The Analyses for the Casing Improvements of the MPM-20 Engine

2015 ◽  
Author(s):  
K. Ratkovská ◽  
J. Čerňan ◽  
M. Cúttová ◽  
K. Semrád
Keyword(s):  
Emission Spectra ◽  
Infrared Emission ◽  
Point Of View ◽  
Thermally Induced ◽  
Operational Conditions ◽  
Term Operation ◽  
Structural Modifications ◽  
Operational Issues ◽  
Combustor Liner

The operational issues of a small turbojet engine MPM – 20 are discussed. The engine was created by modifying the Soviet turbostarter TS – 20B/21 designed for short-term operation. It is necessary to make structural modifications that allow for the long-term operational premise of the engine. For this purpose, several analyses were focused on the thermally stressed parts. The first, a material analysis carried out on the outer casing of the combustion chamber and on the combustor liner reveals information about the mechanical properties of these structural nodes. It was necessary since there is no documentation of the engine with this information. Another analysis of the infrared emission spectra is important for monitoring operational conditions, especially from the temperature point of view. Subsequent stress analysis of the casing is based on results from previous analyses. It was used to observe the behaviour of the casing as operational conditions changed. This revealed a dangerous increase of thermally induced stress levels as temperature increased up to 150°C. Various structural modifications can be made in the future with these results, such as an application of a protective coating on the casing and combustor liner of the engine.

scholarly journals RASberry - Robotic and Autonomous Systems for Berry Production

2018 ◽  
Vol 140 (06) ◽  
pp. S14-S18
Author(s):  
Pål Johan From ◽  
Lars Grimstad ◽  
Marc Hanheide ◽  
Simon Pearson ◽  
Grzegorz Cielniak
Keyword(s):  
Control Point ◽  
Autonomous Systems ◽  
Fruit Production ◽  
Point Of View ◽  
Production Costs ◽  
Term Operation ◽  
Manual Labour ◽  
Soft Fruit ◽  
Human Robot Collaboration

The soft fruit industry is facing unprecedented challenges due to its reliance of manual labour. We are presenting a newly launched robotics initiative which will help to address the issues faced by the industry and enable automation of the main processes involved in soft fruit production. The RASberry project (Robotics and Autonomous Systems for Berry Production) aims to develop autonomous fleets of robots for horticultural industry. To achieve this goal, the project will bridge several current technological gaps including the development of a mobile platform suitable for the strawberry fields, software components for fleet management, in-field navigation and mapping, long-term operation, and safe human-robot collaboration. In this paper, we provide a general overview of the project, describe the main system components, highlight interesting challenges from a control point of view and then present three specific applications of the robotic fleets in soft fruit production. The applications demonstrate how robotic fleets can benefit the soft fruit industry by significantly decreasing production costs, addressing labour shortages and being the first step towards fully autonomous robotic systems for agriculture.

OPERATIONAL CONDITIONS OF FUNCTIONAL DURABILITY AND PERFORMANCE OF ROAD TRANSPORT ENTERPRISES

2018 ◽  
Vol 73 ◽  
pp. 39-48
Author(s):  
Joanna Krupska ◽  
Adam Mytlewski
Keyword(s):  
Operating Systems ◽  
Road Transport ◽  
Transport Processes ◽  
The Other ◽  
Operational Conditions ◽  
Term Operation ◽  
And Performance ◽  
The One

Durability and efficiency are important conditions for long-term operation ofroad transport companies. In the operating aspect, the first parameter determines the quality of the manufacturing capacity and the ability to provide repetitive transport processes. The second parameter affects the long-term ability to use resources and the subsequent results of operations. The conducted study on stability and efficiency of the operating systems of road companies indicates the existence of, on the one hand, a large variation of approaches, and on the other, a clear dominance of intense and efficient behaviour in combination with ensuring the repetitiveness of processes.

