Abstract : This paper focuses on the online monitoring and evaluation of tippler machines. It studies fiber optic grating (Fiber Bragg grating) sensing technology and uses Fiber Bragg grating sensors to detect the Bragg wavelengths of the reflected or transmitted spectra of the gratings written within the optical fiber, thereby measuring the strain and temperature of the tippler structure. Simultaneously, based on the tippler's structure and the stress state of its main components, a layout and wiring scheme for the Fiber Bragg grating sensors is proposed. Data acquisition is performed using Fiber Bragg grating strain sensors, optical cables, a Fiber Bragg grating wavelength demodulator, and a computer. A processing flow, evaluation rules, and reasoning methods are designed to establish a tippler monitoring and evaluation system. This system solves the previous problems of long-term reliable monitoring of the structural stress state, real-time dynamic data acquisition, and accurate fault location in tipplers. It has been successfully applied to the condition monitoring of tipplers in ports, demonstrating its significant research value in improving tippler monitoring capabilities. Keywords : Tippler; Fiber Bragg grating sensing; Online monitoring Introduction Tipping machines are large-scale production machines used in ports, factories, mines, and enterprises to unload bulk cargo transported by train by tilting the cargo into individual wagons, achieving automated bulk cargo transportation. Their health directly affects unloading efficiency. Due to limitations in testing technology, previous methods primarily relied on resistance strain gauges, vibrating wire sensors, and electromagnetic testing techniques, which struggled to achieve long-term reliable monitoring of the tipper structure's stress condition, real-time dynamic data acquisition, and accurate fault location. Fiber Bragg grating (FBG) sensors, as a novel type of fiber optic sensor, possess excellent characteristics such as fiber compatibility, electromagnetic interference resistance, corrosion resistance, small size, and ease of multiplexing, making them a research hotspot in next-generation intelligent sensing technology. A stress-strain testing system based on the Bragg fiber grating sensing mechanism and multi-channel demodulation technology provides a new approach for online stress monitoring of tipper metal structures. [Full text download of the design of a tipper monitoring and evaluation system based on fiber grating sensing]