TBM刀盘系统动态特性及参数影响
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摘要
隧道掘进机刀盘在掘进过程中承受高强度冲击载荷,振动十分剧烈,导致关键构件过早损伤失效,有必要在设计阶段研究刀盘系统的振动特性及其参数影响。为此,在已有TBM刀盘系统多自由度耦合动力学模型的基础上,通过求解各阶固有频率和振型,得到各构件的模态能量分布,进一步区分各阶模态振型,识别模态敏感参数,并分析了敏感参数对前10阶频率的影响。研究结果表明,刀盘系统模态振动主要集中在中间阶,且纯扭转振型对应的固有频率为57 Hz;模态能量能够区分各阶振型,且和常规的振型分析结论一致;第2~10阶固有频率主要受小齿轮转动惯量和输入端扭转刚度的影响,且这两个值分别取原始方案的1.1倍和1.3倍时,系统振动特性较稳定。
A tunnel boring machine( TBM) cutterhead endures heavy impact loads during excavation. It vibrates fiercely and causes vital components to fail early. Therefore,it is indispensable to study the vibration characteristics of the cutterhead and the influence of mass and stiffness parameters at the design stage. For this purpose,the modal energy distributions of each component were obtained by solving natural frequencies and vibration modes of each order by using the coupling dynamics model of the TBM cutterhead system. Next,the modal vibration modes of each order were distinguished,sensitive modal parameters were identified,and their influences on the first 10 frequencies were analyzed. The results show that the modal vibration of the cutterhead system is focused mainly in the medial orders,and the natural frequency corresponding to the pure torsional vibration mode is 57 Hz. Each vibration mode can be distinguished by its modal energy,which is consistent with conventional vibration mode analysis. In addition,natural frequencies of orders 2~10 are affected mainly by pinion inertia and torsional stiffness of the input terminal. The vibration characteristics are more stable when the two values are equal to 1.1 and 1.3 times those in the original scheme,respectively.
A tunnel boring machine( TBM) cutterhead endures heavy impact loads during excavation. It vibrates fiercely and causes vital components to fail early. Therefore,it is indispensable to study the vibration characteristics of the cutterhead and the influence of mass and stiffness parameters at the design stage. For this purpose,the modal energy distributions of each component were obtained by solving natural frequencies and vibration modes of each order by using the coupling dynamics model of the TBM cutterhead system. Next,the modal vibration modes of each order were distinguished,sensitive modal parameters were identified,and their influences on the first 10 frequencies were analyzed. The results show that the modal vibration of the cutterhead system is focused mainly in the medial orders,and the natural frequency corresponding to the pure torsional vibration mode is 57 Hz. Each vibration mode can be distinguished by its modal energy,which is consistent with conventional vibration mode analysis. In addition,natural frequencies of orders 2~10 are affected mainly by pinion inertia and torsional stiffness of the input terminal. The vibration characteristics are more stable when the two values are equal to 1.1 and 1.3 times those in the original scheme,respectively.
引文
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[2]谭青,易念恩,夏毅敏,等.TBM滚刀破岩动态特性与最优刀间距研究[J].岩石力学与工程学报,2012,31(12):2453-2464.TAN Qing,YI Nianen,XIA Yimin,et al.Research on rock dynamic fragmentation characteristics by TBM cutters and cutter spacing optimization[J].Chinese journal of rock mechanics and engineering,2012,31(12):2453-2464.
[3]XIA Yimin,OUYANG Tao,ZHANG Xinming,et al.Mechanical model of breaking rock and force characteristic of disc cutter[J].Journal of Central South university,2012,19(7):1846-1852.
[4]韩美东,蔡宗熙,曲传咏.基于动力稳定性的全断面岩石隧道掘进机刀盘临界推进速度研究[J].机械工程学报,2014,50(21):1-7.HAN Meidong,CAI Zongxi,QU Chuanyong.Study on the critical driving speed of the tunnel boring machine cutterhead based on the dynamic stability[J].Journal of mechanical engineering,2014,50(21):1-7.
[5]HUO Junzhou,OUYANG Xiangyu,ZHANG Xu,et al.The Influence of front support on vibration behaviors of TBM cutterhead under impact heavy loads[J].Applied mechanics and materials,2014,541/542:641-644.
[6]ZHU Lida,SU Pengcheng,LI Gang,et al.Dynamic analysis of cutter head system in tunnel boring machine[J].Advanced materials research,2011,186:51-55.
[7]LI Xianhong,YU Haibin,YUAN Mingzhe,et al.Dynamic modeling and analysis of shield TBM cutterhead driving system[J].Journal of dynamic systems measurement and control,2010,132(4):044504.
[8]SUN Wei,LING Jingxiu,HUO Junzhou,et al.Dynamic characteristics study with multidegree-of-freedom coupling in TBM cutterhead system based on complex factors[J].Mathematical problems in engineering,2013,2013:635809.
[9]霍军周,欧阳湘宇,王亚杰,等.重载冲击激励下TBM刀盘振动特性的影响因素分析[J].哈尔滨工程大学学报,2015,36(4):555-559.HUO Junzhou,OUYANG Xiangyu,WANG Yajie,et al.Analysis of influencing factors of vibration behaviors of TBM cutterhead under heavy impact loads[J].Journal of Harbin Engineering University,2015,36(4):555-559.
[10]GUO Yichao,PARKER R G.Sensitivity of general compound planetary gear natural frequencies and vibration modes to model parameters[J].Journal of vibration and acoustics,2010,132(1):011006(1)-011006(13).
[11]冯海生,王黎钦,郑德志,等.柔性齿轮-柔性转子-滑动轴承系统动特性分析[J].哈尔滨工程大学学报,2015,36(3):384-388.FENG Haisheng,WANG Liqin,ZHENG Dezhi,et al.Analysis of the dynamic characteristics of flexible gear-flexible rotor-journal bearing system[J].Journal of Harbin Engineering University,2015,36(3):384-388.
[12]段福海,胡青春,谢存禧.钢/塑料齿轮组合行星传动的固有特性分析[J].中国机械工程,2008,19(20):2423-2427.DUAN Fuhai,HU Qingchun,XIE Cunxi.Natural modes of Steel/plastic compound planetary gear sets[J].China mechanical engineering,2008,19(20):2423-2427.
[13]凌静秀,孙伟,霍军周,等.TBM刀盘系统多自由度耦合固有特性及敏感度[J].东北大学学报:自然科学版,2015,36(4):546-550.LING Jingxiu,SUN Wei,HUO Junzhou,et al.Natural characteristics and sensitivity of TBM cutterhead system with multi-degree-of-freedom coupling[J].Journal of Northeastern University:natural science,2015,36(4):546-550.