All electronic systems are subject to noise. In general, noise is the portion of a signal that is undesirable, which means that the perspective or context is important for determining what noise is.
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In this case, the modal characteristics of a robot are acquired by performing experimental modal analysis. This robot is used in combats where the winner tries to destroy the opponent by causing damage or breaking crucial components. A quick modal survey reveals the natural frequencies, damping and mode shapes of the robot which helps users identify weak links in the structure. Hence, modal analysis plays a significant part in optimizing the design and performance of these robots.
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The case described in this article studies the modal characteristics of processing equipment acquired through experimental modal analysis. A hammer impact test is carried out with two tri-axial accelerometers to study the modal behavior of the test unit. The roving response method obtains a complete FRF column.
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Technical sessions (Tech Talks) exploring Electrodynamic Vibration Testing technology were organized by Crystal Instruments partner TANDM in South Africa at Cape Town Hazendal Wine Estate, Stellenbosch on March 15, 2022 and at Pretoria, Future Africa, University of Pretoria on March 17, 2022.
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Crystal Instruments (CI) recently attended the International Modal Analysis Conference (IMAC) held during the week of February 7–10, 2022 at the Rosen Plaza hotel in Orlando Florida. The conference was an all-around enjoyable experience, and it was good to be back in person to interact with and discuss the on-going work folks are pursuing in modal analysis.
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The auto-wake feature is a new and powerful function provided in EDM 10.0 software. This feature allows users to set up a wake-up alarm for Spiders to power on, perform a test, and power off. Users can upload up to 8 predefined tests and run these in Black Box mode (without a connection to a computer or network to run). This convenient mode allows users to acquire data autonomously or with little user intervention.
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Some data acquisition applications will inevitability run into one of the most common problems of the information age: information overload. Today, modern DAQ systems, such as the highly versatile Crystal Instruments Spider product line, can store significant amounts of vibration data. Now, memory limitations are significant. However, sifting through large amounts of data in order to capture a small transient event is undesirable.
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Turbine engines are the power sources of aircrafts. The reliability of turbine engines is crucial when ensuring aircraft safety. Failure analysis of turbine engines reveals the catastrophic damage a turbine blade failure can cause to the engine, depending on the location of the blade. Turbine blade fatigue testing can help engineers investigate and improve the material and design of turbine blades.
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Modal testing provides a crucial verification link in structural design by verifying the accuracy of simulation results and determining the structural characteristics of the actual product.
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A Ground Vibration Test (GVT) involves carrying out modal analysis of an aircraft and its sub-assembly components to analyze and detect any changes in their structural properties. The modal parameters determined through this testing are used to validate analytical models. The modal characteristics are also used to predict the flutter of the aircraft in order to create a safe flight envelope before flight operation. Thus, GVT is a crucial process in the design and development cycle of aircrafts.
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This paper discusses the usage and unique features of Multiple-Exciter Single-Axis (MESA) control with Crystal Instruments vibration controller.
MESA is a type of multiple exciter setup with all exciters arranged along a single axis. The goal is to combine the excitation forces and dimensional capabilities from multiple exciters to test a long and/or large Unit Under Test. MIL-STD-810G Method 527 discusses the terminology involving single and multiple exciter testing configurations.
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Aerospace hardware (i.e., space crafts) require high intensity acoustic level testing, which is usually accomplished inside a RATF (reverberant acoustic test facility). The acoustic noise level inside the RATF at NASA Plum Brook test station can reach 163 dB, which is the highest level among all RATFs around the world.
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Introduction
The SRS Synthesis test aims to create a time profile shock pulse whose Shock Response Spectrum matches a profile defined by the customer.
Video Capture is a new EDM Extension that works with IP cameras for vibration test monitoring and data acquisition. This feature provides real-time video monitoring and video or photo recording of the test process or any object of interest along with data acquisition. The Video Capture feature is available in EDM VCS (vibration control system) and EDM DSA (dynamic signal analysis) software for the Spider platform. Dome or box type IP cameras using the ONVIF protocol are supported by the video capture feature.
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Crystal Instruments is excited to announce the release of EDM 10.0, the latest software version for all Spider and CoCo products serving advanced and fundamental industries in addition to furthering academic advancements.
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