Predictive Analysis for Engine/Driveline Torsional Vibration in Vehicle Conditions using Large Scale Multi Body Model

2003 ◽  
Author(s):  
B. Vandenplas ◽  
K. Gotoh ◽  
S. Dutre
Keyword(s):  
Torsional Vibration ◽  
Large Scale ◽  
Predictive Analysis ◽  
Body Model ◽  
Multi Body

Analysis of Torsional Vibration of Large-Scale Ship Propulsion Shafting

2015 ◽  
Author(s):  
Weizhong Tan ◽  
Cong Zhang ◽  
Zhe Tian ◽  
Xinping Yan
Keyword(s):  
Torsional Vibration ◽  
Large Scale ◽  
Ship Hull ◽  
Dynamic Coupling ◽  
The Real ◽  
Ship Propulsion ◽  
Torsion Vibration ◽  
Simulation Results ◽  
Multi Body ◽  
Body Dynamic

This paper is based on the multi-body dynamic coupling theory and finite element theory. A multi-body dynamic coupling model of the large-scale vessel is built and the torsion vibration characteristics of slow-speed ship propulsion shafting are analyzed. The measurements of shafting torsional vibration in the real ship are compared with the results from the simulation model. Then, the differences between measurements and simulation results are analyzed in multi-orders. The analysis result indicates that the simulation results are almost the same with measurements obtained from the real ship, which verify the correctness and feasibility of the model. At the same time, the influence of ship hull deformation on the torsion vibration of ship propulsion shafting is discussed by Adams/Vibration. The analysis shows that the ship hull deformation could cause the significant increase of torsional vibration of ship propulsion shafting.

3D Printing Complex Structures Using Modeling and Simulation

2015 ◽  
Author(s):  
Hammad Mazhar
Keyword(s):  
3D Printing ◽  
Open Source ◽  
Data Structures ◽  
Large Scale ◽  
Selective Layer ◽  
Parallel Data ◽  
Wide Range ◽  
Data Structures And Algorithms ◽  
Multi Body ◽  
Dynamics Problems

This paper describes an open source parallel simulation framework capable of simulating large-scale granular and multi-body dynamics problems. This framework, called Chrono::Parallel, builds upon the modeling capabilities of Chrono::Engine, another open source simulation package, and leverages parallel data structures to enable scalable simulation of large problems. Chrono::Parallel is somewhat unique in that it was designed from the ground up to leverage parallel data structures and algorithms so that it scales across a wide range of computer architectures and yet has a rich modeling capability for simulating many different types of problems. The modeling capabilities of Chrono::Parallel will be demonstrated in the context of additive manufacturing and 3D printing by modeling the Selective Layer Sintering layering process and simulating large complex interlocking structures which require compression and folding to fit into a 3D printer’s build volume.

Control of Large-Scale Impacts by Designed Structural Damping

2005 ◽  
Author(s):  
Jan Wigaard ◽  
Christopher Hoen ◽  
Sverre Haver
Keyword(s):  
Impact Energy ◽  
Large Scale ◽  
Permanent Deformation ◽  
Energy Levels ◽  
Attractive Alternative ◽  
Safety Level ◽  
Shock Absorbers ◽  
Impact Forces ◽  
Multi Body ◽  
The Impact

Modification of deep-water floaters often involves module installation using a floating crane vessel. The impact forces caused by relative motions between the floating vessels represent a major challenge during set down on the floater deck due to the large inherent variability of these forces. Traditionally the difficulties in predicting impact forces during module installation have been overcome by the use of experienced based rules of thumb rather than accurate simulations and calculations. One has to some degree relied on the indeed present but un-quantifiable effect of human intelligence of the operation supervisor. Traditionally the impact forces are taken either by elastic deformation of the module itself and/or the installation guides or by permanent deformation of intermediate structural elements through e.g. plastic yielding of ductile metal members or crushing of wood members. Designing the module and the guides to be able to take the entire probable range of impact forces is difficult due to the inherent contradiction between wanted flexibility and required strength. The large uncertainties of the impact energy imply that it is difficult to design these intermediate elements to cover all possible impact energy levels. Furthermore, these elements cannot be applied in cases where repeated impacts may occur. An attractive alternative to the traditional solutions is application of industrial shock absorbers. The performance of these is predictable and they can be designed to cover the estimated range of impact energy. This paper will present a more precise and consistent design and analyses methodology that gives a more accurate measure on the reliability of the operation in accordance with code requirements. The paper will show application of industrial shock absorbers as an alternative to traditional solutions for impact handling during offshore module installation to floating vessels, illustrated with experience gained by the installation of two modules on the Visund Semi. Results from multi-body simulations and model tests comparing traditional methods with the proposed solution will be given. The significant benefits obtained with respect to increased operational performance, reduced acceleration loads on the installed equipment, the increased predictability of the operation, and the consistent safety level in accordance with code requirements, will be highlighted. The possibility to apply designed damping for other offshore applications like dropped object protection etc, is also discussed.

Hydraulic actuation of multi-body structures through large-scale motions. Part 2: Controller design and performance

2008 ◽  
Vol 222 (3) ◽  
pp. 365-375
Author(s):  
D T Branson ◽  
P S Keogh ◽  
D G Tilley
Keyword(s):  
Hydraulic System ◽  
Large Scale ◽  
Controller Design ◽  
Experimental Tests ◽  
Companion Paper ◽  
Design Stage ◽  
Base Level ◽  
Active Vibration ◽  
And Performance ◽  
Multi Body

This paper addresses a controller design methodology for the hydraulic actuation of non-linear multi-body systems. It takes account of system uncertainties, envisaged system changes through added mass, positioning speed requirements, and vibration control. A mathematical model developed in the companion paper, Part 1, describes an experimental multi-body structure that is actuated by a hydraulic system. It is used to generate H∞-based position and active vibration controllers to meet the actuation requirements at the design stage. Experimental tests were undertaken with the developed H∞ controllers to demonstrate their accuracy and stability of motion control. The results are compared to ‘base level’ tests completed using a more traditional proportional-integral (PI) controller. In contrast with the instability experienced using PI control, the design process associated with the H∞ controllers ensures accurate closed loop stability over the range of system variations.

Sign in / Sign up

Export Citation Format

Share Document