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  • SAGE Publications  (6)
  • 2015-2019  (6)
  • Technik  (6)
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  • SAGE Publications  (6)
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  • 2015-2019  (6)
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  • Technik  (6)
RVK
  • 1
    Online-Ressource
    Online-Ressource
    Prediction and control of the structure-borne noise of a vehicle based on an optimization technique of the vehicle-body model
    SAGE Publications ; 2015
    In:  Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering Vol. 229, No. 11 ( 2015-09), p. 1457-1468
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, SAGE Publications, Vol. 229, No. 11 ( 2015-09), p. 1457-1468
    Kurzfassung: A novel optimization approach is proposed for the development of the body-in-white model of a hatchback car based on the effective independence–weighted average acceleration amplitude method and the modal assurance criterion. By employing this optimization method, not only are the modal frequency and the mode shape identified more accurately, but also the experimental efficiency is significantly improved. According to the level of concern of the vibration mode, weighted factors are given to the modal features in order to make the sensor arrangement more efficient and reasonable. The target parameters are obtained by a sensitivity analysis of the design parameters of the hatchback car and an optimization is carried out. An acoustic–structural coupled model is developed on the basis of the optimized body-in-white model and used for prediction of the interior structure-borne noise of the hatchback car. The predicted results of the sound pressure level show good agreement with the experimental data, particularly at the frequencies concerned. By using the multi-position multi-frequency method, the mean acoustic contribution coefficient is proposed, and the panels with significant influence on the interior noise are identified. Accordingly, some modifications of the car body are made by using damping material. As a result, the interior noise decreases totally in the range from 10 Hz to 60 Hz. Some significant reductions are obtained at 23.34 Hz and 46.68 Hz, namely 4.1 dB(A) and 2.5 dB(A) at the position of the driver’s right ear and 4.6 dB(A) and 3.5 dB(A) at the middle of the rear seat.
    Materialart: Online-Ressource
    ISSN: 0954-4070 , 2041-2991
    URL: Article
    DOI: 10.1177/0954407014564779
    RVK:
    ZO 4200
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2015
    ZDB Id: 2032754-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Fuzzy logic control for a hydraulic hybrid excavator based on torque prediction and genetic algorithm optimization
    SAGE Publications ; 2018
    In:  Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering Vol. 232, No. 8 ( 2018-07), p. 983-994
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, SAGE Publications, Vol. 232, No. 8 ( 2018-07), p. 983-994
    Kurzfassung: Optimization of the control strategy, whose primary mission is to solve the problem associated with energy management, is an effective way to minimize the fuel consumption of the hydraulic hybrid excavator. As a widely used control strategy, fuzzy logic control can be adopted to realize suboptimal power split with robustness and adaptation, which is one of the most logical approaches for multidomain, nonlinear and time-varying plant. However, the membership functions are difficult to determine according to manual experiences; meanwhile, the optimization-based membership functions are difficult to utilize in real time control. This paper aims to improve the fuel consumption of a hydraulic hybrid excavator by proposing a fuzzy control strategy whose membership functions are optimized by the genetic algorithm, which considers predicted torque of the internal combustion engine (ICE) as a known quantity to realize real time control. The needed torque of the ICE is predicted by superposition of the previous torque. A fuzzy logic control strategy is then designed with membership functions optimized by the genetic algorithm according to the predicted needed torque to achieve better performance. Finally, a numerical experiment is carried out to verify the proposed control strategy.
    Materialart: Online-Ressource
    ISSN: 0954-4070 , 2041-2991
    URL: Article
    DOI: 10.1177/0954407017724590
    RVK:
    ZO 4200
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2018
    ZDB Id: 2032754-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    A feasible approach for enhancing union dyeing of wool/acrylic blend fabrics with heterobifunctional cationic reactive dyes
    SAGE Publications ; 2019
    In:  Textile Research Journal Vol. 89, No. 23-24 ( 2019-12), p. 5085-5095
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 89, No. 23-24 ( 2019-12), p. 5085-5095
    Kurzfassung: In this work, a facile method to enhance union dyeing with cationic reactive dyes on wool/acrylic blend fabrics was reported. Three cationic reactive dyes containing various numbers of reactive groups were synthesized and employed on wool, acrylic and wool/acrylic blend fabrics using the one-bath one-step method. Factors affecting the dye exhaustion, union dyeing and leveling properties, including dyeing pH, temperature and dye structure, were investigated. Experimental results revealed that the cationic reactive dye containing heterobifunctional reactive groups and a cationic group attached on the backbone of structure exhibited better union dyeing properties, irrespective of dyeing method. The improvement in the union dyeing on wool and acrylic fabrics followed a decreasing order: Dye 1  〉  Dye 3  〉  Dye 2. In additional, the wool/acrylic blend fabrics dyed with Dye 1 showed outstanding leveling properties. The fastness properties of wool/acrylic fabrics for all cationic reactive dyes were good to excellent.
