An Integrated Environment for Vehicle Dynamics Controls and Integration

2000 ◽  
Author(s):  
Weiwen Deng ◽  
Yong Lee ◽  
Robert Nisonger ◽  
Yuen-kwok Chin
Keyword(s):  
Visual Processing ◽  
Vehicle Dynamics ◽  
Algorithm Design ◽  
Simulation Software ◽  
Development Environment ◽  
Vehicle Simulation ◽  
On Line ◽  
Simulation Results ◽  
User Friendly ◽  
And Control

Abstract This paper provides an overview of VehSim, a PC Windows-based vehicle simulation software for vehicle dynamics, controls and integration. The function and features of VehSim are discussed in general. With its high fidelity, flexibility, portability and user-friendly interfaces, VehSim provides an integrated development environment for engineers to conduct vehicle, especially chassis/driveline modeling, simulation and control algorithm design and to build quick software prototypes to accelerate chassis/driveline controls and integration development. VehSim’s structure, which includes file system, database structure and user graphic interfaces are described. Through its modularized and hierarchical structure, VehSim features great flexibility for engineers to customize their own project needs by developing their own control algorithms or incorporating supplier provided subsystem models and control modules into vehicle dynamics. With the compatibility of VehSim to real-time environment, engineers are able to perform both quick off-line simulation and on-line in-vehicle validation for algorithm development. VehSim also provides built-in user-friendly model preprocessors and postprocessors for engineers to easily build vehicle and/or subsystem models, adjust numerical computation parameters and process the simulation results on line. A 3D solid model based motion animator is also integrated in VehSim for on-line visual processing of simulation results.

Estimating Pacejka (PAC2002) Tire Coefficients for Pneumatic Tires on Soft Soils With Application to BAJA SAE Vehicles

2019 ◽  
Author(s):  
Amanda Saunders ◽  
Darris White ◽  
Marc Compere
Keyword(s):  
Vehicle Dynamics ◽  
Integration Method ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Road Vehicles ◽  
Traction Forces ◽  
Soft Soils ◽  
Vehicle Performance ◽  
Vehicle Simulation ◽  
Stress Integration

Abstract BAJA SAE is an engineering competition that challenges teams to design single-seat all-terrain vehicles that participate in a vast number of events, predominately on soft soils. Efficient performance in the events depends on the traction forces, which are dependent on the mechanical properties of the soil. To accurately model vehicle performance for each event, a model of the tire traction performance is required, and the tire model must be incorporated with a vehicle dynamics simulation. The traction forces at the soil-tire interface can be estimated using the Bekker-Wong stress integration method. However, commercially available vehicle dynamics simulation software, with a focus on on-road vehicles, does not utilize Bekker-Wong parameters. The Pacejka Magic Tire (MT) Formula is a common method for characterizing tire behavior for on-road vehicles. The parameters for the Pacejka MT Formula are usually produced by curve fitting measured tire data. The lack of available measured off-road tire data, as well as the additional variables for off-road tire performance (e.g. soil mechanics), make it difficult for BAJA SAE teams to simulate vehicle performance using commercial vehicle simulation tools. This paper discusses the process and results for estimating traction performance using the Bekker-Wong stress integration method for soft soils and then deriving the Pacejka coefficients based on the Bekker-Wong method. The process will enable teams to use the Pacejka Magic Tire Formula coefficients for simulating vehicle performance for BAJA SAE events, such as the hill climb, (off-road) land maneuverability, tractor pull, etc.

Off-Road Vehicle Dynamics Mobility Simulation With a Compaction Based Deformable Terrain Model

2013 ◽  
Author(s):  
Justin Madsen ◽  
Andrew Seidl ◽  
Dan Negrut
Keyword(s):  
Vehicle Dynamics ◽  
Transfer Functions ◽  
Soil Mechanics ◽  
Three Dimensional ◽  
Interaction Model ◽  
Simulation Software ◽  
Repeated Loading ◽  
Model Parameters ◽  
Vehicle Simulation ◽  
Terrain Model

This paper discusses the terramechanics models developed to incorporate a physics-based, three dimensional deformable terrain database model with vehicle dynamics mobility simulation software. The vehicle model is contained in Chrono, a research-grade C++ based Application Programming Interface (API) that enables accurate multibody simulations. The terrain database is also contained in a C++ based API, and includes a general tire-terrain interaction model which is modular to allow for any tire model that supports the Standard Tire Interface (STI) to operate on the terrain. Furthermore, the ability to handle arbitrary, three dimensional traction element geometry allows for tracked vehicles (or vehicle hulls) to also interact with the deformable terrain. The governing equations of the terrain are based on a soil compaction model that includes both the propagation of subsoil stresses due to vehicular loads, and the resulting visco-elastic-plastic stress/strain on the affected soil volume. Non-flat, non-homogenous and non-uniform soil densities, rutting, repeated loading and strain hardening effects are all captured in the vehicle mobility response as a result of the general 3-D tire/terrain model developed. Pedo-transfer functions allow for the calculation of the soil mechanics model parameters from existing soil measurements. This terrain model runs at near real-time speed, due to parallel CPU and GPU implementation. Results that exercise the force models developed with the 3-D tire geometry are presented and discussed for a kinematically driven tire and a full vehicle simulation.

