BRÜEL & KJÆR ® Modal and Measurement Exciters
Modal Exciter Type 4824
Modal Excitation System Type 3624
Designed for demanding modal test applications, electrodynamic
Modal Exciter Type 4824 provides precise, reliable, stable and long-
lasting operation. Highest quality materials, rugged construction and
stringent quality control assure a versatile means of modal excitation
for any experimental modal test.
Modal Exciter Type 4824 is available as a stand-alone unit – supplied
only with the appropriate trunnion and connecting cable – or as a
complete system (Type 3624), with matching power amplifier and
standard set of stingers and cables.
Optional accessories include traditional push/pull stingers, tension wire
stingers, robust lateral modal exciter stands, turnbuckles, cables,
chuck nut assemblies and various adaptors.
Uses and Features
Uses • Rugged, industrial design and compact, lightweight
• Experimental modal analysis using SIMO (single input construction for easy positioning/orientation relative to the
multiple output) and MIMO (multiple input multiple output) test object
testing techniques • High force-to-weight ratio due to rare-earth magnet technology
• Normal mode testing (NMT) • High-rigidity, low-mass magnesium armature for minimized
• Linearity studies force drop-off at resonance frequencies
• Mechanical impedance and mobility measurements • Low stray magnetic field
• Advanced structural dynamics investigations • Ideal for any excitation signal (sine, impulse and random)
• Test results for finite element model (FEM) correlation • Built-in optical sensor for accurate determination of the
and updating armature position
• Structural damage detection • Electronic DC control of tension wire pre-tensioning (optional)
• Robust lateral exciter stands for easy positioning and
Features orientation (optional)
• Force rating: • Included in a complete excitation system: Type 3624
– 100 N (22 lbf) sine peak
– 70 N (15 lbf) random RMS
• 1-inch peak-to-peak displacement for best low-frequency
excitation
• Wide operating frequency range: DC – 5000Hz
• Stingers:
– Through-hole design for easy setup
– Choice of tension wire or traditional push/pull stingers
– Tension wire technology minimizes lateral loading and
reduces potential rattling (slack) of the structure
www.bksv.com Product Data BP 1936 – 14
Description Stingers
Based on rare-earth neodymium magnet technology, this modal The “hole-through” design makes it possible to use tension wire
exciter features small physical dimensions relative to the force stingers or traditional push/pull stingers with the exciter. Easy
rating along with low total weight and a low-mass, high-rigidity, and fast attachment of both types of stingers is achieved with
spring-suspended armature. The low armature weight helps to the chuck nut assembly (for use with tension wire stingers) or
ensure high-quality force measurements by minimizing force with an M6 to 10–32 UNF threaded insert (for use with push/
drop-offs at the test specimen’s resonance frequencies. Four pull stingers).
upper radial flexures and four lower radial flexures, the latter
providing an additional guide for best stabilization, form a strong Optional Lateral Modal Exciter Stands UA-1607 and UA-1608 can
rectilinear guidance system which keeps the driver coil perfectly be used with Modal Exciter Type 4824.
centered in the magnetic assembly’s air gap. In the transverse In lateral setups of Type 4824, tension wire stingers can easily
directions and in torsion, the flexure system provides very high be mechanically pre-tensioned with the use of Lateral Modal
stiffness to counteract rotational movement of the test Exciter Stands UA-1607 and UA-1608. For electrical pre-
specimen. Also, through this configuration, the modal exciter can tensioning, especially useful in vertical, skewed excitation setups
absorb high lateral forces without damage to the exciter’s and for excitation in confined spaces, the optional DC Static
internal construction. Centering Unit Type 1056 can be used. Modal Exciter Type 4824
has a video HR-10 socket that outputs the signal from the built-
Cooling
in optical sensor, providing necessary feedback to the DC Static
Forced cooling is not required for Type 4824.
Centering Unit Type 1056. Traditional push/pull stingers require
no pre-tensioning.
