As part of their practical training, students should meet with the gadgets they will encounter in practice; however, the tasks should be simple and easy to understand so that students can understand and implement them in a limited period of time.
Measuring systems of our production are already included in teaching at a number of secondary schools and universities. They are mostly based on the standard EfLab program from our company, which is very intuitive and comfortable to use. At the same time it is completely identical to that used in industrial and laboratory operations in practice.
On this page you will find a description of several secondary school tasks. These tasks were carried out either as “turnkey” deliveries or as an extension of existing computer technology.
First task: measurement on the pump
A pump with an electric motor pumps water from the tank back to the tank. The discharge is manually or remotely throttled, the change in throttling changes the characteristic values measured on the pump. From the measured pressures and flow, program EfLab continuously calculates the hydraulic power delivered by the pump. Because electrical power is also measured, the program automatically calculates the efficiency of the pump.
In the task students have to enter into the program functional relationships, according to which the program calculates data. Students then gradually modify water flow and read the measured and calculated values. More advanced students can set EfLab to automatically measure the entire characteristic, including printing a graph to a printer.
Second task: searching for control algorithms
This task uses two-state and PID controllers, which are built into the EfLab program. Parameters of these controllers are set from the computer keyboard.
The regulated system consists of a glass tank into which water flows; the water flows out the tank to the drain. Both inflow and outflow are throttled, throttling is controlled from the computer. The water flow at the inlet and the water level are programmed. The system is equipped with an independent level switch to prevent overflow of the tank.
The task for students is to subtract the time constant of the system (about 1 minute) from the graph of the time run of the controlled variable (usually level) in two-state control, to find suitable control constants of the specified controller type (P, PI, PID). A number of disturbance variables can be introduced into the system, eg. the outflow can change with time. Advanced students can develop adaptive regulatory practices.
The third task is to measure the VA characteristics of the bulb
The lamp bulb is supplied from a controlled voltage source via a resistor in series. The voltage at the bulb and the voltage drop at the resistor are measured. A measuring card with programmable gain is used for the measurement so that the curvature of the characteristic at the beginning can also be measured.
The task for students is to enter a formula for conversion of voltage drop into current and set EfLab program to automatically measure the whole characteristic. At the initial part of printed VA characteristics students have to extrapolate the cold resistance of the bulb fibre.
All the tasks described were realized based on the ideas of professors from secondary schools. Both the technology used and our implementation team are so flexible that we can expect to expand this offer in future.
More information request here.