Abstract
The influences of transmission housing elastic deformations on the vibration gear shafting characteristics are studied. The vibration model of the vehicle transmission system in consideration of the dynamics coupling of the housing and the gear shafting is constructed. Aiming at a vehicle transmission, the mathematical model of the bending and torsional gear shafting vibrations is established based on the lumped mass method. Following the elastic treatment of the box, a comprehensive stiffness model at the bearing considering the housing deformation is proposed to achieve the dynamic coupling between the box and the gear shafting system. Furthermore, the gear shafting vibration characteristics considering housing deformations are obtained by integrating multisource dynamic excitation, which is solved using an iterative method. The results are verified through a bench test. And, it shows that the elastic deformation of the housing aggravates the gear shafting vibration (bending and torsional coupled vibration). The peak frequency mostly remains the same. The maximum speed changes amplitude and associated root mean square value (calculated at the gear position) increase by 55.5% and 59.6%, respectively. Next, the maximum bearing support force and its root mean square value are increased by 63.7% and 97.6%, respectively. Finally, the largest increase in maximum vibration acceleration at the measuring point and the simulated root mean square value are 90% and 63.1%, respectively. It is concluded that the research results provide a theoretical basis for the study of transmission dynamic reliability.
Highlights
Gear transmission displays complex dynamics behaviors, which are the result of both internal and external multisource excitations. e dynamic gear shafting excitation deforms the thin-walled housing, and the elastic deformation is fed back to the gear shafting through bearings
It affects the bending and torsional vibration characteristics of the gear shafting, reducing the vehicle NVH performance, causing resonance, and reducing the personal safety of the passengers. us, it is important for transmission system dynamics to establish the coupling vibration model of gearbox housing and gear shafting, which will enable analyzing the influence of elastic gearbox deformation on the dynamics characteristics of gear shifting
Finite element modeling [1,2,3,4] and multibody dynamics simulations [5,6,7,8,9] were predominantly used in studies on transmission system dynamics. e former, finite element method, with high accuracy was used to observe various complex shapes [10,11,12,13,14] and simulate the quasistatic contact force in the system
Summary
Gear transmission displays complex dynamics behaviors, which are the result of both internal and external multisource excitations. e dynamic gear shafting excitation deforms the thin-walled housing, and the elastic deformation is fed back to the gear shafting through bearings. Us, it is important for transmission system dynamics to establish the coupling vibration model of gearbox housing and gear shafting, which will enable analyzing the influence of elastic gearbox deformation on the dynamics characteristics of gear shifting. There were few studies on the influence of elastic gearbox housing deformation on gear shafting vibrations. A vehicle transmission is viewed as the research object, and the comprehensive stiffness model of bearings is established considering the housing elasticity at the coupling part between the housing and the shafting. The dynamics coupling model of the transmission housing and gear shafting is established and solved via the Simulink and ADAMS cosimulation method. E model is verified using a bench test, and the profound influences of housing elastic deformations on the gear shafting dynamic characteristics are analyzed The dynamics coupling model of the transmission housing and gear shafting is established and solved via the Simulink and ADAMS cosimulation method. e model is verified using a bench test, and the profound influences of housing elastic deformations on the gear shafting dynamic characteristics are analyzed
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