GripTester Mk2 friction coefficient tester

The GripTester friction coefficient tester uses a three-wheel trailer to measure the friction coefficient through the brake wheel. It uses the fixed slip principle to determine the surface state and the specific characteristics of the airport runway friction.
The GripTester Mk2 friction coefficient tester can continuously measure the friction force and indicate the minimum friction level. If it is lower than the friction level of the runway, the runway is slippery. A technical description that gives the results in real time during the test and complies with all civil airport specifications.
GripTester Mk2 has a measuring wheel, using special smooth tires, mounted on the wheel axle with navigation, for measuring horizontal drag and vertical load forces. From these measurements, dynamic friction readings are automatically calculated and transmitted to a data acquisition computer (typically located in the tractor cab). The computer also calculates and stores a measurement speed for each reading.
Most of the weight of the GripTester friction coefficient tester is distributed on the two drive wheels. The drive wheels use patterned tires and are mounted on a solid stainless steel drive shaft. The drive shaft has a sprocket with 27 teeth; a shaft on which is mounted a measuring wheel with a sprocket with 32 teeth. The two shafts are connected by a transmission chain: this transmission system continuously brakes the measuring wheel, forcing it to slide.
The weight of the sliding wheel and the GripTester coefficient of friction tester causes a slight bending movement in the root shaft (measured by strain gauges mounted on the vertical and horizontal planes of the machine). The signal processing unit (SPU) installed on the GripTester friction coefficient tester processes the signals of these strain gauges and then transmits them to the data acquisition computer (DCC).
The SPU also receives a signal from a proximity sensor (activated by a wheel with 20 square teeth mounted on the drive shaft). This allows distance and speed to be calculated.

Characteristics
measurement system
The Mk2 coefficient of friction tester is GripTester to determine the sliding resistance of a surface using a continuous reading brake wheel fixed slip ratio design, which includes:
• Single measuring wheel system
• Sliding lock measuring system (15% slower than drive wheel)
• 10 "diameter smooth surface ASTM specification 1844 measuring wheel
The GripTester Mk2 friction coefficient tester is able to measure sliding resistance on all runways and runway surface types.
GripTester Mk2 friction coefficient tester can directly measure the horizontal force (drag force). Ability to measure straight forces (loads) directly.

Requirements for measurement of sliding resistance
The GripTester Mk2 friction coefficient tester is capable of measuring the sliding resistance of a continuous surface.
The GripTester Mk2 friction coefficient tester can measure sliding resistance values that meet ICAO standards and all international standards.

Consistency of technical specifications provided by the company
The GripTester Mk2 friction coefficient tester is a trailer-type surface friction measurement device, which can be transported and configured with Ford Transit van vehicles. A vehicle (e. g., a van or pickup) capable of carrying a payload of 1200kg and accelerating to 95 km/h may be used.
The GripTesterMk2 friction coefficient tester can be towed or manually pushed at a speed of 5Km/hr-130Km/hr.

Application
sprinkler system
The GripTester Mk2 friction coefficient tester uses a separate computer-controlled surface sprinkler system to operate. The water flow of the sprinkler system is constant and can be adjusted. The water film thickness can reach 1mm during the test. The sprinkler system includes:
• Solid, lightweight, fully loaded 1000 litre water tank; or 500 litre gelled water tank.
• Pumps;
• Piping;
At measurement speeds between 20Km/hr-95Km/hr, computer controlled electronic valves and flow meters can be used to maintain proper water flow.

Software
Findlay lrvine provides air-based software or subgrade software, which are Windows-compatible software systems for calculating sliding resistance results GripTester Mk2 coefficient of friction tester. The GripTester Mk2 Coefficient of Friction Tester is capable of continuous and uninterrupted collection of measurement data (data collected using air-based or subgrade software).
Findlay Irvine provides a suitable cable (minimum 7m long) GripTester the Mk2 friction coefficient tester to the data acquisition PC in the vehicle and all the components required to perform the described measurements.