Informatics Publishing Limited

A. Karthikeyan ¹, M. Geetha ¹, K. Chandrasekaran ¹

Affiliations
1 Institute of Forest Genetics and Tree Breeding, Coimbatore– 641 002 (Tamil Nadu), IN

Abstract

No Abstract

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T. G. Loganathan ¹, R. Krishna Murthy ¹, K. Chandrasekaran ¹

Affiliations
1 Department of Mechanical Engineering, RMK College of Engineering and Technology, RSM Nagar, Gummidipondi Taluk, Tiruvallur District, 601206, Tamil Nadu, IN

Abstract

The suspension systems in automobiles are to provide adequate flexure modulus and damping in response to the road tyre interaction. This will ensure adequate driving comfort. In this context, as a weight reduction measure and to provide sufficient response to the vehicle dynamics leaf springs made of composite materials and can be a replacement for traditional metal leaf springs. Hence the present study on the GFRP composite laminate is to experimentally simulate the loading environment in the vehicle and the response of spring leaf made of composite material. GFRP composite laminate specimen of configurations such as Unidirectional Laminate (UD-0), angle ply laminate (0/30/60/0 and 0/45/0/-45) and symmetric and non-symmetric cross ply laminates (0/90/90/0 and 0/90/0/90) are prepared by hand lay-up technique. The laminates are exposed to low cycle (4.6 Hz and 8.6 Hz), constant amplitude cyclic loading in the laboratory setup. The flexural modulus of the virgin and pre-cyclic loaded specimen is measured by three point bend test using digital UTM as per ASTM D 790. The flexural modulus of the pre-cyclic loaded laminate specimen presents a positive improvement up to certain loading cycles at low frequency (4.6Hz). At high frequency (8.6 Hz) loading cycles there existdegradation in the flexural modulus of the pre-cyclic loaded specimen. The enhancement and degradation of flexural modulus on exposure to cyclic loading signify the influence of loading cycle frequency and laminate configuration. Any variation in the specimen configuration apart from UD-0 ply, record a drop in the flexural modulus. The optimum flexural responses characteristics in composite material are attributed to the selection of lay-up configuration and loading condition.

Keywords

Cyclic Load, Fibre Orientation, Flexural Modulus, GFRP, Loading Frequency

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B. Annappa ¹, K. Chandrasekaran ¹, K. C. Shet ¹

Affiliations
1 National Institute of Technology Karnataka, Surathkal, IN

Abstract

Workflow technology has been an active area of research for many years. Though several workflow models have been designed in these years, there are very few attempts that have been made to design a cooperative workflow model. In this paper we propose a conceptual model for cooperative workflows in the distributed environments based on the Bonita workflow model. Bonita is open source cooperative workflow management software which is an ongoing project from object web consortium. We apply the model to an Online shopping scenario and analyzed the corresponding speed up. The results indicate that the model is valid and effective.

Keywords

Workflow Model, Cooperative Workflow, Workflow Net, Inter-Organizational Workflows, Bonita.

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A. Venkadesan ¹, K. Sedhu Raman ², K. Chandrasekaran ¹, C. S. Boopathi ³

Affiliations
1 Department of EEE, NIT Puducherry, Karaikal - 609609, Puducherry, IN
2 Department of EEE, MVIT, Kalitheerthalkuppam - 605107, Puducherry, IN
3 Department of EEE, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Objectives: This paper presents harmonics estimation using Artificial Neural Network (ANN) for a 2 pulse Un-controlled power electronics converter. Methods/Analysis: Feed-forward architecture is chosen to model ANN-based Harmonics Estimator. The Feedforward architecture trained with various Learning algorithms is investigated. The suitable ANN model is identified. The performance of ANN based harmonics estimator is compared with conventional Fourier series method. Findings: The feed-forward architecture trained with LM algorithm is identified to be suitable for harmonics estimation in 2-pulse uncontrolled rectifier. Novelty/Improvement: The suitability of feed-forward architecture with different learning algorithms is investigated which is novel in this paper.

Keywords

Artificial Neural Networks, Estimator, Feed-Forward Neural Architectures, Harmonics, Learning Algorithms, Power Electronics Converters, 2-Pulse Controlled Rectifier.

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K. Chandrasekaran ¹

Affiliations
1 Tata Institute of Fundamental Research, Bombay, IN

Abstract

The death of Dr. S. S. Pillai (Subbayya Pillai Sivasankaranarayana Pillai) in the crash of the aircraft, Star of Maryland, near Cairo on August 31, 1950 removes from our midst one of our best mathematicians. Pillai was on his way to the United States when the accident occurred.

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K. Chandrasekaran

Abstract

Consider the solutions of the Sturm-Liouville differential equation

d/dx (k dV/dx) + (gr-l) V = 0                            (1)

for an interval (a, b) of the variable x.

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