Research on the Influence of Bench Installation Conditions on Simulation of Engine Main Bearing Load

2009 ◽  
Vol 2 (1) ◽  
pp. 1885-1890 ◽  
Author(s):  
Shu Gequn ◽  
Li Min ◽  
Wei Haiqiao
Keyword(s):  
Main Bearing ◽  
Bearing Load

Study on Hysteretic Model and Damage Model of Multi-Ribbed Composite Wall

2006 ◽  
Vol 302-303 ◽  
pp. 644-650
Author(s):  
Quan Yuan ◽  
Qian Feng Yao ◽  
Ying Jie Jia
Keyword(s):  
Seismic Behavior ◽  
Structural Engineering ◽  
Damage Model ◽  
Hysteretic Model ◽  
Main Bearing ◽  
Seismic Properties ◽  
Concrete Members ◽  
Bearing Load ◽  
Composite Wall ◽  
Composite Walls

The use of composite materials in structural engineering is recent, and researchers need to investigate their behavior features. A new unit of multi-ribbed composite wall is introduced. A multi-ribbed composite wall is the main bearing-load member in multi-ribbed slab structures (MRSS). The bearing-load characteristics and seismic properties of the wall are different from those of other ordinary concrete members In order to study seismic behavior and durability of Multi-ribbed composite walls, experiments of 26 pieces of composite walls under cyclic loading were carried out, and then the hysteretic model of shear force–shear deformation is established. The hysteretic curves of typical composite walls are calculated. The calculated curves agree well with the experimental ones. The damage model is quantified. This study introduces a quantitative analysis means for evaluating seismic behavior aspects of damage and durability of multi-ribbed composite walls.

Statically Indeterminate Main Bearing Load Calculation in Frequency Domain for Usage in Early Concept Phase

2012 ◽  
Author(s):  
Tigran Parikyan ◽  
Thomas Resch
Keyword(s):  
Frequency Domain ◽  
Combustion Engine ◽  
Main Bearing ◽  
Engine Model ◽  
Bearing Load ◽  
3D Engine ◽  
Bearing Loads ◽  
And Performance ◽  
Engine Development ◽  
Early Concept Phase

The paper discusses the importance of a numerical method for fast and accurate prediction of main bearing loads of inner combustion engine and its place in the concept phase of engine development process. An approach based on linear dynamic analysis of 3D engine model in frequency domain is presented. Implemented within a separate module of AVL software package EXCITE Designer, it delivers a combination of accuracy and performance suitable for this task. An application example illustrates the method.

Assessment of SYMS Survival Limit for “Peng Bo” FPSO During Installation

2010 ◽  
Author(s):  
Amal C. Phadke ◽  
Shihwei Liao ◽  
Donghui Chen
Keyword(s):  
Storm Event ◽  
Bohai Bay ◽  
Mooring System ◽  
Main Bearing ◽  
Restoring Force ◽  
Analysis Methodology ◽  
Rigid Frame ◽  
Bearing Load ◽  
Temporary Support ◽  
Ballast Tanks

The ConocoPhillips “Peng Bo” FPSO in Bohai Bay, China, is one of the largest FPSOs in the world. It was installed in early 2009 and first oil was achieved in May 2009. The FPSO is moored to a jacket platform in about 27m water depth via a Soft Yoke Mooring System (SYMS). The mooring system consists of two yoke arms (port and starboard) connected at the jacket end to a turn-table that sits on a main bearing at the top of the jacket. The other ends of the yoke arms are integrated with two large ballast tanks which are attached to two pendulums supported by a rigid frame mounted on the forward end of the FPSO. The ballast weights give rise to the necessary system surge restoring force while the turntable and bearing allow the FPSO to weathervane. The yoke arms and ballast tanks are pre-installed with empty ballast tanks mounted on two temporary support barges while awaiting the arrival of the FPSO. Upon arrival, the ballast tanks are attached to the pendulums from the FPSO side. The tanks are then filled with solid concrete ballast to achieve the design weight. Before the tanks are completely filled, the SYMS may not have sufficient restoring force in partially filled condition to prevent excessive pitching of the yoke arms and severe bearing load on the jacket beyond the design limit due to large FPSO offset in the event of an unforeseen storm event. An analysis was carried out to estimate the maximum bearing load and yoke arm pitch angle when the ballast tanks were 0%, 25%, 50%, and 75% full for 10-year and 100-year return period events. This paper describes the analysis methodology and results from the analysis. The overall project and installation experience are also discussed.

A Characteristic Parameter to Estimate the Optimum Counterweight Mass of Symmetric In-Line Engines

2004 ◽  
Vol 126 (3) ◽  
pp. 645-655 ◽  
Author(s):  
R. Stanley ◽  
D. Taraza
Keyword(s):  
Engine Speed ◽  
Characteristic Parameter ◽  
Operating Conditions ◽  
Inertia Force ◽  
Maximum Pressure ◽  
Pressure Force ◽  
Main Bearing ◽  
Transition Speed ◽  
Bearing Load ◽  
Bearing Loads

Dimensionless relationships that estimate the maximum bearing load of two symmetric in-line engines have been developed. These relationships were empirically determined by averaging the maximum bearing loads of several engine configurations with various geometric and operating parameters. It has been found that the maximum bearing load initially decreases with engine speed, reaches a minimum, and then increases quickly with engine speed. This minimum reflects a transition speed at which the contribution of the inertia force overcomes the contribution of the maximum pressure force to the maximum bearing load. The transition speed increases with an increase of counterweight mass and is a function of the geometric parameters and operating conditions of the engine. Rapid estimation of the main bearing loads is made possible by the use of the dimensionless relationships developed in the paper.

Numerical Analysis of High Power Marine Diesel Engine Main Bearing Load and Lubricating Properties

2013 ◽  
Vol 331 ◽  
pp. 25-30
Author(s):  
Xiu Xu Zhao ◽  
An Jian Huang ◽  
Zhi Xiang Hu
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Dynamic Pressure ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Minimum Thickness ◽  
Medium Speed ◽  
Bearing Load ◽  
Marine Diesel ◽  
Lubrication Condition

The main bearing is one of the primary friction pairs of a diesel engine. The lubrication condition affects the performance of the marine diesel engine directly. Continuous working time of main bearings is longer, load is higher and working condition is even worse especially in low medium speed marine diesel engine, making it difficult to form good dynamic pressure lubrication.Therefore, this paper takes a high-power marine diesel G32 with 9 cylinders as an example, calculates and analyzes the load, the orbit of main shaft center and the minimum thickness of oil film in each main bearing, providing the basis to estimate each main bearing’s lubricating condition, predicting each main bearing’s performance precisely and judging whether there exists abnormal working conditions in each main bearing.

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