Explicit Nonlinear Finite Element Geometric Analysis of Parabolic Leaf Springs under Various Loads

Abstract

This study describes the effects of bounce, brake, and roll behavior of a bus toward its leaf spring suspension systems. Parabolic leaf springs are designed based on vertical deflection and stress; however, loads are practically derived from various modes especially under harsh road drives or emergency braking. Parabolic leaf springs must sustain these loads without failing to ensure bus and passenger safety. In this study, the explicit nonlinear dynamic finite element (FE) method is implemented because of the complexity of experimental testing A series of load cases; namely, vertical push, wind-up, and suspension roll are introduced for the simulations. The vertical stiffness of the parabolic leaf springs is related to the vehicle load-carrying capability, whereas the wind-up stiffness is associated with vehicle braking. The roll stiffness of the parabolic leaf springs is correlated with the vehicle roll stability. To obtain a better bus performance, two new parabolic leaf spring designs are proposed and simulated. The stress level during the loadings is observed and compared with its design limit. Results indicate that the newly designed high vertical stiffness parabolic spring provides the bus a greater roll stability and a lower stress value compared with the original design. Bus safety and stability is promoted, as well as the load carrying capability.

Parametric Analysis of Parabolic Leaf Spring for En45 /GFRP/Epoxy

“…LITERATURE REVIEW Kong et al [1] in 2013 conducted the nonlinear finite element analysis of parabolic leaf spring under the variable load condition. They designed the parabolic leaf spring under the condition of vertical deflection and stresses.Shi et al [2] in 2016 conducted the study on calculating the composite stiffness of parabolic leaf spring for vehicle rear suspension.…”

Topological and Topographical Optimization of Automotive Spring Lower Seat

“…Explicit nonlinear analysis has been widely adopted in automotive spring analysis (Kong et al 2013). Explicit nonlinear is a time-integrated dynamic scheme that shows stability of convergence during simulation.…”

Bir Askeri Hizmet Taşıtında Kullanılan Parabolik Yaprak Yayın Yay Karakteristiğinin Doğrusal Olmayan Sonlu Elemanlar Analizi Yardımıyla Belirlenmesi

“…Qin ve arkadaşları, yaptıkları çalışmada, Hotchkiss tipi sabit bir süspansiyonda kullanılan parabolik yaprak yay üzerinde oluşan gerilme ve şekil değişimini farklı yükleme koşulları için doğrusal olmayan sonlu elemanlar analizi yardımıyla incelemişler ve sayısal olarak elde ettikleri yay karakteristiğini test sonuçlarıyla karşılaştırmışlardır [3]. Kong ve arkadaşları, yayınladıkları çalışmalarında, parabolik tip bir yaprak yayın yükleme karakteristiğini, eksplisit doğrusal olmayan sonlu elemanlar yöntemiyle belirlemişlerdir [4]. Bhandarkar ve arkadaşları, arkadan motorlu bir taşıtın arka aks parabolik yaprak yayının tasarımını ve gerilme analizini sonlu elemanlar yöntemiyle gerçekleştirmişlerdir [5].…”