| The problem of liquid sloshing is widespread in large-scale liquid-filled spacecraft,liquid rockets,heavy vehicles with liquid storage tanks,ships and other vehicles.The dynamic sloshing power and torque generated by the liquid sloshing in the tank will seriously affect the control system or control of the vehicle.The task execution efficiency,control accuracy and overall stability of the system have long been favored by a large number of scholars at home and abroad for the study of liquid sloshing problems,and a large number of fruitful research results have been obtained.Therefore,the dynamic sloshing power and sloshing moment of the liquid have been studied.The research on the experimental methods of related kinetic characteristics has great research significance.This work aims at the efficient and accurate measurement of sloshing power and sloshing moment.Based on the foundation of liquid sloshing dynamics and the principle of liquid sloshing acquisition,a real-time solution that can realize the fixed installation of the liquid-filled tank structure and maximize the real-time An experimental platform device that accurately measures and effectively analyzes the dynamic sloshing power and sloshing moment generated by the liquid sloshing in the storage cavity.Through the combination of experiment and CFD simulation,the behavior and dynamic characteristics of the nonlinear steady-state sloshing of the liquid in the cylindrical storage cavity are analyzed.The main research content and results of the thesis are as follows:(1)According to the existing experimental conditions,using force sensors,acceleration sensors,signal generators,power amplifiers,vibration exciters,dynamic signal acquisition instruments and other instruments and equipment,successfully built a fluid-filled storage cavity dynamics simulation experimental platform device.Established methods for checking the sensitivity of acceleration sensors and force sensors,and verified the sensitivity accuracy and measurement performance of the force sensors using static and dynamic methods respectively,designed an experimental program for the study of the dynamic characteristics of liquid sloshing,and deduced the corresponding Experimental data processing method.(2)The first-order natural frequency of the liquid obtained through experiments is compared and analyzed with the theoretical formula of CFD simulation and natural frequency.The theoretical calculation value and CFD software simulation result are both slightly higher than the experimental results,which is preliminary verification.Reliability of experimental measurement.Secondly,the experimental sloshing power and sloshing moment data were compared and analyzed with CFD to verify the accuracy of the liquid sloshing experimental data measurement and the validity and accuracy of the CFD software to analyze the liquid sloshing problem in the tank.It was found that the CFD software can study general conditions.Under the liquid sloshing behavior,it is impossible to accurately simulate and analyze the dynamic characteristics of the liquid sloshing when the liquid in the tank rotates violently,which is not conducive to independent research to reveal the true sloshing characteristics of the liquid in the tank.Finally,in view of the limitations of CFD simulation analysis,the non-linear steady-state sloshing behavior characteristics of liquids are further studied in detail through experimental methods,and the five types of sloshing behavior characteristics of the liquid in the tank are excited and summarized.Analysis of the data shows that the liquid rotation direction and sloshing mode in the free liquid surface are independent of the excitation amplitude,and the maximum sloshing force and sloshing torque do not change with the change of the rotation state.(3)With the help of CFD software,the liquid sloshing containing the annular wave breaker in the liquid-filled storage cavity was simulated,and the liquid sloshing behavior characteristics and dynamic characteristics were effectively analyzed.Research has shown that the closer the ring plate in the liquid is to the free surface of the liquid,the better the suppression effect.It can not only effectively suppress the limited amplitude sloshing of the liquid,but also completely eliminate the liquid rotating sloshing.A reasonable combination of parameters makes the violent and complex rotation more stable.The finite amplitude standing wave shaking.The successful construction of the liquid sloshing experimental platform device designed in the article and the research of efficient and accurate measurement methods have realized the maximum measurement of the unbalanced sloshing power and sloshing moment generated by the liquid sloshing in the tank,enriching the analysis of the cylindrical tank through the experimental method The research results on the dynamic characteristics and behavior characteristics of the nonlinear steady-state sloshing of the inner liquid are of great significance to the research on the task execution efficiency,control accuracy and overall stability of the vehicle control system or control system,in order to further realize the liquid sloshing dynamics On-line real-time measurement of characteristics,load feedback,sloshing state recognition,sloshing suppression,vehicle stability control and other related dynamics and control problems provide certain reference data and experimental research foundation. |
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