“…The main closed-loop control system is based upon rotary position feedback of the actuator cams in the embedded bearers, this is a cascaded-loop control system system with inner speed and current loops. Details of the sensors can be found in 9,23,24 and details of the controllers applied and tested can be found in. 9 To ensure the integrity of the system in the presence of sensing faults, the additional algorithms required are: residual generation (using input and output measurements – discussed in a later subsection); residual evaluation (using the residuals and measured outputs); and fault accommodation (used to modify the controller format if faults are present).Figure 1.FTCS overview for mechatronic switch.…”
Section: Sensor Fault Detectionmentioning
confidence: 99%
“…The techniques as outlined in the previous section were first applied in simulation to determine an ideal level of performance. More details of the dynamic model of the laboratory demonstrator system are given in 9,23,25 and a diagrammatic overview is given in Figure 2. The simulation results shown here focus on multiplicative disconnect faults affecting the position and velocity sensors, as discussed above.Figure 2.Schematic showing an overview of the system.…”
A fault-tolerant control scheme (FTCS) was developed for a novel mechatronic track switch for the first time. The FTCS was first developed and tested on a simulation model of the system, before being applied to an experimental actuation system in the laboratory. Both the simulation and experimental results show that this FTCS works as expected and allows the switch to continue operating as desired under sensor failure, preventing damage to the switch.
“…The main closed-loop control system is based upon rotary position feedback of the actuator cams in the embedded bearers, this is a cascaded-loop control system system with inner speed and current loops. Details of the sensors can be found in 9,23,24 and details of the controllers applied and tested can be found in. 9 To ensure the integrity of the system in the presence of sensing faults, the additional algorithms required are: residual generation (using input and output measurements – discussed in a later subsection); residual evaluation (using the residuals and measured outputs); and fault accommodation (used to modify the controller format if faults are present).Figure 1.FTCS overview for mechatronic switch.…”
Section: Sensor Fault Detectionmentioning
confidence: 99%
“…The techniques as outlined in the previous section were first applied in simulation to determine an ideal level of performance. More details of the dynamic model of the laboratory demonstrator system are given in 9,23,25 and a diagrammatic overview is given in Figure 2. The simulation results shown here focus on multiplicative disconnect faults affecting the position and velocity sensors, as discussed above.Figure 2.Schematic showing an overview of the system.…”
A fault-tolerant control scheme (FTCS) was developed for a novel mechatronic track switch for the first time. The FTCS was first developed and tested on a simulation model of the system, before being applied to an experimental actuation system in the laboratory. Both the simulation and experimental results show that this FTCS works as expected and allows the switch to continue operating as desired under sensor failure, preventing damage to the switch.
“…A new generation of track switching concepts are emerging from projects such as S-code [1], In2Rail [2] and REPOINT [3]- [4]. improving rail network performance.…”
Track switches are essential in order to enable railway vehicles to change routes however they are also the largest single cause of failure on the railway network. A new generation of switching concepts are emerging from projects like In2Rail, REPOINT and S-Code that promise to improve rail network performance through the use of new mechanisms, monitoring and control systems. This paper focusses on modelling and control of a lab-demonstrator from the REPOINT project. Unlike conventional track switch machines, this actuator needs closed loop feedback control. First, a detailed simulation model of the actuator is developed and validated against experimental results. Two model-based control designs are then developed and tested: a classical cascaded P/PI controller and a modern state feedback controller. The two controllers are compared and it is found that, whilst there are some performance differences, both meet the requirements for use in a redundantly actuated REPOINT switch.
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