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Kushwaha, Ajay
- Challenges and Scopes of Escape Analysis – A Review on Java Byte Code Optimization
Authors
1 Rungta College of Engineering and Technology for Session, IN
2 Rungta College of Engineering and Technology, Bhilai, IN
Source
Software Engineering, Vol 6, No 1 (2014), Pagination: 35-38Abstract
Java is a very promising language, which makes use of JVM for platform independency. Java compiler converts program into byte code which is further executed. There is scope for the optimization in the byte code produced by the compiler. For the static optimization in java one can work on the byte code or different intermediate code of java. The Escape Analysis is a static optimization analysis, which gives the scope for the unnecessary synchronization removal and place objects into the stack instead of heap. This paper describes the scope and challenges of byte code optimization (static analysis) in java especially using Escape Analysis and different supporting analysis.Keywords
Escape Analysis, Point to Analysis, Program Analysis.
- A Temperature Sensor based Feedback System to Ensure Uniform Microstructure in a Cast Product
Authors
1 Department of Mechanical Engineering, Indian Institute of Technology, Jammu, Jagti, PO Nagrota, NH-44, Jammu - 181 221, J&K, IN
Source
Manufacturing Technology Today, Vol 18, No 8 (2019), Pagination: 51-56Abstract
The mechanical properties of a metal casting are governed by grain size and microstructure in the metal, and isotropic microstructure leads to better mechanical properties. However, in practice, it is difficult to ensure cooling rates such that uniform microstructure in the cast occurs. In this paper, we propose a model for controlled cooling of the casting in order to achieve uniform microstructure and desired grain size throughout the cast product.
The main concept is that the microstructure of the casting depends on the rate of heat extraction. A faster rate of heat extraction leads to smaller grain size while a slower rate of heat extraction results in larger grain size. Generally, the geometry of the mould and the cast is such that the distance of cast from the external surface of the mould is continuously varying. This leads to variations in the rate of heat extraction which results in non-uniform grain development during the cooling process.
Since cooling rates are the primary concern, and this depends on the external temperature (Te ) of the mould, this temperature needs to be controlled. Our proposed model controls this temperature by using multiple variable speed fans to control Te. The relevant heat transfer equations comprising of conduction and convection will be used to model the temperature throughout the mould. A feedback system will be incorporated which will consist of temperature sensors and a cooling system that will be integrated with a data processing unit. The temperature (Te ) so measured will be used to control the fan speeds such that heat extraction rates are controlled to achieve uniform grain size and arrangement in the cast product.
Although the present model has been developed for relatively simple geometries, the same can be extended for more complicated casting geometries. This will form the next phase of our work.
Keywords
Temperature Sensor, Controlled Cooling, Heat Extraction, Feedback Mechanism.References
- Richard A. Hardin, Kai Liu, Beckermann, Christoph; Kapoor, Atul: A Transient Simulation and Dynamic Spray Cooling Control Model for Continuous Steel Casting, ‘Metallurgical and Materials Transactions B, vol. 34, no. 3, June 2003, 297–306.
- Lotov, Alexander V; Kamenev, George K; Berezkin, Vadim E; Miettinen, Kaisa: Optimal control of cooling process in continuous casting of steel using a visualization-based multi-criteria approach, ‘Applied Mathematical Modelling’, vol. 29, no. 7, July 2005, 653-672, https://doi.org/10.1016/j.apm.2004.10.009.
- Chaudhuri, S; Singh, RK; Patwari, K; Majumdar, S; Ray, AK; Singh, AK; Neogi, N: Design and implementation of an automated secondary cooling system for the continuous casting of billets, ‘ISA Trans.’, Jan 2010; vol. 49, no. 1, 121-9. doi: 10.1016/j.isatra.2009.09.005. Epub 2009 Oct 6.
- Liu Wen-hong; Zhi, Xle: Design and Simulation Test of Advanced Secondary Cooling Control System of Continuous Casting Based on Fuzzy Self-Adaptive PID, ‘Journal of Iron and Steel Research, International’, vol. 18, no. 1, January 2011, 26–30.