Zeitschriftenartikel: „Rolling resistance coefficient“

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Schindelwig, Kurt, Martin Mössner, Michael Hasler und Werner Nachbauer. „Determination of the rolling resistance of roller skis“. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 231, Nr. 1 (01.08.2016): 50–56. http://dx.doi.org/10.1177/1754337116628719.

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The rolling resistance of skis used in roller skiing competitions should resemble the gliding resistance of cross-country skis to allow specific training and moving patterns for cross-country skiing and to guarantee equal opportunities for athletes in roller ski races. Therefore, the purpose of this work was to develop a portable rolling resistance meter to precisely measure the rolling resistance of roller skis. Measurements were based on recordings of the angular deceleration of a flywheel due to the rolling resistance between a roller ski’s wheel and the flywheel’s steel surface. Rolling resistance coefficients of four roller ski types ranged between 0.019 and 0.025. Measurements of the rolling resistance coefficient showed a precision of 1.26%. Substantial rolling resistance coefficient variations (10%) were observed for wheels of the same type. Furthermore, the rolling resistance coefficient was found to be negatively correlated with normal load or ambient temperature. The proposed rolling resistance meter is appropriate to determine the rolling resistance coefficient of roller skis’ wheels precisely.

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Wrzecioniarz, Piotr, Wojciech Ambroszko und Aleksandra Pindel. „Limitations of vehicle movement resistances: rolling resistance“. AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, Nr. 12 (31.12.2018): 256–59. http://dx.doi.org/10.24136/atest.2018.394.

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In the paper limitations and exemplary methods of rolling resistance minimization are described. Changes of value of rolling resistance coefficient during years and values for exemplary rolling pairs are presented. Conclusions about future progress are formulated.

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Lin, Hong Liang, Qiang Yu und Xue Li Zhang. „A New Computational Model about Vehicle’s Sliding Resistance Coefficients“. Advanced Materials Research 228-229 (April 2011): 60–65. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.60.

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Vehicle’s sliding resistance mainly includes rolling resistance, air drag resistance and friction within the transmission, wheel bearings and other related components. Among those, rolling resistance and air drag always exist whenever vehicle is running, so they have great influence on vehicle’s dynamic performance and fuel economy. Therefore, it is important to determine vehicle’s rolling resistance coefficient and air drag coefficient quickly and accurately in order to operate vehicle properly and reduce the vehicle’s fuel consumption. Combining theoretical analysis with experimental verification, calculation model based on road coasting test was given by means of least squares principle. And through which vehicle rolling resistance coefficient and air drag coefficient were determined easily. Then by using the test data from some Minibus, the vehicle's rolling resistance coefficient and air drag coefficient are calculated according to established model. The computation result shows that rolling resistance coefficient is a linear function of the speed and the air drag coefficient is constant. Finally, the analysis shows that the calculation model is simple, precise and useful.

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Jiao, Zhi Jie, Chun Yu He, Jian Ping Li und Xiang Hua Liu. „Study of Rolling Force Calculation Models for Cold Rolling Process“. Advanced Materials Research 154-155 (Oktober 2010): 882–85. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.882.

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For cold rolling process, the theoretical Bland-Ford-Hill model and Hitchcock model are used for the rolling force and roll flatten radius calculation. Friction coefficient and deformation resistance are calculated with empirical regression models. From rolling force model, the recalculation model for the friction coefficient and deformation resistance can be derived. After rolling, with actual measured data, friction coefficient and deformation resistance can be recalculated, and model parameter can be got by regression method. The practical application verifies that the accuracy of rolling force calculation model is good.

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Szeszák, Bence Márk, György Juhász, Gusztáv Áron Sziki, Rita Nagyné Kondor, Tamás Sádor Sütő und Krisztián József Veszelszki. „Measuring The Rolling Resistance of Pneumobiles“. Műszaki Tudományos Közlemények 9, Nr. 1 (01.10.2018): 227–30. http://dx.doi.org/10.33894/mtk-2018.09.52.

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Abstract In this publication we present a vehicle dynamic model and the motion of equation for pneumobiles. One of the input parameters of the model is the rolling resistance coefficient of the tyres. The present publication describes the experimental setup and work in the course of which the above coefficient was measured and the effect of tyre pressure on rolling resistance was analysed. During the measurement, we examined the effect of tyre pressure on rolling resistance, including when the vehicle in unloaded and in loaded state.

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Ateshian, G. A., und H. Wang. „Rolling resistance of articular cartilage due to interstitial fluid flow“. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 211, Nr. 5 (01.05.1997): 419–24. http://dx.doi.org/10.1243/0954411971534548.

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A mechanism which may contribute to the frictional coefficient of diarthrodial joints is the rolling resistance due to hysteretic energy loss of viscoelastic cartilage resulting from interstitial fluid flow. The hypothesis of this study is that rolling resistance contributes significantly to the measured friction coefficient of articular cartilage. Due to the difficulty of testing this hypothesis experimentally, theoretical predictions of the rolling resistance are obtained using the solution for rolling contact of biphasic cylindrical cartilage layers [Ateshian and Wang (1)]. Over a range of rolling velocities, tissue properties and dimensions, it is found that the coefficient of rolling resistance μR varies in magnitude from 10−6 to 10−2; thus, it is generally negligible in comparison with experimental measurements of the cartilage friction coefficient (10−3-10−1) except, possibly, when the tissue is arthritic. Hence, the hypothesis of this study is rejected on the basis of these results.

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Pałasz, Bartłomiej, Konrad J. Waluś und Łukasz Warguła. „The determination of the rolling resistance coefficient of a passenger vehicle with the use of roller test bench method“. MATEC Web of Conferences 254 (2019): 04007. http://dx.doi.org/10.1051/matecconf/201925404007.

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Contemporary vehicle are designer to be eco-friendly. One of the factors limiting the energy consumption of driving processes is a low value of the rolling resistance coefficient. The rolling resistance depends on the construction features of a tire, exploitation conditions and the type of surface the car moves on. This article presents the results of experimental research of determining the rolling resistance coefficient with the use of laboratory method of roller test bench. The results presented here are a part of a wider research of determining the rolling resistance coefficient and the influence of research method on its value.

