Dynalabs DYN-MS-250 Permanent Magnet Shaker User Manual
- June 3, 2024
- Dynalabs
Table of Contents
Dynalabs DYN-MS-250 Permanent Magnet Shaker
Product Support
If at any time you have questions or problems with the DYN-MS-250 shaker, please contact a Dynalabs engineer at:
Phone: +90 312 266 33 34 (9 a.m. to 5 p.m., UTC +3)
e-mail: info@dynalabs.com.tr
Warranty
Our products are warranted against defective materials and workmanship for one
year. Defects arising from user errors are not covered by the warranty.
Copyright
All copyrights of this manual belonging to Dynalabs products are reserved. It
cannot be reproduced without written consent.
Disclaimer
Dynalabs Ltd. provides this publication “as is” without warranty of any kind,
express or implied, including but not limited to, the implied warranties of
merchantability or fitness for a particular purpose. This document is subject
to change without notice, and should not be construed as a commitment or
representation by Dynalabs Ltd.
This publication may contain inaccuracies or typographical errors. Dynalabs
Ltd. will periodically update the material for inclusion in new editions.
Changes and improvements to the product described in this manual may be made
at any time.
Introduction
The DYN-MS-250 is designed to provide dynamic force excitation for modal
testing of mechanical structures.
The DYN-MS-250 is a compact, lightweight and powerful general purpose
electrodynamic shaker providing up to 250 N peak sine force.
General Information
Unpacking and Inspection
DynaLabs products provide adequate protection for undamaged products to be
transported. Document the damages that occur indirectly during the transport
and contact the customer representative. Check all components of the shaker.
If there is a defect, please contact us.
System Components
The DYN-MS-250 has the following components:
- Electrodynamic Shaker
- Amplifier (DYN-SA-1100)
- Cooling Unit (Blower + Hose + Hose connection adapter + R 1/2 Pneumatic union)
- Power Cable
- Signal Cable
- Stinger Set
- Fuse
- User Manual
Theory of Operation
DYN-MS-250 is an electro-magnetic actuator. Electro-magnetic actuators are
basically voice coils consisting of a permanent magnet and coil. The moving
element can be the coil or the magnet depending on the design requirements.
The moving element is usually suspended by an elastic membrane.
DYN-MS-250 has a moving coil (driving coil) whose current is controlled for
vibration generation. The stationary magnetic field is produced by a permanent
magnet.
Item
|
Description
---|---
1| Amplfier Input
2
|
Cooling Port
3| Trunnion Handle
Parameters| Specifications
---|---
Output Force (Sinus)| 250 N
Frequency| 0-5 kHz
Displacement (Peak to Peak)| 25 mm
Suspension| Spring
Maximum Acceleration| 100 g
Shaker Weight| 11.6 kg
Cooling System| Forced Convection
Operation Temperature Range| 5-35 °C
Maximum Input Current| 10A (RMS)
Amplifier| External
DYN-SA-1100
Operation Voltage| 110/220 VAC
Sine Freq. Generator| Activated by pulling out the gain knob
Sine Freq. Range| 0-15 kHz
External Signal Voltage Level| 10 VAC (PEAK)
Amplifier Weight| 5.3 kg
DYN-BLW-511 Monofaze Blower
Frequency| 50 Hz
Rated Power| 0.8 kW
Input Voltage| 230 V
Input Current| 5.2 A
Blower Weight| 15 kg
Outline Drawing
The dimensional properties of DYN-MS-250 shakers are given below. 
Operation and Installation
General
Refer to the figure below that shows the shaker connector configuration.
Connect the shaker/amplifier cable to the shaker and amplifier. Connect the
drive signal cable to the signal generator and connect the power cable of the
amplifier. Then turn on the amplifier by pushing the on/off button. To
increase gain up, turn the gain knob in clockwise direction. The user must
turn off the gain button in order to power down the shaker.
Amplifier
DYN-MS-250 uses an external power amplifier for drive signal amplification. Please note the wiring of the power amplifier given below.
Amplifier General
Amplifier Internal Signal
The amplifier can generate sine signal from 1Hz to 15kHz with 1 Hz increments
that the user can adjust with the Sine Frequency Generator Switch. Connect DC
power source and drive signal to shaker power input. Pull the Gain Knob out.
Raise or lower the Sine Frequency Generator Switch to the desired Sine
frequency. Adjust the Gain of the amplifier by turning the Gain Knob
clockwise. The frequency of the generated sine signal will be visible on the
LCD Screen.
Amplifier External Signal
Start the external signal source. Adjust the Gain of the amplifier by turning
the Gain Knob clockwise.
Amplifier Maintenance and Troubleshooting
The only user replaceable part is the fuse placed inside the shaker
.
Shaker-Structure Interaction (Stingers)
Stingers used in modal shakers are thin rods with a specific length yielding
low lateral and high axial stiffness. The high axial stiffness is necessary to
transmit the shaker force directly to the test structure with high efficiency
whereas the low lateral stiffness is necessary for protecting the shaker from
moment loads and to minimize shaker alignment issues. The stingers are mounted
on the shaker via a chuck. Force or impedance head sensors can be mounted on
the other side.
The DynaLabs modal shakers stinger sets include chuck and 3 stinger rod sizes.
The chuck consists of two pieces. The collet squeezes the stinger with the
tightening effect of the nut. Choose a collet size as close to your stinger
diameter as possible.
Shaker Alignment
Shaker alignment is a very important step of modal testing. Poor alignment can
cause force components in unmeasured directions and can even damage the
shaker. In order to overcome this problem, the trunnion can be adjusted for
proper alignment. Furthermore, the tip of the stinger can be removed during
the alignment process in order to reduce the free end deflection as shown
above.
Shaker Mounting
The shaker is designed to rest on its rubber isolators. However, these
isolators can be removed for rigid or semi-rigid mounting. If it is not
possible to bolt down the shaker, hot glue is also a good mounting option.
The shaker can also be suspended by elastic bungee cords for lateral testing.
Additional inertial weight may be attached to the bottom of the shaker using
hot glue.
Cooling
DYN-MS-250 does not require forced cooling up to 125N operation. In order to
achieve full performance level of 250N use the cooling unit supplied with the
shaker. The cooling unit must be used in vacuum mode for best performance. The
connections of the cooling unit are given as below.
Frequency Response and Resonance
The following figure shows the acceleration levels/Input voltage versus
frequency of the shaker.
Shaker Maintenance and Troubleshooting
The DYN-MS-250 shaker is a sealed device requiring no maintenance if the
operating instructions described in this manual are followed. Repair of damage
to the coil, exciter body or magnet core should not be attempted. The only
user replaceable part is the fuse placed inside the shaker. In order to
replace the fuse unplug all cables from the shaker and turn the cover in
counter clockwise direction as shown. Then replace the fuse and close the
cover. For any other problem, please return the shaker to Dynalabs for proper
repair.
Safety
Please ensure that this manual section is reviewed and understood prior to installation, operation or maintenance of the equipment. The danger of electrical shock or fire always exists in electrical equipment. The DYN-MS-250 MS Shaker is designed for safe operation. Safety features such as electrical insulation on outer surfaces, shaker body grounding connection are provided for safe operation of the shaker system.
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