Roam Robotics is a San Francisco-based company expanding human mobility with wearable robotics focused in three areas: recreation support, medical orthotics, and military applications.
Each application requires a thorough investigation to ensure user safety and comfort. Crystal Instruments is proud to provide the four channel Spider-20E dynamic signal analyzer for Roam to perform acoustic testing on their products.
Read MoreThe experimental object in this modal test is a hood cross-flow fan with an overall structure that includes a roulette wheel, rotor frame and cross-flow blades that are composed of metal materials. The fan is hung using bungee cords to imitate free-free boundary conditions.
Read MoreShock Response Spectrum (SRS) testing is commonly required for defense applications. The UUTs are tested under significantly high levels of shock waveforms.
The concept of SRS predictive notching was proposed a few years ago to fully test UUTs and ensure their survival experiencing real-world vibrations while protecting it from over testing.
Read MoreNASA’s response to Crystal Instruments addressed items NASA found beneficial, items NASA wanted changed, and items NASA benchmark tested on the prototype units. The Crystal Instruments prototype GRS systems were delivered according to a contractual agreement and performed well when tested for each listed specification with some areas of improvement.
Read MoreAmplitude precision is a simple specification that quantifies a channel’s amplitude error. The error is the difference between the nominal input amplitude and the channel’s measured amplitude.
Amplitude linearity is a way to specify the precision over a range of nominal input amplitudes. Precision typically depends on the input amplitude, and when just one number is provided for the amplitude precision specification, it is usually at 1 kHz and 1 V.
Read MoreThe United States Patent & Trademark Office awarded U.S. Patent No. 11,287,351 B2 for Vibration Visualization with Real-Time and Interpolation Features to Dr. James Zhuge (CEO), Dr. Jeff Zhao (Senior Product Manager), and Aakash Umesh Mange (Senior Application Engineer) on March 29, 2022.
Read MoreModal testing verifies the accuracy of simulation results and determines the structural characteristics of various products. The following test designates a train brake disc as the test object. The modal parameters and mode shape of the train are studied and analyzed. The test piece is shown in the following figure.
Read MoreThe experimental object undergoing modal analysis in this paper is a medical MRI QBC carrier structure, which is used to support patients laying in beds. The entire carrier is comprised of FRP composite material, and a thin board sheet installed with chips, capacitors, resistors, and other components is adhered in the middle section. For the experimental modal test, the carrier is hung using elastic ropes to imitate free-free boundary conditions.
Read MoreThis 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.
Read MoreModal 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.
Read MoreSignal Explorer allows users to easily compare signals from the same channel in different files. This software is a small .exe file included with EDM installation media and is available for download on the Crystal Instruments support site. No installation is needed. Just run it and load the folder containing your data files.
Read MoreIt 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.
Read MoreAll 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.
Read MoreIn 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.
Read MoreThe 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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