Dynalabs DYN-MS-20 Permanent Magnet Shakers User Manual
- June 3, 2024
- Dynalabs
Table of Contents
Dynalabs DYN-MS-20 Permanent Magnet Shakers
Product Support
If at any time you have questions or problems with the DYN-MS-20 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.
All rights reserved. Reproduction or issue to third parties in any form whatsoever is not permitted without written authority from the proprietors.
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.
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-20 has the following components:
- Electrodynamic Shaker
- Power Adapter
- Stinger Set
- Signal Cable
- R 1/8 Pneumatic Union
- User Manual
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
.
| Item | Description |
|---|---|
| 1 | Gain Knob |
| 2 | Sine Frequency Generator |
| 3 | External Signal Input |
| 4 | Trunnion Handle |
| 5 | Cooling Port |
| 6 | DC Power Input |
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
Outline Drawing
The dimensional properties of DYN-MS-20 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.
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.
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.
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 minimizing 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.
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.
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.
Cooling
DYN-MS-20 does not require forced cooling. Air convection cooling is
sufficient for the force levels given in the specifications.
Frequency Response
The following figure shows the Input voltage normalized acceleration levels
versus frequency of the shaker.
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.
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-20 Modal 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.