Improvement of dynamic response in an impact absorber by frictional elements

Bedolla, Jorge; Szwedowicz, Dariusz; Jiménez, J.; Majewski, Tadeusz; Cortés, Claudia; Gutierrez-Wing, E. S.

doi:10.1007/s12206-014-0303-2

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Leakage rate, which directly indicates the state of a sealing structure, is difficult to determine due to the small scale and complicated structure of sealing channels. Trial-and-error experimentation [33][34][35] is a commonly used method for overcoming these challenges, but it is costly and time-consuming, and the results obtained may not be directly applicable. In addition, leakage models based on test results often fail to reveal the effect of different factors on sealing performance because of the number of factors involved.…”

Section: Introductionmentioning

confidence: 99%

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Li,

Zhang,

Fang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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In service, thermal-mechanical coupling conditions can exacerbate stress relaxation of O-rings and lead to their thermal expansion, further complicating the sealing problem. A finite element method is developed to simulate the mechanical deformation behavior of O-rings under thermal-mechanical coupling conditions, and its validity is verified by comparison with experimental data. Based on a substantial amount of simulation data, it is found that a dimensionless contact stress can be used as an indicator of the degradation of sealing performance and can be related to temperature T and time τ in the form of an aging kinetic equation. By combining this equation with the existing interfacial leakage model, an approach of predicting the long-term leakage rate of O-rings is proposed to quantitatively evaluate the effect of various factors on the performance of O-rings, and some important conclusions are drawn. Regarding the effect of temperature on O-rings, the thermal expansion effect dominates when the service time is less than 20 days, and the stress relaxation effect prevails when it is greater than 20 days. The higher the temperature, the more significant the stress relaxation, and the faster the leakage rate of O-rings. Increasing the fluid pressure enhances the relaxation effect. Using the maximum allowable leakage rate as the failure criterion, a pressure-temperature curve is plotted representing the safety boundaries, which can be used to guide the design of the sealing structures. Furthermore, an exhaustive study on the service life evaluation shows that at high temperature (T ≥ 120 ℃), the service life curves show a plunging segment near a pressure rise to 0.42 MPa.

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Section: Introductionmentioning

confidence: 99%

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Li,

Zhang,

Fang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

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“…Overcoming the immaturity and the lack of design direction requires an effective leakage prediction model [6,25,26], especially in the conceptual design phase. Many researchers have developed leakage prediction models based on experimental methods [27][28][29]. However, because test results include the contribution of several factors, empirical models often have difficulty in establishing quantitative relationships between individual factors and leakage amount, and thus it may be difficult to use them to extrapolate to severe service conditions or after long-term operation, unless the test conditions themselves are relevant.…”

Section: Introductionmentioning

confidence: 99%

Study on interfacial leakage characteristics of rubber sealing under temperature cycle conditions in PEM fuel cell

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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The amount of leakage is the only direct indicator of the sealing performance of a Proton Exchange Membrane Fuel Cell (PEMFC). In this work, a predictive model is developed to quantitatively evaluate the variation of leakage for a PEMFC under temperature cycling conditions. The method first uses the Lattice-Boltzmann Method (LBM) to simulate the gas flow within the contact interfacial gap at various heights. Then the Finite Element Method is used to analyze the local and macroscale contact state of the sealing interface and to clarify the effect of contact stresses on the interfacial gap height. Finally, the generalized Maxwell model, which considers time-temperature transfer and stiffness growth, is used to calculate the interfacial contact stresses under temperature cycling. The validity of the model was verified by comparison with experimental data from the available literature. Further analysis showed that reduced start-up temperature exacerbated the stress relaxation effect and decreased the service life of the seal material. When the start-up temperature is reduced from 25°C to -20°C, the model predicts that the service life of the PEMFC will be reduced by 100 temperature cycles or more. The leakage variation in a cycle was also discussed, and it was found that the leakage fluctuation became more and more significant as the number of cycles increased, weakening system reliability.

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“…Además, fue sometido a pruebas de impacto cíclico con un mecanismo manivela, biela, corredera a una determinada frecuencia de trabajo, con el fin de cuantificar la cantidad de energía que este dispositivo es capaz de disipar. Se ha analizado numérica y experimentalmente la forma en que el prototipo disipa energía a través de sus distintos elementos (vástago, aros deformables, carcasa) y la influencia de las interacciones de contacto entre superficies [20], [21] . Se encontró que el dispositivo es capaz de disipar cerca del 88 % de energía en un evento de impacto y, además, puede disipar energía por varios ciclos, de ahí que el dispositivo presente características de un amortiguador y sea capaz de atenuar las vibraciones en sistemas mecánicos.…”

Section: Introductionunclassified

Análisis experimental de un dispositivo tope de impacto como atenuador de vibraciones en banco experimental

Baltazar Tadeo,

Cortés García,

Martínez Rayón

2023

CULCyT

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En este trabajo se analiza experimentalmente el funcionamiento de un dispositivo tope de impacto como atenuador de vibraciones de un sistema sometido a vibración forzada. Para este propósito, se diseñó y construyó un banco de pruebas experimentales conformado por una viga en voladizo a la cual se montó en su extremo libre un motor con desbalance rotatorio para hacerla vibrar. El dispositivo tope de impacto se colocó en el extremo libre de la viga y recibió la energía cinética de la viga a través de múltiples eventos de impacto, disipando energía de vibración por un mecanismo de fricción. Asimismo, se realizó un análisis con variables tales como fuerza de fricción (gobernada por un tornillo de ajuste en el dispositivo), rigidez de los resortes del prototipo (que actúan como elementos de restitución del elemento móvil del dispositivo) y el claro entre el tope de impacto y la estructura. En el análisis paramétrico, se identificó, de entre las variables propuestas, los parámetros que mejoran la atenuación de vibración en la estructura vibratoria. Como resultado de este estudio, se lograron importantes reducciones de amplitud de vibración, de más del 90 %, por efecto del dispositivo tope de impacto en el sistema vibratorio.

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Improvement of dynamic response in an impact absorber by frictional elements

Cited by 7 publications

References 23 publications

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Long-term sealing performance evaluation and service life prediction of O-rings under thermal–mechanical coupling conditions

Study on interfacial leakage characteristics of rubber sealing under temperature cycle conditions in PEM fuel cell

Análisis experimental de un dispositivo tope de impacto como atenuador de vibraciones en banco experimental

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