A New Method of Gear-Position Decision for Automatic Manual Transmission of Parallel Hybrid Electric Bus

2012 ◽  
Vol 215-216 ◽  
pp. 322-326
Author(s):  
Hong Kun Zhang ◽  
Wen Jun Li ◽  
Fu Gen Hua
Keyword(s):  
Simulation Software ◽  
Manual Transmission ◽  
Vehicle Simulation ◽  
Hybrid Electric Bus ◽  
Decision Method ◽  
Shift Schedule ◽  
Electric Bus ◽  
Parallel Hybrid ◽  
Simulation Results ◽  
Hybrid Electric

In this paper, the gear-position decision method based on 3-parameter the optimal economical shift schedule for Automatic Manual Transmission (AMT) of Parallel Hybrid Electric Bus (PHEB) is proposed. Vehicle simulation model was built by using ADVISOR simulation software. The simulation results show that 3-parameter shift schedule has improved in economical performance of PHEB compared with 2-parameter shift schedule.

Design of Cylindrical Metamaterial Invisible Cloak with Non-Singular Electromagnetic Tensors

2014 ◽  
Vol 1082 ◽  
pp. 10-13
Author(s):  
Ye Liu ◽  
Zhu Ying Li ◽  
Xiang Yu ◽  
Wen Kang Cao
Keyword(s):  
Finite Element ◽  
Engineering Application ◽  
Simulation Software ◽  
Incoming Wave ◽  
Invisible Cloak ◽  
On Line ◽  
Simulation Results ◽  
Solution Region ◽  
Electromagnetic Perturbation ◽  
Bending Wave

Based on line transformation, cylindrical metamaterial invisible cloak with non-singular electromagnetic tensors is designed. The results of simulation software based on finite element methods (FEM) show that the singularity in the electromagnetic tensors of the cloak has been eliminated, comparing with the cylindrical cloak with ideal tensors. From the simulation results, although there is electromagnetic perturbation in the free-space of the solution region, this cloak exhibits nice electromagnetic invisible performance. The bending wave front is clearly seen when the incoming wave transmits into the cloak region. Because of the non-singular electromagnetic tensors, the designed cloak may have more engineering application than the cloak with idea tensors.

Real-Time Vehicle Dynamics Parameter Estimation

2005 ◽  
Author(s):  
Kwang-Keun Shin
Keyword(s):  
Parameter Estimation ◽  
Control Systems ◽  
Real Time ◽  
Vehicle Dynamics ◽  
Estimation Method ◽  
Vehicle Control ◽  
Simulation Software ◽  
Tire Pressure ◽  
Vehicle Simulation ◽  
The Stability

Vehicle dynamics parameters such as understeer coefficient are very important factors to determine the stability and dynamic handling behavior of a vehicle. These parameters vary during the lifetime of a vehicle according to different loading, tire pressure/wear or vehicle-to-vehicle variations of suspension characteristics, etc. The parameter deviations from nominal values may cause performance degradation of chassis/vehicle control systems, which is often designed based on the nominal values. Therefore, if the vehicle dynamics parameters can be estimated and monitored in real-time, the performance of chassis/vehicle control systems could be further enhanced. This paper presents a real-time vehicle dynamics parameter estimation method that estimates vehicle understeer coefficient and front/rear cornering compliances. The algorithm is implemented using Simulink, and analyzed, and validated using VehSim, which is a PC windows-based vehicle simulation software for vehicle dynamics controls and integration. The simulation results show that the developed algorithm is well capable of estimating vehicle dynamics parameters of VehSim, and, therefore, is highly feasible for in-vehicle applications.

scholarly journals Vehicle Dynamic Simulation Possibilities Using AVL Cruise M

2020 ◽  
Vol 5 (2) ◽  
pp. 309-323
Author(s):  
Dániel Nemes ◽  
Tibor Pálfi ◽  
Sándor Hajdu
Keyword(s):  
Dynamic Simulation ◽  
User Interfaces ◽  
Vehicle Dynamics ◽  
Simulation Software ◽  
Vehicle Dynamic ◽  
Vehicle Simulation ◽  
Speed Up ◽  
Vehicle Dynamic Simulation ◽  
Dynamics Simulations ◽  
Avl Cruise

In most cases, when creating vehicle dynamics simulations, we need software that can speed up model creation and simulation. There are many programs on the market for this purpose, but they have different knowledge and user interfaces. We present in this article briefly introduces the use of one of the market's leading vehicle simulation software, the AVL Cruise M.

scholarly journals The PLC Learner

2019 ◽  
Author(s):  
Sandip Boral
Keyword(s):  
Linear Programming ◽  
Flash Memory ◽  
Engineering Students ◽  
Great Depth ◽  
Simulation Software ◽  
Programmable Logic ◽  
Development Environment ◽  
Integrated Development ◽  
Different Types ◽  
User Friendly

