【作者】 钟志平； 何胜煜； 胡远彪； 卜长根；

【Author】 Zhong Zhiping;He Shengyu;Hu Yuanbiao;Bu Changgen;China University of Geosciences;

【机构】 中国地质大学(北京)；

【摘要】 不同于电磁谐和激励振动,惯性激励振动沉入/压实机械常因不明原因的功率异常增大而损坏,如何确定惯性激励振动机械耗散功率是其设计中首先要面对的关键理论问题。考虑到惯性激励振动沉入/压实机械的系统输入功率与系统阻尼耗散功率相同,本文利用阻尼力与速度乘积的方式计算瞬时功率。瞬时功率函数的变化频率是速度和位移的2倍频,最大功率为平均功率2倍,均与激振力幅值F₀、位移名义幅值A成正比;当系统处于较大角频率非共振区时,耗散功率与阻尼成正比,与系统质量成反比;共振区系统耗散功率与刚度成正比,而与阻尼成反比,随阻尼比的减小时激增,会引起系统功率显著增大。更多还原

【Abstract】 The vibratory piling/compacting machinery with inertia induced excitation often breaks down with abnormal power increase for unknown reasons,which is different from electromagnetic harmonic excitation vibration.It is a key theoretical problem on how to determine the dissipation power of inertia excited vibration machinery in its design.In this paper,the instantaneous power is calculated by the product of damping force times velocity,because the input power of the inertia excitation vibratory piling/compacting machinery is the same as the damping dissipation power of the system.The maximum power is twice the average power,both of them are proportional to the magnitude of exciting force F₀ and nominal displacement A,and the frequency of the instantaneous power function is twice the frequency of the velocity displacement functions.When the system is in the non-resonant region of larger angular frequency,the dissipation power is proportional to the damping and inversely proportional to the mass of the system.In the resonant region,the dissipation power of the system is proportional to the rigidness and inversely proportional to the damping.The system power has a significant increase with the decrease of the damping ratio.更多还原