scholarly journals Numerical simulation of a sinking ship scenario based on archaeological records

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Smiljko Rudan ◽  
Irena Radić Rossi
Keyword(s):  
Numerical Simulation ◽  
System Dynamics ◽  
Archaeological Site ◽  
3D Modelling ◽  
Body System ◽  
Standard Practice ◽  
The Past ◽  
Modern Engineering ◽  
The Creation ◽  
Multi Body

Over the past decade, photogrammetric recording and virtual 3D modelling have evolved as a standard practice in documenting shipwreck sites. Exploiting the same methods, we can attempt to virtually reconstruct the dynamics of an accident leading to the creation of an archaeological site. By applying modern engineering tools capable of deploying multi-body system dynamics to simulate the damaging, capsizing and/or sinking of a ship, we can model and analyse the various possible scenarios of an incident occurring to an ancient merchantman. Subsequently, we can establish the correlation between the characteristics of the actual shipwreck site, and the outcome of the numerical simulation of the assumed scenario.

With the Backlash Dynamics Simulation of a Crank-Slider Mechanism of the Internal Combustion Engine

2012 ◽  
Vol 215-216 ◽  
pp. 1081-1084
Author(s):  
Shao Jun Bo ◽  
Kui Ji ◽  
Juan Tian
Keyword(s):  
System Dynamics ◽  
Combustion Engine ◽  
Dynamics Simulation ◽  
Kinematic Pair ◽  
Body System ◽  
Nonlinear Characteristics ◽  
Preliminary Study ◽  
Multi Body ◽  
Dynamics Models ◽  
Crank Mechanism

On the basis of flexible multi-body system dynamics theory, we built flexible multi-body system dynamics models which include a backlash, and to a slider-crank mechanism as the research object, we made a preliminary study on the effect on the flexible components and the backlash of the kinematic pair on mechanical system dynamics characteristics. To consider the backlash of the kinematic pair and component of flexible space can show a preliminary research on the dynamic simulation, and focus on the backlash, friction and gravity field to influence in the dynamic characteristics of the system. The simulation results show that, due to the existence of backlash made the two components frequent collision in the process of the stretching, clearance, flexible and friction are closed, make the system nonlinear characteristics increased.

Research on Parallel Computation Architecture Based on Object Computing Network

2011 ◽  
Vol 317-319 ◽  
pp. 374-385
Author(s):  
Zhen Nan Cao ◽  
Bo Shen
Keyword(s):  
System Dynamics ◽  
Programming Language ◽  
Programming Model ◽  
System Modeling ◽  
Space Time ◽  
Model Complexity ◽  
Discretization Method ◽  
Body System ◽  
Euler Formula ◽  
Multi Body

In this paper, a multi-body system dynamics problem is considered as a complex system modeling and computation problem. A parallel programming model and its execution environment are designed to reduce model complexity and to improve computational speed. In this architecture, the problem is divided into two levels: 1. Find a parallel mathematical algorithm to describe the behavior of this multi-body system. 2. Build a unified programming language that could leverage many different pieces of computational resources, such as symbolic computing, and numerical libraries. To tackle the first level, Space-Time Finite Element Method (FEM) is applied. The Space-Time FEM formats of Newton-Euler formula is given, as well as its constraint formula. This algorithm has avoided the loop operation during the time field solving. To tackle the second level, a network-based functional programming language - Object Computing Network (OCN) is designed. OCN is inspired by Object-Process Methodology (OPM). In OCN, every computation behavior is treated as a function, which is constructed by a three element set: {Var, Rule. Condition}. Three basic patterns - Branching, Synchronizing, Merging are given in OCN to prove the flexibility of OCN. An communication interface is designed in OCN to connect different programming languages together. Two multi-body system dynamics computing models - Semi-discretization method and Space-Time discretization method - are constructed with OCN, and a significant contrast in task parallelization is shown by different OCN models.