Fig. 1 Dimensions of Type 4824 in its trunnion (in mm)
220
306
180 ø200
ø10
M6 10
10
M6
99.1
63
100
63
76
142.4
68.9
M8 ø7
226
010123
Modal Excitation System Type 3624 Modal Exciter Configurations
Type 3624 is a complete turnkey excitation system comprising See Modal Exciter Configuration Guide (BG 1483) for an
Modal Exciter Type 4824 with trunnion, matching Power overview of modal excitation systems, exciter stands, stingers,
Amplifier Type 2732, stingers and all necessary cables. tension wires, and force and impedance transducers.
2 www.bksv.com
Compliance with Standards
The CE marking is the manufacturer's declaration that the product meets the requirements of the applicable
EU directives
RCM mark indicates compliance with applicable ACMA technical standards – that is, for
telecommunications, radio communications, EMC and EME
China RoHS mark indicates compliance with administrative measures on the control of pollution caused by
electronic information products according to the Ministry of Information Industries of the People’s Republic
of China
WEEE mark indicates compliance with the EU WEEE Directive
Temperature IEC 60068–2–1 & IEC 60068–2–2: Environmental Testing. Cold and Dry Heat.
Operating Temperature: 5 to 40 °C (41 to 104 °F)
Storage Temperature: –25 to +70 °C (–13 to +158 °F)
Humidity IEC 60068–2–78: Damp Heat: 93% RH (non-condensing at 40 °C (104 °F)).
Specifications – Modal Exciter Type 4824
Matching Power Amplifier: Type 2732 (120 VA)
Rated Force (Sine Peak/Random RMS): 100/70 N (22/15 lbf)
Useful Frequency Range: 2–5000 Hz
Operating Frequency Range: DC–5000 Hz
Max. Rated Travel: 25.4 mm (1 in)
Max. Velocity (Sine Peak/Random RMS): 1.5/1.5 m/s (59/59 in/s)
Max. Acceleration (Sine Peak/Random RMS): 432/305 m/s2 (44/31 g)
Rated Current: 5.5 A
Suspension Stiffness: 4 N/mm (23 lbf/in)
Effective Moving Mass: 0.23 kg (8.1 oz)
Main Resonance Frequency: >6000 Hz
Weight of Exciter with Trunnion: 22.8 kg (50.1 lb)
Weight of Trunnion: 7.9 kg (17.4 lb)
Dimensions: See Fig. 1
www.bksv.com 3
Ordering Information
Modal Exciter Modal Excitation System
Type 4824 Modal Exciter Type 3624 Modal Excitation System
Includes the following: Includes the following:
• AQ-0649-D-050: Cable with two 4-pin Neutrik® speakON® connectors, • Type 4824: Modal Exciter
length 5 m (16.4 ft) • Type 2732: Power Amplifier (120 VA)
• KC-1007: Trunnion • UA-1598: Three Push/Pull Steel Stingers, including:
• UA-1612: Three adaptors M6 to 10–32 UNF – 3 × fastening screws
– 3 × adaptors, diameter 2.5 mm to 10–32 UNF
– 3 × steel rods, length 500 mm, diameter 2.5 mm
– 1 × 2.5 mm collet chuck (chuck nut with collet insert)
Optional Accessories
POWER AMPLIFIER UA-1603 Three 1.5 mm Collet Chucks and Adaptors, for
Type 2732 Power Amplifier (120 VA) tension wires, including:
• 3 × chuck nuts
ELECTRICAL TENSION WIRE PRE-TENSIONING
• 3 × collet inserts, diameter 1.5 mm
Type 1056 DC Static Centering Unit (must be calibrated with
• 3 × fastening screws
exciter at HBK)
• 3 × adaptors, diameter 1.5 mm to 10–32 UNF
© Hottinger Brüel&Kjær A/S. All rights reserved.
