For qualimetric tests of mobile machines and agricultural units without making changes to the design and suspending the performance of agrotechnical operations, it is necessary to apply new modern methods and measuring instruments. In the context of the intensification of agricultural production, the issue of creating mobile registration and measuring complexes for assessing the parameters of the movement of agricultural units during qualimetric tests is relevant. Accelerometers are the main element in the registration and measurement complexes developed by the university scientists. They are widely used in the automotive industry in assessing aerodynamic and traction-speed properties, braking properties, handling and stability, smooth running, noise and vibration, reliability, and passive safety. In the first version of the measuring complex, microelectromechanical systems (MEMS) technologies were used. The development of the measuring complex has become a measuring system for the dynamics and energy of multi-element agricultural units. The developed measuring system belongs to the technical means of diagnostics and operational control. It can be used in agriculture and engineering industries. The system is designed to determine the kinematic, dynamic, power and energy characteristics of mobile machines and their elements during road, field and bench tests. The measuring system includes inertial measuring devices consisting of gyroscopes, acceleration sensors and magnetometers, a navigation receiver, rotation speed sensors, electronic dynamometers, analogue and discrete inputs, a fuel flow sensor and wheel dynamics sensors. An innovative component of the measuring system is the way to detect slippage of wheels or drive sprockets. It consists of determining the wheel speed using a wheel dynamics sensor, which includes a gyroscope, accelerometer and magnetometer mounted in the centre of the wheel.

In the article a dynamic and mathematical models of wheel motion on a deformed surface are proposed. Analytical expressions were obtained using the results of traction tests of the T-16M self-propelled chassis. These analytical expressions can be used in traction calculations of wheeled tractors and self-propelled chassis at the stage of their preliminary design, as well as to evaluate traction efficiency, performance and energy efficiency.

No abstract

No abstract