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Ranjan, Prabhat
- Development of Signal Conditioning System for Biosensor Applications
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Authors
Affiliations
1 Central Manufacturing Technology Institute, Bangalore, IN
1 Central Manufacturing Technology Institute, Bangalore, IN
Source
Manufacturing Technology Today, Vol 19, No 9 (2020), Pagination: 56-59Abstract
This signal conditioning circuit design is a micro-power, three terminal electrochemical cell amplifier that uses less than 1-μA total supply current for battery-powered or energy-harvested sensor applications. Electrochemical cells necessitate constant bias, which requires the amplifier circuit to be powered continuously to eliminate sensor start-up and settling times. The design is assembled on a dotted board compatible with the development Kit platform to allow testing with an MSP430 ultra-low-power processor to utilize the launchpad processor analog to digital converters (ADCs) and liquid crystal display (LCD) for stand-alone operation. The whole design consideration is done after taking into consideration of three-terminal screen printed electrode that can have several applications as verified by experimentations and results. The design can be used for agricultural applications as a wide range of sensor current has been taken into design consideration. This needs simple modification based on sensitivity and response time of sensor.Keywords
MSP430, Op-Amp, Screen Printed Electrode, Trans-Impedance Amplifier, Potentiostat, Current Source.
- Mechanism of material removal on stainless steel through diamond abrasion: a molecular dynamics simulation study
Abstract Views :61 |
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Authors
Affiliations
1 Bhabha Atomic Research Centre, Mumbai, India, IN
2 Homi Bhabha National Institute, Mumbai, India, IN
3 Cardiff University, Cardiff, UK, IN
4 BITS Pilani, Pilani India, IN
5 London South Bank University, London, UK, IN
1 Bhabha Atomic Research Centre, Mumbai, India, IN
2 Homi Bhabha National Institute, Mumbai, India, IN
3 Cardiff University, Cardiff, UK, IN
4 BITS Pilani, Pilani India, IN
5 London South Bank University, London, UK, IN
Source
Manufacturing Technology Today, Vol 22, No 3 (2023), Pagination: 37 - 44Abstract
A rough surface of any engineering material exhibits high surface energy which results in higher potential energy or cohesive energy of the material, and it affects both optical as well as chemical properties. In this paper, stainless steel 304 (or SS304) is selected for nano-finishing through diamond abrasive using MD simulations. It is found that the diamond abrasive creates new bonds with Cr and Fe atoms by rise in local temperature and stresses. Moreover, Ni atom diffuses inside the abrasive as it does not chemically bond with C atom. The abrasion on steel due to diamond also leads to phase transformation on both abrasive as well as the workpiece. Subsequently, the transformed phase is removed from the workpiece due to the newly formed chemical bonds, however, in the process, the abrasive particle deteriorates by phase transformation and materials loading. Thus, the present study is useful in optimising nano-finishing or nano-cutting process on stainless steel.Keywords
Nano-Finishing, Polishing, Molecular Dynamics Simulation, Stainless Steel, Corrosion Resistance.References
- Bonny, G., Terentyev, D., Pasianot, R. C., Poncé, S., & Bakaev, A. (2011). Interatomic potential to study plasticity in stainless steels: the FeNiCr model alloy. Modelling and Simulation in Materials Science and Engineering, 19(8), 085008. https:// doi.org/10.1088/0965-0393/19/8/085008
- Fatima, S., Khan, M., Jaffery, S. H. I., Ali, L., Mujahid, M., & Butt, S. I. (2015). Optimization of process parameters for plasma arc welding of austenitic stainless steel (304 L) with low carbon steel (A-36). Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 230(2), 640-653. https://doi.org/10.1177/1464420715584392
- Hu, X., Song, Z., Liu, W., Qin, F., Zhang, Z., & Wang, H. (2012). Chemical mechanical polishing of stainless steel foil as flexible substrate. Applied Surface Science, 258(15), 5798-5802. https:// doi.org/10.1016/j.apsusc.2012.02.100
- Ranjan, P., Balasubramaniam, R., & Jain, V. K.(2018). Investigations into the mechanism of material removal and surface modification at atomic scale on stainless steel using molecular dynamics simulation. Philosophical Magazine, 98(16), 1437-1469. https://doi.org/10.1080/14 786435.2018.1439191
- Sansone, V. (2013). The effects on bone cells of metal ions released from orthopaedic implants.
