Software

The in-house simulation tool "DynStar" is used to model and simulate processes that can be described by system models based on algebraic equations and differential equations. This enables the simulation of the static and dynamic behavior of the process itself as well as its automation components (MSR systems). With the help of the integrated fuzzy shell, knowledge-based and data-based models can be easily realized and implemented. The creation of a model is block-oriented with the help of a graphical user interface as a human-machine interface. Thanks to its real-time capability and the implemented process interfaces, "DynStar" can be used for measuring, controlling, regulating, operating, monitoring and visualizing tasks.

Areas of application

• Modeling and simulation of static and dynamic system behavior
• Simulation of measurement, control and regulation systems
• Simulation of power plant processes
• Data acquisition and recording (event-controlled, time-controlled)
• Process operation and monitoring

Functions

• Graphical user interface
• Extensive function block library
• Various interfaces (input/output cards, TCP/IP, serial, ...)
• Creation of macros (plant section model as function block)

Download(06.03.2023)

The MLDyn simulation tool supports the design and testing of magnetic bearing applications and has been verified on several test benches. It contains models of the magnetic bearing control loops for completely active magnetic bearing rigid rotors and is programmed in "DynStar". MLDyn is used in research to determine the behavior of rotors in various operating and fault situations.

Fields of application

• Investigation of rotor dynamics with different geometries (rigid rotor)
• Control loop investigations with disturbance and control behavior (load transients, different speeds, critical operating situations, start-up and shut-down process)
• Preparation of experiments on the test rigs
• Carrying out stability tests
• Support with controller design and parameterization
• Testing different controller structures

Functions

• Simulation of the control loop behavior for fully active magnetic bearing rigid rotors
• Modular design, easy replacement of control loop components
• Interference due to unbalance and external loads
• Can be configured for any magnetic bearing system by adapting application-specific parameters and structures

The MLDia diagnostic system is used to monitor and diagnose rotating machines with active magnetic bearings using the signals provided by the system. Characteristics are generated using signal-based and model-based methods. Knowledge-based fuzzy logic methods are used for fault diagnosis. The knowledge base for the creation of the fuzzy rules and their verification was developed using simulation calculations and experiments on several test benches.

Areas of application

• Monitoring the operating behavior of machines with magnetic bearings, taking into account the operating regime and system status
• Identification of sensor, actuator and controller faults in the magnetic bearing control loop
• Identification of faults caused by the drive and driven machine
• Lifetime monitoring of the snap bearings

Functions

• Measured value acquisition
• Measured value processing
• Characteristic generation
• Monitoring of signals and characteristics
• Monitoring of limit value violations
• Recording of relevant data and trends
• Diagnosis using fuzzy logic
• Output of alarm messages
• Modular design

The dSPACE development system is part of our laboratory equipment. Areas of application for this development tool are

• Hardware-in-the-loop simulation (HIL)
• Rapid Control Prototyping (RCP)
• HIL diagnostic technologies

Analysis of THermal-hydraulics of LEaks and Transients; developed by the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS)

• 1D modeling of thermal-hydraulic processes
• Modeling and analysis of control, safety and measurement systems, neutron kinetics, heat transport
• Extensive experience in the simulation of operating and accident behavior of boiling water reactors (BWR) and pressurized water reactors (PWR)
• Know-how in model development for individual effects, e.g.: Steam condensation in horizontal pipes in the presence of non-condensable gases
• Code validation for single effects and integral experiments
• Uncertainty and sensitivity analysis of model parameters
• Modeling and analysis of measurement systems and process control

3D simulation code for hydraulic and thermohydraulic processes.

The Laboratory Virtual Instrumentation  Engineering Workbench(developed by National Instruments) is used for the measurement, control and regulation systems of our test facilities.

• Monitoring and control of the test facilities with process control system
• User interface for visualization and control with LabVIEW
  • Visualization and monitoring of the measuring points from the test benches
  • Quick adaptation to new boundary conditions