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Warguła, Łukasz, Mateusz Kukla und Bartosz Wieczorek. „Determination of the rolling resistance coefficient of pneumatic wheel systems“. AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 20, Nr. 1-2 (28.02.2019): 360–63. http://dx.doi.org/10.24136/atest.2019.066.

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The basic resistance during moving objects that are equipped with a circular system is rolling resistance. In objects powered by muscle power, such as: bicycles, wheelchairs, mobile machines, shelves and storage trolleys, the problem of rolling resistance limitation is more important than in the case of structures powered by engines characterized by a significant excess of driving force relative to the sum of resistance forces. Research is being carried out on limiting the rolling resistance force, however, there is a lack of methods for measuring this parameter in the actual operating conditions of devices with a drive system without a drive unit. In the article for research, an innovative method was used of measuring the rolling resistance coefficient of objects equipped only with the rolling chassis of accordance with the patent application P.424484 and a test device compatible with the patent application P.424483. The study involved a pneumatic wheel commonly used in wheelchairs, the use of which gains popularity with increased interest in the construction of electric or diesel vehicles with low energy demand. Examples of such vehicles are available during the Shell Eco-marathon competition. The study was financed from the means of the National Centre for Research and Development under LIDER VII programme, research project no. LIDER/7/0025/L-7/15/NCBR/2016.

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Soica, Adrian, Adrian Budala, Vlad Monescu, Slawomir Sommer und Wojciech Owczarzak. „Method of estimating the rolling resistance coefficient of vehicle tyre using the roller dynamometer“. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, Nr. 13 (03.06.2020): 3194–204. http://dx.doi.org/10.1177/0954407020919546.

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The tendency in the past few years has been to introduce tyres with lower rolling resistance coefficients to the market. This paper presents a mathematical method for determining the rolling resistance coefficients variation depending on the speed. The method uses power balance which results from automobile dynamics while rolling on chassis dynamometer. The rolling resistance coefficients of tyres obtained through ‘drum test method’, for which the rolling resistance coefficients variation is known in terms of vehicle speed, are considered as reference values, while than rolling resistance coefficients of tyres obtained through ‘MAHA roller dynamometer’ using the recorded lost drag power in the roll-out phase on the stand are considered as tested values. The rolling resistance coefficients variation could be determined up to the maximum permissible speed of the tyre, for all wheels trained on the stand and not just for one tyre, as determined in laboratory conditions. The test conditions are similar to those in real road conditions, where the temperature of the environment and wheels cannot be controlled. The values obtained by the authors’ proposed method were compared with the values obtained by the ‘drum test method’. The main contribution of the proposed method is to estimate the rolling resistance coefficients without using a very expensive test facility.

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Srirangam, Santosh K., Kumar Anupam, Cor Kasbergen, Athanasios Scarpas und Veronique Cerezo. „Study of Influence of Operating Parameters on Braking Friction and Rolling Resistance“. Transportation Research Record: Journal of the Transportation Research Board 2525, Nr. 1 (Januar 2015): 79–90. http://dx.doi.org/10.3141/2525-09.

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Tire–road interaction addresses safety with respect to braking friction and energy efficiency in the context of rolling resistance. These phenomena are coherent, but their engineering solutions can be contradictory. For example, highly skid-resistant surfaces may not be ideal for fuel economy, but surfaces with low rolling resistance may be prone to skidding. Several experimental and numerical studies have investigated the individual phenomena, but insufficient attention has been paid to studying them coherently. The present study computed braking friction and rolling resistance for various operating parameters and their coherent response for each parameter with the use of a thermomechanical contact algorithm. Micromechanical finite element simulations of a rolling or braking pneumatic tire against selected asphalt concrete surfaces were performed for various operating conditions, such as tire load, inflation pressure, speed, and ambient air and pavement temperatures. The coefficients of braking friction and rolling resistance were found to decrease with the inflation pressure and the temperature and to increase with the wheel load. The braking friction coefficient was found to decrease with the speed, in contrast to the rolling resistance coefficient, which increases with the same parameter. A full-skidding tire registered lower braking friction than a 20% slipping tire. Also, an asphalt surface with higher macrotexture offered higher braking friction and higher rolling resistance, and vice versa.

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Pałasz, Bartłomiej, Konrad J. Waluś und Łukasz Warguła. „The determination of the rolling resistance coefficient of a passenger vehicle with the use of selected road tests methods“. MATEC Web of Conferences 254 (2019): 04006. http://dx.doi.org/10.1051/matecconf/201925404006.

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Wide range of laboratory and road methods of determining the rolling resistance coefficient impose the need to find an effective way of its estimation. The obtained values of this coefficient differ depending from the assumed calculation model and influence the quality and quantity assessment of cooperation processes between tire and surface. The article presents two experimental methods of determining the rolling resistance coefficient. Road tests were carried out with the use of coast-down and free-rolling method. For each of the road methods the value of the rolling resistance coefficient was determined in three ways. It allowed to compare the selected research methods and calculation methods with the values available in literature.

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Baldissera, Paolo, und Cristiana Delprete. „Rolling resistance, vertical load and optimal number of wheels in human-powered vehicle design“. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 231, Nr. 1 (01.08.2016): 33–42. http://dx.doi.org/10.1177/1754337115625002.

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Even if it makes a smaller contribution than aerodynamic drag, rolling resistance plays a non-negligible role in the efficiency of human-powered vehicles, whether they are designed for daily commuting or to set speed records. The literature, experimental evidence and models show that the rolling resistance coefficient of cycling wheels strongly depends on the supported load, suggesting that the number of wheels and the load distribution could play a role in vehicle design and in road-test data analysis. Starting with an in-depth look at the relationship between a single wheel and overall vehicle rolling resistance coefficients, an analysis is proposed and discussed with the aim of minimizing the rolling resistance of a vehicle. Finally, a parametric surface response model for rolling resistance is obtained as a function of wheel size and the number of wheels. The overall analysis overturns the popular assumption according to which ‘the more wheels, the more rolling resistance’, at least according to a strict definition of the phenomenon.

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Tieu, A. Kiet, Hong Tao Zhu, Cheng Lu, C. You, Zheng Yi Jiang und Giovanni D'Alessio. „Modelling of Friction Coefficient in Cold Strip Rolling“. Materials Science Forum 505-507 (Januar 2006): 1285–90. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.1285.

