Determination of Critical Speed, Slip Angle and Longitudinal Wheel Slip based on Yaw Marks Left by a Wheel with Zero Tire Pressure

2016 ◽  
Author(s):  
Jakub Zebala ◽  
Wojciech Wach ◽  
Piotr Ciępka ◽  
Robert Janczur
Keyword(s):  
Critical Speed ◽  
Slip Angle ◽  
Tire Pressure ◽  
Wheel Slip

The Study of Fuel-Saving Technology of GSI

2014 ◽  
Vol 1070-1072 ◽  
pp. 392-397
Author(s):  
Jun Hui Xu ◽  
Ming Qiu Gao ◽  
Ji Qiang Gao ◽  
Xiang Bao
Keyword(s):  
Fuel Consumption ◽  
Fuel Economy ◽  
Rolling Resistance ◽  
Fuel Saving ◽  
Pressure Monitoring ◽  
Tire Pressure ◽  
Engine Efficiency ◽  
Tire Pressure Monitoring System ◽  
The Eu

In the background of the main technologies of fuel economy in automobiles developed to a certain stage, it is necessary to reduce fuel consumption and increase the engine efficiency by developing other auxiliary technologies such as improving the ratio of pure energy drive, low rolling resistance tires, tire pressure monitoring system and gear shift indicators (GSI). This article introduces the principle of GSI, analyses how GSI works in improving engine efficiency, and then evaluates the method for determination of the relative saving rate of fuel consumption, which method was introduced in the EU regulation EC No. 65/2012.

scholarly journals Design of integrated wheel slip-skid factor and vehicle side slip angle using mamdani fuzzy control

2016 ◽  
Author(s):  
Herman M. Kaharmen ◽  
Djoko Kustono ◽  
Waras Kamdi ◽  
Tuwoso ◽  
Poppy Puspitasari
Keyword(s):  
Fuzzy Control ◽  
Slip Angle ◽  
Wheel Slip ◽  
Side Slip Angle

Slip parameter estimation of a single wheel using a non-linear observer

Robotica ◽  
2008 ◽  
Vol 27 (6) ◽  
pp. 801-811 ◽  
Author(s):  
Z. B. Song ◽  
L. D. Seneviratne ◽  
K. Althoefer ◽  
X. J. Song ◽  
Y. H. Zweiri
Keyword(s):  
Sliding Mode ◽  
Kinematic Model ◽  
Variable Structure ◽  
Lyapunov Stability Theory ◽  
Sliding Mode Observer ◽  
Slip Angle ◽  
Wheel Slip ◽  
Variable Structure System ◽  
Non Linear ◽  
Linear Observer

SUMMARYSliding mode observer is a variable structure system where the dynamics of a nonlinear system is altered via application of a high-frequency switching control. This paper presents a non-linear sliding mode observer for wheel linear slip and slip angle estimation of a single wheel based on its kinematic model and velocity measurements with added noise to simulate actual on-board sensor measurements. Lyapunov stability theory is used to establish the stability conditions for the observer. It is shown that the observer will converge in a finite time, provided the observer gains satisfy constraints based on a stability analysis. To validate the observer, linear and two-dimensional (2D) test rigs are specially designed. The sliding mode observer is tested under a variety of conditions and it is shown that the sliding mode observer can estimate wheel slip and slip angle to a high accuracy. It is also shown that the sliding mode observer can accurately predict wheel slip and slip angle in the presence of noise, by testing the performance of the sliding mode observer after adding white noise to the measurements. An extended Kalman filter is also developed for comparison purposes. The sliding mode observer is better in terms of prediction accuracy.