Analysis of the Flange Seal Groove Cracking in a Hydrocracking Reactor

2020 ◽  
Author(s):  
Fakun Zhuang ◽  
Wen Liu ◽  
Guoshan Xie ◽  
Shanshan Shao ◽  
Zhiyuan Han
Keyword(s):  
High Temperature ◽  
High Stress ◽  
Metallographic Analysis ◽  
Operational Conditions ◽  
Σ Phase ◽  
Term Operation ◽  
Brittle Phase ◽  
Series Of Experiments ◽  
Cracking Tendency

Abstract The hydrocracking reactor, serving at the high temperature and pressure and containing S and N elements in medium, are the key equipment in the hydrocracking plant. Due to the severe operational conditions, flange and nozzle cracking commonly occurs, especially for the seal groove between the flange and gasket. A cracked stainless flange is found in a hydrocracking reactor during parking and maintenance. Through a series of experiments including chemical composition, metallographic analysis, SEM and fracture analysis, the flange seal groove is analyzed. Under the long term operation at high temperature and high pressure, the σ phase is found in the flange material which will increase the cracking tendency. The hydrogen content measurement also proves that the material has the hydrogen embrittlement tendency. Hence, the combination of σ brittle phase and high stress causes the flange seal groove cracking. After cracking, hydrogen element enters the fracture, thus accelerating the crack growth. Therefore, in order to prevent the flange cracking, the assembly stress should be controlled in an appropriate range. If necessary, periodical inspection must be performed.

scholarly journals Forecasting the durability of public transport bus bodies depending on operating conditions

2021 ◽  
Vol 4 (1(112)) ◽  
pp. 26-33
Author(s):  
Dmytro Ruban ◽  
Lubomir Kraynyk ◽  
Hanna Ruban ◽  
Andrii Sosyk ◽  
Andriy Shcherbyna ◽  
...  
Keyword(s):  
Public Transport ◽  
Operating Conditions ◽  
The Body ◽  
Body Frame ◽  
Operational Conditions ◽  
Term Operation ◽  
Study Results ◽  
Depth Study ◽  
Bus Body

This paper addresses the issue related to forecasting the durability indicators of public transport buses under operational conditions. It has been established that when buses are operated to transport passengers the bus bodies wear at different intensities. During operation, the strength of the body frame weakens under the influence of corrosion in combination with sites of fatigue destruction. As it was established, the intensity of corrosion of the bus body depends on the number of residents in the city where the bus is operated. The earlier established dependences were taken into consideration; the current study has identified two conditional variants of corrosion evolution based on the number of inhabitants: up to 1 million and exceeding 1 million. The expediency of repairs and their impact on the bus passive safety has been analyzed. It was found that the elements of the body frame, without external characteristic damage, no longer meet the specified conditions of strength as a result of sign-alternating loads and during long-term operation. Determining the durability of the bus body was made possible through the construction of a mathematical model. The model’s adequacy was confirmed by road tests of the bus. The devised model describes the movement of the bus over a road surface with different micro profiles, with different corrosion penetration, different loading by passengers, and bus speeds. It was established that the reason for the evolution of structural corrosion is the influence of salt mixtures preventing the icing of roads, as well as ignoring the washing of buses after such trips. It is recommended to use new software for the in-depth study into this issue addressing the combination of various factors of destruction: cyclic loads at variable bus speeds and the corrosion progress. The study results could make it possible to predict a life cycle of the body frame under factors that correspond to actual operating conditions.

Sediment and biofilm affect disinfectant decay rates during long-term operation of simulated reclaimed water distribution systems

2020 ◽  
Vol 6 (6) ◽  
pp. 1615-1626 ◽  
Author(s):  
Ni Zhu ◽  
Kris Mapili ◽  
Haniyyah Majeed ◽  
Amy Pruden ◽  
Marc A. Edwards
Keyword(s):  
Water Chemistry ◽  
Distribution Systems ◽  
Water Distribution ◽  
Reclaimed Water ◽  
Water Distribution Systems ◽  
Decay Rates ◽  
Operational Conditions ◽  
Term Operation ◽  
Microbial Regrowth

Unique water chemistry and operational conditions of reclaimed water distribution systems facilitated accumulation of sediment which resulted in depletion of disinfectants and microbial regrowth.

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