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The variation of the friction in the roll bite is of great importance in cold strip rolling. The main interest of the paper is to model the friction coefficient in the roll bite during cold rolling. The deformation resistance of the rolled products and friction coefficient in the roll bite were determined simultaneously by minimizing the error of the measured and calculated rolling forces based on nonlinear least squares optimization algorithm. The neural network was introduced to further improve the accuracy of friction coefficient calculation in cold strip rolling. The results already obtained shows that friction decreases with roll wear, and the lower the rolling speed, the higher is the friction.

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Warguła, Łukasz, Bartosz Wieczorek und Mateusz Kukla. „The selection of the tail lift parameters“. AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 20, Nr. 1-2 (28.02.2019): 364–67. http://dx.doi.org/10.24136/atest.2019.067.

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People moving on wheelchairs overcome the forces of resistance such as: air resistance, resistance of the ascent, inertia force and rolling resistance force. Under certain conditions of use of the wheelchair, the only resistance that must overcome the driving force during the movement is the rolling resistance force. This situation occurs during uniformly rectilinear movement, on a flat level surface at speeds of up to 20 km/h, because at this speed the air resistance is negligible. Rolling resistance is mainly influenced by the mass of the rolling object and the rolling resistance coefficient of the running gear. The value of the rolling resistance coefficient can be influenced, among others, by the surface, type and level of pressure in the tire, and the measurement method. There are test methods that in the resistance of rolling beyond the resistance resulting from the contact of the tire with the surface take into account the resistance to connection of the wheel with the driven object. One of them is the innovative method of measuring the rolling resistance coefficient of objects equipped only with the running gear according to the patent application P.424484 and the developed device for these tests in accordance with the patent application P.424483. The article presents the results of wheelchair rolling resistance test with a classic drive system and wheel attachment. These results show differences in the aspect of rolling resistance of classic wheelchairs with wheelchairs equipped with innovative propulsion solutions, such as a lever drive system or a hybrid drive. The study was financed from the means of the National Centre for Research and Development under LIDER VII programme, re-search project no. LIDER/7/0025/L-7/15/NCBR/2016.

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Rykov, S. P., V. N. Tarasuyk, V. S. Koval, N. I. Ovchinnikova, A. I. Fedotov und K. V. Fedotov. „Determination of rolling resistance coefficient based on normal tyre stiffness“. IOP Conference Series: Materials Science and Engineering 327 (März 2018): 042093. http://dx.doi.org/10.1088/1757-899x/327/4/042093.

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Ketterhagen, William R., Rahul Bharadwaj und Bruno C. Hancock. „The coefficient of rolling resistance (CoRR) of some pharmaceutical tablets“. International Journal of Pharmaceutics 392, Nr. 1-2 (15.06.2010): 107–10. http://dx.doi.org/10.1016/j.ijpharm.2010.03.039.

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Bulgakov, Volodymyr, Semjons Ivanovs, Volodymyr Kuvachоv und Dmytro Prysiazhniuk. „Investigation of the Influence of Permanent Traffic Lane Properties on Rolling of Bridge Agricultural Equipment Wheels“. Acta Technologica Agriculturae 24, Nr. 2 (21.05.2021): 97–102. http://dx.doi.org/10.2478/ata-2021-0016.

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Abstract Movement of bridge agricultural equipment along the permanent traffic lanes is characterised by significant energy costs for overcoming the rolling resistance forces. Until now, the movement process of bridge agricultural equipment wheels along the compacted soil of permanent traffic lanes has been paid only a little attention. It has been established that the physical and mechanical properties of soil lanes significantly affect the energy consumption necessary for overcoming the rolling resistance of forces of bridge agricultural equipment wheels. Considering the range of possible changes in these properties, the coefficient of rolling resistance of equipment wheels varies from 0.06 to 0.1, which is 66%. In order to reduce the rolling resistance coefficient of equipment wheels when moving along the permanent traffic lanes, the surface needs to be undeformable. When moving along such a solid and dense supporting surface, the wheel rolling resistance is lowest.

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Wargula, Łukasz, Bartosz Wieczorek und Mateusz Kukla. „The determination of the rolling resistance coefficient of objects equipped with the wheels and suspension system – results of preliminary tests“. MATEC Web of Conferences 254 (2019): 01005. http://dx.doi.org/10.1051/matecconf/201925401005.

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Rolling resistance coefficient is one of the basic resistance when moving objects. In case of objects not equipped with a motor-driven wheels and suspension system , such as: wheelchairs, mobile machinery chopper, shelving and warehouse trucks all resistances are overcome by the muscle strength of the operator. Research is carried out to limit this phenomenon, however, there is a lack of methods for measuring this parameter in the real operating conditions of devices with a wheels and suspension system without a drive unit. The article presents an innovative method of measuring the rolling resistance coefficient of objects equipped only with the wheels and suspension system accordant with the patent application P.424484 and the developed device for these tests in accordance with patent application P.424483. Additionally, the paper presents the results of preliminary tests on the measurement of pivoting coefficient of a transport truck loaded with a given mass.

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Bradley, Calvin R., und Arnaud Delaval. „On-Road Fuel Consumption Testing to Determine the Sensitivity Coefficient Relating Changes in Fuel Consumption to Changes in Tire Rolling Resistance“. Tire Science and Technology 41, Nr. 1 (01.02.2013): 2–20. http://dx.doi.org/10.2346/tire.13.410101.

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ABSTRACT: Tire rolling resistance is one of the primary forces opposing motion on passenger vehicles. New regulations appearing around the world will provide information on tire rolling resistance to consumers. The linear relationship between fuel savings and rolling resistance has been previously demonstrated. Extensive testing in real-world driving conditions has validated previous models. The result is a measured sensitivity coefficient for North American usage, which relates the changes in vehicle fuel consumption of E10 gasoline to changes in rolling resistance. This sensitivity coefficient is shown to not be significantly different between a compact car, a medium-sized sedan, and a full-sized pickup truck. Results provide a simple and robust way for end consumers to predict the impact of tire choice on their fuel consumption and CO2 emissions using tire label information.