- A review. Clinical Cases In Mineral And Bone Metabolism. https://doi.org/10.11138/ccmbm/ 2013.10.1.034
- Shih, C.-C., Shih, C.-M., Su, Y.-Y., Su, L. H. J., Chang, M.-S., & Lin, S.-J. (2004). Effect of surface oxide properties on corrosion resistance of 316L stainless steel for biomedical applications. Corrosion Science, 46(2), 427-441. https://doi. org/10.1016/s0010-938x(03)00148-3
- Stadler, J., Mikulla, R., & Trebin, H. (1997). IMD: A Software package for molecular dynamics studies on parallel computers. International Journal of Modern Physics C, 8, 1131-1140
- Stukowski, A. (2009). Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool. Modelling and Simulation in Materials Science and Engineering, 18(1), 015012. https://doi.org/10.1088/0965-0393/ 18/1/015012
- Subramaniyan, A. K., & Sun, C. T. (2008). Continuum interpretation of virial stress in molecular simulations. International Journal of Solids and Structures, 45(14-15), 4340-4346. https://doi. org/10.1016/j.ijsolstr.2008.03.016
- Tersoff, J. (1989). Modeling solid-state chemistry: Interatomic potentials for multicomponent systems. Physical Review B, 39(8), 5566-5568.https://doi.org/10.1103/physrevb.39.5566
- Verkhovtsev, A. V., Schramm, S., & Solov’yov, A. V. (2014). Molecular dynamics study of the stability of a carbon nanotube atop a catalytic nanoparticle. The European Physical Journal D, 68(9). https://doi.org/10.1140/epjd/e201450371-4
- Xie, J. (2006). Atomistic Simulations and Experimental Studies of Transition Metal
- Systems Involving Carbon and Nitrogen. Stockholm: Royal Institute of Technology.
- Zaretsky, E. V. (2012). Rolling bearing steels – a technical and historical perspective. Materials
- Science and Technology, 28(1), 58-69. https:// doi.org/10.1179/1743284711y.0000000043
- Design and Development of High-Speed Rotating Impeller for Turbo- Molecular Pump Through Topology Optimisation
Abstract Views :109 |
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Authors
Affiliations
1 Bhabha Atomic Research Centre Mumbai, Homi Bhabha National Institute Mumbai, IN
1 Bhabha Atomic Research Centre Mumbai, Homi Bhabha National Institute Mumbai, IN
Source
Manufacturing Technology Today, Vol 22, No 2 (2023), Pagination: 61 - 66Abstract
Additive Manufacturing (AM) process has potential to manufacture complex structures to cater the design requirement and process requirement for any specific application. However, this process is expensive as compared to the traditional and on-going advanced manufacturing process. The cost of AM process depends on volume/mass and size of the parts, and due to this, the AM manufactured part needs to be topologically optimised before manufacturing. In view of this, the manufacturer has to ensure the functionality and acceptability of design parameters about the computer aided design (CAD) model through a reliable numerical modelling technique for the topology optimisation (TO). Moreover, the CAD model also needs to be compatible for ease of manufacturing by AM process which is possible by post analysis and CAD modification. In the present paper, TO was implemented for a high-speed rotating impeller of a turbo-molecular pump (TMP) followed by manufacturing to achieve better performance.
Keywords
Topology Optimisation, Additive Manufacturing, Turbo-Molecular Pump, Rotor-Dynamics, Finite Element AnalysisReferences
- Aremu, A., Ashcroft, I., Hague, R., Wildman, R., & Tuck, C. (2010). Suitability of SIMP and BESO topology optimization algorithms for additive manufacture. 21st Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2010. 679-692.
- Bendsoe, M. P., & Kikuchi, N. (1988). Generating optimal topologies in structural design using a homogenization method. Computer Methods in Applied Mechanics and Engineering, 71, 197-224.
- Hablanian, M. H. (2007). Engineering aspects of turbomolecular pump design. Vacuum. 82, 61-65. 10.1016/j.vacuum.2007.04.030.
- Han, B., Huang, Z & Le, Y. (2017). Design aspects of a large scale turbomolecular pump with active magnetic bearings. Vacuum, 142, 96-105. 10.1016/j.vacuum.2016.12.010.
- Murr, L. E., Gaytan, S. M., Ramirez, D. A., Martinez, E., Hernandez, J., Amato, K. N., Shindo, P. W., Medina, F. R., & Wicker, R. B. (2012). Metal fabrication by additive manufacturing using laser and electron beam melting technologies. Journal of Materials Science & Technology, 28(1), 1-14.
- pfeiffer-vacuum. (n. d). Turbopumps. https://www. pfeiffer-vacuum.com/en/products/vacuum- generation/turbopumps/
- Yoshimura, N. (2020). A Review: Ultrahigh-Vacuum Technology for Electron Microscopes. ISBN 978-0-12-818573-5.