Study On Frequency-Dependent Dynamic Properties Of Elastomer O-Ring Support Part

Elastomer O-ring support part could be used to decrease or even hold-up the unbalanced response of high-speed winder rotating system, while the dynamic properties, stiffness or damping, of elastomers could be affected by various factors such as, temperature, structural parameters of O-ring support part, material est. Since O-ring support parts working respectively as dampers and support parts, are exposed to various loads and different working conditions, their dynamic properties are affected by different factors.It is the intent of this paper to provide fundamental tests and researches of elastomer O-ring support part used in high-speed winder head for independent development, thus this paper studied the frequency-dependent dynamic properties of elastomer O-ring support part and its three structural factors contributing to the dynamic properties. O-ring support part working as support part being applied in aerospace is more developed rather than those applied in filament winder machinery nowadays in China. Hence this paper came up with research methods in terms of O-ring support part used in winder head according to the theory applied in non-civil fields, and did some experimental research regarding three structural factors contributing to the dynamic properties.At first, this paper analyzed the working condition of winder head and the characters of O-ring-Rolling bearing support system. It described the general research methods and principles of frequency-dependent dynamic properties of elastomer O-ring support part, and determined the research principle, forced nonresonant testing method, for studying the O-ring support part applied in winder head. Secondly, this paper built a testing system, including determining parameters of excitation and structural parameters of testing models, parameters of data acquisition system as well as methods for data processing.Thirdly, it worked out that number, initial compression, diameter of elastomer O-ring support part are three structural parameters in their value range contributing to dynamic properties of O-ring support part. It determined the specific dimensions of testing models and arranged the whole experiments according to the three parameters and its value ranges. While it analyzed the experimental precautions and errors. According to original experiment data and the results from data processing, it got frequency-dependent dynamic properties curve of O-ring support part and fit these curves using a non-linear least square method. All curves and results if could not be shown in contain are shown in attachments.At last, it could be determined from the expected value of equivalent stiffness, equivalent damping, and response amplitude of vibration mass for choosing the different combinations of three structural parameters of elastomer O-ring support part. It worked out the influence of every single parameter using univariate analysis and the comprehensive influence of three parameters using statistic analysis. If the value of arbitrary two out of three parameters were determined, the function of the left parameter to dynamic parameter could be got from this research. Number and initial compression are respectively the linear impact factors of dynamic parameter of O-ring support parts. Thus, dynamic parameters of O-ring support parts under different number and initial compression values could be got using the linear functions. In order to work out optimistic expected dynamic properties for winder head rotating system, it is necessary to choose suitable structural parameter combinations for different machinery. Results of this research could be helpful.This research has several innovative points listing as below,1. This paper introduced and improved a research method from non-civil aerospace fields to civil filaments winder machinery fields. Taking the benefits of amplitude-frequency characteristics and phase-frequency characteristics of vibration system, it improved the traditional forced resonant method and used the forced nonresonant method as a testing method.2. It fitted the frequency-dependent properties curve of O-ring support part using non-linear least square method and concluded that under the excitation frequency range of100Hz-400Hz, the function of frequency-stiffness and the function of frequency-damping respectively accord with one specific format. This paper randomly did several simulations to verify the reliability of these testing results.3. It is important to determine the three structural parameters of elastomer O-ring support part when researching its dynamic properties and design its structure. This paper used experimental and statistic method to work out the relation between the three parameters and dynamic properties. The results could be shown in several diagrams and forms. It could serve as fundamental research to design the support part of elastomer O-ring support part applied in filament winder head.