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Bu, He Nan, Zhu Wen Yan, Cheng Ming Zhang und Dian Hua Zhang. „Comprehensive Parameters Adaption of Rolling Force Model Based on Objective Function in Tandem Cold Mill“. Applied Mechanics and Materials 551 (Mai 2014): 296–301. http://dx.doi.org/10.4028/www.scientific.net/amm.551.296.

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In order to improve the setting accuracy of rolling force model, a comprehensive parameters adaptive objective function of rolling force was established. During the adaptive process, the adaptive coefficients of friction coefficient and deformation resistance were taken as the optimized parameters, and the Rosenbrock algorithm was used to search the optimal solution of the objective function. The proposed adaptive method has been applied successfully to a 1450mm 5-stand tandem cold mill. Application results show that the forecast accuracy of rolling force model has been improved significantly.

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Patzer, Gregor, Mathias Woydt, Raj Shah, Curtis Miller und Philip Iaccarino. „Test Modes for Establishing the Tribological Profile under Slip-Rolling“. Lubricants 8, Nr. 5 (25.05.2020): 59. http://dx.doi.org/10.3390/lubricants8050059.

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The complex nature of slip-rolling contacts in many applications such as gear tooth flanks, rolling bearings, and heavy machinery often makes determining the friction and wear properties, as well as the fatigue resistance, of tribosystems difficult. The establishment of the tribological profile of a tribocouple under high Hertzian contact pressure and under slip-rolling will allow for the measurement and comparison of friction and wear coefficients as well as slip-rolling resistance by continuously monitoring the wear rate, coefficient of friction, temperature, oil film thickness, and/or electrical contact resistance using high-resolution signal analysis (HRA). A twin disc system can provide insight into the adhesive behavior of material and lubricant products such as alternative base oils and additives, ceramics, alloys, and thin film coatings. The strength and endurance of these products are often characterized through fatigue and resistance tests, which apply high Hertzian contact pressures to the rolling contact until seizure or failure is obtained. The further observation of the formation of tribofilms on the surface of contact yields information about the reactivity and thermochemical properties of additives. This review aims to illustrate how the implementation of different screening methodologies can be used as a meaningful tool for assessing the aforementioned tribological profile properties for the development of slip-rolling tribosystems.

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Hao, S., und L. M. Keer. „Rolling Contact Between Rigid Cylinder and Semi-Infinite Elastic Body With Sliding and Adhesion“. Journal of Tribology 129, Nr. 3 (22.01.2007): 481–94. http://dx.doi.org/10.1115/1.2736431.

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Based on a hybrid superposition of an indentation contact and a rolling contact an analytical procedure is developed to evaluate the effects of surface adhesion during steady-state rolling contact, whereby two analytic solutions have been obtained. The first solution is a Hertz-type rolling contact between a rigid cylinder and a plane strain semi-infinite elastic substrate with finite adhesion, which is a JKR-type rolling contact but without singular adhesive traction at the edges of the contact zone. The second solution is of a rolling contact with JKR singular adhesive traction. The theoretical solution indicates that, when surface adhesion exists, the friction resistance can be significant provided the external normal force is small. In addition to the conventional friction coefficient, the ratio between friction resistance force and normal force, this paper suggests an “adhesion friction coefficient” which is defined as the ratio between friction resistance force and the sum of the normal force and a function of maximum adhesive traction per unit area, elastic constant of the substrate, and contact area that is characterized by the curvature of the roller surface.

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Bulgakov, Volodymyr, Aivars Aboltins, Hristo Beloev, Volodymyr Nadykto, Volodymyr Kyurchev, Valerii Adamchuk und Viktor Kaminskiy. „Maximum Admissible Slip of Tractor Wheels without Disturbing the Soil Structure“. Applied Sciences 11, Nr. 15 (27.07.2021): 6893. http://dx.doi.org/10.3390/app11156893.

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One of the most important parameters that characterize the traction-coupling properties of a wheeled tractor is its slip. The more tractor’s gross traction exists, the higher its traction-coupling properties are. However, this gross traction should not exceed its maximum possible value, which, in turn out, is to be determined by the maximum permissible slip, δmax. This article provides the equation to calculate this crucial parameter and establishes the dependencies between the tractor’s slip and soil structure coefficient. It was shown that the value of δmax basically depends on such soil characteristics as the bulk deformation coefficient and the coefficient of rolling resistance. Calculations showed that, for the average value of the soil bulk deformation coefficient at 4000 kN·m−3, the average value of rolling resistance coefficient at 0.16, and the ratio value of the maximum permissible soil pressure to the tractor wheel rolling radius at 222 kPa·m−1, the maximum permitted amount slip of the tractor wheels should not exceed 15%. With more slip, the soil structure deteriorates significantly. In this case, its structure coefficient may be less than critical, equal to 0.4.

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Klimenko, Valery, Serhii Shuklinov, Dmytro Leontiev und Anton Gubin. „Analysing the methods for determining coefficient of resistance to car wheels rolling“. Automobile Transport, Nr. 46 (03.07.2020): 33. http://dx.doi.org/10.30977/at.2219-8342.2020.46.0.33.

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Gao, Xueliang, Ye Zhuang und Shu Liu. „High-speed 3D digital image correlation for measuring tire rolling resistance coefficient“. Measurement 171 (Februar 2021): 108830. http://dx.doi.org/10.1016/j.measurement.2020.108830.

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Warguła, Ł., M. Kukla und B. Wieczorek. „The impact of wheelchairs driving support systems on the rolling resistance coefficient“. IOP Conference Series: Materials Science and Engineering 776 (02.04.2020): 012076. http://dx.doi.org/10.1088/1757-899x/776/1/012076.

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Guzman, Leno J., Ying Chen und Hubert Landry. „Discrete Element Modeling of Seed Metering as Affected by Roller Speed and Damping Coefficient“. Transactions of the ASABE 63, Nr. 1 (2020): 189–98. http://dx.doi.org/10.13031/trans.13152.

