Agricultural harvesting machine , in particular combine harvester, with a cutting mechanism designed as a harvesting attachment for cutting and picking up crop material, at least comprising - a cutting table which is assigned to the cutting mechanism and can be adjusted in its cutting table length , - a reel which is assigned to the cutting mechanism and can be adjusted in a reel vertical position and reel longitudinal position , - an inclined conveyor which is arranged downstream of the cutting mechanism and upstream of a threshing mechanism of the harvesting machine , - a driver assistance system for controlling the cutting mechanism , the driver assistance system comprising a memory for storing data and a computing device for processing the data stored in the memory , the computing device being set up to autonomously determine at least one machine parameter by means of at least one input variable and to preset it for the cutting mechanism , it being possible for the machine parameters to comprise the cutting table length and/or the reel vertical position and/or the reel longitudinal position , characterised in that means are provided which determine a crop throughput and a coefficient of vibration describing the fluctuation of the crop throughput in a region lying in front of the threshing unit , and in that the driver assistance system is set up to adapt the cutting table length from the determined vibration coefficient , the frequency components being separated by means of the computing device into a steady share and a vibration share , the coefficient of vibration being determined by means of the vibration share , and the crop throughput being determined by means of the steady share . - a cutting table which is assigned to the cutting mechanism and can be adjusted in its cutting table length , - a reel which is assigned to the cutting mechanism and can be adjusted in a reel vertical position and reel longitudinal position , - an inclined conveyor which is arranged downstream of the cutting mechanism and upstream of a threshing mechanism of the harvesting machine , - a driver assistance system for controlling the cutting mechanism , the driver assistance system comprising a memory for storing data and a computing device for processing the data stored in the memory , the computing device being set up to autonomously determine at least one machine parameter by means of at least one input variable and to preset it for the cutting mechanism , it being possible for the machine parameters to comprise the cutting table length and/or the reel vertical position and/or the reel longitudinal position , characterised in that means are provided which determine a crop throughput and a coefficient of vibration describing the fluctuation of the crop throughput in a region lying in front of the threshing unit , and in that the driver assistance system is set up to adapt the cutting table length from the determined vibration coefficient , the frequency components being separated by means of the computing device into a steady share and a vibration share , the coefficient of vibration being determined by means of the vibration share , and the crop throughput being determined by means of the steady share . <EOS>