The Three-Dimensional Transmission Characteristics Of The Vibration Of The Spatially Different-Surface Staggered Drum And The Development Of The Online Dynamic Balance System

Before the combine harvester threshing drum is assembled to the whole machine,the dynamic balance correction needs to be carried out on the dynamic balancing machine,but due to assembly errors,multi-rotor(such as belt pulley,etc.)series unbalance superimposition,and the gear rod damage during the threshing process,it has been corrected.The threshing drum may still vibrate strongly during operation after being assembled to the whole machine.The large-feeding combine harvester has multiple threshing drums,and presents a structure with different faces in space.The vibration is coupled with each other through transmission.The vibration condition of the single rotor is different from the traditional on-site dynamic balance.The existing on-site dynamics balance technology is difficult to adapt to the three-dimensional transfer characteristics of the spatially different interlaced structure of the threshing system of the large-feeding combine harvester.Taking the layout of the drums of the combine harvester with a large feed volume(feeding volume ≥10kg/s)as a reference,a test bed for the staggered drums with different surfaces in space has been established.Based on the test bench,the dynamic balance test of the tandem rotating parts,the vibration transmission characteristic test and the vibration test of the drum-transmission system under the influence of unbalanced mass are carried out.Through the on-site dynamic balance test of the threshing drum assembled on the whole machine,the influence of the unbalanced amount of the transmission part and the assembly error on the vibration response and the influence of the unbalanced distribution on the shaft on the unbalanced response under random assembly are explored.The three-dimensional transmission characteristics of the interlaced drums with different surfaces in space are studied,and the transmission of vibration from the point of failure to the vibration detection point is explored.Regarding the drum and the transmission part as a whole,explore the impact of the vibration response and unbalanced mass of the drum transmission system on the drum-transmission system under different transmission types.Use LabVIEW as the software development platform to program key dynamic balance algorithms.Based on the classic cross-correlation algorithm,an adaptive multiple filter algorithm is proposed to adapt to the complex test environment of on-site dynamic balance.Multiple filtering and full cycle truncation procedures are used to ensure The accuracy of the cross-correlation analysis,the dynamic balance measurement model is analyzed,the reason for the error is explained,and the measurement error is statistically processed to improve the accuracy of the amplitude and phase.Based on the principle of the influence coefficient method,the multi-roller simultaneous balance method is explained in principle.On the basis of the adaptive multiple filter algorithm,the corresponding improvement is made.The amplitude and phase of the three rollers are extracted at the same time,and the single measurement is completed.The program building of the multi-roller balancing method.The software architecture and hardware system of the test system are designed and integrated,and verified through bench experiments.The experimental results show that the adaptive multiple filtering algorithm is more robust than the traditional algorithm,and can interfere with the operation of multiple drums.Under the background,accurately and stably extract the amplitude and phase of the unbalance signal;verify the single-point multi-roller balance method,before and after the roller balance,the single-point multi-roller balance method has a one-time unbalance reduction rate of 73.07%～79.45% Among them,the one-time unbalance reduction rate of the traditional balancing method is between 82.04% and 86.22%,which proves the effectiveness of the single measuring point multi-roller balancing method.The single measuring point multi-roller balancing method only needs 3 starts and stops.Balance 3rollers,and the balance efficiency is significantly improved.