The placement of a Stockbridge damper within a powerline conductor is critical for its effectiveness in mitigating aeolian vibrations. This paper investigates the optimal positioning of Stockbridge dampers under varying operating conditions using the finite element method (FEM), incorporating both modal and harmonic response analyses. We compare the performance of two commercially available Stockbridge dampers, symmetrical and asymmetrical models, using FEM to obtain the normalized optimal placement for both dampers on the conductor. The results show that the asymmetrical damper, when placed at its optimal location, provides superior vibration suppression compared to the symmetrical model at its optimal location and both dampers when placed at conventional positions. In a novel approach, an experimental investigation is conducted on the commercial asymmetrical damper to refine its finite element model and determine its optimized placement. The experimental study employs both burst random and sine-sweep tests, with the burst random test proving to be more accurate and consistent in identifying the damper’s natural frequencies and mode shapes. This study is the first to demonstrate the effectiveness of the burst random test in the context of Stockbridge dampers. Finally, we use the experimentally validated finite element model to determine the optimized placement of the asymmetrical damper on a real-life powerline conductor, achieving significantly improved vibration mitigation. These findings offer valuable insights for improving the performance and longevity of powerline systems.

中文翻译：

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Stockbridge 减振器在不同运行条件下的位置优化：全面的有限元和实验分析


在电力线导体内放置 Stockbridge 阻尼器对于其有效减轻风沙振动至关重要。本文使用有限元方法 （FEM） 研究了 Stockbridge 阻尼器在不同工作条件下的最佳定位，并结合了模态和谐波响应分析。我们比较了两种市售的 Stockbridge 阻尼器（对称和非对称模型）的性能，使用 FEM 获得两个阻尼器在导体上的标准化最佳放置。结果表明，与对称模型放置在最佳位置时相比，不对称阻尼器在其最佳位置提供了出色的振动抑制，而当放置在常规位置时，两个阻尼器都提供了卓越的抑制。在一种新颖的方法中，对商用非对称阻尼器进行了实验研究，以改进其有限元模型并确定其优化放置。该实验研究采用突发随机和正弦扫描测试，事实证明，突发随机测试在识别阻尼器的固有频率和振型方面更加准确和一致。这项研究首次证明了在 Stockbridge 阻尼器背景下爆发随机测试的有效性。最后，我们使用经过实验验证的有限元模型来确定不对称阻尼器在实际电力线导体上的优化位置，从而显着改善了减振效果。这些发现为提高电力线系统的性能和使用寿命提供了有价值的见解。