Three Models of Shimmy in Rolling Tasks of a Towed Pneumatic Wheel

2018 ◽  
Vol 53 (3) ◽  
pp. 249-255 ◽  
Author(s):  
B. M. Shifrin
Keyword(s):  
Pneumatic Wheel

On the Effects of Edge Scalloping for Collapsible Spokes in a Non-Pneumatic Wheel During High Speed Rolling

2009 ◽  
Author(s):  
Maya Ramachandran ◽  
Shashank Bezgam ◽  
Lonny L. Thompson ◽  
John C. Ziegert ◽  
Timothy B. Rhyne ◽  
...  
Keyword(s):  
High Speed ◽  
Acoustic Noise ◽  
Contact Region ◽  
Element Model ◽  
Design Criterion ◽  
Mode Shapes ◽  
Time Signal ◽  
Design Strategies ◽  
Pneumatic Wheel ◽  
Out Of Plane

The acoustic signature produced by non-pneumatic wheels with collapsible spokes is a critical design criterion for automotive and other mobility applications. During high speed rolling, acoustic noise may be produced by the interaction of vibrating spokes with a shear deformable ring as they enter the contact region, buckle and then snap back into a state of tension. In order to identify and help understand the causes of acoustic noise for a rolling non-pneumatic wheel, a two-dimensional finite element model with geometric nonlinearity has been utilized. The model consists of a shear ring modeled as two relatively inextensible membranes with high circumferential modulus separated by a hyper-elastic material. The temporal variation in spoke length as the spoke passes through the contact zone is extracted and used as input to a three-dimensional (3-D) model of a single spoke. The 3-D spoke model is able to capture out-of-plane vibration modes of the spoke which may contribute as a source of acoustic excitation and allows for modeling of edge scalloping. Natural frequencies and mode shapes of the various spoke design strategies are computed and correlated with the frequency response of the out-of-plane spoke vibrations. Results indicate that scalloping the edges of the spoke can dramatically reduce the amplitude of vibration, but does not have a strong effect on location of frequency peaks in a FFT of the time-signal. An optimal amount of scalloping was determined which reduces maximum vibration amplitude to an asymptotic value.

scholarly journals Rationale for Selecting a Method for Determining Parameters of the Contact Spot of Pneumatic Wheel Mover With Support Base

2019 ◽  
Vol 5 (6) ◽  
pp. 212-228
Author(s):  
A. Lipkan ◽  
◽  
A. Panasyuk ◽  
R. Kashbulgayanov ◽  
◽  
...  
Keyword(s):  
Contact Spot ◽  
Pneumatic Wheel

scholarly journals Evaluation of methods for experimental and analytical determination of the contour area of the contact patch of a pneumatic tire with a support base

2021 ◽  
Vol 1 (1) ◽  
pp. 40-50
Author(s):  
A.V. Lipkan' ◽  
◽  
A.N. Panasyuk ◽  
Z.A. Godzhayev ◽  
A.V. Lavrov ◽  
...  
Keyword(s):  
Field Work ◽  
Computational Method ◽  
Analytical Determination ◽  
Engineering Practice ◽  
Tire Pressure ◽  
Method Error ◽  
Digital Photograph ◽  
Contact Patch ◽  
Pneumatic Wheel

Subject of study. The results of experiments on the estimation of the error of methods of experi-mental and calculated determination of the contour area for the ecological assessment of a mobile energy device (MED) are presented. There was used the example of modern radial tires 360 / 70R24 of Bel-89 and 18.4R34 of F-11 agricultural tractor MTZ-1025.2. in modes of non-nominal loading at nominal load on tires and changes in tire pressure within the range recommended for field work. The purpose of the study. To assess the possibility of improving the computational method for determining the contour area of the contact patch of the tire tread of a pneumatic wheel based on the mathematical model of V.L. Biederman. Materials and methods. The assessment was carried out for four ways of determining the area of the tire contact patch: 1) directly measuring the area using a digital photograph of the tire contact patch in Kompas-3D V13 software with the de-termination of the scaling and method error using a square from 100x100 mm graph paper; 2) calcu-lation by the formula of the area of an ellipse, using the length and width of the tire contact patch, measured with a tape measure directly from the obtained print; 3) by calculation, determined from the digital photograph in Kompas-3D V13 software; 4) by calculation, determined by calculation using the parameters of the universal tire characteristic (UTC). Results and discussion. As a result of the experiments, it was found that for modern radial tractor tires, the static deformation of which does not exceed 18-22%, the method of theoretical determination of the contour area of the tire contact patch using the UTC parameters can be applied with sufficient (for engineering practice) accuracy. Full convergence of the calculated and experimental contour areas of the tire contact patch can be provided by the coefficient of their ratio. Conclusions. The carried out assessment of the possibility of using methods for calculating the conditional contour area of the tire showed that these methods can be well used for a comparative assessment of the technogenic mechanical impact of propellers on the soil.

