To overcome the increase in unsprung mass and deformation of magnet gap for in-wheel-motor-propelling systems, a novel topology scheme had been presented previous work. In this study, an optimal matching design between suspension rubber bushing is employed system to reduce effect road surface roughness on as much possible, basis good ride quality comfort. First, half-vehicle model set up. Second, objective function developed using weighting coefficient method obtain balanced consideration...

To improve the ride comfort of vehicle and high-efficiency control requirements suspension, this paper proposes a time-delay strategy idea using linear motor as actuator. This analyses damping characteristics in time domain frequency domains. A equivalent excitation method is proposed to optimise optimal parameters under complex excitations. The stability system analysed. effect active suspension verified by numerical simulation. An experimental hardware platform was built further verify...

A 2-DOF vehicle active suspension system model with time-delay feedback control is established. The stability region of the obtained by using Routh-Hurwitz criterion and polynomial discriminant theory. multi-objective optimization function established taking into account ride comfort, driving safety, handling stability, optimal parameters are particle swarm optimization(PSO) algorithm. vibration characteristics systems under different road excitations studied through experiments simulations...

With the application of an active control unit in suspension system, phenomenon time delay has become important factor system. Aiming at time-delay feedback vehicle systems, this paper researched dynamic behavior semivehicle four-degree-of-freedom structure including with double control, focusing on analyzing vibration response and stability main system structure. The optimal objective function is established according to amplitude-frequency characteristics parameters are obtained by using...

The existing available research outcomes on vibration attenuation control for time-delay feedback indicate that, the delay dynamic absorber with fixed parameters, under harmonic excitation, a good effect occurs of main system. However, is not obvious complex excitation. Aiming at above problems, in short time interval, excitation same displacement size as was established. Then, by calculating its equivalent amplitude and frequency, method proposed this paper. parameters were adjusted...

Vehicles driving on the road continuously suffer low-frequency and high-intensity excitation, which can cause occupant feelings of tension dizziness. To solve this problem, a three-degree-of-freedom vehicle suspension system model including seat is established linear function equivalent excitation method proposed. The optimization random transformed into constant force in discrete time interval, introduces adaptive weighted particle swarm algorithm to optimize delay feedback gain parameters...

The combination of dynamic vibration absorber and partial state feedback with time-delay is called delayed resonator. In order to suppress the seat caused by uneven road surface improve ride comfort, resonator applied suspension realize active control system. model half-vehicle system established, differential equation under external excitation solved precise integration method. root mean square time-domain response displacement, acceleration vehicle are selected as objective function. Then,...

In this paper, the mechanical model of two-degree-of-freedom vehicle semi-active suspension system based on time-delayed feedback control with vertical acceleration body was studied. With frequency-domain analysis method, optimization parameters in effective frequency band studied, and a set method “equivalent harmonic excitation” proposed. The time-domain simulation results show that compared passive control, under optimal effectively broadens vibration absorption bandwidth system. ride...

When running in idle condition, the vehicle has no speeds and road excitation, engine vertical self-vibration is main excitation source. In this paper, a five-degree-of-freedom half-vehicle suspension model with double-delay feedback control proposed to improve vibration performance condition. First, according system amplitude–frequency characteristic, multiobjective function combining body acceleration pitching angular established. Then, utilizing particle swarm optimization optimizing...

An optimal control method is provided to mitigate the cubic strongly nonlinear vibration of vehicle suspension with velocity and displacement feedback controllers. The forced studied utilizing methods modified Lindstedt-Poincaré multiple scales. Ranges gains that can keep system stable are worked out by stability conditions eigenvalue equation. Taking decay rate energy function as objective functions ranges constrained conditions, calculated minimum method. simulation results show have results.

To address the contradiction between ride comfort and handling stability, a new vibration-absorbing wheel structure with time-delay feedback control was proposed by applying feedback-controlled dynamic vibration absorber to structure. Using H2 optimization particle swarm algorithm (PSO), design parameters of were obtained sprung mass acceleration (SMA), suspension deflection (SD) tire (DTD) as objective functions. The stability interval system analyzed using Routh–Hurwitz criterion Sturm...

