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AUTOMATED SYSTEM FOR HIGH ACCURACY MEASURMENTS OF COHESIVENESS COEFFICIENT (ATT-3)

Existing systems for measuring runways’ cohesiveness coefficient

Do not allow for high accuracy of measurements, that can influence on flight safety

We are offering

A radically innovative system

Automated system for measuring cohesiveness coefficient with high accuracy (ASCM-runway) takes measurements with a high level of accuracy

Presenting

ATT-3

• Implements a radically new way of continuous rolling of the measurement wheel, which is not connected kinematically to the wheels of the vehicle
• Measures the cohesiveness coefficient with the help of an electromechanical simulator, which provides electromechanical deceleration of the measuring wheel of the landing gear

The system’s functions

• Determining current speed and location coordinates
• Transmitting the processed data via a radio-channel to the control room
• Automated measurement and calculation of the runway cohesiveness coefficient
• Registration and visualization of the cohesiveness coefficient

Technical parameters

Parameters..............................................................................................	Value
Sliding coefficient control range	0-1
Accuracy of sliding coefficient control	0,005
Cohesiveness coefficient measurement range	0-0,8
Accuracy of cohesiveness coefficient measurement	0,005
Speed measurement range, km/h	40-130
Accuracy of speed measurements, km/h	1
Frequency of measuring instantaneous values of the cohesiveness coefficient, Hz	300
Weight of the measuring wheel suspension with weights, kg	70-100
Total weight, kg	600
Surface span for averaging the cohesiveness coefficient, m	2
Pressure in the pneumatic system of the measuring wheel, atm	2
Measuring wheel diameter, m	0,374
Maximum length, m	2,65
Maximum width, m	1,7
Maximum height, m	1
Accuracy of measuring the distance covered , m	10
Accuracy of locating the unit with the help of the GPS transmitter, m	5
On-board micro-controller С164 by Infineon Technologies	16 bit, 20 Мhz, 8 channels ADC
Panel computer TPC650 by Advantech	166 Мhz, 32 ROM, 6.4" TFT LCD with T

Advantages

• High accuracy
• High strength level
• Ability to measure cohesiveness coefficient on the whole length of the runway with any given sliding conditions
• Mechanical simulation principle which meets all contemporary technological requirements
• The rolling measuring wheel is not connected kinematically with the wheels of the vehicle
• An indirect measurement transmitter is used for measuring braking torque
• Easily automated braking operations of the measuring wheel

Perfomance test

System was tested on the functioning runway of the Pulkovo in Summer and Winter