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  1. Article ; Online: The Numerical Study for the Effect of Stiffness Matching on Wheel–Rail Curve Squeal Noise

    Yanxin Gao / Gongde Zhang / Miaomiao Yuan / Jianyi Ji / Nannan Cui / Shiping Huang

    Applied Sciences, Vol 13, Iss 21, p

    2023  Volume 11615

    Abstract: This study delves into the phenomenon of high-frequency squeal noise occurring as trains traverse small-radius curved tracks and investigates the factors influencing wheel–rail curve squeal noise, particularly focusing on stiffness matching. To achieve ... ...

    Abstract This study delves into the phenomenon of high-frequency squeal noise occurring as trains traverse small-radius curved tracks and investigates the factors influencing wheel–rail curve squeal noise, particularly focusing on stiffness matching. To achieve this, we initially construct a finite element model of the wheel–rail friction system using finite element software ABAQUS 2022, validating its accuracy against Coulomb’s friction law. Subsequently, we employ complex eigenvalue analysis to extract the complex eigenvalues and vibration modes of the wheel–rail system, enabling us to study the positions and vibrational patterns associated with squeal noise by analyzing the amplitudes of unstable modes. Finally, we assess the impact of wheel–rail stiffness matching on curve squeal noise, using wheel–rail material stiffness and rail support stiffness as key variables. The outcomes of this study reveal the following insights: (1) Unstable modes closely align with the resonant frequency and mode shape of the wheel and rail. (2) Curve squeal noise primarily emanates from vibrations at the rim, railhead, and rail foot. (3) Wheel and rail stiffness significantly affect squeal noise, with a significant deviation in the elastic modulus between rail and wheel increasing the likelihood of squeal noise, while an optimal ratio of about 1.2 is observed. (4) Rail support stiffness plays a discernible role in controlling curve squeal noise. Theoretically, maintaining an appropriate support stiffness level can minimize the negative damping ratio of unstable modes, providing a viable avenue for curve squeal noise control.
    Keywords curve squeal noise ; finite element ; stiffness matching ; complex mode ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 690
    Language English
    Publishing date 2023-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Mitofusin2 Promotes

    Lu, Li / Zhitao, Li / Nannan, Cui / Mingzhu, Huang / Xiaoping, Hu / Dongsheng, Hong / Zongfu, Pan / Xiaoyang, Lu

    Stem cells international

    2022  Volume 2022, Page(s) 1172795

    Abstract: ... ...

    Abstract β
    Language English
    Publishing date 2022-03-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2573856-2
    ISSN 1687-9678 ; 1687-966X
    ISSN (online) 1687-9678
    ISSN 1687-966X
    DOI 10.1155/2022/1172795
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: 3D printing hydrogel with graphene oxide is functional in cartilage protection by influencing the signal pathway of Rank/Rankl/OPG.

    Cheng, Zhong / Landish, Bolaky / Chi, Zhang / Nannan, Cui / Jingyu, Du / Sen, Lu / Xiangjin, Lin

    Materials science & engineering. C, Materials for biological applications

    2018  Volume 82, Page(s) 244–252

    Abstract: 3Dprinting is defined as the use of printing technology to deposit living cells, and biomaterials on a given /a substrate. Graphene oxide nanoparticles (GO-np) have been used as a delivery vehicle for small molecule drugs in order to investigate the ... ...

    Abstract 3Dprinting is defined as the use of printing technology to deposit living cells, and biomaterials on a given /a substrate. Graphene oxide nanoparticles (GO-np) have been used as a delivery vehicle for small molecule drugs in order to investigate the state of GO-np within 3D tissue constructs in terms of a composite 3D printing scaffold, which in turn is relevant to the protection of cartilage. We transplanted rats with hydrogel/GO-np and hydrogel, which in turn showed that hydrogel/GO-np protected the tissue of cartilage by the signal pathway of Rank/Rankl/OPG. Those findings indicated that GO-np may be potentially used to control the release of carrier materials and influence the signal pathway of Rank/Rankl/OPG.
    Language English
    Publishing date 2018-01-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2012160-X
    ISSN 1873-0191 ; 0928-4931
    ISSN (online) 1873-0191
    ISSN 0928-4931
    DOI 10.1016/j.msec.2017.08.069
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Comparison of post-operative short-term and long-term outcomes between occult and frank biliary rupture of hydatid disease.

    Shalayiadang, PaiZula / Muzaffar, Iqbal / Yusp-Yimit / Turxun, Ajim / Nannan, Cui / Wen, Hao

    Hepato-gastroenterology

    2014  Volume 61, Issue 130, Page(s) 431–435

    Abstract: Background/aims: Intrabiliary rupture (IBR) is the most common and serious complication of hepatic hydatid cyst (HHC). The aim of this retrospective study was to evaluate postoperative short-term and long-term outcome of patients treated surgically for ... ...

    Abstract Background/aims: Intrabiliary rupture (IBR) is the most common and serious complication of hepatic hydatid cyst (HHC). The aim of this retrospective study was to evaluate postoperative short-term and long-term outcome of patients treated surgically for complicated liver hydatid cysts.
    Methodology: A total of 168 cases with biliary communication of hydatid cyst were analyzed retrospectively, 92 of which had biliary communication with an occult rupture while 76 (45.23%) had Frank biliary rupture. Preoperative demography, ultrasonic cyst features, postoperative short-term complications, postoperative follow-up (long-term) complications and hospital stay were recorded and analyzed.
    Results: There were no differences in the demographic characteristics and preoperative cyst features in Frank and occult group. Compared with the Frank group 9.34 +/- 1.25 (days), the postoperative stay in occult 6.97 +/- 1.62 (days) were relatively shorter. The incidence of overall postoperative short-term complications and long-term complications were insignificantly lower in occult group (22.82%) than Frank group (30.26%) with P = 0.275. Incidence of postoperative biliary leakage 8 (8.69%) and abscess 5 (5.43%) in occult group was insignificantly more common than Frank rupture with biliary leakage 5 (6.5%) and abscess 2 (2.63%) with P value was 0.609 and 0.365 respectively while long-term biliary stricture is significantly greater in Frank group (10.52%) then occult group (0%) with P = 0.01.
    Conclusions: Frequency of occurrence of postoperative short-term complications biliary fistula and abscess is relatively more common in occult rupture with transcystic drain due to its indolent course, inability to find and suture the rupture orifice, and incomplete decompression while biliary stricture is significantly more common in Frank group due to its involvement of major bile ducts.
    MeSH term(s) Adult ; Aged ; Echinococcosis, Hepatic/pathology ; Echinococcosis, Hepatic/surgery ; Female ; Humans ; Length of Stay ; Male ; Middle Aged ; Occult Blood ; Postoperative Complications/etiology ; Retrospective Studies ; Rupture, Spontaneous/surgery ; Treatment Outcome
    Language English
    Publishing date 2014-03
    Publishing country Greece
    Document type Journal Article
    ZDB-ID 801013-4
    ISSN 0172-6390
    ISSN 0172-6390
    Database MEDical Literature Analysis and Retrieval System OnLINE

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