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Abstract. The development of highly efficient seed metering is required to meet the demands of modern seeding equipment. The discrete element method (DEM) was used to simulate metering of seeds with a fluted roller meter. This approach was chosen due to its capability to accurately represent granular material flow. The contact model selected for the DEM simulation was the linear rolling resistance model. Angle of repose experimental tests and simulations were performed to calibrate the rolling friction coefficient for peas. The calibrated value for the rolling friction coefficient was 0.016. A 192 mm cross-section of an air cart seed roller and housing was defined as the domain of the simulation. Sensitivity analysis showed that simulated mass flow rates were not sensitive to the selected damping coefficients (0.2, 0.5, and 0.8). Sensitivity indicator values varied between -0.049 and 0.088 for the range of damping coefficients and roller speeds studied. The simulated geometry of the seed meter and housing resulted in a steady flow of seeds, with discharged mass increasing linearly. The simulated mass flow rates were 34.0, 72.3, 110.4, 147.3, and 182.0 g s-1 for roller speeds of 10, 20, 30, 40, and 50 rpm, respectively. An experiment was performed to validate the simulation results. The predicted mass flow rate values of the simulation were within 10 g s-1 of the experimental results, with the largest relative error being 16.5%. Keywords: DEM, Damping, Metering, Peas, Rolling friction coefficient, Seed, Simulation.

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Halama, Radim, Jiří Podešva, Ryosuke Suzuki, Masaaki Matsubara und Rostislav Čech. „Mechanics of Herbert Pendulum Hardness Tester and its Application“. Key Engineering Materials 741 (Juni 2017): 122–27. http://dx.doi.org/10.4028/www.scientific.net/kem.741.122.

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The knowledge of classical mechanics gives deeper insight into the Herbert hardness tester applicability for material testing. Elastic materials with low friction presence between contact surfaces are supposed to be investigated in this study. Firstly the dynamics approach is used to obtain simplified solution of swing angle. Then a new solution of the problem is gained by means of an energy approach. Slight decrease of the swing angle is predicted by the new solution as also shown in experiments. After comparison of both solutions a new formulae useful for evaluation of rolling resistance coefficient is applied for measurements performed on some metallic materials and artificial sapphire. Rolling resistance coefficients obtained by the way are always less than maximal estimated value.

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Yan, B. H., Han Yang Gu, Y. H. Yang und L. Yu. „CFD Analysis of Turbulent Flow in Typical Rod Bundles in Rolling Motion“. Applied Mechanics and Materials 29-32 (August 2010): 716–24. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.716.

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The influence mechanism of rolling motion on the flowing and heat transfer characteristics of turbulent flow in typical four rod bundles is investigated with FLUENT code. The flowing and heat transfer characteristics of turbulent flow in rod bundles can be affected by rolling motion. But the flowing similarity of turbulent flow in adiabatic and non-adiabatic can not be affected. If the rolling amplitude is big or if the rolling period is small, the radial additional force can make the parameter profiles and the turbulent flowing and heat transfer change greatly. And the frictional resistance coefficient and heat transfer coefficient can not be solved by the correlations in steady state. In rolling motion, as the pitch to diameter ratio decrease, especially if it is less than 1.1, the flowing and heat transfer of turbulent flow in rolling motion change significantly.

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Hutomo, Aditya Krisna, Dedy Dwi Laksana und Fx Kristianta. „PENGARUH PERMUKAAN ALUR KEMBANG (TREAD PATTERN) BAN TYPE RADIAL PLY TERHADAP ROLLING RESISTANCE“. ROTOR 10, Nr. 1 (01.04.2017): 51. http://dx.doi.org/10.19184/rotor.v10i1.5148.

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Rolling Resistance is a resistance to the wheels that will and have been rolling due to the force of friction between the wheels with the road surface of the wheel. Rolling resistance is influenced by four factors, that is vehicle weight, road surface, transmission, and tires. This study usefull to determine the influence of tread pattern surface to force and coefficient rolling resistance, tire surface contact area and tire pressure value. In this study using motorcycle tires with size 90/90-17. The tire used is a tire with RIB tread pattern (straight groove) and LUG tread pattern (zig-zag groove). Each type of RIB and LUG tread pattern used each of two tires that is the type of simple tread pattern and the complex tread pattern. From the results of the study showed that the tire with a simple tread pattern will produce a small force of rolling resistance but will result in a larger surface tire surface contact than the tire with the complex tread pattenr. While for the tire with the type complex tread pattern has a greater pressure value that will produce a great rolling resistance force. For tires get the best rolling resistance force is the tire with a simple LUG tread pattern of 10.234 N and followed by a tire with a simple RIB tread pattern type of 10.563 N. Keywords: tread pattern, rolling resistance, rib, lug.

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Trzepiecinski, Kubit, Slota und Fejkiel. „An Experimental Study of the Frictional Properties of Steel Sheets Using the Drawbead Simulator Test“. Materials 12, Nr. 24 (04.12.2019): 4037. http://dx.doi.org/10.3390/ma12244037.

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This article presents the results of an experimental investigation of the frictional resistance arising in a drawbead during sheet metal forming. The frictional characterization of DC04 deep drawing quality steels commonly used in the automotive industry is carried out using a friction simulator. The effects of some parameters of the friction process on the value of the coefficient of friction have been considered in the experimental investigations. The friction tests have been conducted on different strip specimens, lubrication conditions, heights of drawbead and specimen orientations in relation to the sheet rolling direction. The results of drawbead simulator tests demonstrate the relationship that the value of the coefficient of friction of the test sheets without lubrication is higher than in the case of lubricated sheets. The lubricant reduces the coefficient of friction, but the effectiveness of its reduction depends on the drawbead height and lubrication conditions. Moreover, the effectiveness of the reduction of the coefficient of friction by the lubricant depends on the specimen orientation according to the sheet rolling direction. In the drawbead test, the specimens oriented along the rolling direction demonstrate a higher value of coefficient of friction when compared to the samples cut transverse to the rolling direction. The smaller the width of the specimen, the lower the coefficient of friction observed. The difference in the coefficient of friction for the extreme values of the widths of the specimens was about 0.03–0.05. The use of machine oil reduced the coefficient of friction by 0.02–0.03 over the whole range of drawbead heights. Heavy duty lubricant even reduced the frictional resistances by over 50% compared to dry friction conditions. The effectiveness of friction reduction by machine oil does not exceed 30%.

