MỘT SỐ PHƯƠNG PHÁP NHẬN DẠNG ĐẶC TRƯNG ĐỘNG THEO THỜI GIAN THỰC THƯỜNG DÙNG HIỆN NAY ĐỐI VỚI KẾT CẤU CÔNG TRÌNH TRÊN BIỂN=APPLICATIONS OF COMMON REAL-TIME IDENTIFICATION OF DYNAMIC CHARACTERISTICS FOR OFFSHORE STRUCTURES

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Tác giả: Công Bình Đào, Hồng Quang Nguyễn, Thành Trung Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2024

Mô tả vật lý: tr.7

Bộ sưu tập: Metadata

ID: 251778

Thêm vào giỏ

The dynamic behavior of offshore structures becomes complex due to the effect of the combination of marine environmental and operational conditions. There are some damages and failures that need to be detected early to establish a suitable maintenance strategy. Therefore, the online structural health monitoring (SHM) system has been investigated and developed continuously to ensure safety performance by timely warning. The SHM requires a suitable real-time identification of dynamic characteristics of offshore jacket structure. This article presents a discussion of the advantages, disadvantages, and development trends of existing real-time identification systems and techniques commonly applied to offshore jacket structures. The main identifications in the real-time domain methods including the Short-Time Fourier Transform (STFT), Wavelet Transform (WT) and Hilbert Huang transform (HHT) techniques in predicting dynamic characteristics were also discussed and evaluated. Meanwhile, HHT is the most suitable identification method for real-time identification methods in SHM of offshore jacket structures.Ứng xử động lực học của kết cấu công trình trên biển trở nên phức tạp do chịu ảnh hưởng đồng thời của các điều kiện môi trường biển và điều kiện sử dụng. Một số hư hỏng và phá hoại của chúng cần được phát hiện sớm để có thể xây dựng các kế hoạch bảo dưỡng phù hợp. Vì vậy, hệ thống giám sát sức khỏe kết cấu trực tuyến (SHM) đã và đang được nghiên cứu và phát triển liên tục để đảm bảo an toàn khai thác thông qua các cảnh báo kịp thời. SHM phải đòi hỏi sự nhận dạng các đặc trưng động lực học của kết cấu công trình theo thời gian thực. Bài báo trình bày về ưu, nhược điểm cũng như xu hướng phát triển của một số hệ thống và kỹ thuật nhận dạng theo thời gian thực thường dùng hiện nay. Các phương pháp nhận dạng chính trong dự đoán các đặc trưng động học bao gồm tần số dao động riêng, tỉ số cản và dạng dao động. Phương pháp đo đạc phản ứng dao động và kỹ thuật xử lý tín hiệu cũng được thảo luận và đánh giá. Mục đích của nghiên cứu là giúp kỹ sư và chuyên gia có cái nhìn toàn diện và chi tiết về các phương pháp nhận dạng theo thời gian thực của hệ thống SHM đối với kết cấu công trình trên biển...

1. Đọc trực tuyến

1. Đọc trực tuyến

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