Newsletter ABtronix – 2016/4

Dear ,

 

The days are shortening again. This means we have summer and we are halfway through the year. We hope that you have had a good first half year, but let’s enjoy summer first!
Besides the usual agenda and several introductions of new items an interesting item about when using Slip Tables in Thermal Environments is added.

Enjoy reading and your summer holidays!

 

Jos Luijten,

Office Manager



Contents:

 


Agenda

 

Sep 19-21, 2016

Conference:
ISMA Noise and Vibration Engineering Conference 2016
in conjunction with
'Uncertainty in Structural Dynamics 2016

University, Leuven (BE)

Oct 4-7, 2016

Exhibition:
World of Technology and Science

Jaarbeurs, Utrecht (NL)

Oct 11-12, 2016

Two day course:
Introduction to vibration

Breda (NL)

Oct 13, 2016

Course:
Fixtures, Software and Specifications for Vibration

Breda (NL)

Nov 8-11, 2016

Exhibition:
Electronica 2016

Messe, München (DE)

Oct/Nov 2016

Seminar
about calibration (in co-operation with Transmille)

Breda (NL)


Introducing the new Data Physics Abacus 901 Vibration Controller

The release of the controller software for SignalCalc Test Suite adds affordable, high performance vibration control to the Data Physics 900 Series hardware platform. The SignalCalc Test Suite provides a seamless environment for simultaneous vibration control and signal analysis.

 

Software Applications:

Ø  Random Vibration Control

Ø  Sine Vibration Control

Ø  Shock Vibration Control

Ø  General FFT Analysis

Ø  Data Acquisition and Recording

Ø  Structural Analysis

 

Simplified User Interface:

The SignalCalc 900 Series user interface simplifies test setup and run time operations. Enter test profile and the configuration wizard automatically sets up associated control and measurement parameters. Import shaker parameters from a large database of standard models to verify test feasibility. All setup, project, test article, and customer information is saved along with measurement data in a database. Easily search for data from different test runs and test types for analysis and report generation.

 

Enhanced Signal Analysis Tools:

The SignalCalc 900 Series has a unique ability to add signal analysis measurements to a vibration control test. For example, narrowband FFT, third octave, and histogram measurements can run simultaneously with the vibration control test. These measurements are configured using independent sample rates, bandwidths, block sizes, etc. Independent acquisition, analysis and control systems are no longer required. Signal analysis measurements are immediately available, removing the delay of waiting for post processing of recorded data.

 

User-Defined Real Time Signal Processing

SignalCalc 900 Series signal processing tools set includes user-defined custom signal processing. These algorithms are processed during the test in real-time using the embedded digital signal processors in the 901 hardware. The results of these algorithms may be displayed during the test and saved with test data.

 

User defined signal processing options include:

Channel Math – Creation of “User Channels” using mathematical operations on time domain signals from input channels: Integration, Differentiation, Addition, Subtraction, Multiplication, Division of Channel, Matrix Math, Low Pass, High Pass and Band Pass Filtering.

Signal Math – Creation of “User Signals” using mathematical operations on processed time and frequency domain signals: Addition, Subtraction, Multiplication, Division, FFT, IFFT, CFFT, ICFFT.

 

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The latest DJB Product - AT/18

 

An Ultra-lightweight miniature triaxial vibration transducer comprising of three voltage output piezo-electric accelerometer elements mounted orthogonally within a titanium block. The use of independent sensing elements ensures a rugged and repeatable triaxial measurement under the most extreme conditions. This design will outperform single element devices. The AT/18 uses high temperature piezo-ceramics as standard to ensure thermal stability. The accelerometer features a 1m integral cable which terminates with the industry standard 1/4-28 UNF socket, Extension cable assemblies of any length can be provided breaking out to 3 BNC plugs. The AT/18 is available with DJB’s unique high temperature IEPE solution capable of testing up to 185°C as an option. Standard sensitivity options are: 5mV/g and 10mV/g Other sensitivities are available.