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El Gindy, Moustafa, Mirwais Sharifi, Zeinab El Sayegh und Fatemeh Gheshlaghi. „Prediction and validation of terramechanics models for estimation of tyre rolling resistance coefficient“. International Journal of Vehicle Systems Modelling and Testing 14, Nr. 1 (2020): 71. http://dx.doi.org/10.1504/ijvsmt.2020.10030673.

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Gheshlaghi, Fatemeh, Zeinab El Sayegh, Mirwais Sharifi und Moustafa El Gindy. „Prediction and validation of terramechanics models for estimation of tyre rolling resistance coefficient“. International Journal of Vehicle Systems Modelling and Testing 14, Nr. 1 (2020): 71. http://dx.doi.org/10.1504/ijvsmt.2020.108658.

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34

Szántó, András, und Sándor Hajdu. „Parameter Estimation of Drag Coefficient and Rolling Resistance of Vehicles Based on GPS Speed Data“. International Journal of Engineering and Management Sciences 5, Nr. 2 (15.04.2020): 109–15. http://dx.doi.org/10.21791/ijems.2020.2.14.

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In this paper, a parameter estimation method of the model-based design approach is applied to estimate the drag coefficient and the rolling resistance coefficient of a vehicle. In fact, a constant-force parameter (c_const) and a velocity-square-force parameter (c_square) are in the vehicle model, and these result in the sum force applied along the translational DOF that models the vehicle. It is only an assumption that the constant force is the rolling resistance and the force proportional to the square of the velocity is the drag force of the air. Only GPS speed data is used for the estimation process. The conclusion is that parameter estimation is a good alternative when expensive measurement devices are not available to measure the force losses separately and directly.

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Хафизов, Камиль, Kamil Khafizov, Рамиль Хафизов, Ramil Khafizov, Азат Нурмиев, Azat Nurmiev, Ильгиз Галиев und Ilgiz Galiev. „THEORETICAL BACKGROUND OF CREATING A MATHEMATICAL MODEL OF TRACTOR TRACTION EFFICIENCY“. Vestnik of Kazan State Agrarian University 14, Nr. 3 (30.10.2019): 116–21. http://dx.doi.org/10.12737/article_5db9748fc053c2.28431294.

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To identify the main parameters of the tractor - its mass, engine power, wheel diameter and its profile width (four-parameter optimization) using the optimization criterion - the total energy costs (taking into account the energy of the crop lost due to the non-optimality of these parameters), it is necessary to have a mathematical model for calculation of engine power through the traction coefficient of performance of the tractor. The traction efficiency of the tractor is calculated through f is the coefficient of resistance to rolling of the tractor wheel and d is the coefficient of slipping of the tractor wheel. An analysis of the applied theory developed by previous researchers showed that the values f and d depend on the weight of the tractor coming to one wheel G, the diameter D and the width of the profile of the wheel B, the pressure in its tires ρw, the hardness of the soil H, the effort on the tractor hook Pkp and its speed V. During the analysis, it was found that the larger the diameter of the wheel, the width of the tire profile, the less the vertical load on the wheel and the pressure in the tires, the less the resistance to rolling the wheel over the soil being compacted. It is concluded that the study of the nature of the change in the coefficient of resistance to rolling wheels f and their slipping d from the above factors must be carried out jointly, because they influence each other. The absence of acceptable mathematical dependences for calculating the indicated coefficients, with the simultaneous action of all identified factors, leads to the need for a seven-factor experiment to identify the dependencies f =j (G, D, b, ρw, H, Ркр, V) and δ =ψ (G, D, b, ρw, H, Ркр, V), which is very difficult in operating conditions, therefore, using the similarity theory, it is necessary to reduce the number of factors in the experiment to four.

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Мarmut, Igor, Vitalii Kashkanov und Volodymyr Zuiev. „Experimental study of the rolling resistance of car wheels on a roller stand“. Journal of Mechanical Engineering and Transport 12, Nr. 2 (Februar 2021): 68–75. http://dx.doi.org/10.31649/2413-4503-2020-12-2-68-75.

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The article considers the results of experimental studies of the rolling resistance of car wheels on a roller stand. Also, the dependence of the coefficient of total resistances during wheel rolling on the stand rollers on the speed was established. Monitoring and diagnosing the technical condition of the rolling stock of vehicles from the point of view of traffic safety is one of the most important problems. This control is especially important for systems whose technical condition affects traffic safety, first of all, brake systems, as well as the power unit in the traction test mode. Foreign and domestic experience testifies to the effectiveness of instrumental control. Its advantages lie in the reliability of the values of the checked parameters. The diagnostic equipment includes roller stands, on which you can check the braking and traction properties of cars. As shown by many studies, in particular, carried out at the Department of Technical Operation and Service of Automobiles, KhNADU (HADI), inertial stands provide more reliable information about the technical condition of the car. The inertial test method allows you to reproduce real speed and thermal modes of operation. To improve the accuracy of diagnosing a car on a roller stand, it is necessary to have an idea of the nature of the interaction of the car wheels with the stand rollers. Studies of wheel rolling on the stand rollers have been carried out by many authors since the 70s of the last century. However, all of these studies were conducted on old bias tires. Now, only radial tires are used on passenger cars, the rolling resistance of which on rollers has practically not been studied. Therefore, returning to the study of this issue is relevant. The rolling resistance of wheels on the rollers of the stand will significantly affect the nature of their interaction during long-term running tests (due to increased heating of contacting bodies, power losses, violation of similarity conditions, etc.). It was found that the value of the rolling resistance coefficient noticeably depends on the ratio of the radii of the roller and the wheel, as well as the contact load, that is, the radial force of pressing the wheel against the roller, and in addition, on the speed and duration of the mode. The obtained results of the experiment made it possible to improve the theory of the interaction of a car wheel with the rollers of an inertial diagnostic stand. Also, the results of the experiments can be extended to different types of tires and the ratio of the radii of the wheel and roller.

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She, Dingshun, Shihao Liu, Jiajie Kang, Wen Yue, Lina Zhu, Chengbiao Wang, Haidou Wang, Guozheng Ma und Li Zhong. „Abrasive Wear Resistance of Plasma-Nitrided Ti Enhanced by Ultrasonic Surface Rolling Processing Pre-Treatment“. Materials 12, Nr. 19 (06.10.2019): 3260. http://dx.doi.org/10.3390/ma12193260.

