Browsing by Author "Patkar, R."

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Modal and random vibration analysis of pneumatic actuator of wastegate turbocharger using finite element method
(Association of American Publishers, 2025) Patkar, R.; Joladarashi, S.
Turbocharging is the most common power augmentation method used in both spark and compression ignition engines. However, the excessive turbo boost can end up in risking the intake manifold pressure which can negatively affect the performance of an engine. Therefore, the modern turbochargers are developed with wastegate which effectively controls the turbine speed and limits the excessive turbo boost bypassing the fraction of exhaust gas. In this work, the modal and random vibration analysis of the pneumatic actuator assembly of a wastegate turbocharger is presented. The turbocharger was substituted by a dummy vibratory shaker table with test spacers and a subassembly was mounted on the shaker table. The model of the actuator was designed in CreoÂ© software and finite element analysis was performed in the commercially available software package ANSYSÂ©. The materials used for critical components of the assembly were Structural Steel and SAE1008 Steel for the bracket and CAN respectively. Initially the structural load in the form of bolt pretension was applied at bolted joints and prestressed modal analysis was performed. The results of modal analysis were further utilized for random vibration analysis. The PSD acceleration input was given to the shaker table and output response at critical locations was analyzed. Subsequently, the results were quantitatively analyzed for modal participation factor variation, natural frequencies and PSD equivalent stresses in the actuator assembly. Â© 2025, Association of American Publishers. All rights reserved.
Performance analysis of energy efficient modulation and coding schemes for wireless sensor networks
(2013) Shivaprakasha, K.S.; Kulkarni, M.; Patkar, R.
Sensor nodes of a typical wireless sensor network (WSN) are battery driven, so energy conservation is a critical factor for node's life time. Thus optimisation of energy consumption is a major objective in the area of WSNs. One such method is asymmetric communication which uses different channel codes and modulation schemes for downlink (base station (BS) to node link) and uplink (node to BS link). In this paper, a performance analysis of different channel code-modulation pair for energy efficient asymmetric communication is carried out followed by the field programmable gate array implementation of channel codes required at the node. The per information bit node energy for the uplink has been calculated for efficient channel code-modulation pair, for three different channels, viz. additive white gaussian noise, Rayleigh flat-fading and log-normal shadowing channels, resulting in reduction in energy consumption at sensor nodes. 2013 Copyright Taylor and Francis Group, LLC.
Performance analysis of energy efficient modulation and coding schemes for wireless sensor networks
(2013) Shivaprakasha, K.S.; Kulkarni, M.; Patkar, R.
Sensor nodes of a typical wireless sensor network (WSN) are battery driven, so energy conservation is a critical factor for node's life time. Thus optimisation of energy consumption is a major objective in the area of WSNs. One such method is asymmetric communication which uses different channel codes and modulation schemes for downlink (base station (BS) to node link) and uplink (node to BS link). In this paper, a performance analysis of different channel code-modulation pair for energy efficient asymmetric communication is carried out followed by the field programmable gate array implementation of channel codes required at the node. The per information bit node energy for the uplink has been calculated for efficient channel code-modulation pair, for three different channels, viz. additive white gaussian noise, Rayleigh flat-fading and log-normal shadowing channels, resulting in reduction in energy consumption at sensor nodes. © 2013 Copyright Taylor and Francis Group, LLC.