Fault Diagnosis of Bearings with Adjusted Vibration Spectrum Images by Mingquan Qiu, Wei Li, Zhencai Zhu, Fan Jiang, Gongbo Zhou

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2,4-Dichlorophenoxyacetic Acid in the Gas and Crystal Phases and Its Intercalation in Montmorillonite—An Experimental and Theoretical Study by Claro Ignacio Sainz-Díaz, Nelly L. Jorge, Jorge M. Romero, André Grand, Alfonso Hernández-Laguna

“…The molecular geometry, conformational analysis, and vibrational spectrum of 2,4-D were theoretically calculated using Density Functional Theory (DFT) methods. …”
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Vibration Properties of Submerged Sandwich Cylindrical Shell Based on Wave Propagation Approach: Analytical and Experimental Investigation by Guoqiang Guo, Yinglong Zhao, Anbin Yu

“…Finally, an analysis is conducted on the influence of thicknesses of viscoelastic and constrained layers on vibration spectrum and natural frequency under fluid-filled and -loaded conditions. …”
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Analisis Kerusakan Melalui Predictive Maintenance pada Main Drive Raw Mill Indarung II/III by Lukman Alrasyid, Jhon Malta

“…</p>The measuring process of the vibration is conducted through the use of transducer velocity in radial and axial directions on the drive and non-drive components of the RIM03 motor and the symetro gear. The vibration, spectrum, velocity, and speed of rotation are analyzed in the x-Viber. …”
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The Dynamics of Rotor with Rubbing by Jerzy T. Sawicki, Joe Padovan, Rabih Al-Khatib

“…Numerical simulations show rotor vibration spectrum rich in subharmonic, quasi-periodic, and chaotic vibrations. …”
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Analysis and Control of Abnormal Vibration of End Wall on High-Speed Electric Multiple Units by Dan Wang

“…The corresponding peak value at 40 Hz of the vehicle body end wall vibration spectrum is reduced by 85%, and the peak noise is reduced by 12%, The correctness of the mechanism analysis of abnormal vibration in the headwall area is verified, which provides a reference basis for guiding the structural optimization and operation and maintenance of rail vehicles.…”
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Vibration Transfer Path Analysis and Path Ranking for NVH Optimization of a Vehicle Interior by B. Sakhaei, M. Durali

“…The procedure shows a good ability of vibration path ranking in a vehicle and is an effective tool to diagnose the vibration problem inside the vehicle. The simulated vibration spectrums in different speeds of the engine have a good compliance with the tested results; however, some incompatibilities exist and have been discussed in detail. …”
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Time-Varying Total Stiffness Matrix of a Rigid Machine Spindle-Angular Contact Ball Bearings Assembly: Theory and Analytical/Experimental Verifications by Fawzi M.A. El-Saeidy

“…For a machine spindle-ACBBs assembly under mass unbalnce and a horizontal force at the spindle cutting nose when the bearing time-varying stiffness matrix (bearing cage rotation is considered) is used, the peak-to-valley variation in time domain of the stiffness matrix elements becomes significant compared to its counterpart when the bearing standard stiffness matrix (bearing cage rotation is neglected) is used. The vibration spectrum of the time-varying matrix case is marked by tones at bearing outer ring ball passing frequency, rotating unbalnce frequency and combination compared to spectrum of the standard stiffness matrix case which is marked by only the rotating unbalnce frequency. …”
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