An Automated Design Method for Active Trailer Steering Systems of Articulated Heavy Vehicles

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Yuping He ◽  
Md. Manjurul Islam
Keyword(s):  
Design Method ◽  
Bilevel Optimization ◽  
Automated Design ◽  
Driver Model ◽  
Design Decision ◽  
Design Framework ◽  
Heavy Vehicles ◽  
Trade Off ◽  
Vehicle Simulation ◽  
Loop Design

An important design decision for active trailer steering (ATS) systems for articulated heavy vehicles (AHVs) is the trade-off between maneuverability and lateral stability. This paper presents an automated design method for this trade-off. The proposed method has the following features: (1) a design framework for bilevel optimization of ATS systems is formulated; (2) design variables of ATS controllers and trailers are optimized simultaneously; (3) two controllers are designed for the ATS system for improving stability and enhancing maneuverability, respectively; and (4) a driver model is introduced in the virtual vehicle simulation for closed-loop testing maneuvers. The design framework allows automation of vehicle modeling, controller construction, performance evaluation, and design variable selection, and all required design processes are implemented in a single loop. The proposed method is compared to a previously published two-loop design method, showing that the new approach can effectively identify desired variables and predict performance envelopes.

Automated Design Synthesis of Articulated Heavy Vehicles With Active Trailer Steering Systems

2010 ◽  
Author(s):  
Md Manjurul Islam ◽  
Yuping He ◽  
Timothy D. Webster
Keyword(s):  
Design Method ◽  
Automated Design ◽  
Driver Model ◽  
Lateral Stability ◽  
Heavy Vehicles ◽  
Design Synthesis ◽  
Vehicle Performance ◽  
High Speeds ◽  
Design Variables ◽  
Low Speeds

This paper presents an automated design synthesis approach for articulated heavy vehicles (AHVs) with active trailer steering (ATS) systems. AHVs have poor maneuverability when traveling at low speeds. Moreover, AHVs exhibit unstable motion modes at high speeds. To address the problem of maneuverability, ‘passive’ trailer steering systems have been developed. These systems improve low-speed performance, but feature with low lateral stability at high speeds. Some ATS systems have been proposed to improve highspeed lateral stability. However, these systems typically degrade maneuverability when applied at low speeds. To tackle this conflicting design problem, a systematic method is proposed for the design of AHVs with ATS systems. This new design method has the following features: the optimal active design variables of the ATS systems and the optimal passive design variables of the vehicle are identified in a single design loop; in the design process, to evaluate the vehicle performance measures, a driver model is introduced and it ‘drives’ the vehicle model based on the well-defined testing specifications. Through the design optimization of an ATS system for an AHV with a tractor and a full trailer, this single design loop (SDL) method is compared against a published two design loop (TDL) method. The benchmark investigation shows that the former can determine better trade-off design solutions than those derived by the latter. This SDL method provides an effective approach to automatically implement the design synthesis of AHVs with ATS systems.

scholarly journals Skew Superelevation Edge Rounding Design Improving Riding Comfort on Freeways

2019 ◽  
Vol 2673 (1) ◽  
pp. 343-357
Author(s):  
Konstantinos Apostoleris ◽  
Basil Psarianos ◽  
Ioannis-Alexandros Choupas ◽  
Vassilios Matragos
Keyword(s):  
Road Safety ◽  
Simulation Program ◽  
Heavy Vehicles ◽  
Parameter Change ◽  
Vehicle Simulation ◽  
Different Types ◽  
Vertical Accelerations ◽  
Design Speed ◽  
High Level ◽  
Traveling Speed

Skew superelevation has proven to be an efficient pavement constructional measure to address hydroplaning phenomena under specific critical superelevation runoff designs. However, this technique has raised concerns about user’s comfort when driving over the skewed edge of the pavement, especially for heavy vehicles and when the traveling speed is higher than the design speed. This paper aims to evaluate the driving comfort outcome on an improved skew superelevation design, where a rounding of the skew edge has been applied. This is achieved through the use of a simulation program which examines the vehicle and driver behavior when passing over it. The simulation program estimates many parameters including the lateral and vertical accelerations ( Gy and Gz) imposed on both elements, the vehicle and the driver. This evaluation is made for different alignment designs provided in the freeway design and for a broad range of especially high velocities ranging from 80 to 160 km/h (50–100 mph), as well as for different types of heavy vehicles. Also, the influence on the above parameters has been investigated in respect of the distance between two consecutive skew superelevations, concerning cases of entering and exiting a simple, low-length curve. The outcomes are classified in order to evaluate their variability as affected by each parameter change (speed, geometry, vehicle). Simulation results are compared with thresholds, as provided in the international literature, to ensure driver comfort and a high level of road safety.

