[특허]Intrinsically-calibrated tribometer

Johnson, Fred M.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Intrinsically-calibrated tribometer

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-019/02
출원번호	US-0741083 (2015-06-16)
등록번호	US-9470619 (2016-10-18)
발명자 / 주소	Johnson, Fred M.
출원인 / 주소	Johnson, Fred M.
대리인 / 주소	WHGC, PLC
인용정보	피인용 횟수 : 0 인용 특허 : 14

초록
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Intrinsically calibrated friction mensuration device has a drive unit with controllable motive member, configured to receive a controllable propulsion force, and to apply tractive force by a Class 1 lever to a weighted test piece. A force engine couples to the motive member, and applies the controllable propulsion force. The device includes a controller imposing a propulsion control signal actuating the force engine to produce the propulsion force. A force sensor joins drive unit and test piece, producing a force signal responsive to a sensed force between drive unit and test piece. The sensed force includes hydroplaning SCOF and hydroplaning DCOF. A method includes applying an increasing tractive force to a test piece at rest; measuring the tractive force; identifying the maximum tractive force applied at incipient motion; identifying the transition between the resting test piece and incipient motion; determining the hydroplaning SCOF; continuing motion; and determining the hydroplaning DCOF.

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1. A friction mensuration device, comprising: a force engine configured to apply a controllable tractive force to a weighted test piece on a wetted, smooth test surface;a controller coupled to the force engine, and imposing a traction control signal to the force engine, the traction control signal actuating the force engine to produce the controllable tractive force;a force sensor coupled between a drive unit and the weighted test piece, the force sensor producing a force signal responsive to a sensed force between the force engine and the weighted test piece, the force sensor having a load cell therein;a Class 1 lever arm coupled between the force sensor and the weighted test piece, the Class 1 lever arm having a load arm coupled between the force engine and a fulcrum, and an effort arm coupled between the fulcrum and the weighted test piece,wherein a ratio of the effort arm length to the load arm length provides a predetermined force divider to the controllable tractive force applied to the weighted test piece,wherein the predetermined force divider applied to the controllable tractive force produces a predetermined divided controllable tractive force,wherein when predetermined divided controllable tractive force is applied to the weighted test piece on the test surface, a corresponding increase in weighted test piece speed is produced and the weighted test piece experiences a measurable hydroplaning on the test surface,wherein a sensed force measurement representative of stiction is discarded;wherein the drive unit is calibrated by measuring a directional force and a normal force with the same load cell, andwherein the force sensor produces a reproducible measurement of the sensed force, and wherein the measurement is absolute, traceable, and operator-independent. 2. The friction mensuration device of claim 1, further comprising: the weighted test piece having a preselected test material thereon,wherein the weighted test piece is oriented to place the preselected test material in contact with the test surface,wherein the weighted test piece receives the predetermined divided controllable tractive force,wherein the weighted test piece translates the predetermined divided controllable tractive force into a test force applied to the preselected material sample,wherein the test force applied to the preselected material sample is representative of a contact friction force between the preselected material sample and the test surface, andwherein the contact friction force is measurably reduced during hydroplaning of the weighted test piece on the surface. 3. The friction mensuration device of claim 1, wherein the preselected test material comprises one of a Neolite® rubber compound, a styrene butadiene rubber (SBR) compound, or an SBR compound sanded until smooth in one direction with 2000 grit sanding material. 4. The friction mensuration device of claim 1, wherein the drive unit is a stationary drive unit coupled to the weighted test piece. 5. The friction mensuration device of claim 1, wherein the sensed force is a static friction force related to hydroplaning. 6. The friction mensuration device of claim 1, wherein the sensed force is a dynamic friction force related to hydroplaning. 7. The friction mensuration device of claim 1, wherein, in response to a received force signal, the controller actuates the force engine to produce the predetermined divided controllable tractive force on test piece and, responsive thereto, imposes a contact friction force between the test surface and a preselected sample material that transitions into measurable hydroplaning on a wetted test surface. 8. The friction mensuration device of claim 1, further comprising: a mensuration memory coupled to the controller and having memory storage units,the mensuration memory being configured to receive from the controller a plurality of representations of the sensed force, andthe mensuration memory configured to retain respective ones of the plurality of representations of the sensed force. 9. The friction mensuration device of claim 1, wherein the weighted test piece is a contact sled further comprising: a carrier having a facet, wherein the facet includes a sample carrier thereon, the sample carrier being disposed to releasably retain a respective preselected material sample, andwherein the carrier can be disposed to position one of the preselected test materials in contact with the surface. 10. The friction mensuration device of claim 1, further comprising: the force engine applies the controllable tractive force during a first portion of a test period, corresponding to the static coefficient of friction of hydroplaning, or the force engine applies the controllable tractive force during a second portion of a test period, corresponding to the dynamic coefficient of friction of hydroplaning. 11. The friction mensuration device of claim 1, wherein the preselected sample material is a control sample material. 12. The friction mensuration device of claim 11, wherein the control sample material is a resin rubber constituent of a preselected rubber soling material. 13. A method of friction mensuration, comprising: applying aft predetermined divided controllable tractive force to a weighted test piece at rest on a wetter, smooth test surface at the beginning of a test period;measuring a sensed force on the weighted test piece at rest on a test surface during the test period;identifying a maximum sensed_force applied at incipient motion of the test piece on the test surface during the test period;discarding a sensed force measurement corresponding to stiction;determining a static coefficient of friction of the test piece relative to the test surface for the test period;measuring a sensed-force used to continue motion in the weighted test piece for the test period; andidentifying the maximum sensed-force applied at incipient motion of hydroplaning. 14. The method of friction mensuration of claim 13, further comprising: creating a test session from a plurality of sequential test periods. 15. The method of friction mensuration of claim 13, further comprising: stopping the test piece between selected test periods in the test session. 16. The method of friction mensuration of claim 13, further comprising: applying tractive force to the test piece during a calibration session;suspending the test piece separated from the test surface during the calibration session;andweighing the suspended test piece, wherein the weighing is a constituent of intrinsically calibrating a friction mensuration device. 17. The method of friction mensuration of claim 13, further comprising: continuing the tractive force during the test period;stopping the tractive force at the end of the test period;determining sensed forces created during the test period;determining the static coefficient of friction of the test piece relative to the test surface from at least one of the sensed forces; anddetermining a dynamic coefficient of friction of the test piece relative to the test surface from at least another one of the sensed forces. 18. The method of friction mensuration of claim 13, further comprising: applying tractive force to the weighted test piece during a calibration period;suspending the weighted test piece separated from the test surface during the calibration period; andweighing the suspended weighted test piece, wherein the weighing is a constituent of intrinsically calibrating a friction mensuration device. 19. The method of friction mensuration of claim 13, further comprising: measuring an absolute GPS location of a tribometer performing the friction mensuration. 20. The method of friction mensuration of claim 13, further comprising: generating a mensuration report including output data being disposed into a preprogrammed report template.

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Intrinsically-calibrated tribometer

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Intrinsically-calibrated tribometer

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