STINGERS, TENSION WIRES AND ACCESSORIES UA-1604 Three 2.5 mm Collet Chucks and Adaptors, for
UA-1596 Five 2.5 mm Push/Pull Steel Stingers, including: push/pull rods, including:
• 10 × adaptors, diameter 2.5 mm to 10–32 UNF • 3 × chuck nuts
• 5 × steel rods, length 200 mm, diameter 2.5 mm • 3 × collet inserts, diameter 2.5 mm
• 10 × fastening screws • 3 × fastening screws
UA-1597 Five 3.0 mm Push/Pull Steel Stingers, including: • 3 × adaptors, diameter 2.5 mm to 10–32 UNF
• 10 × adaptors, diameter 3.0 mm to 10–32 UNF UA-1606 Five 3.5 mm Nylon Stingers, including:
• 5 × steel rods, length 200 mm, diameter 3.0 mm • 5 × nylon rods, length 200 mm, diameter 3.5 mm
• 10 × fastening screws • 10 × fastening screws
UA-1598 Three 2.5 mm Push/Pull Steel Stingers, including: • 10 × adaptors, diameter 3.5 mm to 10–32 UNF
• 3 × fastening screws
• 3 × adaptors, diameter 2.5 mm to 10–32 UNF FORCE TRANSDUCERS AND IMPEDANCE HEADS
• 3 × steel rods, length 500 mm, diameter 2.5 mm Type 8230 CCLD Force Transducer (+44/–44 N range)
• 1 × 2.5 mm collet chuck (chuck nut with collet insert) Type 8230-001 CCLD Force Transducer (+220/–220 N range)
UA-1599 Three 3.0 mm Push/Pull Steel Stingers, including: Type 8230-002 CCLD Force Transducer (+2200/–2200 N range)
2021-06
• 3 × fastening screws Type 8230-003 CCLD Force Transducer (+22000/–2200 N range)
• 3 × adaptors, diameter 3.0 mm to 10–32 UNF Type 8230-C-003 Charge Force Transducer (+22200/–2200 N range)
• 3 × steel rods, length 500 mm, diameter 3.0 mm Type 8231-C Charge Force Transducer (+110000/–2200 N range)
• 1 × 3.0 mm collet chuck (chuck nut with collet insert)
BP 1936 – 14
Type 8001 Impedance Head
UA-1600 One 0.75 mm Tension Wire, length 5000 mm, including:
• 1 × fastening screw THREAD AND BUSHING ADAPTORS
UA-2052 Set of 10 Stud Adaptors, 10–32 UNF to ¼²–28 UNF
• 1 × adaptor, diameter 0.75 mm to 10–32 UNF
UA-2054 Set of 20 Bushing Adaptors, 10–32 UNF to
• 1 × 0.75 mm collet chuck (chuck nut with collet insert)
¼²–28 UNF
ËBP-1936---VÎ
UA-1601 Three 1.5 mm Tension Wires, length 500 mm, including:
• 3 × fastening screws CABLES
• 3 × adaptors, diameter 1.5 mm to 10–32 UNF AQ-0648 Cable with two 4-pin Neutrik speakON connectors,
• 3 × 1.5 mm collet chuck (chuck nut with collet insert) length 10 m (32.8 ft), for connection to Type 2732
UA-1602 Three 0.75 mm Collet Chucks and Adaptors, for tension AQ-0658 Cable with 9-pin D-sub connector to video HR-10
wires, including: connector, length 10 m (32.8 ft), for connection to
• 3 × chuck nuts Type 1056
• 3 × collet inserts, diameter 0.75 mm
LATERAL MODAL EXCITER STANDS
• 3 × fastening screws UA-1607 Modal Exciter Stand, max. exciter elevation: 1.24 m
• 3 × adaptors, diameter 0.75 mm to 10–32 UNF
(4.1 ft), mechanical pre-tensioning of tension wire is
possible via an adjustable spring
UA-1608 Modal Exciter Stand, max. exciter elevation: 1.64 m
(5.4 ft), mechanical pre-tensioning of tension wire is
possible via an adjustable spring
Skodsborgvej 307 · DK-2850 Nærum · Denmark
Telephone: +45 77 41 20 00 · Fax: +45 45 80 14 05
www.bksv.com · info@hbkworld.com
Local representatives and service organizations worldwide
To learn more about all HBK offerings, please visit hbkworld.com
Although reasonable care has been taken to ensure the information in
this document is accurate, nothing herein can be construed to imply
representation or warranty as to its accuracy, currency or
completeness, nor is it intended to form the basis of any contract.
Content is subject to change without notice – contact HBK for the
latest version of this document.
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