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New programmable CAN / CAN FD interface and data logger is ideal for troubleshooting CAN networks

 

Kvaser AB has introduced a dual channel high-speed CAN to USB interface and data logger that allows users to monitor and log data from two CAN / CAN FD channels. Advanced features of the Memorator Pro 2xHS v2 (00819-9) include message filtering, triggers, error detection and generation, silent mode, plus an internal battery to handle short periods of power loss during logging. Capable of handling memory cards up to 64GB, this device provides days of data logging, making it ideal for troubleshooting CAN networks in the field. With such a large memory capacity, customers can now use the latest version of the Kvaser Memorator Config Tool to split the log files and export them in sections, making data handling much easier. An important feature of the Kvaser Memorator Pro 2xHS v2 is its ability to run user-developed programs. This programming functionality allows users to develop highly customised applications written in the Kvaser t programming language, including CAN protocol converters, CAN gateways, advanced CAN logging, plus additional tailored solutions (see the CCP/XCP article below for details).




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Slip Tables in Thermal Environments

There are a few issues to consider when using slip tables in thermal environments. While configuring slip tables for standard thermal tests is straightforward, more extreme temperature testing can cause complications that will require configuration by factory personnel. Additionally, thermal expansion of fixtures can present problems depending on the conditions and fixtures.
In most cases, a slip table is used to conduct three axis vibration testing. Three axis testing typically requires the shaker to be rotated from vertical to horizontal. Most often, one axis of vibration is conducted with the shaker in the vertical and the two remaining axes are conducted with the shaker in the horizontal position coupled to a slip table system. Below is a photo of a typical monobase slip table assembly produced by Data Physics.


Slip Tables Thermal Environments - Data Physics SignalForce Monobase Slip Table Assembly for Horizontal Testing

There are various types of slip tables available for horizontal testing and most are designed to operate in a thermal environment. Data Physics offers three types of table systems: oil film, linear guided, and hydrostatic bearing guided. The hydrostatic bearing guided tables can incorporate high pressure journal bearings or low pressure T-Film bearings.

When testing in thermal environments, it is critical to know the temperature range. Once the temperature range is known, appropriate thermal barriers can be proposed for the application. A thermal barrier is recommended on both the shaker armature and slip table. If a head expander is used, it is recommended that a separate thermal barrier be used for the head expander.

 


Thermal Barrier on Slip Table

At times, test labs will try to resist using thermal barriers on slip tables. There are several good reasons for using thermal barriers:

Ø  Isolating the vibration test equipment from extreme temperatures which can possibly alter material properties over a period of time

Ø  Protecting from and absorbing moisture

Ø  Protecting the slip table from corrosion

Ø  Allowing attachment of the chamber boot


Thermal Boot Attachment on Slip Plate with Thermal Barrier

The operational temperature range for the standard G10 thermal barrier is -40°C to +120°C. Other thermal barriers are available for more extreme temperature ranges. For even more extreme temperature conditions, custom tables are manufactured that include cooling or heating inside the slip table. These are configured and priced individually.

All SignalForce slip plates are manufactured from magnesium. Consequently, a significant concern is the condensation produced during the thermal cycling. The condensation creates a corrosive environment for the magnesium. Several issues can arise if the slip plate is not protected from the condensation: the inserts can fail, the counter-bored holes with pressed fitted washers can rise and fail, and the magnesium mounting surfaces can pit and flake. Eventually, the slip plate will fail because the customer will not be able to attach components to the slip plate or even attach the slip plate to the shaker.

Another area of concern when conducting horizontal testing in a thermal environment is material expansion and contraction of fixtures. This is a particularly significant concern when using large fixtures that are made of material other than magnesium. To save costs (and not have magnesium in corrosive environments), large fixtures are often made of aluminium. These fixtures typically have a base plate that attaches to the slip plate and reaches from one bearing supported area to a second bearing supported area. The difference in the thermal expansion of the aluminium fixture, which is in the thermal environment, and the magnesium slip plate, which is outside the thermal environment, can cause the bearings to bind.
For these reasons, it is important to understand a customer’s entire test methodology. Knowing the entire test plan, including the temperature range and fixtures to be used, can help to address potential problems before they happen. At a minimum, it is important to always propose thermal barriers when combining any vibration test system with thermal testing.


