scholarly journals A Novel Structure of Rubber Ring for Hydraulic Buffer Seal Based on Numerical Simulation

2021 ◽  
Vol 11 (5) ◽  
pp. 2036
Author(s):  
Lin Zhang ◽  
Xiaohui Wei
Keyword(s):  
Simulation Method ◽  
Landing Gear ◽  
Hydraulic Pressure ◽  
Rubber Material ◽  
Rubber Ring ◽  
Factors Affecting ◽  
Novel Structure ◽  
Sealing Performance ◽  
Pearson Coefficient ◽  
Sealing Ring

Landing gear is a key load-bearing structure of aircraft during ground operation, and the landing capacity of landing gear is determined by the performance of buffer. To solve the problem of buffer failure caused by insufficient static sealing of a rubber ring at groove side, a new structure of a butterfly rubber ring is proposed by analyzing the factors affecting sealing performance of the rubber ring. First, the constitutive equation of rubber material is derived based on the theory of hyper-elasticity, and the material parameters are obtained by fitting the experimental data. Then, by analyzing the simulation method of installation mode and installation stroke, the simulation method suitable for calculating the sealing performance of the rubber ring is established. The linear fitting formulas with Pearson coefficient greater than 0.92 are used to discuss the influence of pre-compression rate and hydraulic pressure on the sealing performance of the rubber ring. Compared with O-ring, the contact pressure of butterfly-ring is increased by 30% in assembly state and 14% in working state. The results show that the butterfly rubber ring has excellent static sealing performance. It is concluded that improving the configuration of the sealing ring can solve the insufficient unilateral sealing of the hydraulic buffer.

Performance Evaluation of Heat Transfer Tube and Tube Sheet Rubber Ring in Distillation Desalination

2013 ◽  
Vol 777 ◽  
pp. 3-10
Author(s):  
Yan Hui Liu ◽  
Yan Li ◽  
Qing Chun Lv ◽  
Ke Xu ◽  
Ling Pin Zhang
Keyword(s):  
Heat Transfer ◽  
Evaluation Method ◽  
Tube Sheet ◽  
Rubber Material ◽  
Rubber Ring ◽  
Epdm Rubber ◽  
Heat Transfer Tube ◽  
Rates Of Change ◽  
Sealing Performance ◽  
Transfer Tube

Based on the material of EPDM, we develop specialized rubber material for low-temperature multi-effect distillation (LT-MED) conditions. For heat transfer tube and tube sheet connected to the rubber (herein referred as EPDM rubber material) ring are used in the LT-MED desalination equipment, we make regular aging and multivariate synergistic aging test on EPDM. According to the experimental results, we develop an evaluation method applicable to usage of sealing rubber material under LT-MED conditions, and rubber material properties are measured by the changes of mechanical indicators. Finally, we also tested the sealing performance of the sealing rings. The results show that EPDM rubber material can tolerate the LT-MED conditions with the ring boost rate of 0.038kPa/h when the rates of change in Shoer hardness range from-5% to 10%, the rates of change in tensile strength within-20%, the rates of change in elongation at break range from-30% to 10%.

Finite Element Analysis and Simulation of the Sealing Performance of Y-Ring Rubber Seal

2013 ◽  
Vol 444-445 ◽  
pp. 1379-1383 ◽  
Author(s):  
Kai Bo Cui ◽  
Jun Qi Qin ◽  
Chang Chun Di ◽  
Yan Feng Yang
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Von Mises Stress ◽  
Hydraulic Pressure ◽  
Element Analysis ◽  
Rubber Seal ◽  
Seal Failure ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Von Mises

Application of super elasticity theory and nonlinear theory, based on finite element method and the Abaqus software, the performance of Y ring rubber seal, such as the Von Mises stress, the sealing ring deformation and the contact pressure were simulated and analyzed under the influence of changeable hydraulic pressure. According to seal failure criterion, the effect of hydraulic pressure changes on the sealing performance were studied. Results show that, the maximum stress appears in the intersection of lips, the largest deformation area near the inner lip. The root has greater contact pressure, which would result in bitten phenomenon or aggravate wear.

scholarly journals Study on dynamic sealing performance of combined sealing structure of telescopic type of downhole robot by using HTHP coupling method

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110132
Author(s):  
Jianguo Zhao ◽  
Hanxiu Peng ◽  
Shiji Fang ◽  
Kunpeng Wang ◽  
Shuo Han ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Fluid Pressure ◽  
Simulation Method ◽  
Coupling Method ◽  
Stress And Strain ◽  
Hydraulic Pressure ◽  
Load Pressure ◽  
The Real ◽  
Sealing Performance ◽  
Downhole Robot

