An Optimum Connecting Rod Design Study—A Lubrication Viewpoint

1986 ◽  
Vol 108 (3) ◽  
pp. 487-493 ◽  
Author(s):  
Pawan K. Goenka ◽  
Kong Ping Oh
Keyword(s):  
Structural Design ◽  
Gasoline Engine ◽  
Peak Pressure ◽  
Elastohydrodynamic Lubrication ◽  
Connecting Rod ◽  
Support Structure ◽  
Design Changes ◽  
Percent Improvement ◽  
Octahedral Shear Stress ◽  
Effect Of Support

The effect of support structure on the performance of a connecting rod bearing is analyzed by elastohydrodynamic lubrication theory. The support structure is modified iteratively until an optimum design is obtained. With the connecting rod of a typical gasoline engine as an example, it was found that a 150 percent improvement in film thickness and a 34 percent reduction in peak pressure can be obtained by changing the structural design. This design, however, increases the peak octahedral shear stress in the rod. Structural design changes considered were found to have surprisingly little effect on the power loss of the bearing.

scholarly journals Estimation of Aerodynamic Load on Radome Structure Mounted on Top of a Surveillance Aircraft

2020 ◽  
Vol 9 (3) ◽  
pp. 1969-1973
Keyword(s):  
Wind Tunnel ◽  
Pressure Distribution ◽  
Structural Design ◽  
Pressure Transducer ◽  
Dorsal Side ◽  
Aerodynamic Load ◽  
Aerodynamic Forces ◽  
Support Structure ◽  
Aerodynamic Angles ◽  
Valve Pressure

The design and development of radome external structure, requires aerodynamic forces acting on it and its distribution. This paper discusses the wind tunnel studies carried out for estimating the incremental effects due to the installation of large ellipsoidal radome along with the support structure pylons on the dorsal side of the fuselage. Effect of locations of radome at 36 m and 31.5 m from the nose of the fuselage is discussed. Further using the scan-valve pressure transducer, the pressure distribution on the radome measured at different aerodynamic angles required for the structural design of radome structure is also brought out. Flow visualization study which are useful for qualitative check for the effect of installation of the radome with support structure on the effectiveness of the empennage is attempted.

Cross-Deck Slamming Load Calculation of Trimaran Based on Modified Plate Slamming Theory

2013 ◽  
Vol 477-478 ◽  
pp. 325-329 ◽  
Author(s):  
Hui Long Ren ◽  
Liang Liang Chen ◽  
Guo Qing Feng ◽  
Fang Duan ◽  
Peng Yao Yu
Keyword(s):  
Spatial Distribution ◽  
Calculation Method ◽  
Structural Design ◽  
Peak Pressure ◽  
Added Mass ◽  
Preliminary Design ◽  
Statistical Process ◽  
Load Calculation ◽  
Slamming Load ◽  
Air Cushion

Since slamming loads on connecting bridges of trimaran is very important for the structural design. In this paper, trimaran slamming load calculation method is studied. First added mass caused by typical hull section and wet-deck slamming are investigated, then wet-deck slamming peak pressure are gotten by modified flat slamming theory with considered of the effect of air cushion, the regression equation of which is given by statistical process. Finally, the time-spatial distribution of slamming pressure along the wet-deck is given. This method can provide a reference for the preliminary design and operation of trimaran.

The Effects of Surface Irregularities on the Elastohydrodynamic Lubrication of Sliding Line Contacts. Part II—Wavy Surfaces

1984 ◽  
Vol 106 (1) ◽  
pp. 113-119 ◽  
Author(s):  
P. R. Goglia ◽  
C. Cusano ◽  
T. F. Conry
Keyword(s):  
Shear Stress ◽  
Film Thickness ◽  
Smooth Surface ◽  
Wave Amplitude ◽  
Elastohydrodynamic Lubrication ◽  
Wavy Surface ◽  
Line Contacts ◽  
Surface Irregularities ◽  
Wavy Surfaces ◽  
Octahedral Shear Stress

