Abstract Time-frequency analysis technique is an effective analysis tool for non-stationary processes. In the field of reactor neutron noise, the time-frequency analysis method has not been thoroughly researched and widely used. This work has studied the time-frequency analysis of the reactor neutron noise experimental signals under bubble disturbance and control rod vibration. First, an experimental platform was established, and it could be employed to reactor neutron noise experiment and data acquisition. Secondly, two types of reactor neutron noise experiments were performed, and valid experimental data was obtained. Finally, time-frequency analysis was conducted on the experimental data, and effective analysis results were obtained in the low-frequency part. Through this work, it can be concluded that the time-frequency analysis technique can effectively investigate the core dynamics behavior and deepen the identification of the unstable core process.

中文翻译：

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气泡扰动和控制棒振动下反应堆中子噪声的时频分析

摘要 时频分析技术是一种有效的非平稳过程分析工具。在反应堆中子噪声领域，时频分析方法尚未得到深入研究和广泛应用。本文研究了气泡扰动和控制棒振动下反应堆中子噪声实验信号的时频分析。首先，搭建了实验平台，可用于反应堆中子噪声实验和数据采集。其次，进行了两类反应堆中子噪声实验，获得了有效的实验数据。最后对实验数据进行时频分析，在低频部分得到了有效的分析结果。通过这项工作，