    Materialart: Online-Ressource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517519849452
    RVK:
    ZS 0001
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2019
    ZDB Id: 2209596-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    A predictive Livengood–Wu correlation for two-stage ignition
    SAGE Publications ; 2016
    In:  International Journal of Engine Research Vol. 17, No. 8 ( 2016-10), p. 825-835
    Details
    In: International Journal of Engine Research, SAGE Publications, Vol. 17, No. 8 ( 2016-10), p. 825-835
    Kurzfassung: The Livengood–Wu correlation has been widely used to predict the state of auto-ignition in internal combustion engines, although its application to two-stage ignition processes remains unresolved. In this study, the original Livengood–Wu integral is extended to such two-stage ignition process and applied to simulations of typical operations within homogeneous charge compression ignition engines. Specifically, based on recent understanding of the global and detailed kinetics of low-temperature chemistry leading to ignition, simplified Arrhenius-based global reaction expressions were developed for both stages of constant-state auto-ignition. It is shown that the original Livengood–Wu integral works well for the first-stage ignition delay, as demonstrated in previous studies. Furthermore, by also accurately describing the cool flame temperature and pressure increment at the end of the first-stage ignition, the second-stage ignition delay can in addition be coupled with the first-stage ignition and predicted satisfactorily with a second integral. This formulation is then applied to extensive homogeneous charge compression ignition engine operation conditions, showing satisfactory predictive capability.
    Materialart: Online-Ressource
    ISSN: 1468-0874 , 2041-3149
    URL: Article
    DOI: 10.1177/1468087415619516
    RVK:
    ZG 1100
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2016
    ZDB Id: 2030603-9
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Pre-treatment of Calotropis gigantea fibers with functional plasticizing and toughening auxiliary agents
    SAGE Publications ; 2019
    In:  Textile Research Journal Vol. 89, No. 19-20 ( 2019-10), p. 3997-4006
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 89, No. 19-20 ( 2019-10), p. 3997-4006
    Kurzfassung: Calotropis gigantea ( C. gigantea) has not yet been utilized in the textile industry due to its poor spinning capability. Here, we demonstrate the use of a functional auxiliary agent to improve the spinning possibility of C. gigantea fibers. Firstly, a functional plasticizing and toughening auxiliary agent (PTAA) with concentrations of 6%, 9%, and 12% (w/w) were sprayed on C. gigantea fibers, which were then dried at various drying temperatures for different drying periods. The physical properties, secondary structure, crystallization, and weight gain rate were examined before and after the processing treatment, and compared to another two commonly used commercial auxiliary agents, namely waterborne polyurethane and wook lubricating oil. The maximum breaking strength was achieved when the optimum concentration of the PTAA was 9 wt.%, the optimum drying temperature was 80℃, and the optimum time was 1 h. The C. gigantea fiber treated by the PTAA had better spinning possibility compared to the fibers treated by the other two commercial auxiliary agents in terms of weight gain rate ( p  〈  0.001), initial modulus ( p  〈  0.05), and reduced crystallinity (35.6%). The results showed that PTAA treatment is an effective way to improve the spinning possibility of C. gigantea fibers. The development of our new auxiliary agent and understanding of its effects on improving the spinning possibility of C. gigantea fibers could facilitate the development of C. gigantea fibers as a lignocellulosic raw material for applications in industrial textiles.
    Materialart: Online-Ressource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517519826885
    RVK:
    ZS 0001
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2019
    ZDB Id: 2209596-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Short-term creep behavior of multi-axial warp knitted fabric-reinforced polyethylene matrix composites
    SAGE Publications ; 2019
    In:  Textile Research Journal Vol. 89, No. 8 ( 2019-04), p. 1522-1532
    Details
    In: Textile Research Journal, SAGE Publications, Vol. 89, No. 8 ( 2019-04), p. 1522-1532
    Kurzfassung: Short-term creep experiments of composites of polyethylene reinforced with polyester fiber multi-axial warp knitted (MWK) fabrics were carried out for tensile and shear modes in three directions. This work primarily focuses on using the Burgers and Findley models to obtain parameters associated with stress level, temperature, and structure of MWK fabrics. Specifically, the material parameter A of the Findley model has higher values at elevated temperatures, which is contrary to the impact of fiber content along the loading direction. The material parameter n rises with an increasing temperature and is not affected by the fiber content. In terms of the Burger parameters, material parameters E 1 , E 2 , and η 1 have a downside as temperature increases. The relationship of these parameters with fiber content is contrary to their relationship with temperature. There is no significant effect of temperature and fiber content on relaxation time, whereas there is an upward trend of relaxation time with increases in stress.
    Materialart: Online-Ressource
    ISSN: 0040-5175 , 1746-7748
    URL: Article
    DOI: 10.1177/0040517518775910
    RVK:
    ZS 0001
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2019
    ZDB Id: 2209596-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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