Research On Dynamic Design About Power Head Of Tunnel Drilling Rig

This paper studies the dynamic characteristics and dynamic design about themajor components of the the power head of drilling rig.The results obtained form thetraditional static design often can not meet the operating the dynamic parametersappearing in the actual work.Especially facing the excitation from the formation orfrom other vibration,the vibration may be too large or resonance,and that will lead toaccelerated destruction of the rig structure or cause functional failure.Therefore,afterthe static design and before the experiments of prototypes,using the the dynamicfactors of actual condition to do dynamic design is of great significance.In the dynamic design, the main consideration are modality of each componentof the power head.This is done mainly from the vibration theory by studying theirchanges of natural frequencies and mode shapes.To avoid severe vibration orresonance,general practice is making the natural frequencies of the components awayfrom the excitation frequency,and common method is to improve the naturalfrequency to avoid such situations.Because different environments and functions ofparts,the main components design with different dynamic method.Contents of thearticle include the following aspects:(1)Conceptual design of mechanical systems of power head of drilling rig.Conceptual design is the leading part of the engineering design.The conceptualdesign of power head of tunnel drilling rig is designed for its required functionalityand then do function modeling and function decomposition,and then making thecommon drive scheme of power head on the market as the goal,respectively,using avariety of common evaluation indexes to do its evaluation,finally choose the optimalscheme by using fuzzy recognition model.(2)The static design,3d modeling and optimization design of the power head oftunnel drilling rig.According to the power consumed by the drilling process of tunnel drilling rigand the selected the optimal solution in (1),formulating power head engine type andusing suitable reduction ratio to make optimal design for transmission using MATLAB.Aiming at the advantages and disadvantages of mainstreamchucks,designing a new chuck, and using3d software Pro/E to to do modelingpreliminary,using ANSYS to do dynamic analysis and using ADAMS to dokinematics analysis to the modeling.(3)The dynamic design of power head of the tunnel drilling rigAccording to the theory of dynamic design,respectively do structural dynamicanalysis and dynamic designfor transmission,spindle,power head box,new doublewedge slip.Different dynamic design methods used in different parts.Dynamic designmethod of transmission is from the existing research theory and the movementcondition of load to consider modifying of its structure.In this part,in addition toconventional design conditions,the other main research the relationship between thenumber of teeth on the sun gear and the number of planet wheels to Improve exerciseand vibration;Thedynamic design method of spindle is using ANSYS to analyze itsmodal and to study its impact on the main structure parameters about each mode,thencalculating sensitivity of parameters to the natural frequencies,and finally to increasethe frequency as goal-driven,determining optimized design;Power head boxmainresearch its changes of mode shapes,for which a large part of the structure relativeamplitude changes,to reduce the relative amplitude;new double wedge slip method isafter Pro/E modeling,studying global sensitivity of its frequency,obtained a goodrange of each parameter,and finally to reduce the quality and to improve frequency asthe target to reduce function,finding the optimal solution.