New Methods of Calculation for the Determination of a Special Form of Instability of the Elastic Equilibrium of a Cantilever Wing

1940 ◽  
Vol 44 (359) ◽  
pp. 816-826 ◽  
Author(s):  
Tullio Viola
Keyword(s):  
Special Form ◽  
Critical Speed ◽  
Positive Characteristic ◽  
Elastic Equilibrium ◽  
New Methods ◽  
Methods Of Calculation ◽  
Characteristic Value ◽  
Plane Form

SummaryThe superposition of the flexural instability of the plane form of a cantilever wing in its own plane, over that of the torsional elastic equilibrium, gives rise to a special phenomenon of mixed instability which has been translated analytically by Prof. C. Minelli into the problem of determining the first positive characteristic value of a certain system of two ordinary, linear and homogeneous equations, in two unknown functions, with given limiting conditions. The methods of calculation, both analytical and numerical, for the solution of this problem are described. The results confirm the intuitive inferences according to which, other conditions being equal, the backward displacement of the elastic axis worsens conditions by lowering the critical speed.

Experimental Studies of Force Systems on Steered Agricultural Tyres

1966 ◽  
Vol 181 (1) ◽  
pp. 133-148 ◽  
Author(s):  
P. A. Taylor ◽  
R. Birtwistle
Keyword(s):  
Experimental Determination ◽  
Experimental Studies ◽  
Soil Surface ◽  
Slip Angle ◽  
Vertical Load ◽  
Force Systems

The paper reports the experimental determination of the force systems acting on free-rolling 7–50 times 16 agricultural tyres, measured with a six-component suspension of the test wheel. Multivariate experimentation techniques were used involving five variables: slip angle, camber, vertical load, tyre pattern and land or furrow operation. The results are presented as three force and three moment components; other methods of representation are discussed briefly. Although the side or cornering force depends on many factors, particularly the soil surface, and is therefore difficult to predict, it is suggested that the draught force (i.e. resistance in the direction of motion) can be expressed as a function of slip for all surfaces.

scholarly journals Contribution to determination of critical speed and allowed speed of navigation for vessels in navigable canals

Tehnika ◽  
2020 ◽  
Vol 75 (1) ◽  
pp. 67-72
Author(s):  
Ivan Škiljaica ◽  
Vladimir Škiljaica
Keyword(s):  
Critical Speed

scholarly journals The influence of the tire inflation on pull properties of agriculture tractors

2013 ◽  
Vol 61 (6) ◽  
pp. 1733-1739
Author(s):  
Jakub Katrenčík ◽  
František Bauer ◽  
Petr Dostál
Keyword(s):  
Fuel Economy ◽  
Field Measurement ◽  
High Performance ◽  
Field Measurements ◽  
Reliable Operation ◽  
Multiple Methods ◽  
Tire Pressure ◽  
Wheel Slip ◽  
Agricultural Tractors ◽  
Engine Power

Agricultural tractors are robust and versatile machines, which must comply with the basic requirements of users under various conditions. The main requirements include economical and reliable operation and high performance. Fuel economy could be improved using multiple methods, for example a well trained operator, adequate farming conditions and optimal tire inflation. Tractor tires transmit engine power to the surface and as such they are crucial to tractor operation. In the first part of the field measurement, all tires were inflated to 180kPa, while in the second part of the field measurements the tire pressure was set to 75kPa in front tires and to 65 kPa in rear tires. The results of the field measurement of the John Deere 6920S tractor with different tire inflation shows that pull performance increased by 9.9% and wheel slip decreased by 9.7%.

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.

Camera Based Measurement of Side Slip Angle in an Automobile

2009 ◽  
Author(s):  
Frank Harchut ◽  
Bernhard Mueller-Bessler
Keyword(s):  
Ground Truth ◽  
Slip Angle ◽  
Passenger Cars ◽  
Side Slip Angle ◽  
Current Production ◽  
Direction Of Movement ◽  
Time Part ◽  
Vision Algorithm ◽  
Real Vehicle

For vehicle dynamics applications, automotive companies are interested in determining the precise vehicle state in every driving situation in real-time. Part of the vehicle state is the side slip angle—the angle between the vehicle heading and its direction of movement. Currently the side slip angle is not measured in stock cars. To fill the gap this paper presents a basic proof of concept to measure the side slip angle using stock car components for sensing. These include an automotive camera and additional movement information provided in current production passenger cars. A basic computer vision algorithm allows determination of camera movement through the identification of static objects in consecutive camera images. In conjunction with a kinematical model, this data is then used to derive the car’s side slip angle. Finally, the method is evaluated on a real vehicle, with dGPS providing ground truth.

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