Crystal Instruments continued to achieve relevance in wider global markets when the Spider-80X dynamic measurement system received certification from the Russian State Register of Measuring Instruments. The certification was obtained in partnership with Dipaul, Crystal Instruments' Spider-80X Russian distributor, and allows the highly scalable vibration controller and dynamic signal analyzer to be sold in Russia.
Read MoreCrystal Instruments shipped over fifty CoCo-80 handheld vibration monitoring devices in the month of June 2015. Used for preventative maintenance, vibration testing, and machine monitoring, the flexible software of the CoCo-80 allows technicians to easily take data through customized applications.
Read MoreModal testing is a common method to determine the characteristics of an object through exciting the structure to a certain vibration level and obtaining its resonance frequencies. It is important for a brake system to keep vibration under control during operation because excessive vibration while braking could cause driver discomfort, premature and irregular tire wear, and stress on steering and suspension components.
Read MoreNano-satellite developer Aquila Space has formed a strategic partnership with Crystal Instruments and Sentek Dynamics to test a prototype of its three-spectral-band imager, the primary payload of a 6U CubeSat scheduled to launch at the end of 2015.
The imager, comprised of three cameras which capture pictures of the earth from space, was subjected to vibration tests including a Resonance Survey, Sine Sweep, and Random Vibration affixed to Sentek Dynamics' 50 kN shaker controlled by Crystal Instruments’ Spider-80X Vibration Test Controller.
Read MoreThe Shaped Random function, which is capable of producing a carefully tailored random spectrum, is available in all of Crystal Instrument’s dynamic signal analyzers. The various constructions of the profiles can produce types of noise such as white noise, pink noise, and more. The Shaped Random function allows a tailored signal generation.
Read MoreIf an experimental measurement matches the Gaussian PDF model, the Gaussian model can then be used to draw many important inferences about the measurement. Many statistical curve-matching tests are available to establish if a measurement is Gaussian. These include the Kolmogorov-Smirnov (KS), Shapiro-Wilk and Anderson-Darling tests. For practical purposes, most well-fixtured and well-conducted random shake tests will produce data that pass any of these model-matching statistical tests for Gaussian behavior.
Read MoreThe mean and variance dominate statistical measurements in both the time and frequency domains. They are also reflected by so-called amplitude domain measurements. The most basic of these is called a histogram. To measure a histogram, break a signal’s potential amplitude range into a contiguous series of N amplitude categories (i.e. x is between a and b) and associate a counter with each category.
Read MoreOne statistical description measured during a random shake test is the Control Spectrum. Specifically, this variable is often the output of an accelerometer mounted to the shaker table. The sensor’s voltage output is scaled to engineering units of acceleration, typically gravitational units (g’s) sampled at a fixed interval, Δt. This time-sampled history is transformed to the frequency domain using the Fast Fourier Transform (FFT). In this process, a series of “snapshots” from the continuous time waveform are taken and dealt with sequentially.
Read MoreVerifying the robustness of products (or their packaging) by subjecting them to shaker-induced vibration is an accepted method of “improving the breed”. While shock bumps and sine sweeps are intuitively obvious, random shakes with their jumps and hissing are anything but. Even the language of a random test is confusing at encounter. Let’s try to improve upon that first introduction to random signals!
Read MoreThe table top conference, put on by the Society of Maintenance and Reliability Professionals, was attended by about a dozen other maintenance and reliability companies whose specialties ranged from oil analysis to machine condition monitoring using handheld vibration data collectors. The exhibits attracted about 100 practitioners.
Read MoreThis patent protects an important contribution to CI’s Vibration Control System (VCS) business, its unique means of controlling the kurtosis of a random vibration signal. A conventional (Gaussian) random signal has a peak-to-rms ratio (the crest factor) of about 3. In contrast, a high kurtosis random signal of the same RMS intensity, with identical spectrum shape, can have a significantly higher crest factor.
Read MoreCrystal Instruments has enhanced Vibration Testing through interfacing their Spider Vibration Control product family with the very latest commercially available High Speed Cameras.
Read MoreJohn Morris Industrial (a Division of John Morris Scientific Pty Ltd), a growing force in the test and measurement / condition monitoring equipment supply market announced today that it has signed a distribution agreement with Crystal Instruments, covering Australia, New Zealand and Pacific Islands.
Read MoreThe short answer is, “a lot!” DSA (dynamic signal analyzer) users will immediately be able to do more of what they already do, faster and easier. VCS (vibration control system) users will discover new and safer ways of testing products to requirement specifications.
Read MoreStrain gages have long been the premier analytic tool for static stress/strain analysis, characterizing the basic strength of structures. But, they also have important roles to play in dynamic structural studies.
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