Prediction of Sealing Performance of V-Coupling of Turbocharger Housing Using Analytical and Finite Element Analysis
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ght © 2020 KSAE/ 11824 pISSN 12299138/ eISSN 19763832
PREDICTION OF SEALING PERFORMANCE OF V-COUPLING OF TURBOCHARGER HOUSING USING ANALYTICAL AND FINITE ELEMENT ANALYSIS Bok-Lok Choi1), Seong-Ki Hong2) and Byoung-Ho Choi3)* School of Mechanical and Automotive Engineering, Gangneung-Wonju National University, Wonju-si 26403, Korea 2) Technical Research Team, R&D Center, Keyyang Precision Co., 63, Gongdan 4-gil, Gimcheon-si, Gyeongsangbuk-do 39537, Korea 3) School of Mechanical Engineering, Korea University, Seoul 02841, Korea 1)
(Received 30 September 2019; Revised 20 January 2020; Accepted 20 February 2020) ABSTRACTThis study uses analytical and finite element methods to predict the sealing performance by calculating the contact pressures on the back plate of a turbocharger. A mathematical model is constructed to derive the contact force on the back plate by considering the force-transfer mechanisms. Finite element analyses are performed to calculate the contact pressures caused by applying the bolt preload in the coupling system. The analytical results are consistent with those of the finite element analysis; hence, the analytical model could be helpful in determining the effects of design parameters in the early design stage of the coupling. In addition, the pressure distributions on the back plate are predicted to identify the sealing performance of the coupling. KEY WORDS : Turbocharger, V-coupling, Contact pressure, Sealing performance, Finite element analysis
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effective way to reduce fuel consumption. However, although the use of the turbocharger has become widespread, its performance over the entire operating range of the engine is not well-known yet. For example, the consequences of turbocharging on engine operation are not clearly understood (Deligant et al., 2012, Pesiridis, 2012). A coupling in a turbocharger is generally used as a mechanical fastener to compress the turbine housing and bearing housing. The back plate is located between housings and is compressed by the bolt clamping force to prevent gas leakage during turbocharger operation (Choi, 2013, Mountford, 1980). In general, band-type couplings are effectively applied in a wide range of machinery parts, e.g., engines, turbochargers, and pipes. Unlike typical band-type couplings, a V-coupling is a component used in the turbocharger when a high tightening torque is required. Several studies have been published on different types of couplings (Hudson, 1977; Barrans and Muller, 2009; Lee et al., 2016). Classical and finite element analyses that investigated the stresses generated in the Vband during the assembly process have been presented (Shoghi et al., 2003, 2004, 2006). A finite element analysis of cylindrical shells with end flanges has also been conducted (Qin et al., 2012, 2013). The authors of these studies discussed the axial load capability, axial stiffness, and damping characteristics of the clamp-band joint for and axial load with the preload. Furthermore, the mechanical-
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