The sealing performance will directly affect the operation of downhole robot under HTHP condition. Traditional analysis methods of sealing performance are that the temperature and pressure is loaded respectively. This can not really evaluate the sealing performance. Besides, the simulation process is: Step 1: pre-compress O-ring to produce contact force. According to the contact pressure, select the compression ratio to calculate the displacement of the slip ring. Step 2: load fluid pressure on the O-ring. This simulation method is to directly load pressure on the undeformed O-ring. However, the O-ring will deform after pre-compression. Therefore, this simulation method is not accurate. In order to make the simulation data more accurate, calculate the data of shape, stress, and strain of O-ring caused by pre-compression caused by assembly. Then, import the deformation body containing the real data of shape, stress, and strain into a new model. On the basis, establish the numerical simulation model of piston, piston guide rod, O-ring, and FTS-ring with HTHP loads is. Finally, calculate and analyze. When the compression ratio of the O-ring is about 14%, the sealing performance is good. What’s more, the distribution of contact stress and Von Mises of the O-ring at 8.3 mm/s of motion speed are analyzed. The results show that the foot shaped combined sealing structure can keep a good dynamic sealing performance under HTHP condition. This paper provides a theoretical basis for the analysis of the dynamic sealing performance by using HTHP coupling method. In the analysis of sealing performance: the hydraulic pressure is loaded to the real model with the real shape, stress, and strain produced by the O-ring assembly. This can more accurately evaluate the sealing performance under HTHP condition. It also provides a reference for the dynamic sealing structure design of downhole tools.

scholarly journals Fretting Wear of Rubber Sealing Ring Caused by Fluid Pressure Fluctuation

Mechanika ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 321-326
Author(s):  
Yang Hu ◽  
Chuanjun HAN ◽  
Jie ZHANG ◽  
Zixuan LUO
Keyword(s):  
Friction Coefficient ◽  
Compression Ratio ◽  
Contact Region ◽  
Fluid Pressure ◽  
Fretting Wear ◽  
Factors Affecting ◽  
Gas Cylinder ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Slip Region

In the process of gas charging and discharging of gas cylinder, the fluid pressure fluctuates causing fretting wear of rubber sealing ring, which affects the sealing performance. The model of O-ring that installed at the mouth of the gas cylinder was established to study the fretting wear in the static seal. Effects of fluid pressure, compression ratio, friction coefficient and temperature on the fretting wear of the O-ring were considered. The results show that the fretting wear of O-ring can be divided into non-contact region, slip region and sticky region. In the static seal, the compression ratio and friction coefficient are the main factors affecting the fretting wear. The sealing performance is greatly influenced on the compression ratio and it is less affected by the temperature. The junction of slip region and sticky region has the greatest probability of seal failure.

scholarly journals Factors Affecting the Compression and Energy Absorption Properties of Small-Sized Thin-Walled Metal Tubes

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xiaoqin Hao ◽  
Jia Yu ◽  
Weidong He ◽  
Yi Jiang
Keyword(s):  
Energy Absorption ◽  
Simulation Models ◽  
Simulation Method ◽  
Engineering Practice ◽  
Small Ring ◽  
Metal Tube ◽  
Absorption Properties ◽  
Factors Affecting ◽  
Thin Walled ◽  
Hollow Metal

To solve the problem of the effective cushioning of fast-moving mechanical components in small ring-shaped spaces, the factors affecting the compression and energy absorption properties of small-sized hollow metal tubes were studied. Simulation models were constructed to analyse the influences of tube diameter, wall thickness, relative position, and number of stacked components on the compression and energy absorption properties. The correctness of the simulation method and its output were verified by experiments, which proved the effectiveness of compression and energy absorption properties of small-sized thin-walled metal tubes. The research provides support for the application of metal tube buffers in armament launch technology and engineering practice.

Analysis of Packer Rubber Mechanics Properties

2014 ◽  
Vol 971-973 ◽  
pp. 380-389
Author(s):  
Jian Ning Wang ◽  
Gang Wu ◽  
Wei Yi Xie ◽  
Xin De Han ◽  
Ming Chao Gang
Keyword(s):  
Finite Element ◽  
Elastic Modulus ◽  
Constitutive Model ◽  
Contact Stress ◽  
Theoretical Basis ◽  
Element Model ◽  
Rubber Material ◽  
Bottom Hole ◽  
Sealing Performance ◽  
The Finite Element Model

Abstract: The packer rubber stress in the bottom hole is more complex. Based on constitutive model of the packer rubber material, this paper determines such parameters as model constants, Poisson's ratio of rubber materials and elastic modulus by using experimental method, to build up the finite element model of center tube-rubber cylinder-casing for the purpose of stress analysis. Finally, the distribution regularity of rubber cylinder-casing contact stress and packer setting travel distance with varying loads is concluded. The results can provide the theoretical basis for further analysis of packer rubber sealing performance.

