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The force of diamond circular saw blade is complex,and it will produce strong transverse vibration,which is harmful to the operator’s health,the service life of the circular saw blade and the precision of the workpiece.In order to meet the new requirements of national cleaner production,it is urgent to formulate strategies to reduce vibration and noise.In this paper,the cutting force model of circular saw blades with different slot width was studied by combining theoretical analysis,model simulation and experimental verification.Based on the finite element method（FEM）,the influences of the width,depth and distribution of the slots on the dynamic characteristics of the diamond circular saw blade were studied.The particle swarm optimization（PSO）algorithm was applied to the structure optimization of the diamond circular saw blade slots,and the optimal structure of the circular saw blade slot was obtained iteratively.The vibration and acoustic radiation characteristics of the diamond circular saw blades before and after the optimization were analyzed,and the vibration and noise mechanism of the diamond circular saw blades after the optimization of the slot structure was studied.The research content includes:The matrix structure,motion form and undeformed sawdust thickness of conventional circular saw blades and variable slot circular saw blades were compared.The sawing force model of diamond circular saw blade was established by introducing the parameters of slot width.The models of sawing force,segments frequency and slot frequency of the circular saw blade with variable slot were established.The vibration reduction mechanism of diamond circular saw blade with variable slot was analyzed.The accuracy of the sawing force model was verified by the force measurement experiment of sawing granite with circular saw blade,and the data collected provided data support for subsequent dynamic simulation.Based on the force measurement experiment of circular saw blade sawing granite,the diamond circular saw blade model of control group and the diamond circular saw blade model with different width,depth and distribution of slot were established.The influence of these variables on the dynamic characteristics of diamond circular saw blade was studied by using the finite element method.The PSO algorithm was applied to the structure optimization of diamond circular saw blade slots,and the structural parameters of circular saw blade slots were optimized based on MATLAB.The vibration and acoustic radiation characteristics of the diamond circular saw blade structure before and after optimization were analyzed based on FEM.Through modal analysis and acoustic modal analysis of the circular saw blade in natural frequency of the first 20 order,it can be obtained that the maximum deformation reduction value appears at the 20th order.Through harmonic response analysis and acoustic analysis,it can be concluded that the maximum amplitude of the optimized diamond circular saw blade can be reduced by 0.2mm,and the sound pressure level can be reduced by about 8dB at 6100Hz.In this paper,PSO algorithm was used to iteratively optimize the slots structure parameters of diamond circular saw blades,and the vibration and acoustic radiation characteristics of the optimized diamond circular saw blades were analyzed,which provided a design basis for the vibration and noise reduction design of green high-performance diamond circular saw blades,and also provides a production basis for the processing of enterprises.