[ China Instrument Network Instrument Development ] Recently, Jiangsu Xuzhou Comprehensive Inspection and Testing Center (National Grid and Steel Structure Quality Inspection Center) completed the Jiangsu Provincial Quality and Technical Supervision Bureau Science and Technology Project "Space-based grid internal force detection technology based on natural frequency Research" (project number: KJ168342), and successfully passed the acceptance.
Xuzhou Comprehensive Inspection and Testing Center is a national-level product quality inspection institution approved by the State Administration of Quality Supervision, Inspection and Quarantine and certified by the National Certification and Accreditation Administration. It is a statutory quality supervision and inspection institution with a third-party impartial status. Sexual non-profit institutions. Since its establishment, the Center has been committed to the research and standard research of steel structure quality inspection technology.
According to the plan, Xuzhou Comprehensive Inspection and Testing Center will build a 100-mu comprehensive test site for engineering machinery, as well as an electromagnetic compatibility laboratory, a large-scale temperature and humidity laboratory, an environmental performance laboratory, a light distribution laboratory, and a metal material testing laboratory. 10,000 square meters of professional laboratories, built a domestic first-class engineering machinery product inspection and research and development institutions, providing quality testing, quality certification, type testing, standard development, technology research and development, technical evaluation and other "one-stop" comprehensive technical services.
The "Research on the Internal Force Detection Technology of Spatial Grid Structure Based on Self-vibration Frequency" is a series of researches carried out by Xuzhou Comprehensive Inspection and Testing Center on the relationship between axial force and natural frequency of truss structure members.
At present, Xuzhou Inspection and Testing Center has achieved four results: First, based on the vibration displacement expression and boundary conditions of the member, the theoretical relationship between the axial force of the member under arbitrary elastic constraints and the natural frequency of each step is derived. Secondly, based on the multi-frequency fitting optimization algorithm, the MATLAB optimization calculation program corresponding to the relationship between the axial force of the rod and the natural frequency of each order is compiled. The third is to complete the axial force and boundary stiffness test of the actual loaded members under arbitrary boundary conditions of various bearing simulation members, and compare with the calculation of axial force and boundary conditions based on the self-vibration frequency of each order. The results show that the error is allowed in the project. Within the scope. The fourth is to complete the grid model based on the self-vibration frequency of each order to derive the axial force test, which is in good agreement with the strain gauge test results. This method can be used as a practical reference for engineering.
The successful acceptance of "internal force detection technology based on self-vibration frequency spatial grid structure" not only helps to reduce the hidden dangers of engineering quality, but also guarantees the quality of national key projects, large venues, high-rise buildings and other steel structure projects, and effectively safeguards national property and people. Life safety is also conducive to promoting the development of national standards, promotion and application of new technologies, and establishment of improved grid and steel structure quality and safety testing systems.
(Original title: China Quality News Network, Wireless Xuzhou, Baidu Encyclopedia)
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