The goal of this project is to promote the interest of Engineering Students and the Technical Personnels in the field of Industrial Automation with use of Programmable Logic Controller in a broad range. The objective is not great depth but the presentation is thorough enough to give the user the basic theory with different types of live examples. ‘PLC Learner’ is a Simulation Software, which supports the linear programming of SIEMENS PLC, STEP5 with STL representation. The simulator has an Integrated Development Environment having different features like Smart Editor, Compiler, Run Time Simulator and User Friendly Help System etc. It offers 128 bytes of Input & 128 bytes of Output modules, 128 bytes of Timers (including Pulse, Extended, On-Delay, Stored On-Delay and Off Delay mode), 128 bytes of Counters (including Up, Down and Up-Down mode) and 256 bytes of Internal Flash Memory.

Adaptive Signal Analysis and Interpretation for Real-time Intelligent Patient Monitoring

1994 ◽  
Vol 33 (01) ◽  
pp. 60-63 ◽  
Author(s):  
E. J. Manders ◽  
D. P. Lindstrom ◽  
B. M. Dawant
Keyword(s):  
Computer Architecture ◽  
Real Time ◽  
Data Abstraction ◽  
Monitoring Strategy ◽  
Intelligent Monitoring ◽  
Patient Status ◽  
On Line ◽  
Main Components ◽  
And Control ◽  
Adaptive Signal

Abstract:On-line intelligent monitoring, diagnosis, and control of dynamic systems such as patients in intensive care units necessitates the context-dependent acquisition, processing, analysis, and interpretation of large amounts of possibly noisy and incomplete data. The dynamic nature of the process also requires a continuous evaluation and adaptation of the monitoring strategy to respond to changes both in the monitored patient and in the monitoring equipment. Moreover, real-time constraints may imply data losses, the importance of which has to be minimized. This paper presents a computer architecture designed to accomplish these tasks. Its main components are a model and a data abstraction module. The model provides the system with a monitoring context related to the patient status. The data abstraction module relies on that information to adapt the monitoring strategy and provide the model with the necessary information. This paper focuses on the data abstraction module and its interaction with the model.

Development of a Jacobian Module for Advanced Pulp and Paper Simulation and Control

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 4-11
Author(s):  
MOHAMED CHBEL ◽  
LUC LAPERRIÈRE
Keyword(s):  
Control System ◽  
Nonlinear Behavior ◽  
Simulation Software ◽  
Pulp And Paper ◽  
Pid Controllers ◽  
Tuning Parameters ◽  
Pid Tuning ◽  
Fixed Set ◽  
And Control ◽  
Operating Points

Pulp and paper processes frequently present nonlinear behavior, which means that process dynam-ics change with the operating points. These nonlinearities can challenge process control. PID controllers are the most popular controllers because they are simple and robust. However, a fixed set of PID tuning parameters is gen-erally not sufficient to optimize control of the process. Problems related to nonlinearities such as sluggish or oscilla-tory response can arise in different operating regions. Gain scheduling is a potential solution. In processes with mul-tiple control objectives, the control strategy must further evaluate loop interactions to decide on the pairing of manipulated and controlled variables that minimize the effect of such interactions and hence, optimize controller’s performance and stability. Using the CADSIM Plus™ commercial simulation software, we developed a Jacobian sim-ulation module that enables automatic bumps on the manipulated variables to calculate process gains at different operating points. These gains can be used in controller tuning. The module also enables the control system designer to evaluate loop interactions in a multivariable control system by calculating the Relative Gain Array (RGA) matrix, of which the Jacobian is an essential part.

A Modified Dugoff Tire Model for Combined-slip Forces

2010 ◽  
Vol 38 (3) ◽  
pp. 228-244 ◽  
Author(s):  
Nenggen Ding ◽  
Saied Taheri
Keyword(s):  
Vehicle Dynamics ◽  
Tire Model ◽  
Magic Formula ◽  
Model Based ◽  
Proposed Model ◽  
Road Friction ◽  
On Line ◽  
Double Lane Change ◽  
Tire Forces ◽  
Tire Models

Abstract Easy-to-use tire models for vehicle dynamics have been persistently studied for such applications as control design and model-based on-line estimation. This paper proposes a modified combined-slip tire model based on Dugoff tire. The proposed model takes emphasis on less time consumption for calculation and uses a minimum set of parameters to express tire forces. Modification of Dugoff tire model is made on two aspects: one is taking different tire/road friction coefficients for different magnitudes of slip and the other is employing the concept of friction ellipse. The proposed model is evaluated by comparison with the LuGre tire model. Although there are some discrepancies between the two models, the proposed combined-slip model is generally acceptable due to its simplicity and easiness to use. Extracting parameters from the coefficients of a Magic Formula tire model based on measured tire data, the proposed model is further evaluated by conducting a double lane change maneuver, and simulation results show that the trajectory using the proposed tire model is closer to that using the Magic Formula tire model than Dugoff tire model.

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