Tribological Analysis of Engine Valve Train Performance Considering Effects of Lubricant Formulation / (Record no. 610595)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03523nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 621 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Khurram, Muhammad |
| 245 ## - TITLE STATEMENT | |
| Title | Tribological Analysis of Engine Valve Train Performance Considering Effects of Lubricant Formulation / |
| Statement of responsibility, etc. | Muhammad Khurram |
| 264 ## - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE | |
| Place of production, publication, distribution, manufacture | Islamabad : |
| Name of producer, publisher, distributor, manufacturer | SMME- NUST; |
| Date of production, publication, distribution, manufacture, or copyright notice | 2016. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 225p. |
| Other physical details | Soft Copy |
| Dimensions | 30cm |
| 500 ## - GENERAL NOTE | |
| General note | Fuel economy, reduction in power losses and control on emissions are the key drivers<br/>of the automotive industry. Development of new technologies and lubricant formulation is<br/>being pursued relentlessly to improve the engine performance. This in turn demands<br/>comprehensive experimental work based on reliable and accurate measurement system to<br/>analyze the effectiveness of these technologies. In roller follower valve train configuration,<br/>the power losses and deterioration of mating surfaces of cam and roller is largely governed by<br/>the sliding of rollers and lubrication conditions at cam/roller interface whereas the different<br/>operating conditions, lubricant rheology/chemistry can play an extremely important role in<br/>this context.<br/>In this research project, an advanced real production gasoline engine having end<br/>pivoted roller finger follower valve train has been instrumented, for the very first time, by<br/>employing the recently developed techniques based on advanced sensor technology to<br/>measure the rollers tribological behavior and oil film thickness at cam/roller interface under<br/>realistic environment. An elaborated experimental research work comprising of series of tests<br/>has been undertaken to investigate the effects of different operating conditions, oil rheology,<br/>lubricant chemistry and low viscosity oil on these important parameters. A new flexible test<br/>rig has been designed and developed whereas a high speed synchronized data acquisition<br/>system has been employed to hunt for the vital information. A numerical approach based on<br/>the lubrication and friction modeling is also the part of this research work to understand the<br/>tribological characteristics of the valve train and to predict various important tribological<br/>parameters.<br/>The experimental results showed that due to shear drag it was not necessary for roller<br/>rotational speed to increase with camshaft speed. The lubricant viscosity played a key role in<br/>the roller sliding at lower temperatures however at higher oil temperatures negative slip was<br/>also observed indicating that component inertia and internal friction have a role to play in<br/>roller slip. Relatively, higher magnitude of roller sliding was observed for mineral oil as<br/>compared to synthetic oil having almost same viscosity while operating under similar<br/>conditions. Good lubrication conditions were also observed at cam/roller interface due to<br/>dominance of rolling motion. Increase of roller sliding with corresponding rise in oil film<br/>thickness was recorded. A good agreement between the theoretical predictions and<br/>experimental evidences was also found. It is strongly believed that the obtained realistic data<br/>will provide greater flexibility in validating the predictive mathematical models on the valve<br/>iii<br/>trains and will be extremely beneficial for the engine designers and lubricant formulators in<br/>their ongoing efforts to improve the engine tribological efficiency. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | PhD in Mechanical Engineering |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Supervisor : Prof. Dr. Riaz Ahmed Mufti |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://10.250.8.41:8080/xmlui/handle/123456789/13176">http://10.250.8.41:8080/xmlui/handle/123456789/13176</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Thesis |
| Withdrawn status | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Koha item type |
|---|---|---|---|---|---|---|---|
| School of Mechanical & Manufacturing Engineering (SMME) | School of Mechanical & Manufacturing Engineering (SMME) | E-Books | 07/26/2024 | 621 | SMME-Phd-2 | Thesis |