Suspension system is one of the important parts a vehicle, which used to buffer impact uneven road body and passengers, so suspension has an on safety ride comfort vehicle. In order improve passengers vehicles, in this paper five-degree-of-freedom half car model established, uncertainty time-delay control are considered. The dynamic response vehicle acceleration root mean square, passenger displacement square pitch selected as optimization objectives. parameters determined by chaos particle...

Considering the nonlinear properties of spring and damping suspension, a quarter-car model with time-delayed control is established. The Routh–Hurwitz stability criterion switching method are used to analyze system obtain region diagram. multiobjective optimization function established by considering ride comfort, driving safety, handling stability. optimal parameters obtained simulation under harmonic excitation random excitation. In addition, responses active suspension time-delay passive...

Time-delay feedback control can effectively broaden the damping frequency band and improve efficiency. However, existing time-delay strategy has no obvious effect on multi-frequency random excitation vibration reduction control. That is, when of external is more complicated, there better way to obtain best parameters. To overcome this issue, paper first work proposing an optimal calculation method that introduces stochastic into process solving delay It a parameter with for excitation. In...

With the aim of enhancing both ride comfort and safety vehicle, we propose a new type suspension with an annular vibration-absorbing structure, establish 3-DOF 1/4 vehicle model. The structure parameters time-delay feedback control are determined by particle swarm optimization algorithms, which take root mean values body acceleration, dynamic deflection, tire displacement as their objectives. We analyze stability system to ensure through Routh-Hurwitz criterion, characteristic method,...

Abstract Time‐delay significantly impacts the control system's performance and even leads to unexpected instability of system. This paper aims at adverse effect time‐delay on stability active suspension proposes suppress vehicle body vibration by applying displacement feedback. In this paper, characteristics system are studied combining theory with experiment. first establishes dynamic Equation time‐delay. Then, frequency domain sweep method is used analyze Finally, simulation model...

The dynamic equations of the strongly nonlinear vibration vehicle suspension with linear and feedback controllers are developed. is transformed into weakly by controller. forced studied method multiple scales. regions gains obtained from stability conditions eigenvalue equation quantitatively presented. Taking attenuation ratio energy function as objective functions, control parameters velocity displacement calculated minimum optimal method. Illustrative examples given to show effectiveness control.

This paper proposes parameter controlling optimization of the time-delay feedback that is based on "equivalent harmonic excitation" in effective frequency band towards delay control parameters for vehicle semi active suspension system. In this way, optimal values different types (displacement, velocity and acceleration) wheels are obtained. Finally, through stability analysis semi-active system wheel numerical simulation time-domain response performance evaluation index, superiority strategy...

To reduce seat vibration caused by uneven road surfaces, the time-delay feedback control into suspension system was introduced and an active method based on proposed in this paper. A three-degree-of-freedom (3-DOF) model with established. The independent stability region critical curve of were derived using characteristic root switching. effect parameters investigated region. acceleration (SA), body (BA), dynamic deflection (SDD), tire displacement (TDD) used as multi-objective optimization...

Hydraulic accumulator type braking energy regeneration system have the advantages of high power density, low cost and reliable property, which is suitable for traditional engine driving bus. The variable displacement hydraulic pump/motor used recovery as conversion device, its structure parameters affected rate rate. In this paper, composition was designed, influencing factors recycle analyzed, a method optimization putted forward, transmission were optimized, that equipped on Zhongtong...

The nonlinear time-delay dynamic absorber has a good control effect on the main system under harmonic excitation, but complicated excitation is not obvious. In previous study, they do have an effective method to obtain parameters different external excitations. Because of above problems, this paper proposed innovative absorbers. For vibration including absorber, transient time-integration was used solve delay differential equation specific excitation. Then, quantitative relationship...

In this paper, a nonlinear two-degrees-of-freedom active suspension system model with time-delayed feedback control is studied. It well known that time delay has destabilizing effect in mathematical models. A stability judgment method proposed, which produced the process of seeking analytic solutions by using multiple-scales method. The influence parameters on vibration reduction optimal parameter combination obtained. Numerical simulations are provided to support theoretical analysis....

In this paper, the various damping factors that affect design of throttle slice thickness were analysed, and mathematical model for by single velocity point was found. Based on this, we studied method optimisation target function curve-fitting established. A practical example telescopic shock absorber is given, designed value compared with shown blueprint factory. The performance test conducted developed new methods, desired values, tested values approach desired. experiment results show...