HR Textron HR Textron (HRT)
is using VisSim/DSP for the rapid prototyping of hydraulic
actuator systems that control the transition from helicopter
mode to aircraft mode on military aircraft. The actuators enable
the engine thrust vectoring to be switched between vertical
and horizontal directions. HRT engineers successfully implemented
four control loops running simultaneously (including position,
velocity, resolvers, and Linear Variable Differential Transformers)
on a single TI C31 DSP target. They accomplished this without
having to write a single line of C code. VisSim/DSP helped HRT
save months of development time on this project. They attribute
this primarily to the following features of VisSim/DSP:
- Quality and efficiency of C
code
- Automatic programming of on-board
analog and digital data I/O
- The ability to use VisSim to
observe user-defined monitoring points and de-bug the control
loops interactively while the algorithm executes on the
DSP target.
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LMT Engineers at Lidkiping
Machine Tools (LMT), the world's largest supplier of precision
grinding machines, are using VisSim/DSP with a TI C32
target to design their next generation control system that includes
closed-loop adaptive filtering and control activation modules.
The adaptive filters act on real-time sensor data and a logic
module analyzes the filtered data to determine whether the machine-
workpiece combination is within specified tolerances. If a tolerance
exception is detected, a high-priority interrupt is generated
and transmitted to the machine control system (located on a
different hardware target) and the controller then takes corrective
action.
LMT engineers had a prototype application running in two days,
and were able to generate and download the filter to the DSP
target on the third day -- all without any prior training or
exposure to VisSim/DSP. Key reasons for their success:
- Ease of use of VisSim/DSP
- Advanced functionality such
as the power spectral density (psd) block, FFT and IFFT
blocks, Filter Design Wizards and variable-size buffers
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GEC-Marconi
GEC-Marconi (GECM)
is a sub-contractor for the European Joint Strike Fighter project
responsible for advanced engine controls. They are using VisSim/DSP
to develop controls for thrust vectoring in a Three Bearing
Swivel Nozzle using a TI C32 target. Two actuators, each manipulating
one control surface, are controlled using VisSim/DSP to implement
the pilot's commands for engine thrust vectoring.
GECM engineers noted that VisSim/DSP's ability to model and
simulate complex dynamic systems helped them quickly validate
the performance of their control system. Additionally, it's
ease-of-use and integration helped them develop prototypes quickly
which was critical to the success of the project. |
