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FTIR evaluation on the fuel stability of calophyllum inophyllum biodiesel: Influence of tert-butyl hydroquinone (TBHQ) antioxidant
Springer Science and Business Media LLC - Tập 31 - Trang 3611-3617 - 2017
‘Storage oxidation stability’ is one of the most significant criteria for appraising the biodiesel quality. Poor oxidation stability is the chief technical blockage related with the commercialization of biodiesel. The present paper investigates the effects of Tert- butyl hydroquinone (TBHQ) antioxidant additive concentrations on the long-term storage stability, thermal stability and accelerated ox...... hiện toàn bộ
Effect of air chambers on the compression wave propagating along a high-speed railway tunnel
Springer Science and Business Media LLC - Tập 37 - Trang 793-805 - 2023
An array of air chambers embedded on the tunnel track is numerically investigated for different configurations. The air chambers act as an in-tunnel countermeasure to alleviate non-linear steepening of compression waves during propagation process thereby mitigating emission of high amplitude micro-pressure waves (MPWs) from the exit portal. The air chambers are designed to entrap the incoming flow...... hiện toàn bộ
Spray characteristics of the rotating fuel injection system of a micro-jet engine
Springer Science and Business Media LLC - Tập 24 - Trang 551-558 - 2010
In micro-turbojet engines with less than 350 kW power, it is not easy to find a suitable fuel injector with good spray quality. However, the rotating fuel injection system can potentially provide high atomization quality without the high-pressure fuel pump through the centrifugal forces of the engine shaft. With this motivation, a very small rotating fuel injector with 40 mm diameter is designed f...... hiện toàn bộ
Full-state-feedback, Fuzzy type I and Fuzzy type II control of MEMS accelerometer
Springer Science and Business Media LLC - Tập 32 - Trang 793-798 - 2018
This paper presents classic and knowledge-based intelligent controllers for regulation of a vibratory MEMS accelerometer. The proposed methods comprise Fuzzy type I (FTI), Fuzzy type II (FTII) and Full-state-feedback (FSF) control systems. An ideal model of sensor under FSF controller is used to generate the required reference data to train if-then rule-base and Membership functions (MFs) of both ...... hiện toàn bộ
An improved correlation to predict the heat transfer in pulsating heat pipes over increased range of fluid-filling ratios and operating inclinations
Springer Science and Business Media LLC - Tập 34 - Trang 2637-2646 - 2020
Previous correlations that have been used to predict the heat transfer performance of pulsating heat pipes (PHPs) offer limited thermal predictions within a narrow range of fluid-filling ratios and PHP inclinations. In this paper, a novel semi-empirical correlation with improved scope is proposed, with an increased range of fluid-filling ratios and PHP inclinations. The proposed correlation employ...... hiện toàn bộ
Deep forest based intelligent fault diagnosis of hydraulic turbine
Springer Science and Business Media LLC - Tập 33 - Trang 2049-2058 - 2019
Deep neural networks (DNNs) for intelligent machinery fault diagnosis require a large amount of training data, powerful computational facilities and have many hyper-parameters that have to be carefully tuned to ensure maximum performance. Deep forest, as a novel alternative to the deep learning framework, has the potential to overcome these shortcomings. In this study, a deep forest-based end-to-e...... hiện toàn bộ
Prediction of bend force and bend angle in air bending of electrogalvanized steel using response surface methodology
Springer Science and Business Media LLC - Tập 27 - Trang 2093-2105 - 2013
This paper presents the development of predictive models for bend force and final bend angle (after springback) in air bending of electrogalvanized steel sheet employing response surface methodology. The models are developed based on five-level half factorial central composite design of experiments with strain hardening exponent, coating thickness, die opening, die radius, punch radius, punch trav...... hiện toàn bộ
Vibration reduction and firing accuracy improvement by natural frequency optimization of a machine gun system
Springer Science and Business Media LLC - Tập 29 - Trang 3635-3643 - 2015
Structure vibration is known to influence the firing accuracy of a machine gun system. Studying the dynamic characteristics of the machine gun system and reducing its vibration response are crucial. Eigenfrequency optimization based on topology is an emerging vibration suppression technique that reduces structural vibration and stabilizes a machine gun system. This paper presents an effective and ...... hiện toàn bộ
Development of an air fuel control system for a domestic wood pellet boiler
Springer Science and Business Media LLC - Tập 27 - Trang 1701-1706 - 2013
Wood pellets are a kind of solid biomass energy and a renewable energy source. Made by compressing sawdust, wood pellets have a higher energy density than split firewood and wood chips. In 2007, the new and renewable energy (NRE) portion was 2.4% with respect to total primary energy in Korea. The Korean government wants to increase the new and renewable energy (NRE) portion up to 6.1% by 2020 [1]....... hiện toàn bộ
A non-iterative implicit integration method using a HHT-α integrator for real-time analysis of multibody systems
Springer Science and Business Media LLC - Tập 33 - Trang 1087-1096 - 2019
This paper proposes a non-iterative implicit integration method for real-time analysis of multibody systems. Although the implicit Euler integrator is widely used for real-time simulations, we use a HHT-α integrator to improve the accuracy of the solution. For a noniterative procedure, the HHT-α integral formula was reformed and applied to the linearized equations of motion for multibody systems. ...... hiện toàn bộ
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