Research on the health monitoring system of hoisti

Development of hoisting machinery health monitoring system based on optical fiber sensing technology

Introduction to "development of hoisting machinery health monitoring system based on optical fiber sensing technology", a key project of the national science and technology support plan for the Eleventh Five Year Plan

Structural Health monitoring can accurately and reliably evaluate the integrity of the monitored structure, reduce maintenance costs, increase working life and improve safety. It has been well applied in civil engineering. As a large and complex mechanical system, the structural safety performance of hoisting machinery directly affects the project quality and the safety of relevant personnel. In order to further improve the safety technology level and ensure work efficiency, it is necessary to carry out research on structural health monitoring

strain is one of the most important parameters in the detection of large lifting equipment. It reflects the inherent characteristics of engineering structures and is sensitive to local characteristic changes, especially local stress and local structural damage. The traditional strain gauge measurement can not meet the technical requirements of high-precision, long-distance and distributed detection of large lifting equipment. And its biggest disadvantage is that it can only measure the strain in a short time, and can not monitor the strain of metal structure in a long time

optical fiber sensor has become an application prospect. Accura HPC provides us with one of the core sensing elements with the best reliable results in aerodynamic testing. It has the advantages of small volume, light weight, embedment structure, reusability and no electromagnetic interference. Among all kinds of optical fiber sensors, fiber Bragg grating sensors can be used in long-term monitoring applications in harsh environments, and become the most promising substitute for electrical sensors

it is believed that the success of this project will greatly promote the safety technology level of the crane industry and develop new safety performance evaluation methods. The preliminary objectives and main contents of the current project are as follows:

(I) objective

through the research of fiber Bragg grating sensing technology, establish a large-scale lifting machinery health monitoring system to realize real-time monitoring of the structural health of lifting machinery The prediction of crane structural safety and the pre plasticization time itself is a fluctuating alarm, and can evaluate the structural safety status of lifting machinery, provide technical solutions for the application of fiber Bragg grating sensing technology to special equipment such as lifting machinery, and drive the improvement of special equipment health monitoring technology. The health monitoring technology provides the key parameters of the crane structure during the operation of the whole machine, and analyzes the safety evaluation and residual life of the crane structure; Timely capture the precursors of structural failure accidents of hoisting machinery, discover its potential safety hazards, and prevent sudden catastrophic accidents, so as to avoid major casualties and property losses

(II) main research content

develop a set of hoisting machinery health monitoring system based on Fiber Bragg grating sensing technology. Carry out research on Fiber Bragg grating group monitoring technology; Independent research and development of fiber Bragg grating demodulator, the core component of the monitoring system; Carry out research on structural safety prediction and early warning, safety evaluation and residual life evaluation of special equipment based on Fiber Bragg grating sensing technology, and formulate lifting machinery based on Fiber Bragg grating technology. 6. Fasteners of electro-hydraulic servo universal experimental machine should be locked regularly: the vibration after the specimen is broken will often make some fasteners loose. Technical standards for 2015 (2) and 2020 of the health monitoring system, It lays a good foundation for the wide application of fiber Bragg grating in health monitoring of large-scale special equipment in the future. Through the research of the above related technologies, the monitoring technology level of special equipment will be improved. Publish papers and carry out technical services to promote and apply research results

(III) main technical parameters and assessment indicators

develop a set of hoisting machinery health monitoring system based on Fiber Bragg grating sensing technology, and monitor the strain of multiple key points on the hoisting machinery structure at the same time, with a measurement accuracy of 1 με； The vibration of the lifting machinery during operation is monitored with a measurement accuracy of 50 UG and a frequency response range of Hz to evaluate the overall dynamic characteristics of the lifting machinery structure; Develop a four channel fiber Bragg grating demodulator, with a wavelength resolution of 1 pm, and the synchronous scanning frequency can be set between 1 ~ 50Hz to meet the monitoring requirements; It can predict and warn the abnormalities in the operation of lifting machinery; The mathematical models of structural safety evaluation and residual life of hoisting machinery are established. The system monitoring center can display the monitoring results in real time and remotely and control the on-site monitoring system; Formulate the technical standard of crane machinery health monitoring system based on Fiber Bragg grating technology