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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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 (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.
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