Dynamic Stress Analysis of a Vehicle Frame by Flexible Multibody Dynamics Simulation

2001 ◽  
Author(s):  
Kwon-Hee Suh ◽  
Yoon-Ki Lee ◽  
Hi-Seak Yoon
Keyword(s):  
Stress Analysis ◽  
Multibody Dynamics ◽  
Dynamic Stress ◽  
Flexible Multibody Dynamics ◽  
Dynamics Simulation ◽  
Flexible Multibody ◽  
Dynamic Stress Analysis

Dynamics Simulation and Crankshaft Dynamic Stress Analysis of 6L21/31 Marine Medium-Speed Diesel Engine

2012 ◽  
Vol 271-272 ◽  
pp. 732-736
Author(s):  
Min Xiao ◽  
Wan Qiang Shi
Keyword(s):  
Diesel Engine ◽  
Stress Analysis ◽  
Dynamic Stress ◽  
Virtual Prototyping ◽  
Dynamics Simulation ◽  
Characteristic Analysis ◽  
Medium Speed ◽  
Rigid Model ◽  
Virtual Prototyping Technology ◽  
Dynamic Stress Analysis

In order to solve the problem of some cracks appearing in certain parts of the crankshaft for 6L21/31 diesel engine, the completed multi-rigid body virtual prototyping (VP) model of the diesel engine was established on the basis of the virtual prototyping technology, and the dynamics characteristic analysis was finished. Then, based on the completed flexible-rigid model of 6L21/31 diesel engine, the dynamic stress analysis of the crankshaft was accomplished, and the maximum stress value and its location were got. The results provided the basis for the improvement and optimization of the crankshaft.

scholarly journals Iterative Coordinate Reduction Algorithm of Flexible Multibody Dynamics Using a Posteriori Eigenvalue Error Estimation

2020 ◽  
Vol 10 (20) ◽  
pp. 7143
Author(s):  
Seongji Han ◽  
Jin-Gyun Kim ◽  
Juhwan Choi ◽  
Jin Hwan Choi
Keyword(s):  
Multibody Dynamics ◽  
Reduction Process ◽  
Flexible Multibody Dynamics ◽  
Dynamics Simulation ◽  
Iteration Step ◽  
Error Estimator ◽  
A Posteriori ◽  
Flexible Bodies ◽  
Flexible Multibody ◽  
Coordinate Reduction

Coordinate reduction has been widely used for efficient simulation of flexible multibody dynamics. To achieve the reduction of flexible bodies with reasonable accuracy, the appropriate number of dominant modes used for the reduction process must be selected. To handle this issue, an iterative coordinate reduction strategy is introduced. In the iteration step, more dominant modes of flexible bodies are selected than the ones in the previous step. Among the various methods, the conventional frequency cut-off rule is here considered. As a stop criterion, a novel a posteriori error estimator that can evaluate the relative eigenvalue error between full and reduced flexible bodies is proposed. Through the estimated relative eigenvalue error obtained, the number of dominant modes is automatically selected to satisfy the error tolerance up to the desired mode range. The applicability to the automation process is verified through numerical examples. It is also evaluated that efficient and accurate flexible multibody dynamics simulation is available with the reduced flexible body, generated by the proposed algorithm.

Nonlinear Flexible Multibody Dynamics Simulation of Operating Shock Response and Head Lift-Off in Hard Disk Drives

2009 ◽  
Author(s):  
Takehiko Eguchi ◽  
Noritaka Otake ◽  
Keiko Watanabe
Keyword(s):  
Multibody Dynamics ◽  
Hard Disk Drives ◽  
Flexible Multibody Dynamics ◽  
Base Plate ◽  
Hard Disk ◽  
Dynamics Simulation ◽  
Disk Drives ◽  
Shock Response ◽  
Flexible Multibody ◽  
Lift Off

This paper describes a method of simulating the operational shock (op-shock) response of hard disk drives (HDDs) and its application to improving the op-shock robustness of HDDs. This flexible multibody dynamics simulation model is based on component-mode synthesis of three components; a rotating part including rotating disks and the hub/shaft of the spindle motor, a stationary part including base plate, top cover, and other major stationary parts, and an actuator part representing the moving parts of the head actuator mounted on head sliders. These components are connected to each other by fluid dynamic bearings, pivot bearings, and air bearings, and their nonlinear characteristics are considered in the op-shock response simulation. Linear and nonlinear drive-level simulation models were built, and their accuracies were experimentally verified in terms of their predicted linear frequency response, nonlinear time historical response, and head lift-off boundary. Moreover, a parametric study was performed to improve the op-shock robustness of a 2.5-inch HDD for the head lift-off boundaries of 3920 m/s2 (400 G) and 4900 m/s2 (500 G). The study indicated that the HDD model sensitivities to changes in the stiffness of the base plate and in the thickness of the disk were substantial but they saturated as the parameters became larger. The results indicated that the head lift-off boundary of 3920 m/s2 can be reached by making small modifications to the parts design, but the 4900 m/s2 boundary can’t be reached without the whole drive system being redesigned.

Sign in / Sign up

Export Citation Format

Share Document