The Simulation Research of Dual Clutch Transmission's Starting Process Based on Dynamic Friction Coefficient

2013 ◽  
Vol 401-403 ◽  
pp. 320-325
Author(s):  
Ming Ming Qiu ◽  
Han Zhao ◽  
Fa Ming Sha
Keyword(s):  
Friction Coefficient ◽  
Vibration Analysis ◽  
Working Condition ◽  
Static Friction ◽  
Dynamic Friction ◽  
Simulation Research ◽  
Static Friction Coefficient ◽  
Dynamic Friction Coefficient ◽  
Friction Plate ◽  
Starting Process

Introduce the dynamic friction coefficient of clutch friction plate. Establish Mathematical model of starting process, carried out vibration analysis for frictional sliding process systematically, validated the analysis using Matlab/simulink software. Meanwhile, compared with the starting process by static friction coefficient. The results show that using dynamic friction coefficient to analyse starting process conforms to the actual working condition.

Experimental investigation and prediction method of fretting wear in rack-plane spline couplings

2020 ◽  
pp. 135065012093983
Author(s):  
Xiangzhen Xue ◽  
Jipeng Jia ◽  
Qixin Huo ◽  
Junhong Jia
Keyword(s):  
Friction Coefficient ◽  
Wear Mechanism ◽  
Static Friction ◽  
Experimental Results ◽  
Fretting Wear ◽  
Accurate Estimation ◽  
Dynamic Friction ◽  
Static Friction Coefficient ◽  
Dynamic Friction Coefficient ◽  
Involute Spline

To investigate the fretting wear of involute spline couplings in aerospace, rack-plane spline couplings rather than the conventional involute spline couplings in aerospace were used to conduct tribological experiments, and it was assumed that the rack-plane spline couplings exhibit consistent contact stress with the real involute spline couplings in aerospace. The relationships among the static friction coefficient, dynamic friction coefficient, and fretting friction coefficient were established via tribological experiments, as well as the fretting-wear mechanism of the rack-plane spline couplings was examined. A fretting-wear estimation model based on the fretting-wear mechanism was developed. By applying the modified Archard equation and Arbitrary Lagrangian–Eulerian adaptive, mesh smoothing algorithm of Abacus was used. According to our experimental results, the fretting wear of the rack-plane spline couplings consisted primarily of abrasive wear, oxidative wear, and adhesive wear. For both, lubrication and non-lubrication settings, the fretting friction coefficient of 18CrNi4A steel (0.27) fluctuated between 0.12 (dynamic friction coefficient) and 0.35 (static friction coefficient). The fretting-wear results estimated via numerical prediction were consistent with the experimental results. When sm (vibration amplitude) was 20, 35, and 50 µm, the most difference in the fretting wear between the experimental results and numerical estimation was 0.001, 0.0007, and 0.001 mm, respectively. Therefore, the proposed model provides a method for accurate estimation of the fretting-wear. Additionally, the model contributes to the precise design of involute spline couplings in aerospace.

New Methodology for the Life Time Prediction of Wear Parts in the Mechatronic Systems

2017 ◽  
Vol 260 ◽  
pp. 194-201
Author(s):  
Oskars Linins ◽  
Irina Boiko ◽  
Janis Lungevics ◽  
Armands Leitans
Keyword(s):  
Friction Coefficient ◽  
Life Time ◽  
Static Friction ◽  
Engineering Calculation ◽  
Dynamic Friction ◽  
Mechatronic Systems ◽  
Time Prediction ◽  
Dynamic Friction Coefficient ◽  
Texture Parameters ◽  
3D Surface Texture

This paper is devoted to the elaboration and verification of the new methodology for the life time prediction of wear parts in the mechatronic systems. The methodology is based on the using of the 3D surface texture parameters instead of 2D roughness parameters for more precise prediction of the life time of machine parts.Experimental testing of proposed methodology for the wear parts of linear motion modules of mechatronic system was done using 3D profilometry, pin-on-disc tribological testing for determination dynamic friction coefficient, slidability and static friction coefficient measurements. The new approach for life time prediction is based on using following 3D texture parameters: Sa, Sq, Str, Rsm1 and Rsm2. It is established, that the amplitude and spatial parameters (Sa and Str (Rsm1) accordingly) have a most significant influence on the static and dynamic friction coefficient as well as on the sliding properties. It can be assumed, that for wear parts and for improving sliding properties the surfaces with less Sa and bigger Rsm1 are recommended.Within the Ti-based multi-layer PVD coatings the best prognosis for the life time was achieved for the samples with multi-layer Ti-TiN-Al PVD coating. Proposed methodology is acceptable for use in practice of engineering calculation, in design etc.

Research on the Mechanical Properties of Pure Stainless Fiber and its Effect on Textile Processing

2011 ◽  
Vol 332-334 ◽  
pp. 824-827
Author(s):  
Yu Chai Sun ◽  
Zhong Hao Cheng ◽  
Yan Mei Zhang
Keyword(s):  
Friction Coefficient ◽  
Breaking Strength ◽  
Static Friction ◽  
Textile Fiber ◽  
Textile Processing ◽  
Temperature Resistance ◽  
Static Friction Coefficient ◽  
Dynamic Friction Coefficient ◽  
High Efficient ◽  
Industrial Textiles

