针对抛物面槽式太阳能集热器振动特性研究需求,基于结构动力学运动微分方程推导振型参与系数及累积有效质量参与比的理论表达式,并在有限元模态计算中依据累积有效质量参与比达90%的模态截断准则确定模态提取阶数,求解不同俯仰角下的计算模态参数,同时开展集热器原型现场模态试验,获取多工况下的试验模态参数。结果分析表明：提取前15阶模态时,累积有效质量参与比达91.20%,符合工程规范要求;试验与仿真对应阶次的振型形态高度相似,固有频率最大相对误差为3.86%,有效验证了有限元模型的适用性。
Abstract
To address the research demand for the vibration characteristics of parabolic trough solar collectors, the theoretical expressions for modal participation factors and cumulative effective mass participation ratios are derived based on the differential equations of motion in structural dynamics. In finite element modal analysis, the modal truncation criterion requiring the cumulative effective mass participation ratio to reach 90% is adopted to determine the number of modes to extract, and computational modal parameters under different pitch angles are obtained. Concurrently, field modal tests are conducted on a parabolic trough solar collector prototype to obtain experimental modal parameters under multiple operating conditions. The results show that extracting the first 15 modes yields a cumulative effective mass participation ratio of 91.20%, which satisfies the engineering requirement for dynamic analysis. The corresponding mode shapes from tests and simulations are highly consistent, with a maximum relative error of 3.86% for natural frequencies, thus effectively validating the applicability of the established finite element model.
关键词
太阳能集热器 /
振动测量 /
网格无关性分析 /
固有频率 /
模态振型 /
振型参与系数
Key words
solar collectors /
vibration measurement /
mesh independence analysis /
natural frequencies /
modal mode shape /
modal participation factor
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