
Problem. Today, the problem of monitoring and diagnosing the technical condition of rolling stock from the point of view of traffic safety is one of the most urgent. This control is especially important for systems whose technical condition affects traffic safety, primarily the braking system. It is possible to carry out a qualitative check of the specified car systems with the help of appropriate equipment. Such equipment includes roller stands. You can get reliable information about the condition of the car's braking system when diagnosing it on inertial type roller stands. One of the main parameters is the value of the current speed. Goal. The purpose of the work is to study the metrological characteristics of the measuring system of the roller stand and to improve the method of checking the speed measurement channel. Methodology. Analytical research methods were used to develop a method of checking the linear speed measurement channel of an inertial roller stand, based on the principles of engineering knowledge in the field of metrology and measuring equipment. The results of analytical studies allow comparison with the results of experiments obtained during the operation of the roller stand of the mobile diagnostic station. Results. Developed methods of metrological control of the channel for measuring the linear speed of an inertial roller stand: control of the "roller – slots" system; control of the photosensor system and photosensor electrical signal transmission channel; control of internal time scales of the measuring system. Originality. In the practice of instrumental diagnostics of the technical condition of cars, low-speed brake stands of the power type are used. These stands have differences in the structure of measuring systems compared to high-speed inertial stands. In the article, the methods of metrological verification of the measuring system of such an inertial stand are improved, taking into account the minimization of errors in the diagnosis of brake systems and the design features of the stand (diameter of rollers and primary speed sensor). Practical value. The application of the proposed method of checking the measuring equipment allows to ensure: objectivity of the assessment of the measured parameters; the minimum time required for diagnostic operations; stability of measurements; simplicity and accessibility for service personnel; required accuracy of measurements. In addition, the proposed method can be used when conducting metrological certification of a roller stand.
У статті розглянуто питання метрологічної перевірки вимірювальної системи інерційного роликового стенда. Одним із основних параметрів є значення поточної швидкості у контакті колеса автомобіля з роликами стенда. Розроблена методика перевірки каналу вимірювання швидкості з використанням фотоелектричного датчика вихідних імпульсів. Ця методика стосується перевірці всіх складових каналу трансляції вихідного сигналу. Розроблена методика перевірки базується на принципах інженерних знань в галузі метрології та засобів вимірювальної техніки. Застосування запропонованої методики перевірки вимірювальної системи дозволяє забезпечити об'єктивність оцінки вимірюваних параметрів та необхідну точність вимірів. Запропонована методика може використовуватися при проведенні метрологічної атестації роликового стенда
роликовий стенд, похибки вимірювання, вимірювальна система, діагностичний параметр, measuring system, diagnostic parameter, speed, roller stand, швидкість, metrological control, measurement errors, метрологічний контроль
роликовий стенд, похибки вимірювання, вимірювальна система, діагностичний параметр, measuring system, diagnostic parameter, speed, roller stand, швидкість, metrological control, measurement errors, метрологічний контроль
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