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 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.

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.

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.

A Calculation Method of Velocity and Acceleration of Wheel Center Based on Rigid Multi-Body System Dynamics

2011 ◽  
Vol 121-126 ◽  
pp. 4922-4925
Author(s):  
Shu Hua Liao ◽  
Cai Hong Yang
Keyword(s):  
Calculation Method ◽  
Theoretical Basis ◽  
High Accuracy ◽  
Rigid Body Dynamics ◽  
Dynamic Equations ◽  
Body System ◽  
Dynamics Model ◽  
Adams Software ◽  
Body Dynamics ◽  
Multi Body

On the basis of calculation of velocity and acceleration in multi-rigid body dynamics,velocity and acceleration formulas of wheel center are established when dynamic equations of vehicle are built. Adams software is used to test correction of the method ,demonstrating high accuracy of the way， which provide theoretical basis for dynamics model of vehicle.

Kinematics and Dynamics Simulation Research for Roller Coaster Multi-Body System

2011 ◽  
Vol 421 ◽  
pp. 276-280 ◽  
Author(s):  
Ge Ning Xu ◽  
Hu Jun Xin ◽  
Feng Yi Lu ◽  
Ming Liang Yang
Keyword(s):  
Structural Design ◽  
3D Model ◽  
Structure Design ◽  
Dynamics Simulation ◽  
Body System ◽  
Load Spectrum ◽  
Roller Coaster ◽  
Simulation Research ◽  
Calculation Results ◽  
Multi Body

To assess the roller coaster multi-body system security, it is need to extract the running process of kinematics, dynamics, load spectrum and other features, as basis dates of the roller coaster structural design. Based on Solidworks/motion software and in the 3D model, the calculation formula of the carrying car velocity and acceleration is derived, and the five risk points of the roller coaster track section are found by simulation in the running, and the simulation results of roller coaster axle mass center velocity are compared with theoretical calculation results, which error is less than 4.1%, indicating that the calculation and simulation have a good fit and providing the evidence for the roller coaster structure design analysis.

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.

Systems dynamics model of a transition firm

2005 ◽  
Vol 31 (3) ◽  
pp. 67-80
Author(s):  
David L. Olson ◽  
Paraskeva Dimitrova‐Davidova ◽  
Ivan Stoykov
Keyword(s):  
System Dynamics ◽  
Multiple Criteria ◽  
Dynamics Simulation ◽  
Economic Systems ◽  
Eastern European ◽  
Dynamics Modeling ◽  
Dynamics Model ◽  
Pedagogical Tool ◽  
Modeling Process ◽  
Eastern European Countries

Eastern European countries are undergoing a transition from centralized economic planning to more open economic systems. A team of Bulgarian and U.S. researchers have collaborated to study this problem, using a real Bulgarian winery as the focus of their research. System dynamics modeling was selected as a tool to provide better understanding of management issues. A framework for future objective research, and as a pedagogical tool. This system dynamics model generates output on a number of measures. This paper presents initial output from the model, reporting profit ability, risk, and market share measures. These multiple measures create the need for multiple criteria analysis. Three multiple criteria techniques are demonstrated, and their value in the system dynamics simulation modeling process is discussed.

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