This article examines the acquisition of modal characteristics from a train wheel through experimental modal analysis. Train wheel and rail interactions are critical components worth studying. If the wheel-rail interactions while accelerating or braking excite any of the system modes during the ride operation, it can induce an undesirable effect upon the passengers’ ride and comfort. Hence, the execution of modal analysis is vitally important.
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Modal analysis provides important information about the natural frequencies, damping coefficients and mode shapes of a test unit to optimize its design and improve its structural behavior. The modal parameters and mechanical properties of a structure helps users understand its vibration characteristics in operating conditions.
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It is crucial to ensure that none of the engine components have any resonances that lie within the optimal rpm operation range. If any of the parts have certain structural dynamics in the range of operation, then the vibration and noise particularly at resonant frequencies can be dangerous and unpleasant.
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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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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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The Modal Data Acquisition (MDA) function for the CoCo-80X/90 allows users to conveniently acquire modal data in the field. The CoCo Testing Plan provides an overview of the measurement process and also provides the ability to customize the measurement entries.
This article describes a step-by-step process of the CoCo MDA function along with the CoCo Testing Plan feature. A brief overview of transferring the data from the CoCo to EDM Modal in order to post-process the data is also presented.
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This article examines the acquisition of modal characteristics from a bullet train wheel by performing experimental modal analysis. The wheel vibrations affect the dynamics of the wheel-rail interactions. Understanding these vibration characteristics will help mitigate the vibration and noise at high speeds.
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Executing the modal analysis of a structure is crucial in order to analyze the modal parameters of a test object. The natural frequencies, damping and mode shapes of the unit under test provides help to adjust the mechanical properties of a structure by optimizing the design and improving the structural behavior of the test unit. Consequently, modal analysis is a critical part of product development.
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Watch the new Spider-80Ti video produced by Aakash Umesh Mange, Application Engineer at Crystal Instruments. Narration is provided by Walter Kemphaus, 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.
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Watch Aakash Umesh Mange’s new video featuring the powerful Spider-80SG data acquisition system combined with the versatile EDM DSA software. This simple and efficient package for strain gage measurements can include the Spider-80Xi chassis, which scales up to 512 channels. Contact our team to schedule a demo or to learn more.
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The new Vibration Visualization video produced by Aakash Umesh Mange (Crystal Instruments Applications Engineer) features the creation of 3D models for modal analysis.
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Watch Crystal Instruments new Vibration Visualization video featuring Walter Kemphaus.
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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.
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