Page 7 - Shimadzu Dynamic and Fatigue Testing Systems

Stable Input Waveform Measures Even Slight Differences in Performance

Due to the highly controlled response and accurate waveform Dynamic testing machines apply a load waveform to a product and measure the corresponding
reproducibility of Shimadzu dynamic and fatigue testing machines, response. The precise and reliable waveform input provided by Shimadzu dynamic testing
they can apply loads to products based on highly precise input machines and controllers allows identification of even slight differences in product
waveforms. performance and helps provide feedback for product design.
Providing such a stable input waveform ensures that material fatigue
testing can be performed with high accuracy and high reproducibility. For example ...
Therefore, even slight differences in product performance or
A variety of parts is used to achieve a comfortable ride in automobiles. To improve the performance of those
endurance can be evaluated. parts, data from evaluating their characteristics is essential. Therefore, the damping force is measured as test
frequency is varied. Shock absorber performance can be confirmed by measuring the relationship between
velocity and damping force or the response to a Lissajous or other waveform. The input waveform is
important for evaluating slight differences in performance.

24-Bit 10 kHz Autotuning and
Two-Degree-of-Freedom
High Resolution High-Speed Feedback Automatic Gain Control
PID Control
World's Highest Resolution World's Fastest Feedback Functions

Two-Degree-of-Freedom PID Control Minimizes Effects from External Disturbances
The control method (two-degree-of-freedom PID control) is able to optimize the target response for specified signals and the response to external noise. Optimizing
the control parameters using the autotuning feature helps maximize the system performance. The 24-bit high-resolution measurement function and 10 kHz
high-speed feedback ensure even sharp changes in test force or stroke can be controlled reliably.
Lissajous Waveform
Response with respect to the target value Response with respect to external disturbances
Excellent rise and
Control Signal Control Signal consistency with
Conveutional Control Conveutional Control specified signal
Two-Degree-of-freedom PID Control Two-Degree-of-freedom PID Control
Electric-Hydraulic Dynamic and Fatigue Testing System
EHF-U Series Velocity vs. Damping Force Waveform
Two-Axis Shock Absorber Testing System
Excellent rise and
consistency with
specified signal
Impressive Waveform Reproducibility
The 10 kHz high-speed feedback and 24-bit high resolution provides highly precise control waveforms for all measurement ranges.
Tests can be done with accurately controlled waveforms even in cases where the frequency of the input waveform varies, such for assemblies or finished products, or
when the status of the item being tested changes from hour to hour.
Autotuning Function
The autotuning function accurately reproduces target waveforms by
automatically determining optimal control parameters. Simply set up the sample Accurately reproduces Frequency-sweep
AGC function
target waveforms
in a similar state as for the intended testing and then specify the preload. Then
the function automatically tunes the manually adjusted control parameters.
Control Signal Control Signal
Automatically selects
optimal control parameters
Control Signal Control Signal
If tests are affected by servo valve frequency characteristics or PID control
settings are inadequate, then the amplitude can vary depending on the
frequency, as shown above. However, the frequency-sweep AGC function
Time (sec) Time (sec) corrects the amplitude to keep it constant at all frequency levels. Dedicated Shock Absorber Testing Software

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