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The objective of the given work was to investigate abrasive wear behaviours of titanium (Ti) treated by ultrasonic surface rolling processing (USRP) pre-treatment and plasma nitriding (PN). Simulated lunar regolith particles (SLRPs) were employed as abrasive materials during characterization of tribological performances. The experimental results showed that SLRPs cause severe abrasive wear on Ti plasma-nitrided at 750 °C via the mechanism of micro-cutting. Due to the formation of a harder and thicker nitriding layer, the abrasive wear resistance of the Ti plasma-nitrided at 850 °C was enhanced, and its wear mechanism was mainly fatigue. USRP pre-treatment was effective at enhancing the abrasive wear resistance of plasma-nitrided Ti, due to the enhancement of the hardness and thickness of the nitride layer. Nevertheless, SLRPs significantly decreased the friction coefficient of Ti treated by USRP pre-treatment and PN, because the rolling of small granular abrasives impeded the adhesion of the worn surface. Furthermore, USRP pre-treatment also caused the formation of a dimpled surface with a large number of micropores which can hold wear debris during tribo-tests, and finally, polishing and rolling the wear debris resulted in a low friction coefficient (about 0.5).

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Bonhomme, J., und V. Mollón. „A Method to Determine the Rolling Resistance Coefficient by Means of Uniaxial Testing Machines“. Experimental Techniques 39, Nr. 3 (04.04.2013): 37–41. http://dx.doi.org/10.1111/ext.12023.

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Wiratkasem, Kengkamon, und Somchai Pattana. „The effect of motorcycle tyre rolling resistance coefficient on the saving of fuel consumption“. Energy Reports 7 (September 2021): 248–52. http://dx.doi.org/10.1016/j.egyr.2021.06.042.

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Устинов und Vladimir Ustinov. „Experimental study of forest soil resistance to cone penetration“. Forestry Engineering Journal 6, Nr. 3 (10.10.2016): 188–96. http://dx.doi.org/10.12737/21698.

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This article informs us about testing the theoretical dependence to calculate cone index re-garding the soil deformation module. Common methods of calculation tractive performance of wheeled mover do not allow to analyze the influence of the geometric parameters of wheeled mover,inner tire pressure, slip ratio, wheel load, as well as the physical and mechanical properties of forest soil on rolling resistance, net thrust and drawbar pull coefficient in complex.

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Shi, Xiao Chen, Masatoshi Ando, Yuji Kashima und Katsuyuki Kida. „Crack Observation of PPS Polymer Thrust Bearings under RCF Test in Water“. Key Engineering Materials 703 (August 2016): 178–82. http://dx.doi.org/10.4028/www.scientific.net/kem.703.178.

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Polymer bearings are widely used under certain environments due to the advantages on light weight, low friction coefficient, high corrosion resistance and electric insulation. The main reason for polymer bearing failures in water was formation of flakings due to crack propagation. However, the mechanism of fatigue crack propagation in polymer material under rolling contact condition has not been clearly explained yet. In the present study, detailed crack observations were made on cross sections along both radial and rolling directions after RCF (Rolling Contact Fatigue) test in water using PPS thrust bearings.

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El-Sayegh, Zeinab, und Moustafa El-Gindy. „Modelling and prediction of tyre–snow interaction using finite element analysis–smoothed particle hydrodynamics techniques“. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, Nr. 7 (30.07.2018): 1783–92. http://dx.doi.org/10.1177/0954407018788997.

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This paper focuses on the modelling and prediction of truck tyre–snow interaction to compute tyre motion resistance coefficient. The off-road truck tyre size 315/80R22.5 is modelled using finite element analysis and validated in static and dynamic response against published measured data. The snow is modelled using smoothed particle hydrodynamics technique and hydrodynamic-elastic-plastic material and then calibrated against physical measurements provided by published terramechanics data. The contact algorithm implemented is the node-symmetric node-to-segment contact with edge treatment. The rolling resistance coefficient is also known as the motion resistance coefficient of the truck tyre–snow interaction and is computed for several operating conditions including the vertical load, inflation pressure, tyre longitudinal speed, and snow depth. The influence of the above-mentioned operating conditions on the truck tyre motion resistance coefficient is examined and discussed.

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Zhao, Xiaoxia, Wenjun Meng und Lidong Zhou. „Research on Indentation Rolling Resistance Based on Viscoelasticity of Cover Rubber under a Conveyor Belt“. Mathematical Problems in Engineering 2019 (10.02.2019): 1–16. http://dx.doi.org/10.1155/2019/1781427.

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Minimizing the power consumption of the belt conveyor is the common wish of all enterprises and even countries. Among all the resistances generated by the belt conveyor during the operation, the indentation rolling resistance accounts for the largest proportion and the power consumed is the largest. Therefore, accurately predicting and reducing the rolling resistance of indentation is the focus of current research. Firstly, based on the three-element Maxwell solid model, the dynamic loading experiments of cylindrical rubber made of conveyor belt cover material were carried out at different temperatures. The identification models of elastic moduli E2 and E3 and viscosity coefficient η2 in the three-element Maxwell model were obtained, and then the fitting functions of the three parameters were gotten, which can intuitively reflect the influence of temperature. Secondly, the mathematical model of the indentation rolling resistance was derived. The mathematical model is characterized by the direct parameters such as belt speed v, thickness of backing material h, the idler radius R, and the rubber viscoelastic parameters E2, E3, and η2 and the indirect parameters such as normal force P and temperature T. Afterwards, the effects of belt speed, normal force, temperature, idler radius, and thickness of underlay on the indentation rolling resistance were studied under different working conditions. After that, experimental testing and analysis were fulfilled using test equipment and compared with theoretical analysis results. The results prove that the theoretical results are basically consistent with the experimental results, in line with the actual engineering rules. Finally, the application of the results in practical engineering was analyzed superficially.

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Jiao, Zhi Jie, Hao Zhang, Jing Wang, Chui Hong Liu und Xiang Hua Liu. „Precise Rolling Force Calculation for the Tandem Cold Mill“. Materials Science Forum 561-565 (Oktober 2007): 1883–86. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1883.

