Dynalabs DYN-MS-20 User manual

Model DYN-MS-20
20 N MS Shaker
Product Manual

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Product Support
If at any time you have questions or problems with the DYN-MS-20 shaker,
p lease contact a Dynalabs engineer at:
Phone: [phone] (9 a.m. to 5 p.m., UTC +3)
e-mail: [e-mail]
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.

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Table of Contents
1) Introduction...............................................................................................................................4
2) General Information ...................................................................................................................4
2.1) Unpacking and Inspection ....................................................................................................4
2.2) System Components ............................................................................................................4
2.3) Theory of Operation ............................................................................................................4
2.4) Specifications......................................................................................................................6
2.5) Outline Drawing..................................................................................................................7
3) Operation and Installation...........................................................................................................8
3.1) General...............................................................................................................................8
3.1.1) External Signal Mode ....................................................................................................8
3.1.2 ) Internal Signal Mode ....................................................................................................9
3.2) Shaker-Structure Interaction (Stingers)................................................................................10
3.3) Shaker Alignment..............................................................................................................10
3.4) Shaker Mounting...............................................................................................................11
3.5) Power Requirements..........................................................................................................11
3.6) Cooling.............................................................................................................................11
3.7) Frequency Response ..........................................................................................................12
4 ) Maintenance and Troubleshooting............................................................................................12
5) Safety......................................................................................................................................12
5.1) Grounding.........................................................................................................................13
6) Declaration of Conformity........................................................................................................14

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1) Introduction
The DYN-MS-20 is designed to provide dynamic force excitation for modal
testing of mechanical structures.
The DYN-MS-20 is a compact, lightweight and powerful general purpose
electrodynamic shaker providing up to 20 N peak sine force.
2) General Information
2.1) 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.
2.2) System Components
The DYN-MS-20 has the following components:
-Electrodynamic Shaker
-Power Adapter
-Stinger Set
-Signal Cable
-R 1/8 Pneumatic Union
-User Manual
2.3) Theory of Operation
DYN-MS-20 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-20 has a moving coil (driving coil) whose current is controlled
for vibration generation. The stationary magnetic field is produced by a
permanent magnet.

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5
Item
Description
1
Sine Frequency Generator
2
Gain Knob
3
External Signal Input
4
Trunnion Handle
5
Cooling Port
6
DC Power Input

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2.4) Specifications
Parameters
Specifications
Output Force (Sinus)
20 N
Frequency
0-12 kHz
Displacement (Peak to Peak)
5 mm
Suspension
Spring
Maximum Acceleration
40 g
Shaker Weight
4.1 kg
Cooling System
Natural Convection
(For continuous operation at 20N forced
cooling is suggested)
Operating Temperature Range
5-35 °C
Maximum Input Current
4A (RMS)
AMPLIFIER
INTERNAL
External Signal Voltage Level
1 VAC (PEAK)
Power Supply Voltage
19V DC
Power Supply Current
4.74A

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2.5) Outline Drawing
The dimensional properties of DYN-MS-20 shakers are given below.

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3) Operation and Installation
3.1) 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.
3.1.1) External Signal Mode
Connect DC power source and drive signal to shaker power input and signal
input respectively. Start the external signal source. Adjust the Gain of the
amplifier by turning the Gain Knob clockwise.

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3.1.2 ) Internal Signal Mode
The amplifier can generate sine signal from 1Hz to 15 kHz 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.

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3.2) 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 efficien cy
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
4 collet, 1 nut 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.
3.3) 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.

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11
3.4) 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.
3.5) Power Requirements
DYN-MS-20 has an integrated power amplifier which is powered by its
power adaptor. Please note the output voltage and current ratings of the
adaptor in a replacement adaptor is to be used.
3.6) Cooling
DYN-MS-20 does not require forced cooling. Air convection cooling is
sufficient for the force levels given in the specifications.

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12
3.7) Frequency Response
The following figure shows the Input voltage normalized acceleration
levels versus frequency of the shaker
4 ) Maintenance and Troubleshooting
The DYN-MS-20 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.
Please return the shaker to Dynalabs for proper repair.
5) Safety
Please ensure that this manual section is reviewed and understood prior to
installation, operation or maintenance of the equipment. The d anger of
electrical shock or fire always exists in electrical equipment.
The DYN-MS-20 Shaker is designed for safe operation. Safety features
such as electrical insulation on outer surfaces are provided for the safe
operation of the shaker system.

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5.1) Grounding
The shaker is internally grounded via the power adapter. However, if further
grounding is necessary a grounding socket is available on the shaker as shown.
Appropiate grounding cable is also supplied with the shaker.

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6) Declaration of Conformity
This declaration of conformity is issued under the sole responsibility of the manufacturer.
The product(s) are developed, produced and tested according to following EC- directives:
•2014/35/EU –Low Voltage Directive (LVD)
•2006/42/EU –Machinery Safety Directive
•2015/863/EU –RoHS Directive
Applied standards:
• EN 61010-1:2010
• EN ISO 12100:2010
• MIL-STD-810-H-2019 (Test Methods: 501.7 - High Temperature, 502.7 - Low
Temperature, 514.8 - Vibration, 516.8 –Shock)
DYNALABS MÜHENDİSLİK SANAYİ TİCARET LİMİTED ŞİRKETİ declares
that above mentioned products meet all the requirements of the above mentioned
standards and regulations.
Murat Aykan, Technical Manager
Ankara, 15.07.2021