Research Article
Dynamic Analysis of the Influence of Railway Vehicle Speed on Passenger Ride Comfort When Wheels Undergo Polygonization Defects
Issue:
Volume 13, Issue 2, April 2025
Pages:
53-62
Received:
24 January 2025
Accepted:
11 February 2025
Published:
7 March 2025
DOI:
10.11648/j.ijmea.20251302.11
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Views:
Abstract: The railway transportation system is currently undergoing a significant expansion. As a result, train lines are upgraded, and the technical condition of the rail vehicles that use them is also taken into consideration. However, under certain circumstances, wheels on rail vehicles may sustain damage while in use. Then, depending on the kind and degree of flaws, the profile of the wheels is no longer circular but rather changes. The quality of a passenger's ride comfort is diminished when a rail vehicle with a damaged wheel is in operation. The research considered one type of railway wheel untrueness wheel polygonization and focused on the evaluation of ride comfort for passengers based on results obtained from numerical and dynamic analyses. Simulations and calculations were carried out in numerical and dynamic multibody software. The results show that with increasing vehicle speed, the ride index also increases, which means that at high speeds, the ride comfort will be diminished. Furthermore, it found that the orders of wheel polygonization have an effect on ride comfort. With the increasing order of polygonization, the ride index also increases. According to the findings, this study has a significant impact on the maintenance planning for wheels and rails as well as operation management.
Abstract: The railway transportation system is currently undergoing a significant expansion. As a result, train lines are upgraded, and the technical condition of the rail vehicles that use them is also taken into consideration. However, under certain circumstances, wheels on rail vehicles may sustain damage while in use. Then, depending on the kind and degr...
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Research Article
Performance, Emissions, and Suitability for Mass Production of an Updraft Biomass Gasifier Cookstove: An Experimental Study
Issue:
Volume 13, Issue 2, April 2025
Pages:
63-72
Received:
11 February 2025
Accepted:
26 February 2025
Published:
7 March 2025
DOI:
10.11648/j.ijmea.20251302.12
Downloads:
Views:
Abstract: In Cameroon, renewable energy promotion is a key strategy for improving energy security and fostering employment opportunities. This study evaluates the performance, emission levels, and suitability for promotion for mass production of a novel updraft gasifier biomass cookstove. The assessment, conducted using WBT 4.2.3 protocol, focused on thermal efficiency, carbon monoxide (CO) emissions, particulate matter (PM2.5) emissions, and safety, in accordance with ISO/IWA Tier 4 standards. PM2.5 emissions were prioritised due to their significant health impacts. A Multiple Criteria Decision Analysis (MCDA) was used to assess the cookstove's potential for mass production, considering criteria such as manufacturability, scalability, fuel savings, usability, durability, maintainability, portability, cost/affordability, safety, weight, space, and cultural acceptability. The Results showed that the stove achieved Tier 2 thermal efficiency (≈25%). Indoor air quality tests revealed Tier 2 CO emissions at both low and high power, while PM2.5 emissions met Tier 3 at high power and Tier 2 at low power. The safety score was 59/100, corresponding to Tier 1. Compared to the traditional 3-stone fire, the stove demonstrated superior efficiency, indoor air quality, specific fuel consumption, and safety. In the MCDA evaluation, the stove ranked second among five models, confirming its suitability for commercial-scale production, although continuous improvement is required. This study highlights the potential of the first updraft gasifier biomass cookstove tested in Cameroon to contribute to sustainable energy solutions.
Abstract: In Cameroon, renewable energy promotion is a key strategy for improving energy security and fostering employment opportunities. This study evaluates the performance, emission levels, and suitability for promotion for mass production of a novel updraft gasifier biomass cookstove. The assessment, conducted using WBT 4.2.3 protocol, focused on thermal...
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,
Haileleoul Sahle Habte