Dynamic failure analysis of static seals under pressure fluctuation in an ultrahigh-pressure water piston pump

2021 ◽  
pp. 095440622110520
Author(s):  
Qian Cheng ◽  
Yinshui Liu ◽  
Zhenyao Wang ◽  
Defa Wu ◽  
Yunxiang Ma
Keyword(s):  
Element Model ◽  
Piston Pump ◽  
Ultrahigh Pressure ◽  
Maximum Pressure ◽  
Seal Ring ◽  
Face Seal ◽  
Dynamic Failure ◽  
Rubber Material ◽  
The Face ◽  
Sealing Ring

For ultrahigh-pressure piston pumps, in the reciprocating action of the piston, the fretting between the static face seal and the mating surface occurs with the change of the pressure in the piston chamber. This phenomenon will seriously affect the service life of the seal ring and lead to the failure of the pump. However, the failure of static seals used to seal ultrahigh-pressures is usually studied from the directions of shear, stress, or rubber material. These studies cannot explain the failure phenomenon of the sealing ring found in our experiment. This paper analyzed the failure of the face seal ring in a piston pump with a maximum pressure of 120 MPa. A two-dimensional axisymmetric finite element model was established based on the Mooney-Rivlin constitutive relation of the rubber material, and the fretting conditions of the sealing ring were analyzed. Combined with the wear scars observed by the scanning electron microscope the face seal ring’s dynamic failure mechanism on the ultrahigh-pressure piston pump was determined. A better sealing scheme was proposed and verified by the duration test of the pump, which provided a basis for the design of the sealing of the ultrahigh-pressure fluid with high-frequency fluctuations.

Study on the critical loosening condition toward a new design guideline for bolted joints

2018 ◽  
Vol 233 (9) ◽  
pp. 3302-3316 ◽  
Author(s):  
Hao Gong ◽  
Jianhua Liu ◽  
Xiaoyu Ding
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Simulation Method ◽  
Bolted Joints ◽  
Design Guideline ◽  
Factors Affecting ◽  
Dimensional Finite Element ◽  
Frictional Coefficients ◽  
Three Dimensional Finite Element ◽  
Fit Tolerance

An understanding of conditions that trigger the loosening of bolted joints is essential to ensure joint reliability. In this study, a three-dimensional finite element model of a typical bolted joint is developed, and a new simulation method is proposed to quantitatively identify the critical transverse force for initiating loosening. This force is used to evaluate the anti-loosening capacity of bolted joints. Using the proposed simulation method, the effects of factors affecting critical loosening are systematically studied. It is found that the preload, frictional coefficients at the thread and the bearing surfaces, clamped length, and fit tolerance mainly affected loosening. When the preload and friction coefficients are increased, and the clamped length and fit tolerance are reduced, loosening is inhibited. Experiments are performed to demonstrate the reliability of the results. Finally, a suggestion is proposed to improve the design guideline VDI 2230 for bolted joints, which considers the requirement of avoiding loosening under vibrational loading.

scholarly journals FEM Analysis for Sealing Performance of Hydraulic Pressure Brake Hose Caulking Portion

2011 ◽  
Vol 5 (9) ◽  
pp. 484-494 ◽  
Author(s):  
Nao-Aki NODA ◽  
Shinpei YOSHIMURA ◽  
Hirofumi KAWAHARA ◽  
Masakazu TSUYUNARU
Keyword(s):  
Fem Analysis ◽  
Hydraulic Pressure ◽  
Sealing Performance

scholarly journals A Simulation Model for Computing the Loads Generated at Landing Site During Helicopter Take-Off or Landing Operation

2019 ◽  
Vol 2019 (2) ◽  
pp. 59-75
Author(s):  
Jarosław Stanisławski
Keyword(s):  
Equations Of Motion ◽  
Landing Site ◽  
Simulation Method ◽  
Rigid Bodies ◽  
Landing Gear ◽  
Rotor Blades ◽  
Wind Gust ◽  
The Galerkin Method ◽  
Lumped Masses ◽  
And Control

Summary The paper presents simulation method and results of calculations determining behavior of helicopter and landing site loads which are generated during phase of the helicopter take-off and landing. For helicopter with whirling rotor standing on ground or touching it, the loads of landing gear depend on the parameters of helicopter movement, occurrence of wind gusts and control of pitch angle of the rotor blades. The considered model of helicopter consists of the fuselage and main transmission treated as rigid bodies connected with elastic elements. The fuselage is supported by landing gear modeled by units of spring and damping elements. The rotor blades are modeled as elastic axes with sets of lumped masses of blade segments distributed along them. The Runge-Kutta method was used to solve the equations of motion of the helicopter model. According to the Galerkin method, it was assumed that the parameters of the elastic blade motion can be treated as a combination of its bending and torsion eigen modes. For calculations, data of a hypothetical light helicopter were applied. Simulation results were presented for the cases of landing helicopter touching ground with different vertical speed and for phase of take-off including influence of rotor speed changes, wind gust and control of blade pitch. The simulation method may help to define the limits of helicopter safe operation on the landing surfaces.

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