Method of determining pavement grip coefficient

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises measuring parameters of the pavement and calculating the grip coefficient. First, the ordinate of the micro-profile of pavement is measured, and then the dependence y = f(x), which describes the micro-profile in a given section, is determined. The dependence is used for determining the length of the curve of micro-profile, and parameters Ki of the pavement roughness are determined from the formulae proposed.

EFFECT: simplified method and reduced cost of determining.

2 dwg

 



 

Same patents:

FIELD: investigating or analyzing materials.

SUBSTANCE: device comprises housing, mechanism for loading, specimen holders that are provided with parallel bearing planes and mounted one opposite to the other. One of the holders cooperates with the loading mechanism. The mandrel provided with the spherical indenter is interposed between the specimen holders. The device has the mechanism for rotation of the indenter around its axis and unit for measuring the applied moment. The mechanism for rotation of the indenter is made of the lever secured to the mandrel, segment secured to the lever, and flexible link that embraces the segment and undergoes the load.

EFFECT: expanded functional capabilities.

1 dwg

FIELD: investigating or analysis of material.

SUBSTANCE: method comprises determining the limit value of the stress by measuring the angle of inclination of the surface which is provided with the initial material. The device comprises changeable coating with projections and locking member made of a frame having thin baffles or thin film made of an adhesive agent.

EFFECT: improved method.

2 cl, 3 dwg

FIELD: plastic metal working.

SUBSTANCE: method comprises calculating the stress-strain condition of the tool and blank with regard for their materials and geometry, plotting a diagram "deformation force - friction coefficient" of the process of plastic deformation, determining experimentally the deformation force, which corresponds to the actual condition of the surfaces of tool, blank, and lubricant, and determining friction coefficient from the diagram.

EFFECT: enhanced accuracy and reduced labor consumption for determining.

3 dwg

FIELD: measuring engineering.

SUBSTANCE: instrument has platform pivotally connected with the base, box without bottom filled with plastic material, tie-rod device, bearing member which can be adjusted in height with spacers and guides mounted on the plate. The layer of material comprises particles. The box is connected with the platform through a damping link provided with arresting carrier.

EFFECT: enhanced accuracy of measurements.

2 dwg

FIELD: tribometry.

SUBSTANCE: device has the platform which is provided with an article and set on rollers, drive for reciprocating, unit for loading articles, and pickups for recording forces and displacements .

EFFECT: enhanced accuracy of testing.

1 cl, 3 dwg

The invention relates to devices for investigating the mechanism of friction in nanotribology by modeling the interaction process needle atomic force microscope (AFM) with an atomically smooth surface of the sample in the measurement of lateral forces to render the sticking-sliding

The invention relates to devices for operational control of the friction wheel constructed and maintained roads with hard surface

The invention relates to methods of testing materials for friction

The invention relates to road construction, namely, devices for process control sealing pavement and grounds rollers static and vibratory actions

FIELD: tribometry.

SUBSTANCE: device has the platform which is provided with an article and set on rollers, drive for reciprocating, unit for loading articles, and pickups for recording forces and displacements .

EFFECT: enhanced accuracy of testing.

1 cl, 3 dwg

FIELD: measuring engineering.

SUBSTANCE: instrument has platform pivotally connected with the base, box without bottom filled with plastic material, tie-rod device, bearing member which can be adjusted in height with spacers and guides mounted on the plate. The layer of material comprises particles. The box is connected with the platform through a damping link provided with arresting carrier.

EFFECT: enhanced accuracy of measurements.

2 dwg

FIELD: plastic metal working.

SUBSTANCE: method comprises calculating the stress-strain condition of the tool and blank with regard for their materials and geometry, plotting a diagram "deformation force - friction coefficient" of the process of plastic deformation, determining experimentally the deformation force, which corresponds to the actual condition of the surfaces of tool, blank, and lubricant, and determining friction coefficient from the diagram.

EFFECT: enhanced accuracy and reduced labor consumption for determining.

3 dwg

FIELD: investigating or analysis of material.

SUBSTANCE: method comprises determining the limit value of the stress by measuring the angle of inclination of the surface which is provided with the initial material. The device comprises changeable coating with projections and locking member made of a frame having thin baffles or thin film made of an adhesive agent.

EFFECT: improved method.

2 cl, 3 dwg

FIELD: investigating or analyzing materials.