Design and Implementation of Point Symbol Database Based on ArcGIS Engine

2012 ◽  
Vol 263-266 ◽  
pp. 1853-1857
Author(s):  
Mao Lin Wang ◽  
Ai Jun Xu
Keyword(s):  
Design Process ◽  
Design Method ◽  
Word Type ◽  
Design Framework ◽  
Design And Development ◽  
Design And Implementation ◽  
Arcgis Engine ◽  
Point Symbol

In this article, geometric primitive approach is used to realize the design and development of point symbol database for mapping based on C# .NET and ArcGIS Engine. This paper presents the design framework and the design process of point symbol database, and studies design method and attribute management of point symbol, especially the design of point symbol attribute of word type of TrueType, which makes conveniently the point symbol for special map users needed.

A Mechanical Design Framework Based on Object-Oriented Approach

1993 ◽  
Author(s):  
Taesik Jeong ◽  
Thomas P. Kicher ◽  
Ronald J. Zab
Keyword(s):  
Design Process ◽  
Mechanical Design ◽  
Design Method ◽  
Object Oriented ◽  
Object Oriented Programming ◽  
Reduction Gear ◽  
Design Framework ◽  
Design Strategies ◽  
Decomposition Approach ◽  
Automation Systems

Abstract An object-oriented programming (OOP) technique is investigated in order to develop the framework for mechanical design automation systems. A task-oriented decomposition approach is applied to conceptualize the task-object (or task-performing-object) in which common behavior and communication protocols are encapsulated [1]. Each task in the entire design process, either controlling design strategies or performing design methods, is made into an object. The design method objects are implemented using Artificial Intelligence (AI) paradigms, such as artificial neural networks and expert systems. This report explains how OOP is integrated to develop a mechanical design framework (MDF). A single reduction gear box design process was used to identify some of the general tasks involved in mechanical design process. From this process the guidelines for developing task-objects for future systems are formed. Full details of these guidelines and an implementation example in Smalltalk on a PC are available in [7].

scholarly journals Design and control of a low-cost autonomous profiling float

2020 ◽  
Vol 21 (5) ◽  
pp. 512
Author(s):  
Thomas Le Mézo ◽  
Gilles Le Maillot ◽  
Thierry Ropert ◽  
Luc Jaulin ◽  
Aurélien Ponte ◽  
...  
Keyword(s):  
Kalman Filter ◽  
State Feedback ◽  
Design Method ◽  
Low Cost ◽  
Model Parameters ◽  
Design Rules ◽  
Profiling Float ◽  
Loop Design ◽  
Depth Control ◽  
And Control

This paper presents the development made around the SeaBot, a new low-cost profiling float design for shallow water. We introduce a simplified dynamical model of the float and propose a state feedback depth controller coupled with an Extended Kalman Filter (EKF) to estimate model parameters. We show experimental results of the depth control that validate the model and the controller. We finally propose a loop design method to build low-cost floats by highlighting key design choices along with design rules.

scholarly journals Discrete-Time First-Order Plus Dead-Time Model-Reference Trade-off PID Control Design

2019 ◽  
Vol 9 (16) ◽  
pp. 3220 ◽  
Author(s):  
Ryo Kurokawa ◽  
Takao Sato ◽  
Ramon Vilanova ◽  
Yasuo Konishi
Keyword(s):  
Discrete Time ◽  
Pid Control ◽  
Continuous Time ◽  
Dead Time ◽  
Design Method ◽  
Control Design ◽  
The Other ◽  
Time Model ◽  
Trade Off ◽  
First Order

The present study proposes a novel proportional-integral-derivative (PID) control design method in discrete time. In the proposed method, a PID controller is designed for first-order plus dead-time (FOPDT) systems so that the prescribed robust stability is accomplished. Furthermore, based on the control performance, the relationship between the servo performance and the regulator performance is a trade-off relationship, and hence, these items are not simultaneously optimized. Therefore, the proposed method provides an optimal design method of the PID parameters for optimizing the reference tracking and disturbance rejection performances, respectively. Even though such a trade-off design method is being actively researched for continuous time, few studies have examined such a method for discrete time. In conventional discrete time methods, the robust stability is not directly prescribed or available systems are restricted to systems for which the dead-time in the continuous time model is an integer multiple of the sampling interval. On the other hand, in the proposed method, even when a discrete time zero is included in the controlled plant, the optimal PID parameters are obtained. In the present study, as well as the other plant parameters, a zero in the FOPDT system is newly normalized, and then, a universal design method is obtained for the FOPDT system with the zero. Finally, the effectiveness of the proposed method is demonstrated through numerical examples.

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