МЕТОД ПРОГРАМНОГО РЕГУЛЮВАННЯ ПАРАМЕТРІВ РУХУ ВИХІДНОЇ ЛАНКИ ПНЕВМОАГРЕГАТУ ЗА ДОПОМОГОЮ ЗМІНИ ЕФЕКТИВНИХ ПЛОЩ ЛІНІЙ УПРАВЛІННЯ

Control of position pneumatic units includes tasks of precise positioning, speed and acceleration control, as well as ensuring reliability and safety of operation. Existing control methods can range from simple mechanical solutions to complex programmable systems using modern automation technologies and intelligent algorithms. In the context of dynamically changing production requirements and the need to improve the accuracy of operations, the development and implementation of new control methods become particularly relevant. This requires a deep understanding of both physical principles of pneumatic units operation and modern approaches to automation and control of technological processes. Two available methods of program control of pneumatic unit output motion parameters exist. The first method consists of changing the effective areas of control lines, and the second – is changing the value of braking force developed by the external braking device. The first method is suggested for the open loop program- time control, as the second method will cause energy losses due to the need to work to overcome the friction force developed by the braking device. A control algorithm for a position pneumatic unit is proposed, which is a set of consecutive values of the control signal. These values are not connected with each other by analytical dependence, so the simplest way of their assignment is tabular. It is assumed that the entire set of control signal values is simply entered into the controller's memory, and at set intervals the control signal is changed according to the table. The described control algorithm is quite simple to implement. It is possible to use two methods of regulation at open-loop program-time control, depending on the type of applied distribution equipment – analog and discrete-analog. The analog method allows the setting influence to be worked out more accurately but requires more expensive hardware costs; the discrete-analog method is less accurate, easier to implement, and more reliable. The essence of the discrete-analog method of regulation consists in replacement of exact analog values of effective areas by approximate ones, which are chosen as the nearest from a limited range of values provided by discrete distribution equipment.