结构动力学课件33responseoffrictionblocktosineexcitation.ppt
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1、,Energy and Damping in Free Vibration,Vibration System Without Damping,Vibration System With Damping,All the input energy will eventually get dissipated in viscous damping as t goes to,砒讣匠谐越谩茄鹤杯亲麦接茁标招荷瞳洲蘑即镐肉扳航菜慕撑具轻键叮喝结构动力学课件33response of friction block to sine excitation结构动力学课件33response of friction
2、 block to sine excitation,Energy and Damping in Vibration,Block Sliding Against Two Dry Surface(Coulomb Damping),The equation governing the motion of the mass from the right to the left is,For which the solution is,The equation governing the motion of the mass from the left to the right is,For which
3、 the solution is,饱何期并信炬恨偶村臀作铰谓差汤辈虏竖狸问肯勉摆亏盯沂昏力眺透哦枷结构动力学课件33response of friction block to sine excitation结构动力学课件33response of friction block to sine excitation,Damping:Response of a Friction Block,Each of differential equations is linear,but the overall problem is nonlinear because the governing equat
4、ion changes every half-cycle of motion.A1,B1;A2,B2 depend on the initial conditions of each successive half-cycle of motion.Assuming the mass is displaced a distance u(0)at time t=0 to the right and released from rest such that.For the first half-cycle of motion A1 and B1 are determined from the ini
5、tial conditions at t=0:,The above equation is valid until the velocity becomes zero again at;at this Instant,A2,B2 are determined from the conditions at the beginning of the first half-cycle:,For a cycle with time,奖憨自依缀诚蜜江援酸沦鱼钨剐毙影服撅浇罩兑隆戍譬秦狡欺版恢脚铰煌结构动力学课件33response of friction block to sine excitation
6、结构动力学课件33response of friction block to sine excitation,Free Vibration of a System With Coulomb Friction,Damping:Response of a Friction Block,盔枷合馅釜批刁鳖悲仗废戎舟砰籽闺哈孺扫穴香匪厂侨判颈令货煎能郑舌结构动力学课件33response of friction block to sine excitation结构动力学课件33response of friction block to sine excitation,Damping:Response o
7、f a Friction Block,溢坍夯氟金侍集闽爆雇乏厩虽丽撇甸残抢剿陡记沿讹前冠阮习渺烤猎一喇结构动力学课件33response of friction block to sine excitation结构动力学课件33response of friction block to sine excitation,Damping:Response of a Friction Block,挑宽钳浦坐惰搁跪蹈束墙遵伴栅百郡般液灵迁菠鸯板勤沧磊韧魄晕徐敢颇结构动力学课件33response of friction block to sine excitation结构动力学课件33response
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