The micro-EHD effects caused by wavy surfaces have been analytically investigated. The investigation includes the effects of phase, wavelength, and wave amplitude on film thickness, pressure distribution and subsurface octahedral shear stress field. The presence of a wavy surface with a given wavelength produces pressure oscillations of the same wavelength. With increasing wave amplitude and decreasing wavelength, the micro-EHD action increases. This results in a maximum value of the octahedral shear stress which is greater in magnitude and closer to the surface than the corresponding smooth surface case. The slope of the wavy surface in the inlet region determines whether the average film thickness is smaller or larger than the smooth surface value.

Structural Design Changes as a Solution to a Resonance Fatigue Problem of a Sports Car

1993 ◽  
Author(s):  
Herman Van der Auweraer ◽  
Christophe Liefooghe ◽  
Jan Leuridan ◽  
Paul Sas
Keyword(s):  
Structural Design ◽  
Design Changes

Exploratory design using constraints

1987 ◽  
Vol 1 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Weng Tat Chan ◽  
Boyd C. Paulson
Keyword(s):  
Structural Design ◽  
Computer Aided Design ◽  
Design Solution ◽  
Simple Scheme ◽  
Dual Nature ◽  
Design Changes ◽  
Heuristic Procedures ◽  
Rules Of Thumb ◽  
Design Consistency ◽  
Aided Design

Engineering design involves the evaluation and satisfaction of a wide variety of constraints. The ability to represent and process these constraints in a computer is important for the verification of the output produced by computer-aided design programs. Constraints need not only check designs but can also be used to derive design solution s that satisfy constraints. The paper discusses how to represent the dual nature of constraints so that design consistency is maintained as the design evolves.Assumptions and rules of thumb are used frequently in design to propose initial solutions. We represent the logic behind the derivation of these assumptions as heuristic procedures and maintain the dependencies between these assumptions and their consequents as an aid to the management of design consistency. We also propose a simple scheme, involving the partitioning of the design modules, to effect design changes when constraint violations occur. An example from structural design illustrates the methodology.

Experimental Evaluation of Piston Assembly Friction Under Motored and Fired Conditions in a Gasoline Engine

2004 ◽  
Author(s):  
Riaz A. Mufti ◽  
Martin Priest
Keyword(s):  
Gasoline Engine ◽  
Operating Conditions ◽  
Cylinder Pressure ◽  
Connecting Rod ◽  
Friction Modifier ◽  
Indicated Mean Effective Pressure ◽  
Axial Forces ◽  
The Difference ◽  
Digital Channels ◽  
Piston Assembly

Piston assembly friction measurement has been carried out on a single cylinder gasoline engine using the IMEP (indicated mean effective pressure) method at realistic engine speeds and loads without any major engine modifications. Instantaneous and mean piston assembly friction were measured under motored and fired conditions at different lubricant temperatures. The forces acting on the piston assembly were carefully determinated by measuring the cylinder pressure, crankshaft angular velocity and strain in the connecting rod. The difference between the resulting gas pressure, inertia and connecting rod axial forces acting on the piston yields the piston assembly friction. To achieve this with confidence, an advanced instrumentation, telemetry and data acquisition system was designed and developed, giving special attention to the synchronisation and simultaneous sampling of analogue and digital channels. Experiments are reported for piston assembly friction at a range of engine operating conditions with different lubricant formulations, with and without a friction modifier.

scholarly journals A Study on Optimum Structural Design of Big End and Serration of Connecting Rod

1981 ◽  
Vol 16 (6) ◽  
pp. 488-498
Author(s):  
Takeshi Takao ◽  
Hirohiko Fujihara ◽  
Mitsuhiro Kinugawa ◽  
Isamu Shimizu
Keyword(s):  
Structural Design ◽  
Connecting Rod ◽  
Optimum Structural Design
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