• Articles written in Sadhana

    • Developing experimental technology and numerical analysis model for non-linear behaviour of Bi-tilt isolator

      MING-HSIANG SHIH WEN-PEI SUNG

      More Details Abstract Fulltext PDF

      Traditional isolator is hard to control because that it is easily caused large deformation by middle and above earthquake force, resulting in the large transmission of seismic force to structure. Therefore, Bi-Tilt Isolator, BTI is developed to improve the defects of isolator. BTI is composed of symmetrical slope, sliding force will not occur when the interactive force is less than threshold value. To investigate the dynamic responses and influences of this proposed BTI, Arduino techniques is applied to develop a smart measuring device formeasuring acceleration responses. Then, a no-contact low-cost accuracy detecting method-dynamic digital image correlation method, DIC is proposed to detect the displacement responses and analyze influence of BTI. Mathematical models and const velocity regression method are derived to simulate the dynamic responses of this proposed BTI based on the motion stages of BTI. Then, dynamic test and numerical analysis results of BTI are compared to demonstrate the accuracy of these proposed models. Analysis results reveal that (1) this developed smart measuring device is easily to detect the acceleration responses of BTI based on Arduino techniques; (2) displacement responses also tiny displacement responses of BTI are easily identified by the Dynamic DICmethod; (3) the proposed mathematical model and constant velocity regression method can simulate accurately dynamic responses in the interface between substrate of BTI and slider with fully lubricated and mild lubrication. For those without lubrication, the analysis accuracy of error root mean square attains 0.42% and 3.10% of initial displacement for nonlinear and constant friction respectively.

    • Water cooling, PSG, PCM, Cryogenic cooling strategies and thermal analysis (experimental and analytical) of a Permanent Magnet Synchronous Motor: a review

      More Details Abstract Fulltext PDF

      The analysis of the Permanent Magnet Synchronous Machine, especially with the high power density and more efficient cooling system is of great practical significance to lower greenhouse gas, to lessen climate change. This paper gives a detailed review of advanced cooling methods and applications to thepermanent magnet synchronous motors, as well as presents experimental and analytical analyses of the cooling methods and design problems for permanent magnet synchronous motors applications. The main authors’ claimsand objectives focus on water jacket cooling methods and their requirements of efficient permanent magnet synchronous motors cooling system. Also, the water-cooling system with cryogenic, Potting silicon gelatine (PSG), and phase change materials (PCM) methods are identified investigated. First, the different heat sources are, and the various temperature effects together with their influences on the permanent magnet synchronous motors performances are studied. The main part of the work includes an evolution overview of the water-cooling methods with thermal-performance analysis. Also, the PMSM temperature control main benefits are investigated, and some unsolved problems regarding optimal motor cooling model design are commented on. Finally, recent advances in the permanent magnet synchronous motors cooling methods and future scope are presented.

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