Optimization of Vehicles Elasto-Damping Elements Characteristics from the Aspect of Ride Comfort

Demić, Miroslav

doi:10.1080/00423119408969066

Cited by 27 publications

(33 citation statements)

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“…9 9 Ž . where x 9 is torsional stiffness; D is the torsional deformation of the stabilizer, 9 . d for the engine mounting Ž .…”

Section: The Kinetic Energy Of the Systemmentioning

confidence: 99%

The Definition of the Tires Limit of Admissible Nonuniformity by Using the Vehicle Vibratory Model

Demić¹

1999

Vehicle System Dynamics

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To cite this article: Miroslav Demic (1999) The Definition of the Tires Limit of Admissible Nonuniformity by Using the Vehicle Vibratory Model, Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility, 31:3, 183-211 To link to this article: http://dx.Nonuniformity by Using the Vehicle Vibratory Modeĺ 1, )MIROSLAV DEMIC SUMMARY Purpose of this article was to especially emphasize the contribution of tires nonuniformity radial and lateral force variation to vehicles vibrations, within developed nonlinear dynamic model of a vehicle. The tire nonuniformity force variations are introduced in simulation processes by radial and lateral dynamic forces in the area of wheels-road contact.The limits of admissible Peak -to -Peak radial and lateral force variation and Peak -to -Peak first harmonic radial and lateral force variation nonuniformity were defined by using a vehicle vibratory model. The tire nonuniformity parameters were defined from the aspect of vertical seat cushion and the steering wheel rim vibrations using the developed optimization program and the Pentium 90 MHz computer.

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“…9 9 Ž . where x 9 is torsional stiffness; D is the torsional deformation of the stabilizer, 9 . d for the engine mounting Ž .…”

Section: The Kinetic Energy Of the Systemmentioning

confidence: 99%

The Definition of the Tires Limit of Admissible Nonuniformity by Using the Vehicle Vibratory Model

Demić¹

1999

Vehicle System Dynamics

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“…The effects of many parameter variations were studied, and a subset of these tests was reported in previous studies. [7][8][9] This paper contains a description of what is required to produce more improved model of a seat-occupant system 10,11 that would be useful for a car seat designer to explore the effect of changing seat characteristics such as stiffness and damping than a previous study. Figure 1 shows the car seat and mannequin system.…”

Section: Introductionmentioning

confidence: 99%

Simulations of the vibration response of mannequins in car seats by changing parameter and excitation

Kim

2010

Int. J. Precis. Eng. Manuf.

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This study is based on previously developed tools for car seat designers. A simplified modeling approach to predict the vibration response, about an operating point, of mannequin occupied car seats is demonstrated to be feasible. A two-dimensional model, consisting of rigid bodies interconnected by pin joints with torsional dampers, springs and dampers had been developed. The springs and dampers are linear and the nonlinearity in the model is due to geometric effects, although at vibration levels experienced under normal driving conditions a linearized version of the model predicts responses. The effects of changing model parameters on the natural frequencies, the mode shapes and resonance locations in frequency response functions were shown in previous papers. Reasonable qualitative as well as good quantitative agreement between experimental and simulation frequency response estimates is obtained. Especially, k2 parameter, x-directional excitation and matching between the experiment and simulation are considered. The application of these simplified models is in car seat design, where they would facilitate evaluation of the effects of seat design changes prior to prototyping.

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“…funkcije osetljivosti Ključne reči: vozilo, oscilatorni model funkcije osetljivosti 1. UVODNA RAZMATRANJA U procesu razvoja motornih vozila, značajnu ulogu ima dinamička simulacija, koja je zasnovana na modeliranju, pa se u praksi koristi čitav spektar modela vozila [1][2][3][4][5][6][7][8][9]. Pretpostavimo da mehanički model posmatranog motornog vozila opisuje, u najopštijem obliku, diferencijalna jednačina [1]:…”

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“…IZBOR OSCILATORNOG MODELA VOZILA Struktura modela vozila se bira u zavisnosti od veličina koje treba analizirati [9]. Shodno tome, u praksi se koriste oscilatorni modeli različite strukture i složenosti [1][2][3][4][5][6][7][8][9]. Naime, pri izboru modela treba težiti da oni budu što jednostavniji, a da omoguće simulaciju željene veličine [1,2,[7][8][9].…”