Optimum Design of Local Cam Profile of a Valve Train

2010 ◽  
Vol 224 (11) ◽  
pp. 2487-2492 ◽  
Author(s):  
W J Qin ◽  
J Q He
Keyword(s):  
System Dynamics ◽  
Valve Train ◽  
Dynamic Responses ◽  
Dynamics Simulation ◽  
Body System ◽  
Dynamics Model ◽  
Adams Software ◽  
Cam Profile ◽  
Multi Body ◽  
The Relationship

In this paper, optimization of the local cam profile of a valve train modelled by a parameterized Bezier curve is described. Dynamic responses of the valve train are simulated through its multi-body system dynamics model built using ADAMS software. The kriging method is used to build the surrogate model, which presents the relationship between dynamic responses resulting from the multi-body system dynamics simulation and the parameters of the local Bezier profile. The local cam profile is optimized through a generic algorithm, such that the acceleration peak at the valve open phase is reduced significantly.

With the Backlash Dynamics Simulation of a Crank-Slider Mechanism

2012 ◽  
Vol 479-481 ◽  
pp. 707-710
Author(s):  
Shao Jun Bo ◽  
Kui Ji
Keyword(s):  
System Dynamics ◽  
Dynamics Simulation ◽  
Kinematic Pair ◽  
Body System ◽  
Nonlinear Characteristics ◽  
Preliminary Study ◽  
Simulation Results ◽  
Multi Body ◽  
Dynamics Models ◽  
Crank Mechanism

On the basis of flexible multi-body system dynamics theory, we built flexible multi-body system dynamics models which include a backlash, and to a slider-crank mechanism as the research object, we made a preliminary study on the effect on the flexible components and the backlash of the kinematic pair on mechanical system dynamics characteristics. To consider the backlash of the kinematic pair and component of flexible space can show a preliminary research on the dynamic simulation, and focus on the backlash, friction and gravity field to influence in the dynamic characteristics of the system. The simulation results show that, due to the existence of backlash made the two components frequent collision in the process of the stretching, clearance, flexible and friction are closed, make the system nonlinear characteristics increased.

A superelement model for analysis of multi-body system dynamics

1989 ◽  
Vol 32 (5) ◽  
pp. 1085-1091 ◽  
Author(s):  
O.P. Agrawal ◽  
R. Kumar
Keyword(s):  
System Dynamics ◽  
Body System ◽  
Multi Body

Initiation life prediction of TBM cutterhead based on multi-body system dynamics

2016 ◽  
Author(s):  
Nan Hou ◽  
Kui Chen ◽  
Dong Zhu ◽  
Jing-Xiu Ling ◽  
Jian-Jun Zhou ◽  
...  
Keyword(s):  
System Dynamics ◽  
Life Prediction ◽  
Body System ◽  
Multi Body

scholarly journals Study of the Vehicle Controllability and Stability Based on Multi-body System Dynamics

2014 ◽  
Vol 8 (1) ◽  
pp. 865-871 ◽  
Author(s):  
Lin Hu ◽  
Shengyong Fang ◽  
Jia Yang
Keyword(s):  
System Dynamics ◽  
Multibody System ◽  
Steering Wheel ◽  
Body System ◽  
System Dynamics Model ◽  
Dynamics Model ◽  
Pulse Input ◽  
Torsion Stiffness ◽  
Input Response ◽  
Multi Body

In this paper, the 135 Degree of Freedom multi-body system dynamics model was built by using the software ADAMS/CAR, according to the requests of Chinese standards, and the simulating research about 6 performances of automotive controllability and stability were carried on. Based on the simulating results, some automobile’s performance, such as return-ability, slalom-ability and steering efforts-ability, were excellent, but some other performances, such as steady state cornering ability, steering wheel angle pulse input response ability and steering wheel angle step input response ability, were not satisfied. In order to improve the performance of the automobile, three parameters, i.e. the automotive mass, the load of front axis and the torsion stiffness of rear stabilizer anti-roll bar, were selected as the optimized objects. Within the variety range of the parameters, the multi-body system of the automobile was optimized. Automotive controllability and stability is improved obviously based on the simulating results of the optimized multibody system.

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