In view of the disadvantages of traditional traction elevator,such as large space,high civil construction requirements,more blocking light to the first floor users and high cost,the new double column elevator without shaft is proposed.In order to ensure the safety and comfort of the elevator,the longitudinal vibration model was established by reasonable simplification.Differential equations of motion with multiple degrees of freedom was established based on Newton's second law.The natural frequency and har-monic response of the elevator were obtained by solving the differential equations,the natural frequencies of the elevator vary with dif-ferent bearing masses and different positions of the car,and the amplitude of vibration response varies with excitation frequency were discussed.The results show that the model can well predict the dynamic characteristic of the elevator under harmonic excitation,which provides a basis for the optimization of dynamic characteristics,vibration and noise reduction and fault diagnosis.
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