B. Ravindra

Bio: B. Ravindra is an academic researcher from Indian Institute of Technology, Jodhpur. The author has contributed to research in topics: Solar power & Photovoltaic system. The author has an hindex of 11, co-authored 30 publications receiving 569 citations. Previous affiliations of B. Ravindra include Technische Universität Darmstadt & Darmstadt University of Applied Sciences.

Ground-Based Measurement for Solar Power Variability Forecasting Modeling Using Generalized Neural Network

Abstract: The primary aim of this paper is to analyze solar power variability Ground-based measurements of solar photovoltaic power are used for the forecasting of 43-kW A-Si SPV system In this study, we describe the variability in the power production of solar photovoltaic plant at IIT, Jodhpur Solar PV generation forecasting is playing a key role in accurate solar power dispatchability as well as scheduling of PV power for hybrid power generation systems The actual power produced by a PV power system varies according to variation in meteorological parameters and efficiency of PV system components For the purpose of forecasting as per the schedule in the Indian power sector, a time slot of 15 min is considered for each forecasting The proposed generalized neural network technique will be appropriated for modeling of solar power variability forecasting In this paper, we used generalized neural network for forecasting the PV power variability

Comments on Quality Control of Solar Radiation Data Measured at a Ground Station in Hot and Dry Zone

Abstract: Ministry of New and Renewable Energy, Govt. of India has set a target of 100 giga watts (GW) power from solar power till 2022. Hence, the importance of solar radiation resource assessment. Ground-based solar radiation measurement and its quality plays an important role in the study of estimation of solar radiation and forecasting of solar power produced. In this paper hourly averaged solar irradiance data on a horizontal surface, measured at Indian Meteorological Department weather station for the hot and dry region, Jodhpur (India) is analyzed for the month of August, 2015. Data quality check is done in two stages where, at the first stage, solar irradiance is taken in original form, and then in the second stage BSRN standard guidelines, coherence and correlation tests are applied. Data quality check of ground-based solar radiation data for Jodhpur during rainy season (month having highest error/disturbances) highlights the need to include other weather parameters such as rainfall data. The results are compared with other available data, and some suggestions for data quality improvement are discussed.

Schaufelanordnung mit Dämpfungselementen

Abstract: Die vorliegende Erfindung betrifft eine Schaufelanordnung mit Dampfungselementen sowie ein Verfahren zur Vibrationsdampfung einer Schaufelanordnung. Die Schaufelanordnung umfasst einen Rotor sowie am Umfang des Rotors angeordnete Schaufeln. Zwischen den Schaufeln sind Dampfungselemente (2, 3) angeordnet, die bei einer Rotation des Rotors durch eine in radialer Richtung wirkende Zentrifugalkraft mit den Schaufeln in Kontakt stehen. Zwischen benachbarten Schaufeln sind hierbei zumindest zwei Dampfungselemente (2, 3) in Umfangsrichtung des Rotors hintereinander angeordnet, die sich bei einer Rotation des Rotors uber eine Beruhrungsflache (6) beruhren und von denen ein erstes Dampfungselement (2) mit einer ersten Reibungsflache (4) der einen und ein zweites Dampfungselement (3) mit einer zweiten Reibungsflache (5) der anderen Schaufel in Kontakt treten. Mit der Schaufelanordnung lassen sich eine Vielzahl von unterschiedlichen Schwingungszustanden wirksam dampfen.

Effect of material loss on energy transfer in a laminated beam actuated by a piezoceramic layer

Abstract: The electromechanical coupling factor (EMCF) defined as the ratio of convertible electric energy to the total energy stored in a electroelastic structure is a good measure to evaluate the performance of PZT transducers The concept of the EMCF can be utilized to optimize the design of actuators Piezoelectric material properties are temperature dependent and the actuators must not reach the Curie temperature The need for optimization of these devices results from nonideal behavior ie losses, saturation effects and other nonlinearities In high power applications, where material losses can lead to excessive heat production, different loss mechanisms should be carefully considered to find the optimal design A total loss factor, analogous to the concept of the EMCF, can be determined, which relates the dissipated energy to the energy stored in an electromechanical system for a given steady-state cycle of deformation A periodic laminated beam model is considered to investigate the loss factor dependence on the thickness of the piezoceramic layer Using the Bernoulli-Euler assumption for the electromechanical variables, the state equations of a planar laminated beam are derived Different losses are determined by employing the complex material constants The influence of different loss mechanisms on the total dissipated energy is investigated

The Method of Proper Orthogonal Decomposition for Dynamical Characterization and Order Reduction of Mechanical Systems: An Overview

Abstract: Modal analysis is used extensively for understanding the dynamic behavior of structures. However, a major concern for structural dynamicists is that its validity is limited to linear structures. New developments have been proposed in order to examine nonlinear systems, among which the theory based on nonlinear normal modes is indubitably the most appealing. In this paper, a different approach is adopted, and proper orthogonal decomposition is considered. The modes extracted from the decomposition may serve two purposes, namely order reduction by projecting high-dimensional data into a lower-dimensional space and feature extraction by revealing relevant but unexpected structure hidden in the data. The utility of the method for dynamic characterization and order reduction of linear and nonlinear mechanical systems is demonstrated in this study.