Application of Constant Amplitude Dynamic Tests for Life Prediction of Air Springs at Various Control Parameters

Bešter, Tomaž; Fajdiga, Matija; Nagode, Marko

doi:10.5545/sv-jme.2013.1348

Cited by 6 publications

(4 citation statements)

References 10 publications

(10 reference statements)

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“…The phenomena accompanying the flow of gases are complex; therefore, they are the subject of research in many research centres. The issue of the work includes modelling and numerical analyses of elements and systems such as pneumatic cylinders [7], pneumatic vibration isolation systems with multiple air chambers [8] or air springs [9]. Another crucial issue is the appropriate control of the airflow rate.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Pneumatic Cushion Operation Safety, including the Airflow Conditions

FILO

2023

Quality Production Improvement and System Safety

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Abstract. This work concerns studying the characteristics of a pneumatic cushion in a system for moving heavy loads. Particular emphasis has been placed on the airflow parameters through the main supply nozzle, including the average flow velocity. Critical flow at the speed of sound can occur under certain circumstances. In the subsequent steps, a mathematical model of a pneumatic cushion was formulated, next, a simulation model was built in the Matlab/Simulink system, and then numerical simulations were carried out. As a result, it was estimated whether there is a flow with a safe, appropriately low speed in a given range of load and supply pressure.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Pneumatic Cushion Operation Safety, including the Airflow Conditions

FILO

2023

Quality Production Improvement and System Safety

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“…Very similar materials and material designs are used in the spring stage for high comfort applications or for level control. These air suspension systems are used in both cars and trucks to provide the vertical suspension [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…These support the design in terms of load capacity. Several fatigue life studies with many component tests have been carried out for trucks, buses and automotive applications [8,[11][12][13]. However, in these similar applications, the components are loaded in a completely different way to that of the railway application.…”

Section: Introductionmentioning

confidence: 99%

Investigating Damage Mechanisms in Cord-Rubber Composite Air Spring Bellows of Rail Vehicles and Representative Specimen Design

Torggler,

Dutzler,

Oberdorfer

et al. 2023

Appl Compos Mater

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Cord-rubber materials are used in crucial components of rail vehicles, such as air spring bellows in secondary suspension. A detailed understanding of the material behaviour of these components is thus of the utmost importance at an early stage of development. In general, a minor knowledge of the fatigue behaviour is currently all that is available today, while empirical methods involving designer experiences are in most cases essential requirements for this work. The design can be carried out more efficiently based on a representative cord-rubber composite specimen than on an entire air spring bellow. In this paper, the design of such representative specimens is shown taking different geometries and test conditions into consideration. It is found, that a flat specimen design is suitable for analysing the base material under different loading scenarios. The design and optimisation of the specimen geometry was carried out using finite element analysis, which was validated by means of optical strain measurement. The test procedure for the specimen was designed to provide a sound transferability to experimental testing of the components. A fracture pattern study was carried out using radiography and micro computed tomography. The results show, that the dominant damage mechanism is the separation of the layers from each other, denoted as delamination. In conclusion, the developed specimen is well suited for further investigations of the composite material. Furthermore, it will significantly accelerate the development of new air springs and new layups in particular. Future work will focus on a systematic investigation of the fatigue behaviour of the cord-rubber composite air-spring bellows based on the fatigue data of the representative specimens designed in this work.

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“…In [2], the influence of the cord angle on the air-spring fatigue life is presented. Constant amplitude tests were used to make life predictions based on the standardised load spectrum in [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Efficiency of a Test Rig for Air Springs

Okorn

Nagode

2015

SV-JME

Self Cite

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During dynamic testing of vehicle air springs, work is required for loading the springs. This work is partially returned by the spring to the driving system during the release phase. Testing is energy-efficient when at least a portion of the returned work can be utilised. This was taken into account in the design of the new inovative test rig for the simultaneous testing of four air springs. There is a phase shift between the phases of loading individual air springs; thus, the work returned to the drive system by a spring during its release is also used for loading another spring. The test rig was constructed and operates in the laboratory of an air spring manufacturer. We developed a computer program to analyse the energy situation in the test rig. The program calculates the work required for loading the springs, power and friction for different sizes of springs and test conditions. In this paper, computational algorithms are deduced and the results of the calculation for the treated spring are presented. The energy situation in the test rig during start-up and operation is discussed, taking into account the energy loss due to the hysteresis of springs and friction losses. The friction losses are evaluated for different implementations of critical elements. The influence of a flywheel on conditions during the start-up and operation of the test rig is analysed.

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Application of Constant Amplitude Dynamic Tests for Life Prediction of Air Springs at Various Control Parameters

Cited by 6 publications

References 10 publications

Numerical Analysis of a Pneumatic Cushion Operation Safety, including the Airflow Conditions

Numerical Analysis of a Pneumatic Cushion Operation Safety, including the Airflow Conditions

Investigating Damage Mechanisms in Cord-Rubber Composite Air Spring Bellows of Rail Vehicles and Representative Specimen Design

Analysis of Energy Efficiency of a Test Rig for Air Springs

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