SUBSTANCE: device comprises housing, mechanism for loading, specimen holders that are provided with parallel bearing planes and mounted one opposite to the other. One of the holders cooperates with the loading mechanism. The mandrel provided with the spherical indenter is interposed between the specimen holders. The device has the mechanism for rotation of the indenter around its axis and unit for measuring the applied moment. The mechanism for rotation of the indenter is made of the lever secured to the mandrel, segment secured to the lever, and flexible link that embraces the segment and undergoes the load.

EFFECT: expanded functional capabilities.

1 dwg

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises measuring parameters of the pavement and calculating the grip coefficient. First, the ordinate of the micro-profile of pavement is measured, and then the dependence y = f(x), which describes the micro-profile in a given section, is determined. The dependence is used for determining the length of the curve of micro-profile, and parameters Ki of the pavement roughness are determined from the formulae proposed.

EFFECT: simplified method and reduced cost of determining.

2 dwg

FIELD: measurement technology; test equipment.

SUBSTANCE: method intends for inspection of rolling bearings, plain bearings and bearing units in instrument engineering, mechanical instrument engineering and electric machine engineering. One ring of bearing is loaded with permanent radial force and the other one is brought into oscillatory motion with specified frequency and amplitude by means of electro-mechanical system made of sync electric motor provided with active rotor and with two windings on stator. One winding is connected with dc source and the other one is connected with ac source. Alternative current is measured in second winding. Angular speed of oscillations of rotor is measured additionally and equivalent dissipative factor is calculated as product of constitutive factor of electric motor and relation of average meaning of current value product during period by speed to average square speed within the period.

EFFECT: improved precision of measurement.

1 dwg

FIELD: investigating or analyzing materials by mechanical methods.

SUBSTANCE: device comprises base, holder for specimen mounted on the base, carriage with holder for counter-body, loading unit, meter of friction force, drive for moving one of the holders, guide secured to the carriage perpendicular to the surface of the specimen, rod that can be set in translational motion in the guide, loading unit mounted at one of the ends of the rod, pivot mounted at the other end of the rod, holder made of a rod whose one end is secured to the axle of the pivot and the other end is provided with counter-body, spring, meter of friction force mounted on the carriage oppositely from both sides of the holder of counter-body and parallel to the plane of the specimen at the same distance from the axis of the pivot to the working surface of the specimen. The spring locks the holder of counter-body perpendicular to the working plane of the specimen. The axis of rocking of the pivot is parallel to the surface of the specimen and perpendicular to the direction of movement of the specimen and counter-body.

EFFECT: expanded functional capabilities.

1 cl, 1 dwg

FIELD: test equipment.

SUBSTANCE: machine can be used for testing materials and lubricant matters for complicated trajectories relatively movement of interacting friction pairs. Two-coordinate friction machine has base, sample's holder, two-coordinate drive, counter-body's holder, loading mechanism interacting counter-body, two-component force detector connected with counter-body's holder, program control system and friction force main vector instant value automated estimation system. Two-coordinate drive is made in form of two independent movable carriages which move at mutual-perpendicular directions. Holder of flat sample is disposed onto one carriage and counter-body's holder, loading mechanism interacting with holder and two-component force detector connected with holder of counter-body are disposed on the other carriage. Program control system is made in form of control computer connected with independent control modules and with electric engines through matching unit. Electric engines drive two-coordinated drive into motion to provide movement of indicator which interacts with working surface of sample along continuous nonlinear two-dimensional trajectory.

EFFECT: widened functional abilities; improved precision; better truth of result.

4 cl, 1 dwg

FIELD: engineering of equipment for friction tests.

SUBSTANCE: as sample holder a shaft is used, which is connected by means of connecting rod mechanism to swinging movement drive, made with possible setting of shaft rotation angle and its rotation speed during rotation for given angle. On top of sample a counter-sample is mounted with its own holder. Sample loading unit abuts by rollers on counter-sample holder. Measuring system includes forces indicator, connected to counter-sample holder, sample movement indicator, connected to its holder, indicator of load output, connected to samples loading unit, optical-mechanical indicators, each one of which is made in form of disk with slits pinned onto axis of arrow of appropriate indicator between emitter and photo-detector, and is connected to computer through mouse port.

EFFECT: increased trustworthiness and precision of tribological characteristics of round and spherical bodies during rotation thereof.

6 cl, 3 dwg

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