DynaLabs DYN-MS-20 20 N MS Shaker

Product Support

For questions or problems with the DYN-MS-20 shaker, please contact a Dynalabs engineer:

• Phone: +90 312 266 33 34 (9 a.m. to 5 p.m., UTC +3)
• Email: info@dynalabs.com.tr

Warranty

Dynalabs 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 belong to Dynalabs products and cannot be reproduced without written consent.

Disclaimer

Dynalabs Ltd. provides this publication "as is" without warranty of any kind. This document is subject to change without notice. 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.

1) Introduction

The DYN-MS-20 is designed to provide dynamic force excitation for modal testing of mechanical structures. It 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 are provided with adequate protection for transport. Document any damages that occur during transit and contact the customer representative. Check all components of the shaker. If there is a defect, please contact Dynalabs.

2.2) System Components

The DYN-MS-20 includes the following components:

• Electrodynamic Shaker
• Power Adapter
• Stinger Set
• Signal Cable
• 1/8 Pneumatic Union
• User Manual

2.3) Theory of Operation

The DYN-MS-20 is an electro-magnetic actuator, essentially a voice coil consisting of a permanent magnet and coil. The moving element, typically suspended by an elastic membrane, can be either the coil or the magnet depending on design requirements. In the DYN-MS-20, a moving coil (driving coil) is used, and its current is controlled for vibration generation. The stationary magnetic field is produced by a permanent magnet.

2.4) Specifications

2.5) Outline Drawing

The dimensional properties of the DYN-MS-20 shaker are provided below. The drawing shows the top, front, and side views with key dimensions indicated.

Front View Components:

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

Side View Components:

• 4: Trunnion Handle
• 5: Cooling Port
• 6: DC Power Input

Top View Components:

• 4 x M6 mounting points

Stinger Set Details:

• Collet: 4 pieces (0.75mm, 1.6mm, 2.4mm, 3.2mm)
• Stainless Rod: 3 pieces (2mm, 2.4mm, 3.2mm, length 300 mm ±10)
• Mounting thread: M2, 10-32 UNF

3) Operation and Installation

3.1) General

Refer to the figure illustrating the shaker connector configuration. Connect the shaker/amplifier cable to both the shaker and amplifier. Connect the drive signal cable to the signal generator and the power cable to the amplifier. Turn on the amplifier using the on/off button. To increase gain, turn the gain knob clockwise. To power down the shaker, turn off the gain button.

3.1.1) External Signal Mode

Connect the DC power source and the drive signal to the shaker's power input and signal input, respectively. Start the external signal source. Adjust the amplifier's gain by turning the Gain Knob clockwise.

[Image description: A diagram showing the shaker connected to an amplifier and a laptop, with a close-up of the shaker's control panel labeled "EXTERNAL SIGNAL" with a gain knob.]

3.1.2) Internal Signal Mode

The amplifier can generate sine signals from 1 Hz to 15 kHz in 1 Hz increments, adjustable via the Sine Frequency Generator Switch. Connect the DC power source and drive signal to the shaker's power input. Pull the Gain Knob out.

[Image description: A diagram showing the shaker's control panel with the "INTERNAL SINE WAVE" display showing "0 Hz" and an indicator pointing to "Pull the gain knob out". The gain knob is shown with a circular arrow indicating clockwise rotation.]

Adjust the Sine Frequency Generator Switch to the desired frequency. Increase the amplifier's gain by turning the Gain Knob clockwise. The generated sine signal frequency will be displayed on the LCD screen.

[Image description: A diagram showing the shaker's control panel with the "INTERNAL SINE WAVE" display showing "5 Hz". The gain knob is shown with a circular arrow indicating clockwise rotation.]

3.2) Shaker-Structure Interaction (Stingers)

Stingers are thin rods used in modal shakers, providing specific length, low lateral, and high axial stiffness. High axial stiffness ensures efficient force transmission to the test structure, while low lateral stiffness protects the shaker from moment loads and minimizes alignment issues. Stingers are mounted on the shaker via a chuck. Force or impedance head sensors can be mounted on the other side. Dynalabs modal shaker stinger sets include 4 collets, 1 nut, and 3 stinger rod sizes. The chuck consists of two pieces; the collet squeezes the stinger when the nut is tightened. Select a collet size that closely matches the stinger diameter.

[Image description: A diagram showing how a stinger is attached to the shaker using a chuck, collet, and nut. It also shows the stinger rod and details of the collet and rod sizes, along with mounting thread information.]

3.3) Shaker Alignment

Proper shaker alignment is crucial for modal testing. Misalignment can lead to unmeasured force components and potential shaker damage. The trunnion can be adjusted for alignment. The tip of the stinger can be removed during alignment to reduce free end deflection.

3.4) Shaker Mounting

The shaker is designed to rest on its rubber isolators. These isolators can be removed for rigid or semi-rigid mounting. If bolting down is not feasible, hot glue is a viable mounting option. For lateral testing, the shaker can be suspended using elastic bungee cords. Additional inertial weight can be attached to the bottom of the shaker using hot glue.

3.5) Power Requirements

The DYN-MS-20 features an integrated power amplifier powered by its adapter. Ensure that the output voltage and current ratings of any replacement adapter match the original.

3.6) Cooling

The DYN-MS-20 does not require forced cooling; natural air convection is sufficient for the specified force levels.

[Image description: A diagram of the shaker showing the "Cooling Port" and "Power Input". A note indicates that a pneumatic union is included in the bag, but the hose is not.]

3.7) Frequency Response

The following figure illustrates the shaker's input voltage normalized acceleration levels versus frequency.

[Image description: A Bode plot showing the frequency response of the shaker, with "TF_1Z+/MZ+; [g/-]" on the y-axis and "Frequency (Hz)" on the x-axis. The plot shows acceleration levels normalized to input voltage across a frequency range from 1 Hz to 12,000,000 Hz.]

4) Maintenance and Troubleshooting

The DYN-MS-20 shaker is a sealed unit and requires no maintenance if operating instructions are followed. Do not attempt to repair damage to the coil, exciter body, or magnet core. Return the shaker to Dynalabs for proper repair.

5) Safety

Ensure this section is reviewed and understood before installation, operation, or maintenance. Electrical equipment carries inherent risks of shock or fire. The DYN-MS-20 Shaker is designed for safe operation, with safety features like electrical insulation on outer surfaces.

5.1) Grounding

The shaker is internally grounded via the power adapter. A grounding socket is available on the shaker for additional grounding if necessary. An appropriate grounding cable is supplied with the shaker.

[Image description: A diagram of the shaker showing a "GND" socket.]

6) Declaration of Conformity

DynaLabs

CE Mark

This declaration of conformity is issued under the sole responsibility of the manufacturer. The product(s) are developed, produced, and tested according to the 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 the above-mentioned products meet all the requirements of the specified standards and regulations.

Murat Aykan, Technical Manager
Ankara, 15.07.2021