Research On The Damping Performance Of Tandem Vibratory Rollers

Tandem vibratory roller is the special machine primarily used to compact road surface, which is asked to have not only high rolling quality but also good comfort and reliability. Vibration reduction system of the roller is the important guarantee of comfort, and it also significantly affects both rolling performance and dynamic characteristics of the roller. However, there is no knowledge and corresponding research on the problem in the world at present. In order to solve this problem, basic characteristics of vibration reduction system and their influence on comfort and rolling quality were studied for the primary vibration reduction system of tandem vibratory roller.This thesis began with operating principle of vibration reduction system, analyzed material characteristics of rubber vibration absorber. It is considered that the absorber causes depletion of energy and exhibits nonlinear characteristics when subjected to vibration and shock. Based on hysteresis loop curves, vibration reduction effect of the absorber was analyzed from the point of view of energy. By means of making a test identification of shear modulus and damping ratio of the absorber with different frequency, variation rule and characteristics of dynamic stiffness and damping were reached.According to the specifications of human engineering, the influence of vibration reduction system of tandem vibratory roller on comfort was analyzed. It is found that frame vibration of the roller is a complex vibration composition, including the interaction between front and back vibration source, frame swing, nonuniform vibration between left and right side, vibration delay induced by the absorber, and so on. Swing model and nonuniform vibration model of tandem vibratory roller were established, and the influence of dual vibration source system on the frame vibration of the roller was analyzed. On these bases a new criterion for performance assessment of vibration reduction system was put forward.According to rolling quality specifications of tandem vibratory roller, the influence of vibration reduction system on the rolling quality was analyzed. It is found that parameter settings of vibration reduction system and its performance directly influence the realization of the vibration parameters. Unsuitable parameter settings resulted in amplitude excursion of left right side of the drum, and furtherly influenced uniformity and smoothness of the roller’s compaction; poor performance of vibration reduction system caused smaller amplitude than its design values, and therefore affected compaction degree of the roller.In order to analyze and optimize vibration and its absorption system of vibratory roller, the shaft sleeve force in ADAMS was used to simulate the rubber absorber, and the MNF of rubber floor in Ansys was adopted. Taking the ADAMS/View as a platform, parametric model of tandem vibratory roller was established, and the vibration acceleration of the roller’s different positions was simulated based on the model. The comparing result of simulation with experimental data shows that the accuracy of the model based on ADAMS and Ansys is high, which can truly reflect the dynamics of vibration transmission of the actual roller.At last, influencing factors on vibration reduction of tandem vibratory roller were summarized, and furtherly the parameters of optimal factors were given. Based on virtual prototype model, vibration reduction was simulated, and the results were consistent with the theory. The studies of the paper make progress in the vibration reduction system of the domestic tandem vibratory roller. The conclusions of the paper are significant in both research and application in upgrading performance and energy saving of the tandem roller. The studies of the paper have a reference value of other engineering machinery vibration reduction system.