Correlation Analysis Of Structural Vibration Natural Frequency And Constraint

Vibration problem has great significance in various aspects to the production and normallife. Vibration is mainly used for the following two aspects. One is to use the self vibration ofstructure to achieve a purpose, the other is by changing some vibration to meet therequirements. Predecessors have made a lot of research and methods on changing and controlthe structure of vibration problems. There is a long history of researching on the naturalfrequency of the structure vibration. It is theory and actual practicable feasible by changingthe structure stiffness matrix and mass matrix to change natural frequency of the structurevibration.For a certain model satellite dynamic performance analysis, the study found whenloading large panel structure, the whole panel system modal is low, in the analysis of thefrequency response, the peak response of the panel is larger. This article is from the freedomof the structure of the modal frequency to calculate natural frequency of the constraintstructure, in order to achieve the purpose of control structure inherent frequency by changingthe constraint. Through the additional quality standard, the residual flexibility method, theimproved residual flexibility method and dynamic flexibility method of theory research andexample to achieve by changing the structure of the constraint stiffness of size, quantity, andlocation to control structural vibration natural frequency, the purpose of research is verymeaningful in theory. The first part is about the study of constraint stiffness impact on thenatural frequency of the structure size; The second part is as constraint location and numberof impact on the natural frequency of the structure. Calculated by the free structure, thestructure of the constraint modal vibration mode, the first thing to solve is that we can test thelow-order modal frequencies of the structure are free. In order to improve the accuracy ofcalculation, we have to consider neglected modes frequency effect on the calculation results.Based on the spectral decomposition method we will neglected modes frequencyapproximated by low-order modal frequency. One additional quality standard does notconsider the effect of neglected modes. The rest of the several methods, considering theinfluence of the neglected modes. Based on the several methods of calculating theoryresearch and example calculation, draw the role of constraints, size, quantity, and location incalculation.The main method in this paper of researching on restraint stiffness of size effect on thenatural frequency of the constraint structure is the dynamic flexibility method, andapplication of dynamic flexibility method can calculate the freedom of known structure of thenumber of low-order modal order of low-order modal, the key is how to solve high orderdynamic flexibility.Research on stiffness size of the constraint can discipline structure in validation ofmodal frequency of the test data. Based on the test data obtained by substructure under thecondition of freedom theory calculation can be obtained under the condition of constraintmodal frequency of the data. The constraint location and quantity of the influence of thestructure natural frequency is important in the structural optimization. There is not muchachievements for topology optimization of the structure. In which constraint position has an important effect on natural frequency, it is an important information of topology optimization...