A new method is proposed to improve the accuracy of structural instantaneous frequency (IF) extraction. The proposed method combines a new form of improved generalized S-transform (IGST) and a multi-synchrosqueezing operation. The parameters selection of the window function in IGST is derived through the concentration measure (CM) principle. Then, the multi-synchrosqueezing algorithm is employed to improve energy aggregation of time-frequency analysis (TFA). To verify the effectiveness and accuracy of the proposed improved multi-synchrosqueezing generalized S-transform (IMSSGST), a frequency-modulated multi-component signal is investigated. For structural IF extraction, a two-story shear frame and a threestory steel frame structure are introduced. Furthermore, the IF identification of a seven-story RC shear wall structure is conducted to verified the practicability in actual engineering. Numerical simulation and experimental results show that the proposed method can effectively improve the energy aggregation of TFA and effectively improve the accuracy of IF identification.

Ping-Ping Yuan

Xue-Li Cheng

Hang-Hang Wang

Jian Zhang

Zhong-Xiang Shen

Wei-Xin Ren

Smart Structures and Systems

国际机电一体化、传感器、监测、控制、诊断和管理杂志旨在为智能结构和系统一般领域的研究人员提供主要的出版渠道。该期刊考虑的典型主题包括：传感器/执行器（材料/设备/信息学/网络）结构健康监测与控制诊断/预后生命周期工程（规划/设计/维护/更新）及相关领域。

Smart Structures and Systems is an international journal that focuses on mechatronics, sensors, monitoring, control, diagnostics, and management. It aims to provide a primary publishing platform for researchers in the field of smart structures and systems. Typical topics covered by the journal include: sensors and actuators (materials, devices, informatics, networks), structural health monitoring and control, diagnostics and prognostics, lifecycle engineering (planning, design, maintenance, updating), and related fields.

《Smart Structures and Systems》是一本国际性的期刊，专注于机电一体化、传感器、监测、控制、诊断和管理等领域，旨在为智能结构和系统的研究人员提供一个主要的出版平台。期刊涵盖的典型主题包括：传感器和执行器（材料、设备、信息学、网络）、结构健康监测与控制、诊断与预后、生命周期工程（规划、设计、维护、更新）及相关领域。

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Structural instantaneous frequency extraction based on improved multi-synchrosqueezing generalized S-transform

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