allowed to tilt freely at various penetration depths without interruption by manualoperation. After the foundation ceased its tilting, some measures, such as water pumping, water injection, air injection, or acombination of the above methods, were enabled for adjustment. The research results showed two critical values in thetilting state of the tripod bucket jacket foundation, namely the terminal and allowable angles. In the installation condition,the terminal angle was negatively correlated with the initial penetration depth, but the opposite was observed with theremoval condition. The allowable angle was less than or equal to the terminal angle. The allowable angle in the installationwas related to the terminal angle. The critical angles all varied linearly with the initial penetration depth. When tiltingduring installation, adjustment measures can be used in the order of high drum pumping, low drum water injection, highdrum pumping and low drum water injection, air injection, and exhaust. When tilting during removal, the sequential use oflow drum water injection, air, and exhaust was applied. For buckets that were sensitive to angle changes, adjustmentmeasures of the “point injection” mode can be selected.

关键词： Tripod bucket jacket foundation tilt adjustment Penetration and removal Terminal angle Allowable angle Offshore wind turbine

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