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| Model
Descriptions |
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EnclosureShop supports 3 different
transducer data models: STD, TSL, and LTD.
Each of these models have different capabilities, parameters, and
derivation requirements, with the LTD model being the most powerful. |
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STD
(Standard Conventional) Model
The Standard model is useful when you have minimal
information about a transducer, and do not have the ability to obtain actual
measurements on a sample device. As such the accuracy of the simulation
is very poor due to the limited information. |
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TSL
(Transducer Speaker Library) Model
This model introduces a much improved means to represent
the mid and high frequency motor impedance over the Standard model.
The TSL model is maintained for backward compatibility with LEAP-4.
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LTD
(LEAP Transducer Data) Model
The LTD model is new to EnclosureShop, and provides
a much more detailed simulation of the transducer behavior across drive
level, temperature, excursion, and frequency. This revolutionary model
produces very high detail in the simulation of small and/or large changes
in the transducer's performance characteristics across a wide range of
operating conditions. In spite of its sophistication, the model for any
transducer may be derived from a simple set of constant voltage impedance
measurements taken under various operating conditions. The impedance data
curves are then analyzed and the model parameters optimized to best fit
the total measured characteristics of the transducer. |
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| LTD
Model Development |
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The LTD model was developed
through actual measurements on dozens of various electrodynamic
transducers. Over 1,000 curves were taken to develop this model
under a wide array of environmental and operating conditions.
Each was measured in free
air clamped in a rigid fixture. An accelerometer was also attached
to the cone to provide direct measurement of excursion, velocity,
and acceleration. After the various dynamic measurements were completed,
the voice coil was fixed via epoxy to obtain the blocked impedance
measurement.
In order to obtain high precision
correlated data, multi-channel simultaneous measurement was mandatory.
A GPIB program was written to control the various instruments for
timing/settling and manage the overall data processing.
•
Tek TM5006 Mainframe
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Tek TM5006 Mainframe
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Tek TM5006 Mainframe
•
Tek TM5006 Mainframe
•
Tek AM502 Differential Amplifier
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Tek AM502 Differential Amplifier
• Tek SG5010 Signal Generator
• Tek FG5010 Function Generator
• Tek AA5001 Distortion Analyzer
• Tek AA5001 Distortion Analyzer
• Tek DM5010 Digital Multimeter
• Tek DM5010 Digital Multimeter
• Tek DM5110 Digital AC Volt Meter
• Tek DM5110 Digital AC Volt Meter
• Tek SC504 Dual Trace Scope
• Tek SC504 Dual Trace Scope
• Tek PS5010 Triple Power Supply
•
HP 3575A Gain/Phase Meter
• HP 3575A Gain/Phase Meter
•
PCB 352B10 Accelerometer
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Custom built ICP Power supply
• Custom built Double Integrator
• Custom built 5Hz 3rd Order Highpass Filter |
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| Measurement
Examples |
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| Model
Comparison Examples |
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To illustrate
the differences between the models with actual transducers, the following
list contains a sample of some of the typical results to be expected from
each of the models. Some of the examples show changes in ambient temperature,
while others show mass changes, and all demonstrate differences in drive
level. The following PDF files contain over 300 graphs directly comparing
the actual transducer impedance measurements with model simulations. |
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