PEPS-VX Vibration Cancellation Add-On for PEPS

February 04, 2012

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PEPS-VX®
Vibration Cancellation Add-On for PEPS
Precision Electronic Positioning System  

  U.S. Patent No. 5,832,806
General Specifications
  Power Supply:
    Completely powered from PEPS (less than 1w max)
  Maximum Servo Bandwidth:
    10 Hertz
  Lowest Closed-Loop Resonance:
    0.2 Hertz
  Air Consumption:
    0.0375 scfm per psig of isolator pressure approx. (dry, clean air, filtered to 20m m or better)
  Physical Dimensions:
    5"(h) x 1.8"(w) x 7.5"(d) (165mm(h) x 46mm(w) x 190mm(d))
  Weight (unit alone):
    3.25 Lb. (1.47 kg)
  Inertial Sensors (3):
    TMC-VSVI or VSV2 (upright or inverted) 5 Hz long-throw velocity sensors. 1.7" dia. x 3.6" height. 1Kohm coils. BNC connector 1/4-20 Mounting Stud< (and metric/granite adapter plate)
     

 

 
User Interface Includes
  Controls:
    Height, pitch and roll gain controls. “Engaged” LED indicator. Simple DIP- switch control over which degrees- of-freedom are enabled (for fine tuning)
  DB-25 connector:
    Full duplication of PEPS’ AUX I/O connector, including height, pitch, and roll analog outputs and feedforward inputs. Open-collector “status OK” logic output. Optional external power supply inputs.
  System includes:
    The PEPS-VX controller, 3 inertial sensors, and all required cables. No special installation tools required. Comprehensive operating manual.
       
       
       
       
       
       
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PEPS-VX

Vibration Cancellation Add-On for PEPS¨
Click here for a larger image.

TMC’S PEPS-VX® Vibration Cancellation System is an inexpensive three degree-of-freedom active vibration isolation system which is used in conjunction with PEPS® – TMC’s electronic non-contacting valving system and our line of pneumatic vibration isolation mounts. It is designed for applications requiring a very high degree of vibration isolation. PEPS-VX® builds on the proven technology of air mount isolators by improving their performance in the 0.5-7 Hz frequency range – while not sacrificing isolation at higher frequencies.

This is accomplished by rapidly adjusting the air pressure in the supporting pneumatic isolators in response to signals derived from three inertial sensors mounted to the payload. In this way, PEPS-VX® can actually suppress noise in this frequency band by 20 dB or more.

Combined with the precision-leveling and feedforward capability of PEPS®, and when used with TMC’s Compact Sub-Hertz Pendulum System (CSP®), the result is a vibration isolation system an order of magnitude more efficient than a conventional passive air isolator.

Vibration Transfer Function : VerticalPEP VX Vibration Transfer Function

   Features

  • Controls the height, pitch and roll degrees-of-freedom of a payload without additional actuators. The system relies solely on the high-force, long-throw pneumatic mounts already in a system. No additional alignment of the payload is required.

  • Since PEPS-VX® uses existing air mounts for the actuation, the incremental cost of the system is extremely low.

  • Fully modular design allows system to be added to an existing PEPS system with only minor adjustments.

  • Can be retrofit to many existing pneumatic isolation systems.

  • Feedforward inputs allow for electronic control of a platform’s alignment with other equipment or tables.

  • A true analog/proportional valving system eliminates “pulse noise” introduced on the payload by PWM systems.

  • The controller provides fully buffered analog outputs indicating the platform’s height, pitch, and roll.

  • A compact package – measuring only 6.5(h) x 1.8(w) x 7.5(d) inches. Power is provided by PEPS.

  • “Smart” turn-on mode makes for a smooth “power up” by only engaging system once platform is floating.

  • Simple design – only three gain controls to be set for normal operation (in addition to the three adjustments required on the parent PEPS controller). All input/output functions are accessible through a single DB-25 connector. Once configured, its “smart” operation is controlled by PEPS.

  • All controls and access are on one side of the package, and it can be powered by remote for ease of integration into OEM applications. It can also be provided with gain adjustments preset.

 

 

 

 


 

 

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