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Rolling force is the most important technical parameter for the tandem cold mill. In this paper, the precise models and calculation process for the rolling force are introduced. The rolling force model is based on the Bland-Ford and Hill theory, and the roll flatten radius is calculated with the Hitchcok’s formula. The deformation resistance of the strip is calculated with the model, whose parameters are decided according to the steel grade. The friction coefficient model is built according to rolling speed and rolled length of the roll. The rolling force and the roll flatten radius are calculated with the iterative method. These models are used for online process control of one five-stand tandem cold mill. Comparing the calculation result and the actual data, the precision of the rolling force calculation is high.

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Wang, Chang Sheng, Hai Xiong Wang, Ji Bin Li und Jiang Zhang. „Experiment on Hot Rolling Deformation Resistance of Aluminum Alloy and Mathematical Modeling“. Advanced Materials Research 314-316 (August 2011): 409–14. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.409.

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In order to investigate the impact factor of hot rolled aluminum alloy, a experiment was finished in a factory, to determine the effects of hot-rolled aluminum alloy plate with the system deformation resistance coefficient of the various factors and to mark the influence about the temperature to the hot rolling deformation resistance; Then, established the mathematical models of 1100,3003,5052 series hot rolled aluminum alloy plate's deformation resistance; The data calculated by the theoretical mathematical models is in good agreement the measured data. So this mathematical have the importance actual significance to actual production.

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Kawase, Tadahiro, Hiroyuki Shiozaki und Toshitaka Iwauchi. „Protection against Slippage between Roll and Material in the Rolling of Lumber“. Key Engineering Materials 340-341 (Juni 2007): 755–60. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.755.

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During lumber rolling, a fixation device is typically installed just behind the work roll to set up the delivery thickness and to fix the thickness reduction. However, the accompanying resistance force into the fixation device can cause slippage between the roll and material, indicating a bound for the rolling conditions. Slippage can be avoided by decreasing the resistance force or by adding a pushing force on the lumber from the entry side of the rolling mill. This paper experimentally investigated the effects of these horizontal forces on the rolling force and roll torque. From these results, the roll torque was found to be directly affected by the horizontal forces, but the rolling force was not affected. Secondly, a new parameter μeq was introduced and a condition of non-slippage, in which μeq must be less than the coefficient of static friction to avoid slippage, was proposed. This condition was then used to predict and to protect against slippage by identifying when this condition was violated and then applying a horizontal force to decrease μeq.

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Janulevičius, Algirdas, und Kazimieras Giedra. „THE SLIPPAGE OF THE DRIVING WHEELS OF A TRACTOR IN A CULTIVATED SOIL AND STUBBLE“. TRANSPORT 24, Nr. 1 (31.03.2009): 14–20. http://dx.doi.org/10.3846/1648-4142.2009.24.14-20.

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The article analyses the relation between the slippage of driving wheels and the traction characteristics of a tractor. The indicators for estimating wheel slippage are a coefficient of tractor weight force utilization for driving wheel grip and a coefficient of the ratio of trailer and tractor mass. The dependencies of wheel slippage on the weight utilization coefficient of tractors and the ratio of trailer and tractor mass are overviewed. The presented and carried out analysis of the equations of weight utilization coefficient ϕ g determined its dependencies on rolling resistance coefficients f of a means of transport, working speed v and acceleration aon the mass ratio of a trailer and tractor mp/mt . The results of experimental research on acceleration and constant speed regimes in a cultivated soil and stubble are presented. The dependencies of slippage on the ratio of trailer and tractor mass and the weight utilisation coefficient of a tractor and trailer are viewed.

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Chen, Ming, und Li Xin Guo. „The Parameters Sensitivity Analysis of Battery Electric Vehicle Energy Consumption Economy“. Advanced Materials Research 308-310 (August 2011): 1724–27. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1724.

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This paper establishes mathematical model of energy consumption economy for constant speed driving and acceleration driving. According to the model, influence degree calculation formulas of parameter sensitivity of vehicle mass, mechanical efficiency of transmission system, rolling resistance coefficient and air resistance factor to energy consumption economy are proposed, and analysis of energy consumption economy parameter sensitivity on a kind of BEV is conducted.

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Komnos, Dimitrios, Stijn Broekaert, Theodoros Grigoratos, Leonidas Ntziachristos und Georgios Fontaras. „In Use Determination of Aerodynamic and Rolling Resistances of Heavy-Duty Vehicles“. Sustainability 13, Nr. 2 (19.01.2021): 974. http://dx.doi.org/10.3390/su13020974.

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A vehicle’s air drag coefficient (Cd) and rolling resistance coefficient (RRC) have a significant impact on its fuel consumption. Consequently, these properties are required as input for the certification of the vehicle’s fuel consumption and Carbon Dioxide emissions, regardless of whether the certification is done via simulation or chassis dyno testing. They can be determined through dedicated measurements, such as a drum test for the tire’s rolling resistance coefficient and constant speed test (EU) or coast down test (US) for the body’s air Cd. In this paper, a methodology that allows determining the vehicle’s Cd·A (the product of Cd and frontal area of the vehicle) from on-road tests is presented. The possibility to measure these properties during an on-road test, without the need for a test track, enables third parties to verify the certified vehicle properties in order to preselect vehicle for further regulatory testing. On-road tests were performed with three heavy-duty vehicles, two lorries, and a coach, over different routes. Vehicles were instrumented with wheel torque sensors, wheel speed sensors, a GPS device, and a fuel flow sensor. Cd·A of each vehicle is determined from the test data with the proposed methodology and validated against their certified value. The methodology presents satisfactory repeatability with the error ranging from −21 to 5% and averaging approximately −6.8%. A sensitivity analysis demonstrates the possibility of using the tire energy efficiency label instead of the measured RRC to determine the air drag coefficient. Finally, on-road tests were simulated in the Vehicle Energy Consumption Calculation Tool with the obtained parameters, and the average difference in fuel consumption was found to be 2%.

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Lee, Beomho, Deokjin Kim, Jinwoo Lee, Woosub Cha und Youngho Seo. „Influence of Tire Rolling Resistance Coefficient on Road Load and Fuel Economy for Passenger Car“. Transaction of the Korean Society of Automotive Engineers 26, Nr. 6 (01.11.2018): 745–54. http://dx.doi.org/10.7467/ksae.2018.26.6.745.

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