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LDS Fixtures

Extend your testing capabilities with our head expanders and thermal barriers, designed for our electrodynamic shakers and LDS systems, providing force ratings of at least 9.8 kN (2205 lbf).

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LDS Fixtures

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The LDS® standard range of high-quality head expanders increases the capability of existing shaker systems by allowing users to increase the effective mounting surface compared to that of the armature, and thus accommodate larger payloads.

The head expanders have been designed using advanced finite element (FE) analysis modelling techniques and are cast from a high-strength magnesium alloy with excellent damping properties.
Each head expander is supplied complete with fasteners and fitting tools for immediate testing capability.
To enable use with environmental chambers, thermal barriers are available for each size in the range. Other insert patterns can be supplied to special order.

Uses

  • Increase the effective mounting surface of the shaker armature
  • Accommodate larger payloads
  • Increase the quantity of test items in one test to reduce testing time
  • Provide increased flexibility in fixture design

 

Features

  • High-quality aerospace-grade magnesium alloy structure with excellent damping properties
  • Usable frequency range up to 2 kHz
  • Standard insert pattern in M8, M10 or 3/8 UNC insert sizes
  • Accurate, in-house tested dynamic performance (first mode data supplied)
  • Includes full mounting kit with tools
  • Corrosion resistant: Non-machined parts are painted; machined parts are coated with lubricant
  • Standard off-the-shelf design for short lead time
  • Full technical support
  • Accelerometer options

Characteristics of head expanders

Designed using finite element analysis (FEA) technology, LDS® Head Expanders are cast from a high-strength, aerospace-grade magnesium alloy with excellent damping properties to minimize force dispersion. They have a usable frequency range from DC – 2000 Hz. To prevent corrosion, non-machined parts are painted, and machine parts are coated with lubricant.

We offer two types of head expander as standard products: guided and unguided.

  • Guided head expanders enable you to test payloads with masses greater than those the shaker can support. Available for LDS® V875, V875LS, V8, V9x shakers (whether trunnion- or combo-mounted) they are 1200 mm2 in size and have a support capability up to 1200 kg.
  • Unguided head expanders allow you to test payloads whose dimensions exceed those of the shaker’s armature work surface. As they are intended to accommodate larger – not heavier – articles, unguided head expanders do not provide additional load support. Unguided head expanders for the V850, V875, V875LS, V8 and V9x come in four sizes: 610, 762, 1000 and 1220 mm2 – for model V830-335, a 610 mm2 expander is available. Head expanders are also available for the larger water-cooled systems, including the 289 kN V994 shaker system.

For immediate testing, all head expanders are supplied complete with fasteners and fitting tools, including keyed payload attachment inserts in both grid and armature patterns, as well as armature screws, dedicated wrench key and torque wrench, and lifting eye-bolt.

Characteristics of thermal barriers

By reducing the heat conductivity between payload and shaker (or slip table, if one is used), thermal barriers enable vibration testing systems to operate with climactic chambers for environmental tests. We offer thermal barriers to match all sizes of head expander in the LDS range; other insert patterns can be supplied to special order.

The thermal barrier has clearance holes corresponding to the expander’s insert pattern and M6 helicoil inserts along the edges for the clamping strips. All thermal barriers are supplied with lifting eyebolts, clamping strips, corner clamping strips, and attachment screws.

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