Research on Dynamic Characteristics of Integrated Drivetrain for Large Wind Turbines

doi:10.3901/JME.2025.11.106

Abstract

Abstract: Addressing the challenges of dynamic characteristic analysis due to the compact structure and strong coupling features of the "mainshaft-gearbox-generator" trinity integrated drivetrain in large wind turbines, this study focuses on a certain 12 MW integrated wind turbine drivetrain. It comprehensively considers the parameters of the generator's stator and rotor systems, its assembly methods and electromagnetic excitations to establish a multi-degree-of-freedom refined rigid-flexible coupling model that accounts for the integration of the main shaft, gearbox, and generator. A Masta-Simpack static-dynamic modification transformation method suitable for gearbox dynamics analysis is proposed, enhancing the simulation model's compatibility with the actual dynamic performance of the gearbox. A vibration response risk assessment method based on potential torsional mode with multi-criteria screening is proposed, followed by time-frequency domain response and sweep frequency order analysis of the drivetrain. To validate the theoretical analysis results, a 24 MW pair-tow test rig bench is established, on which the dynamic performance loading experiments are carried out. It can be seen from the comprehensive simulation and experimental results that when the high-speed output shaft speed reaches 608 r·min^-1, there is a torsional vibration risk in the carrier of the third stage with a torsional vibration signal amplified by about 3.5 times. Besides, the response from some gearbox vibration measurement points can identify the torsional vibration risk, verifying the high fidelity of the proposed refined dynamic modeling method. The resonance risk assessment method based on vibration amplification factor fully resolves the issue that measurement point responses cannot accurately reflect the internal component’s vibration conditions. The research findings are of significant guiding importance for improving the dynamic performance and reliability of integrated drivetrain for large wind turbines.

Key words: integrated drivetrain, gear modification, modal evaluation, vibration response, dynamic characteristics

CLC Number:

TK412

SUN Yizhong, ZHU Caichao, TAO Lizhuang, XIONG Yongqiang, CHANG Tao. Research on Dynamic Characteristics of Integrated Drivetrain for Large Wind Turbines[J]. Journal of Mechanical Engineering, 2025, 61(11): 106-118.

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