LMS Test.Lab Environmental – Options

The Programmable Quad Floating Amplifier (PQFA) module adds a number of features to the basic PQA concept. Floating inputs eliminate the risk of ground loops, and an analog programmable high pass filter removes unwanted low frequency components. Smart transducers (TEDS) can be connected directly to the PQFA module. It will help you to reduce the setup time drastically and even more important, you can avoid cabling errors which could even lead to severe over-testing.

The 20 button remote control unit connects to the host computer through USB and supports the LMS Test.Lab Environmental commands for operator control. It provides a convenient way to control levels, sweep direction and progress, shock firing, etc.

2 MSamples/channel FIFO buffers complementing the LMS SCADAS III input modules, offering the possibility to capture transients at the highest sample rate of 204 kHz sampling, independent of the number of channels in the configuration, for at least the duration of the 2 MSamples.

Random Response Limiting profiles enable you to effectively protect your test item against over testing. While the average control signal level will match its reference spectrum, the response at particular points of the tested object may be very different, due to the resonances of the device under test. High response levels at non-control channels could endanger the structural integrity of the tested object. The spectral limiting allows the vibration level at any channel (control- or measurement) to be limited by an auxiliary reference profi le, the response limiting profile. RMS limiting provides a more generic approach to overrule input control and reduce excitation levels for maximum protection of the test item.

The Sine on Random options offers the user the possibility to define a background noise level combined with up to ten fixed and sweeping sine tones. In combination with the Random on Random license the workbook supports true combined modes tests, mixing fixed and sweeping sine tones and narrow-bands in one test run.

The Random on Random option offers the user the possibility to define a background noise level combined with an unlimited number of fixed and sweeping narrow-band signals. In combination with the Sine on Random license the workbook supports true combined modes tests, mixing narrow-bands with fixed and sweeping sine tones in one test run.

The Sine Control Workbook offers a complete solution for closed loop shaker sine control testing, providing a safe, fast, accurate and reliable control algorithm. It allows the online acquisition and visualization of both proof-of-qualification and valuable engineering data.

Sine Notching is a response-limiting option, limiting the vibration level at any channel (control- or measurement) to a maximum value, defined by the notch-profile. While the average control signal level will match its reference spectrum, the response at particular points of the tested object will be very different. Due to the resonances of the device under test, these responses could become unacceptably high, endangering the structural integrity of the tested object. Sine notching will enable you to effectively protect your test item.

The LMS Test.Lab Tracked Sine Dwell Workbook is a control package that supports in a user-friendly way tracked sine dwell tests, which aim at a structural qualification by injecting a prescribed amount of cycles (load reversals) of prescribed amplitude into the test item, while holding it at resonance condition. Next to an amplitude control loop, the system also closes a frequency control loop, to lock a specified resonance, based on a phase or amplitude criterion. It provides those facilities you need for productively qualifying test subjects on a shaker installation while gaining engineering insight in its dynamics. It allows the online acquisition and visualization of both proof-of-qualification and valuable engineering data.

LMS Test.Lab Shock Control Workbook is a time-domain control package. It supports in a user friendly way the complete closed loop shaker control process. The system implements a safe, fast, accurate and reliable control algorithm. The workbook allows safe, real-time closed-loop control and monitoring; online viewing of instantaneous and averaged time histories, spectra and FRFs. It also delivers fast, easy and trouble-free setup definition.

LMS Test.Lab Measured Pulse allows the use of a stored pulse as a reference waveform for control, as opposed to a standard waveform such as a half sine pulse. The origin of such a stored pulse can be a measurement or the result of a synthesis exercise.

This add-in allows the computation of the shock response spectrum for a set of logarithmically spaced, tuned mass-spring-damper SDOF systems, subjected to base acceleration. The solution procedure provides an exact integration of the equation of motion by assuming a linear variation of the input acceleration over a time step. The analysis consists of two steps: a pre-calculation pulse correction, followed by the Shock Response Spectrum calculations. Overall, Primary and Residual response calculation are supported in positive, negative and absolute terms. Output quanitities include Acceleration, Velocity and Displacement.

The SRS module synthesizes a time waveform that corresponds to a user defined shock response using a series of superimposed time wave components. The synthesis module is seamlessly integrated in the shock control workbook. The package accepts both measured and tabulated target SRS spectra in acceleration, velocity and displacement domains.

Enables the recording of continuous time histories parallel to online analysis based on fixed sampled spectra, without jeopardizing the performance of the online sine reduction. The recorded throughput data are directly written to TDF on a PC-hard disc.

A smart transducer is an ICP type sensor with a programmable read/write memory, called TEDS (Transducer Electronic Data Sheet). Transducer characterics, such as model and serial number, brand name and sensitivity are stored in this memory and can be read through the LMS SCADAS III PQFA modules. The retrieved information is easily inserted in the channel list of all LMS Test.Lab acquisition applications. This automatic matching of transducers and input channels significantly reduces setup time and highly reduces the risk of wiring errors when a high number of sensors are used. Part of the TEDS memory is user-definable. The LMS specific usage of this option allows you to store the measurement point characteristics, such as point ID, position coordinates and Euler angles into the transducer. When this is done, the wireframe geometry can also be read from the transducers, along with the other information. This allows an automatic wireframe geometry creation in the LMS Test.Lab Geometry workbook.

This option extends the browse, search, sort and access functionality of the Desktop to genuine SDF, UFF and Matlab file formats, making data from external applications accessible in LMS Test.Lab without file conversions.

Users can investigate deformation shapes starting from time recordings, and animate the structural deformation scrolling through the time axis like a slow motion camera. Users can select a range in which the animation will automatically scroll, with the possibility to pause and restart the animation at all times. Any analyzed vibration pattern can be stored for future detail analysis or reporting purposes.

The Modal Analysis workbook offers various fast and accurate single or multiple reference parameter estimation algorithms, and a complete set of modal model validation tools, such as MAC and FRF synthesis.

Identification of modal parameters (resonance frequencies, damping and mode shapes), starting from user-selected segments of time data measured on a structure in operating conditions, for example a random or acoustic qualification test. A complete set of modal model validation, data re-synthesis and mode shape visualization tools is available.

PolyMAX is a state-of-the-art modal parameter estimator that gives superior stabilization diagrams, greatly simplifying the modal analysis process. It yields excellent results on lightly damped and complex structures and enables to effectively identify local modes. With the crystal-clear stabilization diagrams from the LMS PolyMAX parameter estimation algorithm, the analysis process is significantly simplified and operator-dependency of the resulting modal model is reduced.