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  • SAGE Publications  (4)
  • 1
    Online Resource
    Online Resource
    Multiple limit-cycles shimmy characteristics of dual-axle steering mechanism considering the wheel alignment parameters
    SAGE Publications ; 2020
    In:  Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Vol. 234, No. 17 ( 2020-09), p. 3360-3379
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, SAGE Publications, Vol. 234, No. 17 ( 2020-09), p. 3360-3379
    Abstract: In this study, a nine degree of freedom mathematical model of dual-axle steering mechanism considering the wheel alignment parameters is established. Taking one multi-axle vehicle with dual-axle mechanism for example, the numerical method is used to analyze the effects of the wheel alignment parameters on multiple limit-cycles shimmy characteristics. The results show that the variation of the camber angle, the toe angle, and the caster angle will cause the maximum swing angles of first and second axle and the speed ranges of multiple limit-cycles shimmy to change. In addition, taking the caster angle as an example, the effects of matching of different wheel alignment parameters for the first and second axle on multiple limit-cycles shimmy characteristics were discussed. It is found that the effects which the caster angle of second axle having on multiple limit-cycles shimmy characteristics of dual-axle steering mechanism are much more greater than the caster angle of first axle's effects. This finding can provide theoretical guidance for suppressing multiple limit-cycles shimmy of the multi-axle vehicle with dual-axle steering mechanism.
    Type of Medium: Online Resource
    ISSN: 0954-4062 , 2041-2983
    URL: Article
    DOI: 10.1177/0954406220915499
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2024890-8
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Self-excited vibration of whole vehicle with multiple limit cycles induced by shimmy of front wheels
    SAGE Publications ; 2020
    In:  Journal of Low Frequency Noise, Vibration and Active Control Vol. 39, No. 4 ( 2020-12), p. 1052-1064
    Details
    In: Journal of Low Frequency Noise, Vibration and Active Control, SAGE Publications, Vol. 39, No. 4 ( 2020-12), p. 1052-1064
    Abstract: Front wheel shimmy may induce the self-excited vibration of whole vehicle with multiple limit cycles. This kind of shimmy is difficult to control and can do great harm to the vehicle. In order to obtain the mechanism of this phenomenon, a 7-DOF dynamic model of whole vehicle self-excited vibration induced by the shimmy of front wheels which take the nonlinear factor of tire lateral force and the dry friction force in suspension and steering system into consideration was established. By using Hopf bifurcation theorem and central manifold theorem, the existence and stability of limit cycles are qualitatively determined. By means of numerical analysis, the self-excited vibration with multiple limit cycles is found. The results show that in the speed range of 50–185 km/h, front wheels shimmy induced the self-excited vibration of whole vehicle and the amplitude of system’s vibration decreases with the increase of vehicle speed; in the speed range of 50–83 km/h and 149–185 km/h, the self-excited vibration with multiple limit cycles occurs; in the speed range of 83–149 km/h, the self-excited vibration with single limit cycle occurs.
    Type of Medium: Online Resource
    ISSN: 1461-3484 , 2048-4046
    URL: Article
    DOI: 10.1177/1461348419855464
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2025887-2
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  • 3
    Online Resource
    Online Resource
    Biodegradable star-shaped polycyclic ester elastomers: Preparation, degradability, protein release, and biocompatibility in vitro
    SAGE Publications ; 2017
    In:  Journal of Bioactive and Compatible Polymers Vol. 32, No. 2 ( 2017-03), p. 178-195
    Details
    In: Journal of Bioactive and Compatible Polymers, SAGE Publications, Vol. 32, No. 2 ( 2017-03), p. 178-195
    Abstract: Effective local delivery methods for sustained and stable release of protein drugs are urgently needed. Biodegradable elastomers based on star-shaped polycyclic esters have received attention for their drug-loading and drug-release kinetics. However, the long degradation periods resulting from their strong lipophilicity greatly hinder their application. In this study, we synthesized new cross-linked elastomers based on methyl-acrylic-star-poly(ϵ-caprolactone- co-d,l-lactide) cyclic ester and methyl-bi-acrylic-poly(ϵ-caprolactone-b-poly(ethylene glycol)-b-ϵ-caprolactone) with different molecular weights; determined their physical, thermal, and morphological characteristics; and studied their in vitro degradation and release of bovine serum albumin and recombinant human interleukin 2. Elastomer hydrophilicity improved with the introduction of methyl-bi-acrylic-poly(ϵ-caprolactone-b-poly(ethylene glycol)-b-ϵ-caprolactone), and a shorter degradation period (~25 weeks) was achieved. Additionally, the degradation rate could be adjusted by varying the composition of methyl-bi-acrylic-poly(ϵ-caprolactone-b-poly(ethylene glycol)-b-ϵ-caprolactone) to directly influence the degree of swelling, cross-linking density, and sol content of the elastomer. The controlled rate of bovine serum albumin and recombinant human interleukin 2 release increased with a larger degree of swelling, higher sol content, and lower cross-link density of the elastomers. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide analysis showed good biocompatibility. These results suggest that these new elastomers are potential candidates for carrier materials in controlled, implantable delivery systems for protein drugs and other biomedical applications.
    Type of Medium: Online Resource
    ISSN: 0883-9115 , 1530-8030
    URL: Article
    DOI: 10.1177/0883911516664194
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2073790-7
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  • 4
    Online Resource
    Online Resource
    Different properties of poly(L-lactic acid) monofilaments and its corresponding braided springs after constrained and unconstrained annealing
    SAGE Publications ; 2022
    In:  Journal of Biomaterials Applications Vol. 37, No. 3 ( 2022-09), p. 517-526
    Details
    In: Journal of Biomaterials Applications, SAGE Publications, Vol. 37, No. 3 ( 2022-09), p. 517-526
    Abstract: Thermal annealing is widely applied to enhance the mechanical performance of PLLA monofilaments, which brings in a variety of expected strengths through different constrained methods. In this work, samples with constrained and unconstrained annealing process were both prepared and characterized, including mechanical performance, surface morphology, radial supporting performance and axial flexibility. Experimental results revealed that the monofilaments under constrained annealing showed higher elastic modulus with 6.4 GPa, which were higher than those without any constraint. While the maximal elongation at break with 51.11% were observed in unconstrained annealed monofilaments. Few changes were presented in the molecular weight between the two types of samples. Moreover, the springs under constrained annealing inhibited the most reliable radial supporting performance with higher radial compression force and chronic outward force, 0.665  N/mm and 0.14  N respectively. However, unconstrained annealing springs showed better flexibility with 0.178  N bending stiffness and 1.58  N maximum bending force. These results suggested that filaments and springs with various properties can be obtained under different annealing conditions.
    Type of Medium: Online Resource
    ISSN: 0885-3282 , 1530-8022
    URL: Article
    DOI: 10.1177/08853282221095926
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2072559-0
    SSG: 12
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