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  • SAGE Publications  (9)
  • Yang, Gang  (9)
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  • SAGE Publications  (9)
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  • 1
    Online Resource
    Online Resource
    Feedback linearization-based self-tuning fuzzy proportional integral derivative control for atmospheric pressure simulator
    SAGE Publications ; 2014
    In:  Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering Vol. 228, No. 6 ( 2014-07), p. 385-392
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, SAGE Publications, Vol. 228, No. 6 ( 2014-07), p. 385-392
    Abstract: A new robust nonlinear controller is proposed to improve the performance of the atmospheric pressure simulator that has some special characteristics such as asymmetry and nonlinearity. The three major components in such systems, the chamber, the servo valve and the vacuum pump, are studied to develop a full nonlinear model which encompasses all the major nonlinearities. Based on the model expressed in the controllability canonical form, a feedback linearization controller is developed to handle the strong asymmetry and nonlinearity of the atmospheric pressure simulator. Considering the parametric uncertainties and un-modeled dynamics existing in the atmospheric pressure simulator, a self-tuning fuzzy proportional integral derivative controller integrating with feedback linearization is introduced to improve the performance of the atmospheric pressure simulator at high-altitude simulations. Simulations and experiments indicate that the proposed controller can effectively raise the dynamic response performance, and in the meantime stability can be ensured.
    Type of Medium: Online Resource
    ISSN: 0959-6518 , 2041-3041
    URL: Article
    DOI: 10.1177/0959651814520827
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 2024903-2
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  • 2
    Online Resource
    Online Resource
    Time-varying structural parameter identification for the offshore gangway
    SAGE Publications ; 2023
    In:  Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, SAGE Publications
    Abstract: The offshore gangway is a new type of offshore transfer equipment, equivalent to an offshore passage. This device makes it convenient for people to transfer between a vessel and an offshore structure. The control algorithm of the gangway system demands adjusting its control parameters to deal with harsh sea conditions and ensure personnel safety. Thence, it is essential to foreknow its time-varying structural parameters, such as the moment of inertia, the mass, the location of the mass center, and so on. However, due to the highly complex structure, these parameters are difficult to obtain through measurement directly. To adaptively identify these time-varying parameters for better controller design, this paper proposes a novel structural parameter identification approach based on the idea of interval division. During the identification process, the entire period is uniformly divided into several intervals. The time-varying model of the offshore gangway system can be represented in each interval by a quadratic regression equation, the coefficients of which can be derived by the least-squares algorithm. Furthermore, to adapt to the different variation frequencies and amplitudes of the parameters, the divided intervals are of distinct sizes according to the characteristics of each identification parameter. In addition, the particle swarm algorithm is employed to obtain the optimal interval sizes, the cost function of which consists of a series of output error terms. Verified by simulation, the method presented in this paper can effectively estimate the structural parameters of the offshore gangway with high accuracy, with mean square errors reduced by at least 2/3 compared to other methods proposed in previous research.
    Type of Medium: Online Resource
    ISSN: 0954-4062 , 2041-2983
    URL: Article
    DOI: 10.1177/09544062231190822
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2024890-8
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  • 3
    Online Resource
    Online Resource
    Experimental analysis of the feasibility of deep slide monitoring with low-cost piezoelectric diaphragms-based EMI technique
    SAGE Publications ; 2022
    In:  Journal of Intelligent Material Systems and Structures Vol. 33, No. 7 ( 2022-04), p. 958-971
    Details
    In: Journal of Intelligent Material Systems and Structures, SAGE Publications, Vol. 33, No. 7 ( 2022-04), p. 958-971
    Abstract: Slope instability, especially the soil slope instability, is a common occurrence in mountainous areas. It poses a huge threat to people’s lives and properties under the slope body. Effective slope monitoring techniques can provide detailed information and precursor about the real-time deformation, which is of great importance to provide early warning to the public. In this paper, a novel electromechanical impedance (EMI)-based slope deep slide monitoring bar (DSMB) was proposed. The main purpose was to investigate the application of the EMI technique for deep slide detection. In this study, a small soil slope specimen with a DSMB embedded inside it was fabricated in laboratory. To verify the practicality of the low-cost piezoelectric diaphragms (commonly known as buzzers), four conventional lead zirconate titanate (PZT) patches and four buzzers were bonded onto the front surface and back surface of the bar at specific positions, respectively. The slope specimen was then subjected to a horizontal thrust to initiate an interlayer slide along the slip surface. The whole process was monitored with a precision impedance analyzer by measuring the admittance of these transducers at specific sliding displacement. In order to reduce the error and increase the reliability, the experiment was repeated three times under the same conditions. It was concluded that the conventional PZT patches and buzzers have similar sensitivities to interlayer slide damage. The results indicate that both the severity and sliding location could be identified via the two metrics including root mean square deviation (RMSD) and correlation coefficient deviation (CCD). The experimental results verify the feasibility and practicality of using novel and low-cost piezoelectric diaphragm-based EMI technique to detect the deep slide in soil slope.
