A surface topography analysis of the curling stone curl mechanism

Honkanen, Viktor; Ovaska, Markus; Alava, Mikko J.; Laurson, Lasse; Tuononen, Ari J.

doi:10.1038/s41598-018-26595-y

Cited by 20 publications

(20 citation statements)

References 11 publications

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“…From then on, the debate seems to turn slowly into a scientific standstill even though many papers get published. Two follow-up papers of new authors [9] and [11] then neglected this approach and supported the idea of a scratch-based mechanism. However, two papers by the authors of the Pivot-Slide party [10] and [12] claimed to experimentally disprove these new findings.…”

Section: Previous Approachesmentioning

confidence: 99%

The Split Friction Model - Introducing Mixed Lubrication to Curling

Ziegler¹

2021

Preprint

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In general, the curling stone is subject to mixed lubrication, resulting in the characteristic Stribeck -curve. As velocity increases, the friction force falls quadratically just to rise linearly yet almost flat after the minimum. In the case of a rotating curling stone this results in a torque. Due to isotropy , the lateral force arises as a delta of asymmetric friction forces opposite to the centripetal forces. \par This in turn allows a split friction model that splits up the quadratic curve into two rather constant values for the friction force on the advancing and the retreating side below a critical velocity difference of these sides: the flee force on the advancing side must not exceed the normal force of the retreating side. Only then a curl can happen. This explains why a stone curls towards the end of the throw. \par Following basic static considerations, the stone may theoretically rest on up to three points during a throw. Each single static case is investigated. These results are discussed with additional heuristic calculations that involve Scratch-Theory. Lastly, the influence of gyroscopic precession yields a graph that reflects established experimental observations: A desired flat curve within deviations ranging from 0.80 to 1.02 meter for up to 20 rotations just to rise linearly up to 2 meters for 80 rotations.

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Section: Previous Approachesmentioning

confidence: 99%

The Split Friction Model - Introducing Mixed Lubrication to Curling

Ziegler¹

2021

Preprint

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“…The physics behind curling stone movement is still not fully described, and new models are being proposed. Recently proposed models include front-back asymmetry models (assuming an asymmetry of friction forces at the front and the back of a running curling stone) [3][4][5][6][7][8][9][10][11] and pivot-slide models (taking that the curling stone pivots around specific points in the ice during its movement) [12,13]. Currently, no model is widely accepted, and scientists' discussions about various models are still ongoing [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Acceleration-Based Method of Ice Quality Assessment in the Sport of Curling

Dzikowski

Weremczuk

Pachwicewicz³

2022

Sensors

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Despite the significant influence of ice conditions on results in the sport of curling, players and ice technicians lack a measurement device that would objectively measure ice quality during a curling competition. This paper presents such a new measurement method by using a device consisting an inertial measurement unit (IMU) attached to the handle of the curling stone and data processing software. IMU is used to measure the vibration of curling stone during its movement on the surface of the ice. The acceleration signal is recorded, and then the software calculates the value of so-called R parameter in frequency domain. The value of R allows one to determine if an ice sheet had been pebbled and if the shape of pebbles is suitable for the game of curling. The presented system was tested in various ice conditions—on both freshly prepared and used ice. Ice technicians and players may use the proposed system to decide whether the ice surface is suitable for play or if it should be remade.

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“…This paper appeared in the form of a self-published, unrefereed preprint on ReseachGate. 2 In recent work by Honkanen et al, 3 scratches have been generated and studied with a view towards supporting the scratch proposal. Scratches made by the front half of the rock (forward and to the right for clockwise rotation) were shown to be in the opposite sense to those generated by the back half (forward and to the left).…”

Section: Introductionmentioning

confidence: 99%

Null effect of scratches made by curling rocks

Shegelski

Lozowski

2019

Proceedings of the IMechE

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There is disagreement in the literature as to whether scratches made by curling rocks affect the motion of subsequent curling rocks. The aim of this investigation is to provide unequivocal experimental evidence to resolve this disagreement. Such evidence has been obtained by comparing the curl distances (total lateral deflections) of rocks sliding over ice with no scratches to curl distances of rocks sliding over ice completely covered with scratches made by previous curling rocks. The result of this simple experiment is that there is no appreciable difference in the curl distances between the two ice conditions. The conclusion is that the scratches made by curling rocks do not affect the motion of other curling rocks and that the lateral deflection of curling rocks cannot solely be due to scratches made by curling rocks.

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A surface topography analysis of the curling stone curl mechanism

Cited by 20 publications

References 11 publications

The Split Friction Model - Introducing Mixed Lubrication to Curling

The Split Friction Model - Introducing Mixed Lubrication to Curling

Acceleration-Based Method of Ice Quality Assessment in the Sport of Curling

Null effect of scratches made by curling rocks

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