The orbit plot is not only used to understand the magnitude of the vibration during a vibration test but also to observe the phase relationship between the different channels used to acquire the response of the unit under test. This is understood more clearly using a test case.
Read MoreCrystal Instruments is pleased to announce the release of EDM 9.1, the most reliable and powerful version available from Crystal Instruments.
Read MoreThe Spider-80Ti is a front-end from the Spider-80Xi hardware platform that enables temperature measurement. Spider-80Ti supports temperature measurements from thermocouples and RTD (resistance temperature detector) sensors.
Read MoreThe Minimum Energy option of MIMO Random is implemented to handle the nonlinearity of a multi-shaker table and provide fast convergent control.
Read MoreA Swept Sine test is a type of vibration test where the controller excites one specific frequency via sinusoidal voltage drive. As opposed to a Random test, where a broadband of frequencies is excited together like white noise, the Swept Sine test produces a response with energy in the primary frequency and its harmonics (i.e., frequencies that are multiples of the primary frequency).
Read MoreThe Vibration Diagnostic System (VDS) software provides several important tools for machine predictive maintenance data collection, analysis and management. When synchronized with a CoCo handheld analyzer, the system integrates factory and route structuring, machine information, vibration data and analysis all in one place. The diagnostic algorithms are based on the concept of a machine model, and VDS provides a powerful tool for building machine models. This tool is called the Machine Builder.
Read MoreOperational Modal Analysis (OMA) is commonly used to monitor and evaluate the health of building structures to investigate for any damage [1]. Studying the modal parameters of the structure can assist in observing changes in the dynamic properties which can further help in predicting error in certain elements which might need some repair or modification.
Read MoreThe Spider-80Ti is a front-end from the Spider-80Xi hardware platform that enables temperature measurement. Spider-80Ti supports temperature measurements from thermocouples and RTD (resistance temperature detector) sensors.
Each Spider-80Ti front-end adds 16 temperature measurement channels to the Spider-80Xi system. A Spider-80Ti front-end is user configurable to support either a PT100 RTD sensor or a K-type thermocouple. A combination of RTDs and thermocouples within the same Spider system is achieved by combining front-ends configured as RTDs and thermocouples.
This blog is part one of a two-part series. The next blog will discuss in detail about temperature measurements with the Spider-80Ti using thermocouples.
Read MoreSentek Dynamics and Crystal Instruments successfully installed a massive shaker at Tesla, Inc. in Fremont, California, USA. This is the first large scale system of its kind for mechanical vibration and shock testing, featuring a payload of over 4400 lbs and dimensions of 87 inches x 86 inches x 32 inches.
Read MoreThe accurate measurement of micro-vibrations is the first step of successful vibration contamination control. According to generic vibration criteria for vibration sensitive equipment, the RMS velocity of vibration criterion is from 50 to 3.1 μm/s (2000 to 125 μin/s). To measure such small amplitudes, high sensitivity and low frequency sensors must be used. Crystal Instruments provides the Wilcoxon WR 731 and PCB 393B31 accelerometers with the CoCo-80X data analyzer for this application.
Read MoreThe CoCo’s Save and Record functions are generally only discussed in the context of separate measurements. Although the Save and Record functions cannot be executed simultaneously, the CoCo is still able to store both the time waveform and FFT from the same set of original data. By exploiting the fact that FFT/block signals are always being buffered in the CoCo’s RAM, we can acquire the FFT signals while simultaneously recording the time waveforms to the SD card.
Read MoreSingle axis vibration control tests are widely used to qualify the behavior of the unit under test (UUT). If the UUT passes the test requirement then it provides confidence about the sustainability and durability of the test structure. However, sometimes excitation in multiple directions is required to test the robustness of the UUT which has led to the wide use of Multiple-Input Multiple-Output (MIMO) testing for the programmed test profiles. It is therefore important to make sure that the hardware setup allows for the unit to be tested in various configurations of single axis, dual axis, or three-axis. However, it takes long hours to manually change the setup because of the components (shaker setup, slip table, driving bar, fixture, etc.) involved.
Read MoreParadise Fireworks, the only black-powder fireworks manufacturer in Canada, recently rented a Spider-20E signal analyzer for some very unique tests. As a licensed explosion testing site in Canada, Paradise Fireworks was called upon to do some important blast testing for natural gas lines that lie beneath the small structures generally found in residential backyards. The goal of these tests was to define and quantify the dangers associated with having small structures (such as hot tubs and sheds) positioned above the junctions in these gas lines. To do this, Paradise would take pressure measurements from each blast using our high precision Spider-20E signal analyzer hardware in conjunction with our EDM DSA software.
Read MoreOn October 18th, 2020, a Bengkulu power plant in Western Sumatra Island successfully deployed a Power System Stabilizer (PSS) System and completed leading phase tests for Unit #1 and Unit #2 Generators, first of its kind in Indonesia.
The success of this project is a milestone for Indonesian power industry. The State Grid Corporation of Indonesia (PLN) highly praised the accomplishments of the engineering firm contracted to perform this test using Crystal Instruments’ CoCo-80 analyzer, and later awarded the firm with long term contracts.
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