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Fatigue Damage Modeling Approach Based on Evolutionary Power Spectrum Density

Concordia University-Ayhan Ince, Jean-Gabriel Lacombe
Purdue University-Zhui Li
Published 2019-04-02 by SAE International in United States
Fatigue damage prediction approaches in both time and frequency domains have been developed to simulate the operational life of mechanical structures under random loads. Fatigue assessment of mechanical structures and components subjected to those random loads is increasingly being addressed by frequency domain approaches because of time and cost savings. Current frequency-based fatigue prediction methods focus on stationary random loadings (stationary Power Spectral Density), but many machine components, such as jet engines, rotating machines, and tracked vehicles are subjected to non-stationary PSD conditions under real service loadings. This paper describes a new fatigue damage modeling approach capable of predicting fatigue damage for structures exposed to non-stationary (evolutionary) PSD loading conditions where the PSD frequency content is time-varying. The underlying concept of the proposed approach is that the evolutionary response PSD function of a structure can be decomposed into a finite number of narrow frequency bands which can be associated with Rayleigh distributions. Fatigue damage is estimated by summing up damages for each individual band on the basis of an appropriate damage accumulation rule. The proposed…
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ERRATUM: Design of Adjustable Road Feeling Performance for Steering-by-Wire System

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Concordia University-Bin Li
Jilin University-Hongyu Zheng, Jian Zhou
  • Journal Article
  • 10-02-02-0008.1
Published 2018-09-21 by SAE International in United States
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Optimization Control for 4WIS Electric Vehicle Based on the Coincidence Degree of Wheel Steering Centers

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Concordia University-Bin Li
Jilin University-Hongyu Zheng, Shuo Yang
  • Journal Article
  • 10-02-03-0011
Published 2018-07-24 by SAE International in United States
The steering centers of four wheels for passenger car do not coincide, which may result in tire wear and the unharmoniously movement of the vehicle. In this article, an optimization control method for Four Wheel Independent Steering (4WIS) electric vehicle based on the coincidence degree of steering centers is proposed, to improve the driving performance. The nonlinear vehicle model of the four-wheel independent steering vehicle is established, and the formula of the wheel steering center is derived. The coincidence degree of wheel steering centers is defined as the evaluation index, to describe and evaluate the performance of the coordination for wheels’ movement. Meanwhile, the structure design of 4WIS system and the establishment of Direct-Current (DC) steering motor model are carried out, and the Model Predictive Control (MPC) controller for steering actuator is designed. The coincidence degree and related performance index for 4WIS vehicle steering system are performed as the optimization target for vehicles to achieve the optimal control by neural network predictive control algorithm. Simulations based on high-fidelity CarSim model show the effectiveness of the…
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Design of Adjustable Road Feeling Performance for Steering-by-Wire System

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Concordia University-Bin Li
Jilin University-Hongyu Zheng, Jian Zhou
  • Journal Article
  • 10-02-02-0008
Published 2018-06-18 by SAE International in United States
Since steering-by-wire (SBW) system decouples mechanical linkages between front tires and the steering wheel, the road feeling characteristics of SBW system can be designed flexibly to improve the driving experience. In this article, a road feeling system with adjustable performance is proposed based on integrating the elements of the steering wheel module and the steering actuator module of SBW system. In this system, the road feeling torque consists of a main toque and a tuning torque, which are deduced by parametric method. The main torque is to feed back the tire dynamics and road properties to the driver intuitively, and the tuning torque is designed as a compensation of the main torque to tune the road feeling performance. The parameters in the formula of road feeling torque are selected properly and the driver can get the preferred road feeling performance by tuning these parameters in the formula. Next, to obtain the desired road feeling characteristics for different drivers, the sensitivity of formula parameters is analyzed quantitatively according to objective evaluation indices for on-center handling. Then,…
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Analysis of a Flow Volume Regulated Frame Steering System and Experimental Verifications

Concordia University-Yuming Yin, Subhash Rakheja
IRSST Montreal-P. E. Boileau
Published 2015-09-29 by SAE International in United States
The articulated frame steering (AFS) systems are widely implemented in construction, forestry and mining vehicles to achieve enhanced maneuverability and traction performances. The kinematic and dynamic performances of articulated steered vehicles are strongly influenced by properties of the frame steering system. In this paper, a flow volume regulated frame steering system is described and analytically modelled. The analytical model of the steering system is formulated in conjunction with yaw-plane model of a 35 tonnes mining vehicle to investigate steady as well as transient responses of the steering system and the vehicle. A field test program was undertaken to measure responses of the steering system and the vehicle under nearly constant speed turning as well as path-change maneuvers. The validity of the vehicle and the steering system model is demonstrated on the basis of the measured data in terms of steering wheel angle, articulation angle, hydraulic struts pressure, struts displacements and vehicle yaw rate. The results revealed reasonably good agreements between the measured and model responses under the maneuvers considered. The model could thus serve as…
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Jackknifing Prevention of Tractor-Semitrailer Combination Using Active Braking Control

