Prediction of ground pressure distribution under tracked vehicles—I. An analytical method for predicting ground pressure distribution

1981 ◽  
Vol 18 (1) ◽  
pp. 1-23 ◽  
Author(s):  
M. Garber ◽  
J.Y. Wong
Keyword(s):  
Pressure Distribution ◽  
Analytical Method ◽  
Tracked Vehicles ◽  
Ground Pressure

The Research on Grounding Pressure Distribution of Tracked Travelling Mechanism

2014 ◽  
Vol 526 ◽  
pp. 115-120
Author(s):  
Xi Yang Liu ◽  
Zhi Yong Jiao ◽  
Mei Yu Zhang
Keyword(s):  
Mathematical Model ◽  
Pressure Distribution ◽  
Center Of Gravity ◽  
Core Region ◽  
Tracked Vehicles ◽  
Overall Design ◽  
Ground Pressure ◽  
Ground Conditions ◽  
The Mathematical Model

The grounding pressure of tracked vehicles is closely related to the overall structure of the vehicles and the ground conditions, and its distribution is more complex and changes in the different center of gravity. So in this paper, under certain assumptions, we derive the mathematical model of the grounding pressure distribution through analysis and research, which can predict the ground pressure distribution of tracked vehicles at any moment. By analyzing the tracked grounding pressure distribution, we put forward the concept of core region of track connecting with the ground, and some meaningful conclusions and formulas for the overall design of tracked vehicles.

The foot-ground pressure distribution following triple arthrodesis

1981 ◽  
Vol 98 (4) ◽  
pp. 263-269 ◽  
Author(s):  
Haim Stein ◽  
Ariel Simkin ◽  
Keenan Joseph
Keyword(s):  
Pressure Distribution ◽  
Triple Arthrodesis ◽  
Ground Pressure

Dynamically Loaded Finite Length Journal Bearings: Analytical Method of Solution

1999 ◽  
Vol 121 (4) ◽  
pp. 844-852 ◽  
Author(s):  
H. Hirani ◽  
K. Athre ◽  
S. Biswas
Keyword(s):  
Pressure Distribution ◽  
Closed Form ◽  
Analytical Method ◽  
Journal Bearings ◽  
Positive Pressure ◽  
Maximum Pressure ◽  
Pressure Curve ◽  
Connecting Rod ◽  
Dynamically Loaded ◽  
Form Pressure

A closed-form pressure distribution, using a combination of short- and long-bearing approximations, is proposed for dynamically loaded journal bearings. The angles for start and finish of positive pressure curve are determined employing simple analytical equations. The mobility method, based on the suggested pressure distribution is easy to use, predicts results of acceptable accuracy and the execution time is comparable to that required for the short bearing approximation. This paper also provides a conceptually simple analytical method for evaluating angular location of the instantaneous maximum pressure using proposed closed form pressure distribution. Simple algebraic equations are derived to obtain the instantaneous maximum pressure in dynamically loaded bearings directly, without involving any iteration. To illustrate the validity of present study, a connecting rod big end bearing and two crankshaft main bearings are analyzed. The mobility components, minimum film thickness and maximum pressure are plotted over a load cycle and compared with established analytical and curve fit methods. The results are also compared with those obtained using finite element method.

The Development and Validation of a Computer Aided Method for Design Evaluation of Tracked Vehicles with Rigid Links

1994 ◽  
Vol 208 (3) ◽  
pp. 207-215 ◽  
Author(s):  
Y Gao ◽  
J Y Wong
Keyword(s):  
High Speed ◽  
New Products ◽  
Cost Effective ◽  
Design Evaluation ◽  
Tracked Vehicles ◽  
Military Vehicles ◽  
Ground Pressure ◽  
Effective Manner ◽  
Computer Aided ◽  
Basic Features

In the past decade, a computer aided method for design evaluation of high-speed tracked vehicles with flexible tracks (or tracks with relatively short track pitch commonly in use in tracked transport vehicles and military vehicles) has been developed. It has been successfully used in assisting vehicle manufacturers in the development of new products and governmental agencies in the selection of vehicle candidates. For low-speed tracked vehicles commonly in use in agriculture, construction and logging, rigid tracks with relatively long track pitch are employed to achieve a more uniform ground pressure distribution. To assist manufacturers of this type of vehicle to expedite the development of new products in a cost effective manner, a computer aided method for design evaluation of tracked vehicles with rigid links has recently been developed. It treats the track as a system of interconnected rigid links and takes into account the characteristics of the interaction between track links and deformable terrain. The basic features of the method have been verified by field test data. The method can be an extremely useful tool for the engineer to optimize vehicle design and for the procurement manager to select appropriate vehicle candidates to meet specific operating requirements.

scholarly journals A Novel Analytical Method to Calculate the Amounts of Free and Adsorbed Gas in Shale Gas Production

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Qingyu Li ◽  
Peichao Li ◽  
Wei Pang ◽  
Quanfu Bi ◽  
Zonghe Du ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Shale Gas ◽  
Analytical Method ◽  
Gas Production ◽  
Petroleum Engineering ◽  
Formation Pressure ◽  
Adsorption Model ◽  
Gas Reservoirs ◽  
Free Gas ◽  
Adsorbed Gas

Shale gas has now become an important part of unconventional hydrocarbon resources all around the world. The typical properties of shale gas are that both adsorbed gas and free gas play important roles in gas production. Thus the contributions of free and adsorbed gas to the shale gas production have become a hot, significant, and challenging problem in petroleum engineering. This paper presents a new analytical method to calculate the amounts of free and adsorbed gas in the process of shale gas extraction. First, the expressions of the amounts of adsorbed gas, matrix free gas, and fracture free gas in shale versus the producing time are presented on the basis of Langmuir adsorption model and formation pressure distribution. Next, the mathematical model of multifractured horizontal wells in shale gas reservoirs is established and solved by use of Laplace transform and inversion to obtain the normalized formation pressure distribution. Finally, field case studies of two multifractured horizontal shale gas wells in China are carried out with the presented quantitative method. The amounts of adsorbed and free gas in production are calculated, and the adsorbed-to-total ratio is provided. The results show that the proposed method is reliable and efficient.

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