Executing a sine vibration control test is a common method of verifying the performance of the manufactured product under real world conditions. However, there are various challenges that could hinder a successful sine sweep test. These challenges include system structural dynamics (resonances and anti-resonances present in the system), sensor placement location, measurement dynamic range, and sensor quality and mounting method.
Read MoreThis article examines the acquisition of modal characteristics from a disc brake rotor by performing experimental modal analysis. Brake systems are required for safe vehicle operation. The major component of a brake system is the disc brake rotor. While braking, the excitation frequency level can match natural frequencies and this phenomenon of resonance can cause the brake to squeal, potentially generating unpleasant vibration and noise.
Read MoreWatch the new Spider-80Ti video produced by Aakash Umesh Mange, Application Engineer at Crystal Instruments. The 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 MoreRandom control is a fundamental vibration test for various industries and manufacturers of products. The FFT based control algorithm transforms time signals to the frequency domain where analysis, calculation, comparison…average, (etc.) are done. The performance of Random control is determined by how well the FFT describes the system characteristics. Proper spectrum resolution must be chosen in order to avoid missing any desirable observations and to meet the requirement of the control performance.
Read MoreTo simulate equipment in a structure subject to earthquakes, vibration tests for seismic qualification utilizes different types of motion to effectively simulate the postulated seismic environment. Single frequency and multiple frequency are the two categories of motion that these types of motion fall into. Each category includes multiple waveform types for different cases.
Read MoreGround Vibration Testing (GVT) includes the modal analysis of an aircraft and its sub-assembly components to analyze and detect any changes to their structural properties. The modal parameters determined through testing are then used to validate the 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.
Read MoreWatch a dual shaker sine test performed on the Sentek Dynamics M5044A-PA155-LST900M Dual Shaker Vibration Testing System featuring Crystal Instruments Spider vibration controller.
Read MoreThere are many different shaker table arrangements based on various types of MIMO testing applications. The Multiple Shaker Table System ranges from Multiple Exciter Single Axis (MESA) to Multiple Exciter Multiple Axis (MEMA) with 2 to 6 shakers involved (e.g., three axis translational shaker table, four-poster, 6 DOF Multi Axis Shaker Table (MAST), etc.)
Read MoreFatigue Damage Spectrum (FDS) allows users to compare the potential damage caused by different Random profiles, Swept Sine profiles or a combination of both.
Read MoreBuildings, bridges, and dams are large stationary structures that are equally as important as vehicles and manufacturing equipment when it comes to understanding the dynamics of a structure. We may not immediately think of such large stationary structures or infrastructure as ever having any movement. However, when movement occurs for various reasons, including earthquakes or vehicles passing over a bridge, we find the consequences can be disastrous if structural engineers did not consider the structural dynamics of the structure upfront during the construction process.
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