Study On Dynamic Characteritics And Vibration Stability Of The Screed

With the rapid development of highway construction, the requirement ofpavement also increases. Concrete paver is a main equipment of paving high graderoad and is the construction machinery while walking to work, the screed of paver hasa very important role in the quality of construction whether its performance is good ornot. To solve the problems of excessive vibration and poor vibration uniformity ofpaver screed appeared in the process of construction, In this paper, the dynamicsmodel and the virtual prototype model of screed is presented, the dynamiccharacteristics and vibration stability of the screed is studied, and the effects ofparameters on the vibration stability of screed is analyzed. Screed performance hasbeen greatly improved through structural parameter adjustment, and the project hasimportant theoretical and practical significance.First, the dynamics model of double-tamper mechanism is established throughthe analysis of the principle of the mechanism, and the dynamic characteristics isstudied. On this basis, the theoretical model of screed is established for the analysis ofthe dynamic characteristics of the entire screed, which provide the necessarytheoretical basis for the follow-up study.Secondly, finite element analysis was carried out on the screed with the finiteelement analysis software ANSYS to study the structure dynamics of the system, andthe static deformation, mainly vibration modal and modal frequency is obtained. Thestructural dynamics modification was carried out to make the each modal frequencyof screed as far as possible to avoid working frequency, in order to prevent the bodyvibration is too large to affect the quality of pavement paving.Based on the physical model of screed, the visualization of3D digital model ofscreed is established. According to real constraint state of the screed, taking theinclined support and movable arm as a flexible body, the virtual prototype model ofrigid-flexible coupling of the screed is established by using ADAMS software, and thedynamic of screed is analyzed in detail under different operation parameters andworking conditions, and the corresponding physical experiment is designed andcarried out to compare and verify. Through research, the influence of the operationparameters on the ironing plate vibration stability is founded, which provides areference for the design of paver screed and the adjustment of constructionparameters. Finally, the practical application of research to improve the design of the systemstructure is carried out. According to the virtual prototype model and dynamicanalysis results, the method of improving the screed vibration stability is researched.By optimizing the structural parameters of the vibration mechanism to improve thelateral vibration stability of the screed. Inertia force balance analysis is carried out onthe double-tamper mechanism to optimize the structure parameters and as far aspossible reduce the influence of inertia force produced by the vibrating mechanism onthe screed. The impact regularity of the vibration mechanism installation location andthe phase difference between double-tamper mechanism as a result of the screed isobtained. The study is performed digitally to avoid duplicate construction andrestructuring of the physical prototype, which can very good to short productdevelopment cycles and lower costs and make the subsequent construction of physicalprototypes more reliable and mature. Through the analysis of the contrast before andafter the improvement, after improved, the vibration stability of the screed get greatlyimproved, and the improved results is remarkable.