New results of inspection technology for grid and steel structure quality inspection center

China Instrument Network Instrument Development Recently, the Xuzhou Comprehensive Inspection and Testing Center in Jiangsu Province, which is also known as the National Grid and Steel Structure Quality Inspection Center, successfully completed and passed the acceptance of the science and technology project titled "Research on Space-based Grid Internal Force Detection Technology Based on Natural Frequency," funded by the Jiangsu Provincial Bureau of Quality and Technical Supervision (Project Number: KJ168342).

As a nationally recognized product quality inspection institution, the Xuzhou Comprehensive Inspection and Testing Center is authorized by the State Administration for Market Regulation and certified by the National Certification and Accreditation Administration. It operates as an independent third-party entity, dedicated to impartial quality supervision and inspection. Since its establishment, the center has focused on research and standard development related to steel structure quality testing.

According to the development plan, the center is building 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 and establish one of the top-tier engineering machinery product inspection and R&D centers in China. The center offers a wide range of services, including quality testing, certification, type testing, standard development, technology research, and technical evaluation—providing a “one-stop” solution for industry needs.

The project "Research on Internal Force Detection Technology of Spatial Grid Structures Based on Self-vibration Frequency" focuses on studying the relationship between axial force and natural frequency in truss structures. This research aims to improve the accuracy and efficiency of internal force detection in complex grid structures.

To date, the center has achieved four key outcomes: First, it derived the theoretical relationship between axial force and natural frequency under arbitrary elastic constraints using vibration displacement expressions and boundary conditions. Second, it developed a MATLAB optimization program that maps axial force to each natural frequency. Third, it conducted tests on actual loaded members under various boundary conditions, comparing results with calculations based on self-vibration frequencies, showing acceptable error margins. Fourth, it validated the method through grid model analysis, achieving good agreement with strain gauge measurements. This approach can serve as a practical reference for real-world engineering applications.

The successful completion of this project not only helps reduce potential risks in engineering quality but also ensures the safety and quality of national key projects, large venues, and high-rise buildings. It plays a vital role in 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)