Suguna Thanagasundram

Temasek Polytechnic · Clean Energy

This paper aims to characterize pouch cells based on the parameters external pressure, temperature & C-rate and study its effect on capacity & open circuit voltage (OCV) of the cell. Lithium batteries based energy storage devices are gaining prominence in for its role in tapping the potential of renewable energy sources and electro-mobility. For la...

This paper presents an improved method of modelling the hysteresis effect in batteries using the discrete preisach model. The hysteresis effect can be seen as a path-dependent effect or history-dependent effect on the lithium ion battery. This effect complicates the relationship between State of Charge (SOC) and Open Circuit Voltage (OCV) as it is...

An equivalent circuit model is the most common and straight-forward way of representing the dynamic behaviour of a lithium-ion battery. In literature, many examples of circuits are proposed and various techniques are also discussed for parameterisation of the models. In this paper a second order equivalent circuit is proposed and the parameters ide...

This paper describes the work done on advanced fault management strategies at a system of systems level on the start authorization process in a vehicle. The start authorization system in a vehicle is a complicated and critical vehicle process. It manifests itself as a complex multi-stage process which involves several stages of verification and val...

The key innovation of the described Hardware-in-the-loop (HIL) simulator is the use of flexible and software reconfigurable signal-conditioning to establish connectivity between the HIL simulator and the prototype Electronic Controller Units (ECUs) in the Electronic Body System (EBS) of a vehicle. In the automotive industry, the electrical architec...

An automotive side door latch release mechanism has been modelled for the locking and unlocking vehicle functionality in Dymola. The performance of the developed door lock model is evaluated against an existing model of a similar door locking/unlocking system in Stateflow. The model performance is also compared with measurements from a real vehicle...

Physical modeling is a modeling and simulation technique that captures the physics and mathematics of a system through high fidelity dynamic models which are based on equations and symbolic manipulation. In this study, a physical model of a side door latch release mechanism for an automotive application has been developed in Dynamic Modelling Labor...

A new scheme is proposed that combines autoregressive (AR) modelling techniques and pole-related spectral decomposition for the study of incipient single-point bearing defects for a vibration-based condition monitoring system. Vibration signals obtained from the ball bearings from the high vacuum (HV) and low vacuum (LV) ends of a dry vacuum pump r...

Abstract: A Morlet-like wavelet cluster-based method for band-pass filtering and envelope demodulation is described.Via appropriate choice of wavelet parameters, a wavelet cluster combined with multi-Morlet-like wavelets can be used as a band-pass filter with zero phase shift, flat topped pass-band and rapid attenuation in the transition band. It c...

Paper presented at the ISMA2006 Noise and Vibration Engineering Conference, held in Leuven, Belgium, from 18-20 September 2006. Conference program and proceedings available from http://www.isma-isaac.be/past/conf/isma2006/ An investigation into the vibration characteristics of a ‘Roots and Claws’ based dry vacuum pump under different operating cond...

A paper presented at the Thirteenth International Congress on Sound and Vibration, held in Vienna, Austria, July 2-6, 2006. A five stage “Roots and Claw” dry vacuum pump is a typical kind of quasi-steady state high speed rotating machine. The research using the novel Acoustic Emission measurement and Wavelet technique aims to develop advanced detec...

A paper presented at ICSV13 - Thirteenth International Congress on Sound and Vibration, held in Vienna, Austria, July 2-6, 2006 In this paper a novel approach is proposed for vibration based fault detection studies by the tracking of pole movements in the complex z domain. Vibration signals obtained from the ball bearings from a High Vacuum (HV) an...

This is the publisher's PDF of the paper published as International Journal of Acoustics and Vibration, 2006, Vol. 11(3), pp.144-154. It is reproduced here with the publisher's permission. The published article is also available from the IJAV journal website at: http://www.iiav.org/ijav/index.php?va=viewpage&vaid=176 This paper provides a practical...

The design and implementation of instrumentation to collect real-time vibrational data from a quasi-steady state machine (a dry vacuum pump) for fault prediction diagnostics is presented. When simultaneous multiple data collection points are required on the same machinery, the use of conventional transducers such as piezoelectric accelerometers bec...

Oil-free dry-vacuum pumps are prevalent in semiconductor plants worldwide today. The popularity of such pumps has grown over the years but little research has been done in the area of condition-monitoring of dry-vacuum pumps. Fault detection of one such pump through the use of AutoRegressive (AR) modelling technique and spectral analysis of vibrati...