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Aim-TTi comes with new generator: TGP 3100 Series Pulse Generator

The TGP3100 Series are true pulse generators using all digital techniques. They can replicate the capabilities of traditional pulse generators whilst adding many additional facilities such as pulse modulations. As well as operating as pulse generators, the instruments can act as high performance noise generators and as function/arbitrary generators - making them truly universal waveform generators.
Unlike DDS based function generators the TGP3100 Series can generate pulses up to 50MHz with very low jitter and high resolution of width and delay (100ps). They can also operate in an asynchronously triggered mode with low jitter. A high drive capability output stage enables up to 20 volts pk-pk to be driven into a 50 Ohm load. As well as operating as pulse generators, the instruments can act as high performance noise generators and as function/arbitrary generators - making them truly universal waveform generators.

Features:

Ø  Pulse waveforms from 1mHz to 50MHz, minimum rise time 5ns

Ø  Very low jitter synchronous and asynchronous operation

Ø  Pulse, double pulse, pulse pattern and PRBS waveforms

Ø  Pulse period, width and delay resolutions of 100ps or 11 digits

Ø  Independently variable rise and fall times from 5ns to 800 seconds

Ø  True low jitter asynchronous operation, externally triggered pulses or pulse reconstruction

Ø  High drive capability output can provide 20V pk-pk into 50W (unmatched)

Ø  Wide range of pulse modulations including AM, FM, PM, FSK, BPSK, SUM, PWM, PDM using internal or external
modulation sources.

Ø  Triggered (burst count) or gated operation using internal or external trigger sources

Ø  Full Noise generator to 25MHz with selectable crest factor and user defined distribution

Ø  Full Arbitrary/Function generator with 16 waveform types - sine waves up to 50MHz

Ø  Arbitrary waveforms at 800MS/s sampling rate and 16-bit vertical resolution

Ø  Internal channel coupling, tracking and modulations (2 channel models)

Ø  Extensive internal/external modulation of all waveform types

Ø  Linear and logarithmic sweeps of all waveform types

Ø  Front panel mounted USB Flash drive interface

Ø  GPIB, USB and LXI compliant LAN interfaces


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DJB Launch New Modular Low/High Pass Filter

DJB Instruments UK Ltd has announced the addition of a new modular switchable Low/High Pass Filter to its growing product range. Available as a single channel DC powered unit or up to 9 channels in a AC/DC powered chassis the LHP Filter replaces a number of DJB’s outgoing modular products. Utilising simple BNC input and output connectors on the front panel, with user selectable AC/DC coupling and IEPE signal source (4mA/20VDC) the LHP offers a number of extra features previously not available.

 

Features include:

Ø  Input overload Indicator

Ø  Frequencies: Full range of filter responses available, Butterworth, Bessel, anti-alias & general purpose.

Ø  Switchable High/Low Pass

Ø  Single ended/differential input

Ø  Modular system

Ø  6 Gain steps to x50

 

DJB’s Managing Director, Neill Ovenden said of the launch, “The LHP launch is another step forward in DJB’s progress and growth strategy. We have been working to replace some of our older less flexible products and although filtering is not in such demand as it used to be it remains a critical part of many customers testing requirements. The LHP combines many of the popular features in one product, adding IEPE signal conditioning alongside filtering capability.’


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Courses ‘Introduction to Vibration’ and ‘Fixtures, Software and Specification’

On October 11 and 12, 2016 we will organize again the famous two-days course ‘Introduction to Vibration’ and it will take place in Breda (NL). This course aims to give more insight knowledge to the attendees in:
- testing with a shaker system
- dealing with several kind of tests
- reading the theoretical test and the implementation of the test
- designing a fixture

Here you can find the contents of this course.

A second course ‘Fixtures, Software and Specifications’ will be organised on October 13 for those who are interested in aspects of vibration technology which lays beyond the introduction course. This day is intended to be an interactive course, where you can discuss problems related to vibration technology with the host(s) and your co-participants. You can even bring your own fixture(s), if you have questions about it and want to discuss it.




If you or one or more of your colleagues are interested in one or both courses, please inform us by clicking on the Mail button below.


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ABtronix BV

Hazeldonk 6033

4836 LA   Breda

the Netherlands

T: +31 76 5968800

F: +31 76 5968888

mail@abtronix.com

www.abtronix.com


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