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In this study, an active suspension system with multiple non-identical delayed resonators (DR) is proposed in order to, suppress vibrations that are caused by railway track irregularities. Mathematical models for a railway vehicle and track irregularities are given. In addition to this, methods on choosing the physical parameters and the design steps of multiple DR are mentioned. Simulations using...
In order to participate in the Formula SENA ECO, which is a national design and race performance competition using electric drive system vehicles, these must be lightweight, have a lower drag coefficient and high energy efficiency. An engineering redesign has been developed at the vehicle rear section using the CATIA PLM-tool, providing an optimized solution which focuses on main issues and needs...
The paper presents feedback control algorithm for active vehicle suspension systems. The algorithm uses internal model of the system which is composed with two parts: disturbances path and control path. The first is highly non-stationary while the second is constituted with relatively fixed-parameters. This difference justifies the use of limited authority adaptive control, where only disturbance...
With the reform of higher education in China, independent college plays an important role in cultivating the applied talents. However, in order to strength the competitiveness of starting a career or research ability for excellent students, teaching reform should be conducted by adding more corresponding theoretical knowledge and application practice with simulation software on currently specialized...
The unsprung mass of direct wheel drive EV is increased significantly because of the in-wheel motor or motor with reducer. This brings the negative effects of the stability, safety and the ride comfort. In this paper, several schemes of direct wheel drive system for suppressing unsprung mass negative effects were proposed. A typical scheme was modeled and simulated to verify the suppression of unsprung...
Aiming at the problem that the steering tires were seriously wore on a 8×8 in-wheel motor driven vehicle, a model of McPherson suspension and double-front axle steering system was established by ADAMS. Considering the influences on steering errors caused by wheel jump and using parametric analysis method, the error accumulation between theoretical value and actual value of steering angle, and the...
This paper studies the effect of Body Rolling of Skid-Steering Wheeled Vehicle on Steering Characteristics. Based on the 2 DOF dynamic model of skid-steering wheeled vehicle, this paper taking account of body rolling and establishes the 3 DOF dynamic model of skid-steering wheeled vehicle constructed by lateral velocity, yaw angular velocity and roll angle. With an analysis of body rolling and wheel...
There exist corresponding relationships of state information between the suspension points of the maglev train. This essay carries on the statistics of monitoring data of all the suspension points, describes the distributed situation of the suspension points data frequently spotted in engineering practices, detects suspect values and abnormal values in the suspension system based on the steady estimator...
Complicated dynamic behavior of nonlinear Four degree-of-freedom (DOF) semi-vehicle model will happen under pavement roughness incentive. In this paper, the consecutive speed control humps (SCHs) dynamic excitation function is presented. And the model can be analyzed by velocity bifurcation diagram, Poincaré map, phase diagram and power spectrum. The range of velocity is obtained under chaos vibration...
In this paper, based on the four wheel vehicle model, a new robust active suspension control scheme is developed so that ride comfort at any specified location becomes best. To achieve this end, a combined ideal vehicle model is designed. In the ideal vehicle model, the location where ride comfort becomes best can be moved easily by setting only two design parameters without redesigning of another...
A new active Hydraulically Interconnected Suspension (HIS) has been developed to compensate the limitations of conventional active suspensions such as expensive cost and high energy consumption. In this paper, the mechanism of proposed active HIS system has been briefly introduced. Fuzzy Logic Control, Fuzzy proportional-integral-derivative (PID) control and optimal linear quadratic regulator (LQR)...
This paper investigates the energy consumption of the lateral secondary active suspension for railway vehicles and studies the conditions for self-powered active suspension control. The influence of the performance index weighting factors to both the ride quality and the energy consumption is discussed based on the linear quadratic regulator (LQR) algorithm. Then the energy balance condition is analyzed...
The paper proposes the design of a variable-geometry suspension system, which affects both steering by generating additional steering angle and wheel tilting by modifying the camber angle. The control system must guarantee various performances such as trajectory tracking, the reduction of the chassis roll angle and the minimization of half-track change. The control design is based on a two-step procedure...
The road profile is one of the most important factors that determines the automotive vehicle performance; specially, when it is used to adapt the suspension features. Direct measurements of the road represent expensive solutions and are susceptible to be contaminated. This paper proposes a novel road profile estimation method based on classic vehicle measurements to online compute the road roughness...
This paper investigates a method for estimating an off-road terrain profile using a vehicle suspension model. An augmented state Kalman filter (ASKF) is presented as a means to estimate the unknown inputs of the 7-DOF full suspension model. The Weierstrass-Mandelbrot function was used to generate a fractal terrain surface for a vehicle simulation. The terrain surface was used with Carsim in a simulation...
In this paper, a novel coordinated control method of longitudinal/lateral/vertical tire forces is proposed which overcomes the shortcomings of current studies on global chassis control for electric vehicles. An objective function combining the tire workload and the dynamic ratio of vertical forces is developed, 15 equality and inequality constraints including desired driving demands, tire friction...
This paper addresses an integration of two advanced vehicle controllers. The first one is developed for coupled control of longitudinal and lateral vehicle's motions. It takes advantage of differential flatness of nonlinear systems and algebraic identification techniques for denoising and numerical differentiation. The second one is an LPV/ℋ∞ controller for suspension system designed to adapt the...
The mechatronics systems are widely used in modern society. This paper presents a novel data-driven scheme which can be used for fault diagnose of mechatronics systems. The proposed method is based on the subspace identification of parity vector. By constructing the output observer, critical variables can be acquired by soft sensors. This makes the fault diagnoses free from the limitation of online...
This paper focuses on the application of active suspensions to vehicles with solid-axles for medium and light duty trucks. These vehicles are prone to rollover issues and compromised ride quality. A cascade control structure is proposed considering a time scale analysis of the various modes in the vehicles' dynamics. The structure consists of: a) an upper level predictive anti-roll controller that...
The performance evaluation of active suspension system of vehicle is critically reliant on estimation of random road roughness profile. In this paper, the nonlinear dynamics of spring and damper of the active suspension system are considered to develop a nonlinear model excited by the random road excitation profile as an unknown input. To estimate the unknown input, an adaptive super-twisting algorithm...
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