Pure stainless fiber products have many excellent properties such as high temperature resistance, resistance to corrosion, high efficient filter etc.. Pure stainless fabrics are getting wider range of application in the field of industrial textiles. The property differences between stainless fiber and common textile fiber made the textile processing of stainless yarn difficult. Based on the testing of dynamic friction coefficient, static friction coefficient, breaking strength and breaking elongation, this paper analyzes the main performance characteristic of stainless fiber and the reasons that makes textile processing difficult. Countermeasures for fabric manufacturing are suggested accordingly.

scholarly journals Bolted Joint Preload Distribution from Torque Tightening

2021 ◽  
Vol 71 (2) ◽  
pp. 329-342
Author(s):  
Welch Michael
Keyword(s):  
Friction Coefficient ◽  
Static Friction ◽  
Bolted Joints ◽  
Dynamic Friction ◽  
Bolted Joint ◽  
Classical Analysis ◽  
Joint Design ◽  
Static Friction Coefficient ◽  
Bolt Preload ◽  
Torque Wrench

Abstract The purpose of this paper is to develop an understanding of how bolt preloads are distributed within a joint as each bolt is tightened in turn by the use of a calibrated torque wrench. It discusses how the order that the joints nuts/bolts are tightened can affect the final bolt preload. It also investigates the effect on incrementally increasing the bolt preload through a series of applications of the controlled torque tightening sequence. Classical analysis methods are used to develop a method of analysis that can be applied to most preloaded bolted joints. It is assumed that the static friction coefficient is approximately 15% less than the dynamic friction. It is found that the bolt preload distribution across the joint can range from slightly above the target preload to significantly less than the target preload. The bolts with a preload greater than the target preload are found to be those tightened towards the end of the tightening sequence, usually located close to the outer edges of the joint’s bolt array. The bolts with a preload less than the target preload are those tightened early in the tightening sequence, located centrally within the joints bolt array. The methods presented can be used to optimise bolted joint design and assembly procedures. Optimising the design of preloaded bolted joints leads to more efficient use of the joints.

scholarly journals The Influence of Hydrothermal Aging on the Dynamic Friction Model of Rubber Seals

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 102
Author(s):  
Jian Wu ◽  
Hang Luo ◽  
Haohao Li ◽  
Benlong Su ◽  
Youshan Wang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Coulomb Friction ◽  
Dynamic Performance ◽  
Static Friction ◽  
Friction Model ◽  
Dynamic Friction ◽  
Hydrothermal Aging ◽  
Static Friction Coefficient ◽  
Sealing Ring ◽  
Friction Performance

Cylinder has become an indispensable and important pneumatic actuator in the development of green production technology. The sealing performance of the cylinder directly affects its safety and reliability. Under the service environment of the cylinder, hydrothermal aging of the rubber sealing ring directly affects the dynamic friction performance of the cylinder. So, the dynamic friction model of the cylinder has been developed based on the LuGre friction model, which considers the influence of hydrothermal aging. Here, the influences of the static friction coefficient and Coulomb friction coefficient on the friction model are analyzed. Then, the aging characteristic equation of rubber is embedded in the model for revealing the influence of aging on the friction coefficient of the model. Results show that the aging temperature, aging time, and compressive stress affects the friction coefficient; the variation of the static friction coefficient is larger than that of the Coulomb friction coefficient. The improved cylinder friction model can describe the influence of the aging process on the cylinder friction characteristics, which is of great significance in the design of the cylinder’s dynamic performance.

Mechanical Properties of Structural Chuan-Dou Style Wooden Structure

2014 ◽  
Vol 1008-1009 ◽  
pp. 1213-1217
Author(s):  
Jun Wei Wang ◽  
Guan Feng Qiao ◽  
Qing Fang Niu ◽  
Tie Ying Li
Keyword(s):  
Friction Coefficient ◽  
Seismic Performance ◽  
Mechanical Response ◽  
Static Friction ◽  
Analysis Software ◽  
Element Analysis ◽  
Static Friction Coefficient ◽  
Wooden Structure ◽  
Dynamic Friction Coefficient ◽  
The Finite Element Analysis

In this paper, use the finite element analysis software ABAQUS to firstly analyze the mechanical response to simplified model of Chuan-dou type wooden structure under its own weight, followed by the analysis of the structure under horizontal reciprocating loading, and finally seismic performance analysis of the structure under earthquake. Use the same contact properties between the members, and the differences between dynamic friction coefficient and static friction coefficient are not distinguished. The results show that the wooden structure of ancient houses has good seismic performance, which is mainly achieved by the frame deformation and friction slip.

scholarly journals A Simple Mechanistic Model for Friction of Rough Partially Lubricated Surfaces

2021 ◽  
Vol 69 (3) ◽  
Author(s):  
Gianluca Costagliola ◽  
Tobias Brink ◽  
Julie Richard ◽  
Christian Leppin ◽  
Aude Despois ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Mechanistic Model ◽  
Applied Pressure ◽  
Real Contact Area ◽  
Experimental Measurements ◽  
Dynamic Friction ◽  
Real Contact ◽  
Dynamic Friction Coefficient ◽  
Direct Measurements

AbstractWe report experimental measurements of friction between an aluminum alloy sliding over steel with various lubricant densities. Using the topography scans of the surfaces as input, we calculate the real contact area using the boundary element method and the dynamic friction coefficient by means of a simple mechanistic model. Partial lubrication of the surfaces is accounted for by a random deposition model of oil droplets. Our approach reproduces the qualitative trends of a decrease of the macroscopic friction coefficient with applied pressure, due to a larger fraction of the micro-contacts being lubricated for larger loads. This approach relates direct measurements of surface topography to realistic distributions of lubricant, suggesting possible model extensions towards quantitative predictions.

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