A new type of vibration structure (i.e. supporting system, called swing frame cus- tomarily) of vertical dynamic balancing machine has been designed, which is based on an analysis for the swing frame of a traditiona...A new type of vibration structure (i.e. supporting system, called swing frame cus- tomarily) of vertical dynamic balancing machine has been designed, which is based on an analysis for the swing frame of a traditional double-plane vertical dynamic balancing machine. The static unbalance and couple unbalance can be e?ectively separated by using the new dynamic balancing machine with the new swing frame. By building the dynamics model, the advantages of the new structure are discussed in detail. The modal and harmonic response are analyzed by using the ANSYS7.0. By comparing the ?nite element modal analysis with the experimental modal analy- sis, the natural frequencies and vibration modes are found. There are many spring boards in the new swing frame. Their sti?nesses are di?erent and assorted with each other. Furthermore, there are three sensors on the measuring points. Therefore, the new dynamic balancing machine can measure static unbalance and coupling unbalance directly, and the interaction between them is faint. The result shows that the new vertical dynamic balancing machine is suitable for inertial measurement of ?ying objects, and can overcome the shortcomings of traditional double-plane vertical dynamic balancing machines, which the e?ect of plane-separation is inferior. The vertical dynamic balancing machine with the new vibration structure can ?nd wide application in the future. The modelling and analysis of the new vibration structure will provide theoretical basis and practical experience for designing new-type vertical dynamic balancing machines.展开更多
This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China....This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China.Based on dimensional analysis and similarity principle,two model tests with different slope angles were carried out.A transfer function analysis method was proposed to interpret the results from shaking table tests.After eliminating trend terms and signal filtering,the time-domain acceleration was transformed into frequency domain.Then the transfer function was calculated by an average periodic chart.The variation of transfer function from different positions was analyzed by Pearson correlation coefficient,and the least square iteration method was used for modal analysis.The effect of seismic intensity on the dynamic response was highlighted.It is found that the transfer function obviously changes when the slopes are destroyed.Results from modal analysis show that the natural frequency decreases with the increase of the excitation intensity,and the damping ratio increases due to slope damage.展开更多
基金Project supported by the National Natural Science Foundation of China (No.10176011).
文摘A new type of vibration structure (i.e. supporting system, called swing frame cus- tomarily) of vertical dynamic balancing machine has been designed, which is based on an analysis for the swing frame of a traditional double-plane vertical dynamic balancing machine. The static unbalance and couple unbalance can be e?ectively separated by using the new dynamic balancing machine with the new swing frame. By building the dynamics model, the advantages of the new structure are discussed in detail. The modal and harmonic response are analyzed by using the ANSYS7.0. By comparing the ?nite element modal analysis with the experimental modal analy- sis, the natural frequencies and vibration modes are found. There are many spring boards in the new swing frame. Their sti?nesses are di?erent and assorted with each other. Furthermore, there are three sensors on the measuring points. Therefore, the new dynamic balancing machine can measure static unbalance and coupling unbalance directly, and the interaction between them is faint. The result shows that the new vertical dynamic balancing machine is suitable for inertial measurement of ?ying objects, and can overcome the shortcomings of traditional double-plane vertical dynamic balancing machines, which the e?ect of plane-separation is inferior. The vertical dynamic balancing machine with the new vibration structure can ?nd wide application in the future. The modelling and analysis of the new vibration structure will provide theoretical basis and practical experience for designing new-type vertical dynamic balancing machines.
基金financially supported by National Natural Science Foundation of China(No.52078426)National Key Research and Development Plan(Grant No.2018YFE0207100)Sichuan Provincial Science and Technology Support Project(Grant No.2020YJ0253,c)。
文摘This paper aims to investigate the seismic motion characteristics of bedrock and overburden layer slope with the prototype model taken from slopes in the Zheduo Mountain in Northwest Plateau of Sichuan Province,China.Based on dimensional analysis and similarity principle,two model tests with different slope angles were carried out.A transfer function analysis method was proposed to interpret the results from shaking table tests.After eliminating trend terms and signal filtering,the time-domain acceleration was transformed into frequency domain.Then the transfer function was calculated by an average periodic chart.The variation of transfer function from different positions was analyzed by Pearson correlation coefficient,and the least square iteration method was used for modal analysis.The effect of seismic intensity on the dynamic response was highlighted.It is found that the transfer function obviously changes when the slopes are destroyed.Results from modal analysis show that the natural frequency decreases with the increase of the excitation intensity,and the damping ratio increases due to slope damage.
