scholarly journals The Effect of Wear on the Performance of a Rotary Lip Seal

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Fei Guo ◽  
Xiaohong Jia ◽  
Wang Longke ◽  
Richard F. Salant ◽  
Yuming Wang
Keyword(s):  
Theoretical Analysis ◽  
Experimental Verification ◽  
Experimental Measurement ◽  
Friction Torque ◽  
Measuring Instrument ◽  
Optical Interferometer ◽  
Pumping Rate ◽  
Lip Seal ◽  
Surface Microtopography ◽  
Sealing Zone

Theoretical analysis, combined with experimental verification, is used to study the effect of wear on the performance of a rotary lip seal as characterized by the pumping rate and friction torque. The performance of a rotary lip seal is determined by the sealing lip surface microscopic characteristics and contact characteristics at the sealing zone. The variation of the contact characteristics with wear has been established based on the variation of the sealing lip profiles measured by using a trilinear coordinate measuring instrument. The impression method is used to copy the lip surface microtopography at different wear times and then an optical interferometer is used to measure the impression surface microtopography to obtain the variation of roughness with wear. The variations of the roughness, contact characteristics, and approximate contact temperature with wear are inserted into a mixed lubrication model to obtain the variations of the pumping rate and friction torque. A comparison of the simulated results with those from experimental measurement verifies the validity of the theoretical analysis.

scholarly journals Numerical Simulation and Experimental Study on Sealing Performance and Frictional Property of Rotary Lip Seal

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Huifang Dong ◽  
Jian Hu
Keyword(s):  
Friction Pair ◽  
Solution Process ◽  
Friction Torque ◽  
Contact Load ◽  
Necessary Condition ◽  
Bench Test ◽  
Frictional Property ◽  
Pumping Rate ◽  
Lip Seal ◽  
Sealing Performance

The hydrodynamic theoretical lubrication model of the friction pair between the rotary shaft and the lip seal under the state of full film lubrication was established in this paper. The Reynolds equation was solved by using the finite difference method, and the influence of the viscosity-temperature characteristics of the lubricant was taken into account in the solution process. The distribution of the film thickness and the hydrodynamic pressure in the sealing area was obtained. At the same time, the bench test was carried out and the correctness of the model was verified by comparing the simulation results and test results of reverse pumping rate and friction torque under different rotational speed of the shaft. The microasperity of the lip surface is a necessary condition for achieving the sealing effect. Therefore, the influences of the contact load of the seal and the root mean square deviation of the lip surface on the sealing performance and frictional property were analyzed by using the theoretical model. The analysis results show that the sealing performance and frictional property can be changed by changing the contact load and surface roughness of the lip, but a single increase in the influence of a certain factor cannot achieve good results, and comprehensive consideration is required in product design.

Influence of Additives in Synthetic Oils on Radial Lip Seals

2011 ◽  
Author(s):  
Mathias Klaiber ◽  
Werner Haas
Keyword(s):  
Friction Torque ◽  
Operating Conditions ◽  
Functional Tests ◽  
Dynamic Tests ◽  
Pumping Rate ◽  
Base Oil ◽  
Lip Seal ◽  
Lip Seals ◽  
Elastomeric Materials ◽  
Points Of View

This project has been initiated in order to get a general basic understanding about the influence of additives onto elastomeric lip seal systems. It is necessary to determine the behavior with single additive base oil compounds. Two different synthetic base oils, Polyglycol (PG) and Polyalphaolefin (PAO), are used. Thus 19 different single additive base oil compounds have been reviewed. Two different elastomeric materials NBR and FPM have been taken for all the tests. In several dynamic tests the influences on the sealing systems have been investigated. These included tests for 24 hours to measure the friction torque and tests for 10 hours to measure the pumping rate. Furthermore, the operating conditions during 96 hours functional tests have been determined. A concluding view onto the compatibility, respectively the incompatibility, of the additives in these different points of view will be given.

Theoretical analysis and experimental verification of the improved subsurface drainage discharge with ponded water

2019 ◽  
Vol 213 ◽  
pp. 546-553 ◽  
Author(s):  
Yuan Tao ◽  
Shaoli Wang ◽  
Di Xu ◽  
Xiaoyan Guan ◽  
Mengzhe Ji ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Experimental Verification ◽  
Subsurface Drainage

Hydrodynamic Analysis of the Flow in a Rotary Lip Seal Using Flow Factors

2004 ◽  
Vol 126 (1) ◽  
pp. 156-161 ◽  
Author(s):  
Richard F. Salant ◽  
Ann H. Rocke
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Reynolds Equation ◽  
Present Approach ◽  
Operating Parameters ◽  
Pumping Rate ◽  
Hydrodynamic Analysis ◽  
Lip Seal ◽  
Lubricating Film ◽  
Computationally Intensive

The flow field in the lubricating film of a rotary lip seal is analyzed numerically by solving the Reynolds equation with flow factors. The behavior of such a flow field is dominated by the asperities on the lip surface. Since previous analyses treated those asperities deterministically, they required very large computation times. The present approach is much less computationally intensive because the asperities are treated statistically. Since cavitation and asperity orientation play important roles, these are taken into account in the computation of the flow factors. Results of the analysis show how the operating parameters of the seal and the characteristics of the asperities affect such seal characteristics as the pressure distribution in the film, the pumping rate and the load support.

Efficient Transport Bindings for Web Service Messages

2011 ◽  
pp. 83-109
Author(s):  
Christian Werner ◽  
Carsten Buschmann ◽  
Tobias Jäcker ◽  
Stefan Fischer
Keyword(s):  
Theoretical Analysis ◽  
Web Service ◽  
Mobile Communication ◽  
Experimental Measurement ◽  
User Interaction ◽  
Low Latency ◽  
Ip Multicast ◽  
Measurement Results ◽  
Efficient Communication ◽  
Latency Analysis

Although Web service technology is being used in more and more distributed systems, its areas of application are inherently limited by high latencies and high amounts of protocol overhead. For messaging in environments with user interaction, like Web platforms for business or multimedia applications, the response time of the whole system needs to be kept in tight boundaries. In other scenarios comprising mobile communication and battery-powered devices, bandwidth-efficient communication is imperative. In this chapter we address both of these issues. First we conduct a detailed latency analysis of different transport mechanisms for SOAP and then we thoroughly investigate their protocol overhead. For both aspects we present a theoretical analysis as well as experimental measurement results. We then will introduce a new transport binding called PURE that significantly reduces the protocol overhead while featuring low latency. Furthermore it enables interesting additional features such as point-to-multipoint communication via IP multicast and broadcast.

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