Research on machining characteristic of double-layer elastomer in pneumatic wheel method

2017 ◽  
Vol 92 (1-4) ◽  
pp. 1329-1338 ◽  
Author(s):  
Xi Zeng ◽  
Jue-hui Li ◽  
Shi-ming Ji ◽  
Pan Ye ◽  
Wei Hang ◽  
...  
Keyword(s):  
Double Layer ◽  
Pneumatic Wheel

Meta-Material Design of the Shear Layer of a Non-Pneumatic Wheel Using Topology Optimization

2012 ◽  
Author(s):  
Christopher Czech ◽  
Paolo Guarneri ◽  
Georges Fadel
Keyword(s):  
Topology Optimization ◽  
Shear Layer ◽  
Material Properties ◽  
Relative Size ◽  
Material Design ◽  
Volume Averaging ◽  
Pneumatic Wheel ◽  
Elastomeric Materials ◽  
Unit Cells ◽  
Homogenization Methods

The meta-material design of the shear layer of a non-pneumatic wheel was completed using topology optimization. In order to reduce the hysteretic rolling loss, an elastic material is used and the shear layer microstructure is defined to achieve high compliance comparable to that offered by the elastomeric materials. To simulate the meta-material properties of the shear layer, the volume averaging analysis, instead of more popular homogenization methods, is used as the relative size of the shear layer places realistic manufacturing constraints on the size of unit cells used to generate the meta-material. In this design scenario the properties predicted by the homogenization methods are not accurate since the homogenization scaling assumptions are violated. A number of optimal designs are shown to have meta-material properties similar to those of the linear elastic properties of elastomers, making them good meta-material candidates for the shear layer of the non-pneumatic wheel.

Interaction in the pneumatic wheel-track system of a combination traveling transport vehicle

2008 ◽  
Vol 29 (6) ◽  
pp. 441-447
Author(s):  
V. A. Dovgyalo ◽  
D. I. Bochkarev ◽  
D. A. Chernous ◽  
S. B. Anfinogenov
Keyword(s):  
Pneumatic Wheel ◽  
Track System ◽  
Transport Vehicle ◽  
Wheel Track

Investigation on machining characteristic of pneumatic wheel based on softness consolidation abrasives

2014 ◽  
Vol 15 (10) ◽  
pp. 2031-2039 ◽  
Author(s):  
Xi Zeng ◽  
Shi-ming Ji ◽  
Ming-sheng Jin ◽  
Da-peng Tan ◽  
Jue-hui Li ◽  
...  
Keyword(s):  
Pneumatic Wheel ◽  
Softness Consolidation Abrasives

Photothermal pneumatic wheel with high loadbearing capacity

2021 ◽  
Vol 24 ◽  
pp. 100651
Author(s):  
Xuande Lv ◽  
Mingming Yu ◽  
Wenzhong Wang ◽  
Haifeng Yu
Keyword(s):  
Pneumatic Wheel ◽  
Loadbearing Capacity

Study of the correlation between the performances of lunar vehicle wheels predicted by the Nepean wheeled vehicle performance model and test data

2008 ◽  
Vol 222 (11) ◽  
pp. 1939-1954 ◽  
Author(s):  
J Y Wong ◽  
V M Asnani
Keyword(s):  
Performance Evaluation ◽  
Test Data ◽  
Performance Indicator ◽  
Normal Load ◽  
Future Generation ◽  
Performance Model ◽  
Wire Mesh ◽  
Vehicle Performance ◽  
Wheeled Vehicle ◽  
Pneumatic Wheel

This paper describes the results of a study of the correlation between the performances of wheels for lunar vehicles predicted using the Nepean wheeled vehicle performance model (NWVPM), developed under the auspices of Vehicle Systems Development Corporation, Ottawa, Canada, and the corresponding test data presented in ‘Performance evaluation of wheels for lunar vehicles’, Technical Report M-70-2, prepared for George C. Marshall Space Flight Center, National Aeronautics and Space Administration (NASA), USA, by the US Army Engineer Waterways Experiment Station (WES). The NWVPM was originally developed for design and performance evaluation of terrestrial off-road wheeled vehicles. The purpose of this study is to assess the potential of the NWVPM for evaluating wheel candidates for the new generation of extra-terrestrial vehicles. Two versions of a wire-mesh wheel and a hoop-spring wheel, which were considered as candidates for lunar roving vehicles for the NASA Apollo program in the late 1960s, together with a pneumatic wheel were examined in this study. The tractive performances of these wheels and of a 4×4 test vehicle with the pneumatic wheels on air-dry sand were predicted using the NWVPM and compared with the corresponding test data obtained under Earth's gravity and previously documented in the above-named report. While test data on wheel or vehicle performances obtained under Earth's gravity may not necessarily be representative of those on extra-terrestrial bodies, because of the differences in gravity and in environmental conditions, such as atmospheric pressure, it is still a valid approach to use test data obtained under Earth's gravity to evaluate the predictive capability of the NWVPM and its potential applications to predicting wheel or wheeled rover performances on extra-terrestrial bodies. Results of this study show that, using the ratio ( P20/ W) of the drawbar pull to normal load at 20 per cent slip as a performance indicator, there is a reasonable correlation between the predictions and experimental data. This indicates that the NWVPM has the potential as an engineering tool for evaluating wheel candidates for a future generation of extra-terrestrial vehicles, provided that appropriate input data are available.

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