... excitations. frequency natural frequency particle velocity water particle velocity upstream oil & gas excitation pipe stability parameter vortex long span attachment pipe equation keulegan-carpenter number cross flow amplitude flow velocity resonance diameter span velocity range...

... , N/mm k y , N/mm k z , N/mm 1 - 9910 11510 2 36530 - 11290 3 34840 6142 9553 Determining the natural frequencies and mode shapes of equipment structures using finite element modeling (FEM) during the design phase, is essential to understand its dynamic behavior...

... (failed) bearings visual inspection. Fan inboard bearing replacement. Modal impact test to measure the fan natural frequencies. Startup. vibration data collection and analysis. It was observed that, fan inboard bearing radial clearance between bearing and housing was 0.22 mm exceeding...

... of resonance between structure natural frequency and motor/blade pass frequency. Results, Observations & Conclusions The results from detailed study and analysis recommended that in order to eliminate the resonance criteria, number of fan blades has to be changed from 11 to 12 and enormous amount...

... the crossing sleepers resulting in an increase in the first natural frequency due to the reduction in axial compressive loads and the change in behavior from beam to shallow arch. Implementing the analysis procedure discussed in this paper and taking into account the potential for crosswalking will help...

... Upstream Oil & Gas pressure drop operation vibration measurement location piping simulation modification pipe multiphase flow piping design slug flow mitigation requirement vibration screening society of petroleum engineers vibration slug plug flow natural frequency...

... acceptable vibration for static-equipment. Actual vibration measurement across complete length of the incinerator were performed for various operating condition. Operating data were analysed for these condition. In order to study the acoustic response, natural frequencies of the system and identify source...

... of the parametric study revealed that estimation of torque relies heavily on the bit constant. Axial vibrations increased when rotational speed was near to the natural frequency of the drillstring which resulted in increase of ROP. Type of formation affected the magnitude of lateral and axial vibrations. Reducing...

... to main line ration ≤13% and overall length of SBC ≤ 2m. High frequency vibration is found at operating pressure ≤ 5 barg. The major root cause is from the resonance of natural frequency and excitation frequency at low pressure condition. Flow Induced Turbulence LOF is the important subject...

... and minimize vibration. This resulted in increase of system's natural frequency while ensuring that the stresses are within permissible limits. Proposed modifications were designed for implementation without the need for shutdown. Post implementation, piping Vibration were reduced drastically and were found...

.... piping simulation maximize process safety operation piping design alteration natural frequency Implementation amplitude guideline vibration measurement Gasco modification identification process safety Upstream Oil & Gas stress analysis vibration process safety calculation vibration...

... of magnetic stiffness is significant due to several natural frequencies and excitation orders below the motor supply frequency. In general, the magnetic stiffness increases the natural frequencies, and the magnetic damping decreases the oscillation amplitudes of the lowest torsional modes. The calculation...