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Contribution to the analysis of the influence of parameters of elasto-damping elements to the vehicle ride comfort

Demic¹

2017

Tehnika

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Tokom razvoja motornih vozila, veliku ulogu ima dinamička simulacija, koja je zasnovana na modeliranju. Uloga modeliranja je veoma značajna u prvim fazama projektovanja, tokom definisanja opredeljujućih parametara. Literaturni izvori daju kompletne odgovore na uticaj sila u oprugama, amortizerima i pneumaticima na oscilatornu udobnost vozila, ali se retko ko bavio analizom parametara modela pomenutih elasto-prigušnih elemenata na oscilacije vozila. U ovom radu će biti učinjen pokušaj da se, na osnovu usvojenih modela opruga, amortizera i pneumatika, izvrši analiza uticaja njihovih parametara na oscilacije vozila.U te svrhe su korišćene tzv. funkcije osetljivosti Ključne reči: vozilo, oscilatorni model funkcije osetljivosti 1. UVODNA RAZMATRANJA U procesu razvoja motornih vozila, značajnu ulogu ima dinamička simulacija, koja je zasnovana na modeliranju, pa se u praksi koristi čitav spektar modela vozila [1][2][3][4][5][6][7][8][9]. Pretpostavimo da mehanički model posmatranog motornog vozila opisuje, u najopštijem obliku, diferencijalna jednačina [1]:̇=( , , , , , )gde su:  Z -vektor generalisanih koordinata oscilatornog sistema,  A -vektor oscilatornih parametara sistema,  U -vektor upravljačkih funkcija,  Q -vremenska funkcija pobude (od mikro-neravnina puta, rada motora, neuravnoteženih masa, neuniformnosti pneumatika i sl.).  L -funkcija koja uzima u obzir slučajnu promenu karakteristika oscilatornih parametara, u toku eksploatacije vozila i  t -vreme.Opšte rešenje vektorske diferencijalne jednačine (1) se može napisati u obliku [1]: Jednostavniji slučaj je kada ne postoji funkcija upravljanja (U=0) i kada se ne uzima u obzir promena oscilatornih parametara, u toku eksploatacije vozila (L=0), tj:Analizom izraza (3) možemo zaključiti da oscilatorni parametri (krutosti i prigušenja) značajno utiču na oslilatorna kretanja masa vozila. Tokom dinamičke simulacije se sile u oprugama, amortizerima i pneumaticima, najčešće, aproksimiraju matematičkim modelima, u kojima figurišu konstante koje opredeljuju karaker i veličinu sila u pomenutim elementima. U literaturi je poznat uticaj sila tih elemenata na oscilacije (oscilatornu udobnost) vozila, ali su nedovoljno istraženi uticaji karaktera (parametara modela). U ovom radu je učinjen pokušaj istraživanja uticaja parametara modela na oscilatornu udobnost putničkog motornog vozila srednje klase [10] primenom. tzv. funkcija osetljivosti.2. IZBOR OSCILATORNOG MODELA VOZILA Struktura modela vozila se bira u zavisnosti od veličina koje treba analizirati [9]. Shodno tome, u praksi se koriste oscilatorni modeli različite strukture i složenosti [1][2][3][4][5][6][7][8][9]. Naime, pri izboru modela treba težiti da oni budu što jednostavniji, a da omoguće simulaciju željene veličine [1,2,[7][8][9]. Imajući u vidu da je cilj ovih istraživanja bio da se analizira uticaj parametara M. DEMIĆ PRILOG ISTRAŽIVANJU UTICAJA PARAMETARA ELASTO-PRIGUŠNIH... 690TEHNIKA -MAŠINSTVO 66 (2017) 5 modela elasto-prigušnih elemenata na oscilatornu udobnost vozila, ocenjeno je korisnim da se pos...

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Optimization of Vehicles Elasto-Damping Elements Characteristics from the Aspect of Ride Comfort

Cited by 27 publications

References 3 publications

The Definition of the Tires Limit of Admissible Nonuniformity by Using the Vehicle Vibratory Model

The Definition of the Tires Limit of Admissible Nonuniformity by Using the Vehicle Vibratory Model

Simulations of the vibration response of mannequins in car seats by changing parameter and excitation

Contribution to the analysis of the influence of parameters of elasto-damping elements to the vehicle ride comfort

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