含侧向间隙刨煤机刨头接触碰撞动态特性研究
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摘要
为了研究侧向间隙对刨头动态特性的影响,依据刨头与滑架的几何构型,给出刨头与滑架之间的碰撞距离,构建刨头与滑架接触、分离判别条件。采用非线性弹簧阻尼接触力模型,建立了含间隙刨头碰撞振动动力学模型,并进行数值计算,研究结果表明:刨头与滑架之间产生了单点间断碰撞、两点交替碰撞及面碰撞;刨头与滑架的最大碰撞力随着侧向间隙的增大而逐渐增大。研究结果为提高刨头的运动稳定性提供了理论基础。
In order to study the effect of lateral clearance on plow head dynamic characteristics, the collision distance between plow head and sliding framework were given according to the geometry of plow body and sliding framework. The contact,isolation criterion between plow head and sliding framework was established. The nonlinear elastic-damper contact force model was adopted to establish the vibro-impact dynamic equation of plow body with clearance. And the numerical analysis was carried out.The results showed that single-point discontinuous impact, two-point alternative impact and surface impact between plow body and sliding framework were existed. The maximum collision force between each contact point of plow body and sliding framework increased with the increase of lateral clearance. The results provided theoretical basis for improving the stability of the plow body.
In order to study the effect of lateral clearance on plow head dynamic characteristics, the collision distance between plow head and sliding framework were given according to the geometry of plow body and sliding framework. The contact,isolation criterion between plow head and sliding framework was established. The nonlinear elastic-damper contact force model was adopted to establish the vibro-impact dynamic equation of plow body with clearance. And the numerical analysis was carried out.The results showed that single-point discontinuous impact, two-point alternative impact and surface impact between plow body and sliding framework were existed. The maximum collision force between each contact point of plow body and sliding framework increased with the increase of lateral clearance. The results provided theoretical basis for improving the stability of the plow body.
引文
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[10]Kil-Young Ahn,Bong-Jo Ryu.A modeling of impact dynamics and its application to impact force prediction[J].Journal of Mechanical Science and Technology,2005,19(1):422-428
[11]Seluk Erkaya,Ibrahim Uzmay.Modeling and simulation of joint clearance effects on mechanisms having rigid and flexible links[J].Journal of Mechanical Science and Technology,2014,28(8):2979-2986.
[12]Gerasimov S A.Vibrational-impact dynamics[J].Russian Engineering Research,2013,33(3):130-132.
[13]Cndida M Pereira,Amílcar L.A critical overview of internal and external cylinder contact force models[J].Nonlinear Dynamics,2010,63(4):681-697.
[14]Paulo Flores.A parametric study on the dynamic response of planar multibody systems with multiple clearance joints[J].Nonlinear Dynamics,2010,61(4):633-653.
[15]Qiang Tian,Cheng Liu,Margarida Machado.A new model for dry and lubricated cylindrical joints with clearance in spatial flexible multibody systems[J].Nonlinear Dynamics,2011,64(2):25-47.
[16]Landarani H M,Nikravesh P E.Continuous contact force models for impact analysis in multibody systems[J].Nonlinear Dynamic,1994,5(2):193-207.
[17]Lankarani H M,Nikravesh P E.A contact force model with hysteresis damping for impact analysis of multibody systems[J].Journal of Mechanical Design,1990,112:369-376.
[2]李晓豁,刘霞,焦丽,等.不同工况下滑行式刨煤机的动态仿真研究[J].煤炭学报,2010,35(7):1202-1205.
[3]李晓豁,宋元.拖钩刨刨头转角的运动学模型[J].黑龙江科技学院学报,2009,19(1):56-59.
[4]郝志勇,李贵轩,康晓敏.滑行刨煤机刨头的受力分析[J].煤矿机电,2005(1):21-23.
[5]金栋平,胡海岩.碰撞振动与控制[M].北京:科学出版社,2005.
[6]占甫,关富玲.含三维间隙铰空间可展机构动力学数值分析[J].浙江大学学报,2009,43(1):177-182.
[7]Ravn P.A continuous analysis method for planar multibody systems with joint clearance[J].Multibody System Dynamics,1998,2:1-24.
[8]Baiceanu M,Flores P,Oprisan C.Study of the contact force model on the dynamic response of a four-bar mechanism with clearance joints[J].New Trends in Mechanism and Machine Science,2012(7):541-548.
[9]Koshy C S,Flores P,Lankarani H M.Study of the effect of contact force model on the dynamic response of mechanical systems with dry clearance joints:computational and experimental approaches[J].Nonlinear Dynamics,2013,73(2):325-338.
[10]Kil-Young Ahn,Bong-Jo Ryu.A modeling of impact dynamics and its application to impact force prediction[J].Journal of Mechanical Science and Technology,2005,19(1):422-428
[11]Seluk Erkaya,Ibrahim Uzmay.Modeling and simulation of joint clearance effects on mechanisms having rigid and flexible links[J].Journal of Mechanical Science and Technology,2014,28(8):2979-2986.
[12]Gerasimov S A.Vibrational-impact dynamics[J].Russian Engineering Research,2013,33(3):130-132.
[13]Cndida M Pereira,Amílcar L.A critical overview of internal and external cylinder contact force models[J].Nonlinear Dynamics,2010,63(4):681-697.
[14]Paulo Flores.A parametric study on the dynamic response of planar multibody systems with multiple clearance joints[J].Nonlinear Dynamics,2010,61(4):633-653.
[15]Qiang Tian,Cheng Liu,Margarida Machado.A new model for dry and lubricated cylindrical joints with clearance in spatial flexible multibody systems[J].Nonlinear Dynamics,2011,64(2):25-47.
[16]Landarani H M,Nikravesh P E.Continuous contact force models for impact analysis in multibody systems[J].Nonlinear Dynamic,1994,5(2):193-207.
[17]Lankarani H M,Nikravesh P E.A contact force model with hysteresis damping for impact analysis of multibody systems[J].Journal of Mechanical Design,1990,112:369-376.