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Design, Synthesis and Analysis of Loader Bucket, Boom and Linkages for Amphibious Infantry Combat Vehicle

Independent Researcher-Abhijit Kulkarni
Konecranes-Akhilesh Kulkarni
Published 2019-10-11 by SAE International in United States
Currently, for various military activities such as construction of bridges, digging trenches, construction of roads and clearing the area during landslides, separate unit of bulldozer for dozing operation and loader for loading operation is required. But the need is to develop a single unit which could perform both of these operations efficiently and simultaneously. The paper discusses about the development of dozer bucket mechanism as a single unit to perform dozing and loading operation and connected to the amphibious infantry combat vehicle. To develop the dozer bucket mechanism synthesis of mechanism (Linkages and Boom) has carried out and care has taken to fulfill the above stated functional requirement and satisfy the geometrical constraints. The synthesis of mechanism is done with the help of ‘CATIA’ software packages. The force calculation on various joints at the different position of mechanism has evaluated with the help of ’ADAMS’ software. The finite element analysis has done using software ’ANSYS’. The developed mechanism combines the dozing and loading operation and connected to the tracked vehicle.
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The Effects of Mid-Channel Ash Plug on DPF Pressure Drop

Independent Researcher-Yujun Wang
Massachusetts Institute of Technology-Carl Kamp
Published 2016-04-05 by SAE International in United States
It has been observed that a certain percentage of diesel particulate filters (DPFs) from the field form mid-channel ash plugs both in light duty and heavy duty applications. As revealed in a post mortem study, some field samples have ash plugs of 3-10 cm length in the middle of DPF inlet channels, which can potentially reduce the inlet channel volume by more than 50%. As a result, the mid-channel ash plug reduces the effective filtration area and decreases the effective channel open width in the middle of the channel. This explains why these filters are reported as having large increases in pressure drop. Moreover, the mid-channel ash deposits reduce the DPF service life and render the filter cleaning process ineffective.In the present study, an open source CFD tool is applied to study the 3D flow crossing two representative inlet and outlet DPF channels where the inlet channels have mid-channel ash plugs. A systematic grid convergence study is conducted to ensure that the CFD results are grid independent. A heavy duty DPF is investigated and the…
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Towards a stochastic in-flight thrust determination process

Independent Researcher-João Carlos Hoff
Published 2007-11-28 by SAE International in United States
Traditionally jet engines in-flight thrust determination is a deterministic process that starting from the fan and core measured pressures and temperatures calculates, by many different ways, the intermediate turbomachine parameters up to the exhaust nozzle pressure and temperature while iteratively search for the engine mass flow, attending simultaneously energy, mass and momentum conservation. With this data and the previously determined nozzle coefficients, the engine installed thrust is calculated. These methods are industry standards that are well documented on SAE reports AIR 1703A and AIR 5450. A new approach is proposed in this work, a more stochastic approach, which in fact estimates the engine fan and core pressures and temperatures from initial air mass flow and gross thrust values. Using the Output-Error Method the values of gross thrust and air mass flow are iteratively updated by a modified Newton-Raphson algorithm minimizing the error between the fan and core calculated and measured air pressures and temperatures. The new technique solves in fact, by optimization, the inverse formulation of the in-flight thrust determination problem. The advantages of the…
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