A New Approach for Modeling Cycle-to-Cycle Variations within the Framework of a Real Working-Process Simulation

2013 ◽  
Vol 6 (2) ◽  
pp. 1099-1115 ◽  
Author(s):  
Markus Wenig ◽  
Michael Grill ◽  
Michael Bargende
Keyword(s):  
Process Simulation ◽  
Working Process ◽  
New Approach

Multi-Fields Coupled Simulation on Casting Process of Aluminum Alloy Based on Heat Conduction by Rotating Heat Pipe Bundle

2012 ◽  
Vol 621 ◽  
pp. 237-245
Author(s):  
Jian Mei Chen ◽  
Yu Qiang Li ◽  
Jia Qiang E
Keyword(s):  
Aluminum Alloy ◽  
Heat Conduction ◽  
Heat Pipe ◽  
Heat Pipes ◽  
Casting Process ◽  
Working Process ◽  
New Approach ◽  
Molten Liquid ◽  
Ingot Solidification ◽  
Structure Layout

Based on the knowledge to defects and advantages of traditional ingot casting, a new approach for casting of aluminum alloy ingot, based on heat conduction by rotating heat pipes, is put forward in this paper. Different from the conventional casting method that cooling around ingot, the microstructure and properties of casting ingots can be significantly improved due to cooling of molten liquid from the central by rotating heat pipes proposed by this paper. Through simulation on the working process and the fields of flow and temperature, it can be speculatively seen that the ingot solidification is from inside to outside and that inner stress inside the ingot is compressive. The influences of speed of heat pipe bundle, casting speed and casting temperature on the temperature field in the ingot have been systematically studied. The ingots with different sizes can be prepared by changing size and structure layout of the heat pipes.

scholarly journals Continuous-Time Perfect Control Algorithm—A State Feedback Approach

2021 ◽  
Vol 11 (16) ◽  
pp. 7466
Author(s):  
Marek Krok ◽  
Wojciech P. Hunek ◽  
Paweł Majewski
Keyword(s):  
Design Process ◽  
Process Simulation ◽  
Continuous Time ◽  
Control Algorithm ◽  
State Feedback ◽  
Closed Loop ◽  
Control Design ◽  
Control Law ◽  
New Approach

In this paper, a new approach to the continuous-time perfect control algorithm is given. Focusing on the output derivative, it is shown that the discussed control law can effectively be implemented in terms of state-feedback scenarios. Moreover, the application of nonunique matrix inverses is also taken into consideration during the perfect control design process. Simulation examples given within this work allow us to showcase the main properties obtained for continuous-time perfect control closed-loop plants.

New approach to refinery process simulation with adaptive composition representation

AIChE Journal ◽  
2004 ◽  
Vol 50 (3) ◽  
pp. 633-645 ◽  
Author(s):  
Heiko Briesen ◽  
Wolfgang Marquardt
Keyword(s):  
Process Simulation ◽  
New Approach ◽  
Refinery Process

Dynamics Analysis and Cam Profile Optimal Design of the Valve Train in the Diesel Engine with High Specific Power

2011 ◽  
Vol 308-310 ◽  
pp. 1636-1640 ◽  
Author(s):  
Li Wei Sun ◽  
Tie Xiong Su ◽  
Jun Feng Xu ◽  
Qiang Wang ◽  
Chun Long Xu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Optimal Design ◽  
Dynamic Analysis ◽  
Process Simulation ◽  
Valve Train ◽  
Specific Power ◽  
Intake Port ◽  
Working Process ◽  
High Specific Power ◽  
Cam Profile

The study carries out optimal design for the cam profile of the valve train in a high-specific-power diesel engine. The dynamic analysis on the original cam reveals that the original one, which leads to adequate fullness coefficient, is designed far from the material margins. The fullness coefficient and time area value are selected as the optimization objective, and the piecewise fucntion method is utilized to optimally design the cam profile. The restrictive contidons are applied to each section on the cam. Thus the function and the optimal coeficients are obtained. Then the dynamic analysis and working process simulation on the optimal valve train are carried out, and it proves that the dynamic and intake port performaces of the optimized one are greatly impoved.

Modeling and Simulation of Two-Stage Expansion Air-Powered Engine

2014 ◽  
Vol 694 ◽  
pp. 49-53
Author(s):  
Qing Ping Zheng ◽  
Jin Wang ◽  
Su Li ◽  
Jing Jing Zhou ◽  
Feng Bai
Keyword(s):  
Process Simulation ◽  
Consumption Rate ◽  
Thermodynamic Simulation ◽  
Gas Temperature ◽  
Working Process ◽  
Two Stage ◽  
Effective Power ◽  
Second Stage ◽  
Output Torque ◽  
Gas Consumption

Thermodynamic simulation of a two-stage expansion air-powered engine was established and working process simulation was conducted based on this model. The effects of inlet pressure (0.8Mpa-3.0Mpa), intake duration angle of second-stage (100°CA-160°CA) and cylinder diameter of second-stage (120mm-200mm) on the gas temperature, pressure and output torque were analyzed. The results show that effective power and output torque both increase with the increase of above three parameters, meanwhile effective gas consumption rate decreases.

Engineering surfaces—a philosophy of manufacture (a proposal for good manufacturing practice)

1998 ◽  
Vol 212 (3) ◽  
pp. 169-174 ◽  
Author(s):  
K J Stout
Keyword(s):  
Mechanical Properties ◽  
Surface Engineering ◽  
Good Manufacturing Practice ◽  
Working Process ◽  
New Approach ◽  
Rigorous Approach ◽  
Final Surface ◽  
Finishing Process ◽  
Functional Purpose

This paper considers a new approach to controlling the finishing process of engineering surfaces to ensure that their final topography and surface mechanical properties make them suitable for the intended functional purpose. It is proposed that this ‘engineering’ of the final surface is achieved by controlling the final machining or surface working process to impart the required mechanical properties. It is shown in the paper that some surface engineering processes are already employed by industry but that many of these processes are implemented through an empirical understanding of them. The intention of the paper is to lay down a basis for a more rigorous approach to engineering surfaces for their final function.

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