Study On Ride Comfort Of Vibratory Compaction Machinery

Ride comfort is one of prime performance of vibratory compaction machinery, which is closely relative to drivers' comfort, reliability and life of parts of machinery. At present, study on vibratory compaction machinery is prime concentrated on vibratory force, press effect and parameter optimization design and study on ride comfort is very insufficient, so it is very necessary to discuss ride comfort of vibratory compaction machinery.Vibratory roller is one kind of vibratory compaction machinery, which is used most widely and press effect of is more better. This paper takes YZ12T vibratory roller as an example. According to the analysis of the vibratory roller structure characteristics, a seven freedom degrees vibratory roller model which can reflect vibration of the tyre driven vibratory roller is established. Using Lagrange differential equation, a differential equation set of the vibratory roller model is set up and acceleration power density spectrum of three test spots are gained. Simulation calculating programs are developed with Matlab programming language.The ride comfort experiment of YZ12T vibratory roller is carried out. The 1/3 octave band and weighed accelerations are exploited to estimate the ride comfort of the vibratory roller. Test results show that the ride comfort is very bad when the vibratory force is in the condition of low frequency flap and the ride comfort is somewhat better when the speed of the vibratory roller is about 2.0km/h and the vibratory force is in the condition of medium and high frequency flap and the ride comfort is somewhat worse when the speed of the vibratory roller is about 4.1km/h and the vibratory force is in the condition of medium and high frequency flap. Analyzed the acceleration power density spectrums of the test data, it can be found that the engine's vibration has little influence on the test spots' vibration under low frequency flap; under medium frequency flap, the engine's vibration has a little influence on vibration of the cab floor and driver's seat but has little influence on vibration of the frame; under high frequency flap, the engine'svibration have great influence on vibration of the cab floor and driver's seat but has little influence on vibration of the frame.Eliminated the influence of the engine's vibration, simulation results are basically corresponded with test results and the availability and reliability of the model are verified. Using the simulation calculation program and adopting the single factor analytic approach, simulation results are gotten and conclusions can be drawn from the simulation results. The parameters have a little influence on vibration of the driver's seat when the frequency of the vibratory force is larger than 20Hz, and the zone that the parameters have great influence on vibration of the driver's seat is nearby the sympathetic vibration frequency of the system which is about lOHz. Using one freedom degree vibration model, vibrating absorption effect is discussed and conclusion that absorber can take vibrating absorption effect only when vibratory force frequency isV2 times of inherent frequency of the system is drawn.