Concordia University-Bin Li, Subhash Rakheja
Published 2015-09-29 by SAE International in United States
Vehicle jackknifing is generally associated with the loss of yaw stability, and is one of the most common cause of serious traffic accidents involving tractor-semitrailer combinations. In this paper, an active braking control strategy is proposed for jackknifing prevention of a tractor-semitrailer combination on a low friction road. The proposed control strategy is realized via upper-level and lower-level control structures considering braking of both the units. In the upper-level control, the required corrective yaw moments for tractor and semitrailer are generated using a PID controller aiming to reduce errors between the actual yaw rates of tractor-semitrailer and the target yaw rates deduced from a reference model. The corrective yaw moments are achieved through brake torque distribution among the tractor and semitrailer axle wheels in the lower-level control. The effectiveness of the proposed jackknifing prevention control is evaluated in a co-simulation environment involving Matlab/Simulink and TruckSim under two different maneuvers on a slippery road surface. Simulation results show that the proposed control approach is effective in jackknifing prevention of the tractor-semitrailer combinations under high speed maneuvers…
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Effects of Liquid Cargo on Lateral Stability of B-Train Combination

Concordia University-Iman Hazrati Ashtiani, Mehrnoosh Abedi
Published 2014-09-30 by SAE International in United States
Road train vehicles have been applied as one of the common and efficient ways for transportation of goods, specifically hazardous liquid cargos, in different nations. These vehicles have a wide variety of lengths and towing systems such as the fifth wheel or the dolly draw-bar. Based upon specific regulations, they could be authorized to move on specific roads. In order to avoid hazard and danger in case of accidents, safety performance of a B-train vehicle as a specific type of road train vehicles is investigated in this paper. A Multi-Body Dynamic (MBD) model, which consists of a prime mover and two trailers coupled by fifth wheels, are simulated in the initial phase of the study. The developed dynamic model is capable of simulating required tests as well as the SAE lane change, along with a constant radius turn for the purpose of roll and yaw stability analysis and safety evaluation. The effects of variation of the fluid fill level are considered in this research. The trammel pendulum concept is adopted for simulation of fluid movements,…
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CATIA V5-Based Parametric Aircraft Geometry Modeler

SAE International Journal of Aerospace

Concordia University-Xiao Cai
Bombardier Aerospace-Siddhartho K. Banerjee, Percey Thomas
  • Journal Article
  • 2013-01-2321
Published 2013-09-17 by SAE International in United States
Current transport aircraft are mature systems, thus require increased fidelity at the beginning of the design process to allow further optimization. Furthermore, a desire exists to explore unconventional aircraft configurations at the conceptual level. This has motivated the development of a tool which effectively manages the trade-off between high-fidelity levels, flexibility and short turn-around times. This paper presents a CATIA V5-based parametric aircraft geometry modeler developed by Bombardier Aerospace. The aim of the tool is to provide consistent high-fidelity geometric data early in the conceptual aircraft design process.The intended near-term use of the modeler is two-fold: during the early design phase, the modeler computes geometric data such as areas, volumes, ESDU aircraft parameters, etc. In the competitive analysis domain, the tool provides a high-quality three-dimensional model with manageable effort. In both cases, the engineer is presented with a fully parametric three-dimensional CATIA V5 aircraft model. In the medium-term, use by expert departments is envisioned. Moreover, the geometrical data extracted from CATALIST can be saved into a standard database and fed to various analysis codes to…
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Application of Boundary Characteristic Orthogonal Polynomials on Vibration of Circular Plates with Circular Eccentric Holes

SAE International Journal of Passenger Cars - Mechanical Systems

Concordia University-Khodabakhsh Saeedi, Rama Bhat, Ion Stiharu
Camfil Farr Canada Inc.-Alfin Leo
  • Journal Article
  • 2011-01-1688
Published 2011-05-17 by SAE International in United States
A new approach is proposed to solve for the eigen-values and eigen-functions of circular plates with circular holes by using the Rayleigh Ritz Method. In this method, the spatial solution is expanded into separable functions in terms of polar coordinates. While trigonometric functions are used along the circumferential direction, the Boundary Characteristic Orthogonal Polynomials build the radial shape functions. Written in terms of the assumed functions, the potential and kinetic energies are modified in order to account for the holes. Although the proposed approach is applicable for plates with different boundary conditions and different hole shapes, the free vibration of a clamped circular plate with circular holes is considered in the present study. The edges of the holes are free. Four different case studies are carried out. The results of the Rayleigh Ritz Method are compared with those available in the literature.
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Analysis of Ride Vibration Environment of Soil Compactors

SAE International Journal of Commercial Vehicles

Concordia University-Subhash Rakheja, Alireza Pazooki, Dainius Juras
IRSST-Pierre Marcotte PhD
  • Journal Article
  • 2010-01-2022
Published 2010-10-05 by SAE International in United States
The ride dynamics of typical North-American soil compactors were investigated via analytical and experimental methods. A 12-degrees-of-freedom in-plane ride dynamic model of a single-drum compactor was formulated through integrations of the models of various components such as driver seat, cabin, roller drum and drum isolators, chassis and the tires. The analytical model was formulated for the transit mode of operation at a constant forward speed on undeformable surfaces with the roller vibrator off. Field measurements were conducted to characterize the ride vibration environments during the transit mode of operation. The measured data revealed significant magnitudes of whole-body vibration of the operator-station along the vertical, lateral, pitch and roll-axes. The model results revealed reasonably good agreements with ranges of the measured vibration data. The ride dynamic responses of the soil compactor model were subsequently analyzed to study its whole-body vibration environment while operating on undeformable random terrain surfaces. Parametric sensitivity analyses were performed to study influences of different design parameters on the whole body vibration responses, which included the drum and cab vibration isolators, vertical seat…
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