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Fluid power systems are utilised in a wide variety of industrial applications. Such systems are predominantly controlled by PID controllers that are often very conservatively tuned. In applications such as structural test machinery where demanding reference trajectories are required to be tracked with minimum error, the standard feedback control approach is often inadequate. In this paper the performance...
A multi-axis simulation table (MAST) is a common type of hydraulic test rig used for vibration testing. Individual position control of each actuator is often used in practice, but this leads to axes which are coupled and controllers which are difficult to tune due to the apparent variation in plant dynamics. A modal control approach is described in this paper, and simulation results demonstrate its...
Any wing of the Airbus A380 is provided with 8 spoiler panels which are controlled by 5 servo-control actuators and 3 electrical backup hydraulic actuators (EBHA). A flight control computer controls the hydraulically driven spoiler actuators. A real-time simulator with electric I/O for simulating the EBHA is created to test Motor Control Electronic (MCE) operation and failure modes. The HIL and prototyping...
The paper explains how LabVIEW Real-Time and National Instruments (NI) real-time hardware targets can be used for the deployment of industrial control applications and the development of embedded control applications. LabVIEW Real-Time and NI real-time hardware targets, such as PXI, cRIO, FPGA and cFP, leverage the powerful graphical programming and measurement capabilities of LabVIEW for HIL applications...
Ground based test of avionics systems is an essential part of the certification process for any modern aircraft. Test rigs have to be constructed to interface to the various systems, and stimulate them electrically in a correct and timely fashion to simulate the appropriate flight regime. So, such a test rig will itself be a hardware in the loop system; furthermore, in order to test the systems in...
The PowerPoint presentation is about the initial measurement method provided by the General Motor Power Train Group and further use of statistics. Determinism, is defined, hard and soft real-time are explained, PID control and discrete control requirements are explored in the presentation. The presentation also explains the operation of the programmable logic controller (PLC), outlines the evolution...
The PowerPoint presentation is on the innovations of variable speed drives (VSD) design, control and applications. The impact of UK/European regulations, advances in VSD design, the application benefits of improved control, the safety critical applications, and future developments of VSDs and control are presented.
For every new type of application of variable speed drives it is essential that the requirements of the process are fully understood. It is then possible to select the optimum type of variable speed drive and to design the system for a performance to suit the given application.
This paper describes the use of a heuristic method to constrain the growth of gains in an adaptive MCS controller, which would otherwise be apparent under certain test conditions. The application and implementation of the method is given within the context of force control of a servohydraulic test rig. Experimental results show that the performance of the constraint method matches the requirements.
The PowerPoint presentation reviews the origins of the programming languages used in IEC 61131-3, a standard for industrial control programming. The member companies of the PLCopen Association is presented. PLCopen is a vendor and platform independent association that resolves topics related to control programming and supports international standards in the field. The uses of 3S CoDeSys, motion control...
The performance of ECDM machining, in terms of surface finish and rate of machining, is affected by many factors. Relationships between these factors and machining performance are highly non linear and complex in nature. Therefore, it is very difficult to develop a relationship between those factors and the machining performance with conventional mathematical modelling. This fact makes it very hard...
The PowerPoint presentation is about the need for the real-time modelling of the Airbus A380 fuel system, which is a multi-source, multi-sink, non-linear fluid network. Particularly, the flow in all pumps/valves/pipes/tanks due to pump and head pressures and the mixing of fuel properties (temperature and dielectric properties) need to be modelled, with an iteration period of 250 milliseconds. Available...
There is an increasing requirement to develop vehicles within a shorter time frame. Achieving a rapid vehicle development program reduces cost and maximises the impact of a new vehicle in an extremely competitive market place. Electronic systems form a key aspect of modern vehicles that contain increasingly more electronic control units (1998 Mercedes S-Class 40 and 2002 BMW 7-Series 47). The increased...
Some developments in the control of hydraulic servomechanisms are reviewed. The key role played in control system design by special purpose simulation packages such as Bathfp is demonstrated. It is shown that these packages also play an important role in condition monitoring.
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