Nonlinear vibration model and response characteristic of drilling risers in deep-sea under soft suspension evacuation condition

2022 ◽  
Vol 169 ◽  
pp. 108783
Author(s):  
Jun Liu ◽  
Pucheng Wang ◽  
Xiaoqiang Guo ◽  
Liming Dai ◽  
Yufa He
2018 ◽  
Vol 94 (3) ◽  
pp. 2219-2241 ◽  
Author(s):  
Hui Li ◽  
Pengcheng Xue ◽  
Zhongwei Guan ◽  
Qingkai Han ◽  
Bangchun Wen

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041988187
Author(s):  
Bin Yu ◽  
Zhice Wang ◽  
Dayou Zhu ◽  
Guoye Wang ◽  
Dongxin Xu ◽  
...  

Mini vehicles with a small wheelbase are extremely sensitive to road roughness. The aim of this study is to explore the influence of road information on ride comfort and enhance the ride comfort of mini vehicles. According to the 5-degree-of-freedom vibration model of an electric mini off-road vehicle, the partial differential matrix equation of system motion is established using the Lagrange method, and the frequency response characteristic of the system is analyzed. The input matrix of pavement unevenness is obtained by considering the mutual power spectrum density between front and rear wheels. Road surface roughness information is obtained using an instrument for measuring road roughness. A comprehensive objective function and a constraint condition are established for comfort and safety. Based on the parameters obtained through the optimum design of a 1/4 vehicle model, the optimized stiffness and damping coefficient of suspension are obtained using a MATLAB optimization program. The law of the vibration performance of off-road vehicles with respect to suspension stiffness and the damping coefficient is obtained through the analysis of optimized results. A driving simulation and a test are conducted on the electric mini off-road vehicle. The results show that the use of the measured pavement data as simulation input is closer to the actual situation and provides higher accuracy compared to the simulated pavement model. According to the optimization and test results, the parameters optimized by a 1/2 vehicle (5 degrees of freedom) vibration model are better than those optimized by the 1/4 vehicle vibration model. The optimization results confirm reduction in acceleration, acceleration power spectrum density, and the root mean square of the weighted acceleration of the seat. This shows that the electric mini off-road vehicle provides better ride comfortability after optimization.


2011 ◽  
Vol 121-126 ◽  
pp. 2121-2125
Author(s):  
Yuan Hao ◽  
Zhao Hui Ren ◽  
Feng Wen

On the basis of the relation between force and deformation when the plastic deformation of soil mass is studied, nonlinear vibration roller model is built. Based on one type vibratory rollers select the system parameters and calculate the natural frequency. And according to the selected numerical value proceed the numerical simulation with different excitation force frequencies. Meanwhile, obtain and analyze the experimental data according to the vibratory roller experiment. Then the system response characteristic of nonlinear vibration roller is obtained, and the availability of system model is checked. All above provide the valuable theoretical basis for the research of vibrating compacting.


2013 ◽  
Vol 311 ◽  
pp. 105-110
Author(s):  
Shueei Muh Lin

In this study, the nonlinear vibration model of structure with cross support is established. The conventional structure without cross support is linear and easy to be investigated. Unfortunately, its dynamic stability and vibration due to earthquake excitation are usually not acceptable. For suppressing the structural vibration the cross support composed of the elastic connecting bar and damper is considered here. This is a passive control design. Beside, due to the supporting arrangement, the mathematical model of the structure is highly nonlinear. In this study, the analytical solution for this system is derived. Further, the effects of control parameters on the vibration response are investigated.


2011 ◽  
Vol 2-3 ◽  
pp. 954-959 ◽  
Author(s):  
Min Wu ◽  
Jin Fu Yang

Based on mechanical properties of rotor nonlinear vibration and the assumption of large deformation, the rotor nonlinear vibration model in the form of Duffing equation is constructed from typical engineering problems. According to analytical solutions of Duffing equation, system’s equivalent frequency and frequency response equation are derived. Furthermore, the influences of stiffness, damping and nonlinear components are studied. The single-disc rotor nonlinear vibration experimental results verify the rationality and efficiency of nonlinear vibration model’s construction and Duffing equation’s analytical solution and frequency response equation. The mechanisms of resonance, amplitude jump and hysteresis are also revealed. It provides a new research method for rotor vibration characteristics analysis.


2020 ◽  
Vol 81 ◽  
pp. 50-69 ◽  
Author(s):  
Jun Liu ◽  
Xiaoqiang Guo ◽  
Guorong Wang ◽  
Qingyou Liu ◽  
Dake Fang ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document