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Occupant Controlled Ventilation

Mahindra & Mahindra, Ltd.-Priyanka Marudhavanan
  • Technical Paper
  • 2019-28-2461
To be published on 2019-11-21 by SAE International in United States
Keywords-Coolant,Ventilation Research and/or Engineering Questions/Objective: Number of Occupants is the major parameter when we consider Air Conditioning System. The number of person who stays in the room may vary in the same way the person who travels in the automobile also vary throughout the distance. This is more prevalent in transportation system like bus, train and where lot of people will travel together and where dropping station in the vehicle is too frequent.In this type,operating A.C has to be varied Methodology: . Instead the number count in the vehicle will be monitored from time to time. Based on the number of count, the cabin has to be cooled or heated and accordingly corresponding power has to be drawn by the compressor from the engine. This human count can be detected based on the number of CO2 sensor located in the cabin. the amount of fresh air that should be added to a cabin can be controlled by a carbon dioxide level transmitter. When CO2 levels go up, fresh air is added until the CO2 levels…
 

Assessment of Numerical Cold Flow Testing of Gas Turbine Combustor through an Integrated Approach using Rapid Prototyping and Water Tunnel

Indian Institute of Technology Madras-Ssheshan Pugazhendhi
SRM Institute of Science and Technology-Sundararaj Senthilkumar
  • Technical Paper
  • 2019-28-0051
To be published on 2019-10-11 by SAE International in United States
In the present work, it is aimed at developing an integrated approach for combustor modeling involving rapid prototyping and water tunnel testing to assess the cold flow numerical simulations; the physical model will be subjected to cold flow visualization and parametric studies and CFD analysis to demonstrate its capability for undergoing rigorous cold flow testing. A straight through annular combustor is chosen for the present study because of it has low pressure drop, less weight and used widely in modern day aviation engines. Numerical Analysis has been performed using ANSYS-FLUENT. Three dimensional RANS equations are solved using k-ɛ model for the Reynolds numbers ranging from 0.64 x 10^5- 1.5 x 10^5 based on the annulus diameter. Post processing the results is done in terms of jet penetration, formation of re-circulation zone, effective mixing, flow split and pressure drop for different cases. Physical combustor models are fabricated using Rapid prototyping with Poly Lactic Acid material and approximated 2D combustor model is used for capturing important flow patterns using high speed camera in 2D water tunnel, and…
 

Design for Adaptive Rear floor carpet for changing shapes and complex architecture

Mahindra & Mahindra, Ltd.-Praveen Kumar, Ramakrishna Nimmagadda, Harshad Bornare, Nareen Kinthala
  • Technical Paper
  • 2019-28-0004
To be published on 2019-10-11 by SAE International in United States
Floor carpets in vehicle find their use to hide the metal floor. It is primary designed to protect the floor of a vehicle from dirt, wear, BSR and salt corrosion. The paper presented here proposes an engineering solution for development of an adaptive carpet which can be commonly used across three variants. The three variants have different seating configurations and the mounting strategies are specifically designed to cater to the needs of the particular variant which requires the development of different rear carpets and underlay NVH felts. This requires heavy investment owing to the requirement of different tools. The paper demonstrates engineering one single Adaptive rear floor carpet meeting mounting requirement of all the three variants and also matching with the carryover front floor & carpet, door scuff plate, RQT and Rear Scuff plate. Single Underlay felt and single carpet is designed considering all three variants seat mounting configurations. It ensures easy identification of the carpet part in built shop and no compromise in the NVH perimeters from the underlay floor. Unique fixations identified for…
 

A Coupled Lattice Boltzmann-Finite Volume Method for the Thermal Transient Analysis of an Air Cooled Li-ion Battery Module for Electric Vehicles with Porous Media Insert Modeled at REV Scales

University Of Rome TOR VERGATA-Gino Bella
University of Rome Niccolò Cusano-Daniele Chiappini, Laura Tribioli
  • Technical Paper
  • 2019-24-0242
To be published on 2019-10-07 by SAE International in United States
Lithium ion batteries are the most promising candidates for electric and hybrid electric vehicles, owe to their ability to store higher electrical energy. As a matter of fact, in automotive applications, these batteries undergo frequent and fast charge and discharge processes, which are associated to internal heat generation, which in turns causes temperature increase. Thermal management is therefore crucial to keep temperature in an appropriate level for safe operation and battery wear prevention. In a recent work authors have already demonstrated the capabilities of a coupled lattice Boltzmann-Finite Volume Method to deal with thermal transient of a three dimensional air-cooled Li-ion battery at different discharging rates and Reynolds numbers. Here, in order to improve discharge thermal capabilities and reduce temperature levels of the battery itself, a layer of porous medium is placed in contact with the battery so to replace a continuum solid aluminum layer. Many studies, which have already demonstrated how the porous media can improve thermal performance of heat exchange systems, are present in recent literature. There is a large number of models…
 

Quantification of Linear Approximation Error for Model Predictive Control of Spark-Ignited Turbocharged Engines

Clemson University-Rohit Koli, Daniel Egan, Qilun Zhu, Robert Prucka
  • Technical Paper
  • 2019-24-0014
To be published on 2019-09-09 by SAE International in United States
Modern turbocharged spark-ignition engines are being equipped with an increasing number of control actuators to meet fuel economy, emissions, and performance targets. The response time variations between engine control actuators tend to be significant during transients and necessitate highly complex actuator scheduling routines. Model Predictive Control (MPC) has the potential to significantly reduce control calibration effort as compared to the current methodologies that are based on decentralized feedback control strategies. MPC strategies simultaneously generate all actuator responses by using a combination of current engine conditions and optimization of a control-oriented plant model. To achieve real-time control, the engine model and optimization processes must be computationally efficient without sacrificing effectiveness. Most MPC systems intended for real-time control utilize a linearized model that can be quickly evaluated using a sub-optimal optimization methodology. Online linearization of the engine model is computationally expensive so it should be performed as infrequently as possible. Since engine dynamics are non-linear, a local linearity approximation error occurs during this process. This research presents a method of evaluating the impact of local linear approximation…
 
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NUT, PLAIN, HEXAGON, CHECK, UNS S66286 130 KSI MIN

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS9361B
  • Current
Published 2019-08-15 by SAE International in United States
No Abstract Available.
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NUT, SELF-LOCKING, PLATE, TWO LUG, LOW HEIGHT, UNS S66286, CLASS: 125 KSI/800 °F

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3478D
  • Current
Published 2019-08-15 by SAE International in United States
No Abstract Available.
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NUT, PLAIN, HEXAGON - DRILLED, SILVER PLATED - UNS S66286, 130 KSI MIN

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS9360C
  • Current
Published 2019-08-15 by SAE International in United States
No Abstract Available.
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NUT, FLOATING, SELF-LOCKING, ATTACHED RETENTION ELEMENT, 450 °F, 125 KSI FTU, UNS S66286

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3601A
  • Current
Published 2019-08-15 by SAE International in United States
No Abstract Available.
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DESIGN STANDARD, NUT, SELF-LOCKING, ACCESSORY MOUNTING

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS1050A
  • Current
Published 2019-08-15 by SAE International in United States
No Abstract Available.
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