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<p>This paper presents a comprehensive experimental and numerical investigation into the dynamic characteristics of the foundation for a 630°C ultra-supercritical double-reheat 1000 MW turbine-generator, whose 74 m longitudinal footprint is the longest to date. A 1:10 scale model was fabricated to capture equipment-loaded scenarios; multi-input, multi-output modal tests and electrodynamic shaker-based forced vibration tests were conducted to determine natural frequencies, mode shapes, and damping ratios. Results were cross-validated against a high-fidelity ABAQUS model incorporating solid C3D8R elements for concrete and truss T3D2 elements for reinforcement. The first global translational mode was experimentally identified at 16.45 Hz, deviating by only −1.85% from the numerical prediction, whereas higher-order modes exhibited deviations within ±6%. Subsequent steady-state dynamic analyses, calibrated with experimental damping, predicted full-scale displacement responses under operational unbalance loads. All calculated amplitudes lie below the vibration limits prescribed in GB 50040, confirming that the prototype foundation satisfies stringent vibration-control criteria for ultra-supercritical units. The integrated experimental-numerical framework offers a transferable methodology for future ultra-long turbine-generator foundations where code provisions are absent.</p>

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Dynamic Characteristic Study of the Foundation Model for a 630°C Ultra-Supercritical Double Reheat Turbine-Generator

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • B. Yang,
  • X. H. Sun,
  • S. J. Chen,
  • C. Xia

摘要

This paper presents a comprehensive experimental and numerical investigation into the dynamic characteristics of the foundation for a 630°C ultra-supercritical double-reheat 1000 MW turbine-generator, whose 74 m longitudinal footprint is the longest to date. A 1:10 scale model was fabricated to capture equipment-loaded scenarios; multi-input, multi-output modal tests and electrodynamic shaker-based forced vibration tests were conducted to determine natural frequencies, mode shapes, and damping ratios. Results were cross-validated against a high-fidelity ABAQUS model incorporating solid C3D8R elements for concrete and truss T3D2 elements for reinforcement. The first global translational mode was experimentally identified at 16.45 Hz, deviating by only −1.85% from the numerical prediction, whereas higher-order modes exhibited deviations within ±6%. Subsequent steady-state dynamic analyses, calibrated with experimental damping, predicted full-scale displacement responses under operational unbalance loads. All calculated amplitudes lie below the vibration limits prescribed in GB 50040, confirming that the prototype foundation satisfies stringent vibration-control criteria for ultra-supercritical units. The integrated experimental-numerical framework offers a transferable methodology for future ultra-long turbine-generator foundations where code provisions are absent.