    Type of Medium: Online Resource
    ISSN: 1045-389X , 1530-8138
    URL: Article
    DOI: 10.1177/1045389X211038686
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2088313-4
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  • 4
    Online Resource
    Online Resource
    Dynamic compensation by coupled triple-thermocouples for temperature measurement error of high-temperature gas flow
    SAGE Publications ; 2023
    In:  Transactions of the Institute of Measurement and Control
    Details
    In: Transactions of the Institute of Measurement and Control, SAGE Publications
    Abstract: The gas flow temperature signal simulation system (ATSSS) plays a crucial role in the hardware-in-the-loop simulation of hypersonic aircraft. The accuracy of gas flow temperature measurements is of paramount importance for the ATSSS. This system comprises a high-temperature plasma heater, a gas flow mixing chamber, and thermocouples. The ATSSS exhibits specific characteristics such as high temperatures, rapid temperature changes, and fast flow rates. However, due to the large measurement time constant of high-temperature thermocouples, significant dynamic errors are introduced into the measurement results. To address this issue and enhance the dynamic measurement accuracy of gas flow temperature, this study establishes a thermocouple heat transfer model for the ATSSS. It also analyzes the mechanism behind the generation of dynamic errors in the ATSSS and proposes a three-thermocouple coupled temperature measurement dynamic compensation method (TTCTMDC). This method compensates for errors caused by thermal convection, thermal radiation, and thermal conduction under high-temperature conditions. Simulation results demonstrate that the proposed method can reduce errors by 50% to 80%. In addition, an experimental platform for the ATSSS is constructed, and the TTCTMDC method is employed to compensate for measurement errors. The results indicate that the dynamic measurement error can be reduced to 1/4 to 1/2 of the original value using the TTCTMDC method. This research lays a foundation for the successful development of the ATSSS and provides a novel approach to dynamically measuring high-temperature gas flow, thereby advancing scientific research in the field of measurement.
    Type of Medium: Online Resource
    ISSN: 0142-3312 , 1477-0369
    URL: Article
    DOI: 10.1177/01423312231194603
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2025882-3
    SSG: 3,2
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  • 5
    Online Resource
    Online Resource
    Suppressing water hammer of ship steering systems with hydraulic accumulator
    SAGE Publications ; 2014
    In:  Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Vol. 228, No. 2 ( 2014-05), p. 136-148
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications, Vol. 228, No. 2 ( 2014-05), p. 136-148
    Abstract: This article is a contribution to the design of the hydraulic steering system with an accumulator of different parameters on suppressing water hammer. The accurate model taking account of the characteristics of the entrance of the hydraulic accumulator, which have great influence on the frequency characteristics of the accumulator is developed. In addition, this article proposes a more comprehensive distributed parameter model of the hydraulic steering system with an accumulator installed before the proportional directional valve, which takes into account both the relief valve and the pipeline between the hydraulic accumulator and the proportional directional valve. The dynamic characteristics of the hydraulic steering system were analyzed both in the frequency and time domain. The numerical simulation of water hammer which used a holistic unsteady-friction model has been performed by the method of characteristics and finite difference method with spatial interpolation using Fortran language. The law that the natural frequency of the accumulator which is equal or approximate to the frequency of water hammer in pipeline has good effect on suppressing water hammer is validated by analytical and numerical simulations as well as experimental results, for the design of the nominal volume and charged pressure of the hydraulic accumulator in the hydraulic steering system.
    Type of Medium: Online Resource
    ISSN: 0954-4089 , 2041-3009
    URL: Article
    DOI: 10.1177/0954408913488770
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 2024897-0
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  • 6
    Online Resource
    Online Resource
    Characteristics, Thrombus Resolution, and Long-Term Outcomes in Patients with Nonvalvular Atrial Fibrillation and Atrial Thrombus
    SAGE Publications ; 2023
    In:  Clinical and Applied Thrombosis/Hemostasis Vol. 29 ( 2023-01), p. 107602962311680-
    Details
    In: Clinical and Applied Thrombosis/Hemostasis, SAGE Publications, Vol. 29 ( 2023-01), p. 107602962311680-
    Abstract: To assess the prevalence and management of atrial thrombus in patients with nonvalvular atrial fibrillation (NVAF) and identify the risk factors of the nonresolution of atrial thrombus. This single-center retrospective observational study consecutively enrolled patients with NVAF and atrial thrombus detected using transesophageal echocardiography (TEE) or cardiac computed tomography angiography (CTA) from January 2012 to December 2020. Patients with prior left atrial appendage (LAA) intervention were excluded. The primary endpoint was the presence of atrial thrombus, while the secondary endpoint was the complete resolution of atrial thrombus. The prevalence of atrial thrombus in patients with NVAF was 1.4%. Ninety patients with atrial thrombus (mean age 62.8 ± 11.9 years and 61.1% men) were finally analyzed. Atrial thrombus was in the LAA in 82 (91.1%) patients. During follow up, 60% of the patients showed complete resolution of atrial thrombus. Congestive heart failure (odds ratio [OR]: 8.94; 95% confidence interval [CI] : 1.67-47.80) and a history of ischemic stroke (OR: 8.28; 95% CI: 1.48-46.42) were independently associated with the risk of the nonresolution of atrial thrombus. The presence of atrial thrombus in patients with NVAF who received anticoagulation therapy is non-negligible. Even in anticoagulated patients, TEE or cardiac CTA might still be needed. Congestive heart failure and a history of ischemic stroke are risk factors of the nonresolution of atrial thrombus.
