This paper presents findings from an experimental investigation employing this novel approach to identify the frequency signatures of a building under ambient excitations. The results demonstrate that this method effectively analyzes the dynamic properties of the structure, offering a promising solution for structural health monitoring applications.
Read MorePilots at the National Test Pilot School are conducting a Ground Vibration Test (GVT) on an Aermacchi MB-339, a military jet trainer and light attack aircraft, to analyze its dynamic behavior under varying conditions.
Read MoreCrystal Instruments attended the Fourth Vibration Institute Middle East Training Conference 2024 (VIME24) from November 11-13 at Al-Khobar, KSA.
Read MoreThe flagship data acquisition system Spider-20HE was used to gather vibration data for modeling and vibration suppression of rotating machines.
Read MoreGround Micro-Vibrations, also known as Seismic Vibration or Floor Vibration, refers to a kind of vibration noise with a small amplitude caused by non-earthquakes on the earth's surface. These vibrations are usually generated by natural vibration sources (such as wind, waves, etc.) or artificial vibrations (such as machine vibration sources, vehicles, etc.), that are a stable non-repetitive random fluctuation on the ground. Seismic Vibration is characterized by being of low frequency and small amplitude, and its displacement is generally only a few microns to tens of microns, with a frequency variation range between 0.3-5.0 Hz.
Read MoreDr. James Zhuge will chair a Dedicated Session: Data Acquisition Integrated with Space Technology at the upcoming SAVE 2024 conference in Dallas, Texas on Wednesday, November 6, 2024.
Read MoreThe flagship data acquisition system Spider-20HE was used to gather vibration data on a rotor-bearing setup. This vibration data was extrapolated and utilized for two neural network models.
Read MoreA test was conducted at a gun range located at 14750 Skyline Blvd, Los Gatos, CA 95033, to demonstrate the feasibility of detecting gunfire locations using three GRS units that are not connected by wires. Algorithms of time stamped signal processing were applied to the acquired data, and it was shown that the detection accuracy could be within 1 meter. This test exemplifies the application of GPS time stamping technology.
Read MoreThe Fatigue Damage Spectrum (FDS) serves as a pivotal tool in the assessment of structural integrity, portraying the relationship between damage and natural frequency across the frequency domain. Its utility extends to testing laboratories, empowering them to craft precise Random vibration test profiles by analyzing acceleration vibration data derived from real-world environments. By using the FDS, these labs can accurately delineate the damage experienced by structures under dynamic loads, facilitating the development of robust testing protocols essential for ensuring product reliability and safety.
Read MoreThe case described in this article examines the modal characteristics of a satellite model acquired from performing experimental modal analysis. A hammer impact test was carried out with two teardrop uni-axial accelerometers (mounted in different directions) to study the modal behavior. The roving excitation method assists in completely avoiding the potential mass loading side effect produced by a roving response procedure. A hard tip was selected to excite the higher frequency modes.
Read MoreDigital filters are powerful tools utilized during the data conditioning phase to analyze signals. These filters empower users to augment signal processing capabilities by integrating them with other data conditioning modules, thus generating advanced post-analysis functionalities. Among the primary types of real-time digital filters are the Decimation filter, the FIR (Finite Impulse Response) filter, and the IIR (Infinite Impulse Response) filter.
Read MoreA violin was suspended on a frame to a imitate free-free boundary condition. Sentek Dynamics’ BT-100M shaker was used to excite a violin at the base of its front panel. Polytec’s PSV500 laser scanner was used to measure and acquire the data from the back panel of the violin. Crystal Instrument’s EDM Modal software processed and analyzed the dataset to provide the modal parameters of the violin.
Read MoreVariance reduction does not alter the core mechanics of the control loop. Instead, it focuses on reducing the variance in the computation of the control PSD. As a result, the resulting control spectrum adheres more rapidly to stringent alarm limits, which proves particularly advantageous for extremely brief test durations.
Read MoreMIMO SRS vibration testing is challenging to execute due to stringent hardware and software control requirements.
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