Dynamic Modeling of Gas Springs

Kornhauser, Alan A.

doi:10.1115/1.2899236

Cited by 13 publications

(8 citation statements)

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“…Numerical simulations can be performed by entering equations (4), (5), (7), (8), (10), (11) and (12) in the block model. Mapped experimental data can also be substituted for equations (4), (7) and (11) in the model for a better ®t with actual experimental conditions.…”

Section: Frequency Response Of the Nonlinear Modelmentioning

confidence: 99%

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Air Suspension Dimensionless Analysis and Design Procedure

Quaglia¹,

Sorli²

2001

Vehicle System Dynamics

152

122

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This article presents the dimensionless model and the design considerations of a pneumatic suspension with auxiliary reservoir. The dimensionless model provided makes it possible to fully understand the effect of the parameters which de®ne the suspension and to select the spring type correctly. Without this selection, the suspension generates transmissibility curves with excessive ampli®cation in the vicinity of the resonance, even after optimum de®nition of auxiliary volume and resistance. This aspect is the key point for de®ning effective applicable solutions. The design considerations provided at the end of the work constitute a useful re Âsume Â and a guide for designing suspensions of the type described.

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Section: Frequency Response Of the Nonlinear Modelmentioning

confidence: 99%

“…Gas springs on their own are also the subject of research at present [10,11], as spring performance is in¯uenced by heat exchanges, dif®cult to assess experimentally, and by the characteristics of the material used.…”

Section: Introductionmentioning

confidence: 99%

Air Suspension Dimensionless Analysis and Design Procedure

Quaglia¹,

Sorli²

2001

Vehicle System Dynamics

152

122

View full text Add to dashboard Cite

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“…The gas generated heat flux is experimentally determined and is lower than 0.8 MW/m 2 [56]. According to our numerical model the maximum surface temperature will be lower than 200…”

Section: Operating Conditionsmentioning

confidence: 99%

On the design of lubricant free piston compressors

Owczarek¹

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“…Despite similarities to the force-distance relationship of conventional mechanical springs, this relationship in air-springs is more complex. This is due to non-linearity brought about by spring geometry and 'complex interaction of heat transfer, fluid mechanics and thermodynamics' (Kornhauser, 1994).…”

Section: Literature Surveymentioning

confidence: 99%

“…Improvement has been made in the accuracy of the spring models by incorporating the thermodynamic, heat transfer and fluid mechanic components in the models (Kornhauser, 1994).…”

Section: Modellingmentioning

confidence: 99%

Modelling and design of a novel air-spring for a suspension seat

Holtz

Niekerk

2010

Journal of Sound and Vibration

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Fakulteit Ingenieurswese• Faculty of Engineering D e p a r t e m e n t M e g a n i e s e I n g e n i e u r s w e s e• D e p a r t m e n t o f M e c h a n i c a l E n g i n e e r i n g P r i v a a t S a k / P r i v a t e B a g X 1 • M a t i e l a n d , 7 6 0 2 • S u i d -A f r i k a / S o u t h A f r i c a , T e l : + 2 7 ( 0 ) 2 1 8 0 8 4 3 7 6• F a k s / F a x : + 2 7 ( 0 ) 2 1 8 0 8 4 9 5 8Modelling and Design of a Novel Air-Spring for a Suspension Seat Marco Wilfried HoltzFakulteit Ingenieurswese • Faculty of Engineering D e p a r t e m e n t M e g a n i e s e I n g e n i e u r s w e s e• D e p a r t m e n t o f M e c h a n i c a l E n g i n e e r i n g P r i v a a t S a k / P r i v a t e B a g X 1 • M a t i e l a n d , 7 6 0 2 • S u i d -A f r i k a / S o u t h A f r i c a , T e l : + 2 7 ( 0 ) 2 1 8 0 8 4 3 7 6• F a k s / F a x : + 2 7 ( 0 ) 2 1 8 0 8 4 9 5 8 AbstractSuspension seats are commonly used for earth moving machinery to isolate vehicle operators from vibrations transmitted to the vehicle body. To provide the required stiffness and damping for these seats, air-springs are typically used in conjunction with dampers. However, to eliminate the need for additional dampers, air-springs can be used in conjunction with auxiliary air volumes to provide both spring stiffness and damping. The damping is introduced through the flow restriction connecting the two air volumes.In this study, simplified models of an air-spring were derived followed by a model including the addition of an auxiliary volume. Subsequent to simulations, tests were performed on an experimental apparatus to validate the models.The air-spring models were shown to predict the behaviour of the experimental apparatus. The air-spring and auxiliary volume model followed the trend predicted by literature but showed approximately 27 % lower transmissibility amplitude and 21 % lower system natural frequency than obtained by tests when using large flow restriction diameters. This inaccuracy was assumed to be introduced by the simplified mass transfer equations defining the flow restriction between air-spring and auxiliary volume. The models however showed correlation when the auxiliary volume size was decreased by two thirds of the volume actually used for the experiment.This design of a prototype air-spring and auxiliary volume is presented for a suspension seat used in articulated or rigid frame dump trucks. The goal of this study was to design a suspension seat for this application and to obtain a SEAT value below 1,1. The design was optimised by varying auxiliary volume size, flow diameter and load. A SEAT value of less than 0,9 was achieved.iii UittrekselSuspensie sitplekke word dikwels in grondverskuiwingsvoertuie gebruik om bestuurders te isoleer van die vibrasies wat vanaf die voertuig se onderstel oorgedra word. Om die nodige styfheid en demping vir hierdie sitplekke te voorsien, word daar normaalweg lug-vere te same met dempers gebruik. Om die noodsaaklikheid van ekstra dempers uit te skakel, word lugvere met eksterne lug volumes gebr...

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Dynamic Modeling of Gas Springs

Cited by 13 publications

References 0 publications

Air Suspension Dimensionless Analysis and Design Procedure

Air Suspension Dimensionless Analysis and Design Procedure

On the design of lubricant free piston compressors

Modelling and design of a novel air-spring for a suspension seat

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