    Type of Medium: Online Resource
    ISSN: 1076-0296 , 1938-2723
    URL: Article
    DOI: 10.1177/10760296231168097
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2230591-9
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  • 7
    Online Resource
    Online Resource
    Effect of losartan on the glomerular protein expression profile of type 2 diabetic KKAy mice
    SAGE Publications ; 2013
    In:  Journal of Nephrology Vol. 26, No. 3 ( 2013), p. 517-526
    Details
    In: Journal of Nephrology, SAGE Publications, Vol. 26, No. 3 ( 2013), p. 517-526
    Type of Medium: Online Resource
    ISSN: 1121-8428
    URL: Article
    DOI: 10.5301/jn.5000176
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
    detail.hit.zdb_id: 1475007-7
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  • 8
    Online Resource
    Online Resource
    Association of ERCC5 Genetic Polymorphisms With Cirrhosis and Liver Cancer
    SAGE Publications ; 2020
    In:  Technology in Cancer Research & Treatment Vol. 19 ( 2020-01-01), p. 153303382094324-
    Details
    In: Technology in Cancer Research & Treatment, SAGE Publications, Vol. 19 ( 2020-01-01), p. 153303382094324-
    Abstract: To explore association of excision repair cross-complementing 5 ( ERCC5) genetic polymorphisms with cirrhosis and liver cancer. Methods: A total of 365 patients were enrolled, including control group (n = 133), cirrhosis group (n = 122), and liver cancer group (n = 110). The genotyping of ERCC5 rs2016073, rs751402, rs2094258, rs2296147, and rs2296148 was measured by using MassARRAY iPLEX technology. Results: There were no significant differences in gender and drinking among the 3 groups ( P 〉 .05). There were significant differences among the 3 groups in both age-group ≤60 and 〉 60 subgroup patients. Locus rs2016073 was significantly different among 3 groups, and genotype GG (n = 0) was not observed in liver cancer group. As for locus rs751402, there were significant differences among 3 groups, and genotype AA (n = 0) was not observed in liver cancer group. As for locus rs2094258, there were no significant differences among 3 groups. Locus rs2296147 showed no significant differences among 3 groups ( P 〉 .05), but genotype CC was not observed in liver cancer group (n = 0). As for locus rs2296148, there were significant differences among 3 groups, and genotype TC (n = 0) was not observed in cirrhosis group. Regression analysis found locus rs751402 had significant difference between control group and cirrhosis group, patients with genotype AA and genotype GG were more likely to have cirrhosis than those with genotype GA. Conclusion: Our study suggested that genotype AA, genotype GG of ERCC5 locus rs751402, and genotype TC of locus rs2296148 may be important targets for cirrhosis, while ERCC5 polymorphisms (rs2016073 and ERCC5 polymorphisms, rs2016073 with genotype GG, and rs751402 with genotype AA) may be potential markers for liver cancer.
    Type of Medium: Online Resource
    ISSN: 1533-0346 , 1533-0338
    URL: Article
    DOI: 10.1177/1533033820943244
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2146365-7
    detail.hit.zdb_id: 2220436-2
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  • 9
    Online Resource
    Online Resource
    Dynamic vacuum pressure tracking control with high-speed on-off valves
    SAGE Publications ; 2018
    In:  Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering Vol. 232, No. 10 ( 2018-11), p. 1325-1336
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, SAGE Publications, Vol. 232, No. 10 ( 2018-11), p. 1325-1336
    Abstract: A vacuum pressure tracking system with high-speed on-off valves is a discontinuous system due to the discrete nature of high-speed on-off valves. Chamber pressure changes in the system are determined by the mass flow rates during the processes of charging and discharging. Here, a sliding mode controller with an asymmetric compensator based on average mass flow rate is designed for accurate vacuum pressure tracking. The controller output signal is converted into the duty cycles of the high-speed on-off valves via a pulse width modulation pulsing scheme. Owing to the extreme asymmetry of the processes, an asymmetric structure comprising one high-speed on-off valve in the charging unit and three high-speed on-off valves in the discharging unit is applied to weaken the impact of asymmetry. In addition, an asymmetric compensator is also designed to modify the pulse width modulation pulsing scheme to further eliminate the asymmetry. Experimental results indicate that the proposed controller achieves better performance in pressure tracking with the asymmetric compensator overcoming process asymmetry and enhancing system robustness.
    Type of Medium: Online Resource
    ISSN: 0959-6518 , 2041-3041
    URL: Article
    DOI: 10.1177/0959651818780866
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2024903-2
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