China Instrument Network Instrument Development recently, the Xuzhou Comprehensive Inspection and Testing Center (National Grid and Steel Structure Quality Inspection Center) successfully completed and passed the acceptance of the Jiangsu Provincial Quality and Technical Supervision Bureau Science and Technology Project titled "Research on Space-based Grid Internal Force Detection Technology Based on Natural Frequency" (Project Number: KJ168342).
The Xuzhou Comprehensive Inspection and Testing Center is a nationally recognized quality inspection institution approved by the State Administration of Market Regulation and certified by the National Certification and Accreditation Administration. As an independent third-party organization, it plays a crucial role in statutory quality supervision and testing. Since its establishment, the center has focused on researching and developing standards for steel structure quality inspection technology.
According to the development plan, the center will build a 100-mu comprehensive test site for engineering machinery, along with specialized laboratories such as electromagnetic compatibility, large-scale temperature and humidity, environmental performance, light distribution, and metal material testing. These facilities will cover over 10,000 square meters, establishing one of the top-tier engineering machinery product inspection and R&D institutions in China. It offers a full range of services including quality testing, certification, type testing, standard development, technology research, and technical evaluation.
The project "Research on Internal Force Detection Technology of Spatial Grid Structures Based on Self-vibration Frequency" focuses on exploring the relationship between axial force and natural frequency in truss structures. This research aims to provide a more accurate and efficient method for internal force detection in spatial grid structures.
To date, the Xuzhou Inspection and Testing Center has achieved four key outcomes. First, they derived the theoretical relationship between the axial force of structural members under arbitrary elastic constraints and their natural frequencies. Second, they developed a MATLAB optimization program based on multi-frequency fitting algorithms to calculate axial forces from natural frequencies. Third, they conducted practical tests on loaded members under various boundary conditions, comparing results with those calculated using self-vibration frequency data. The error was within acceptable limits for engineering applications. Finally, they validated the method by building a grid model based on self-vibration frequency data, which showed good agreement with strain gauge measurements. This approach can serve as a valuable reference in real-world engineering projects.
The successful completion of this project not only helps reduce hidden risks in engineering quality but also ensures the safety and quality of national key projects, large venues, and high-rise buildings. It contributes to protecting national property and public life safety. Additionally, it supports the development of national standards, the promotion of new technologies, and the improvement of grid and steel structure quality and safety testing systems.
(Original title: China Quality News Network, Wireless Xuzhou, Baidu Encyclopedia)
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