... rotor dynamics parametric excitation Mathieu-Hill equation floquet analysis unbalance resonance critical speed shear deformation gyroscopic effect Abstract This study, following a previous investigation by the same authors, deals with unbalance effects in the stable domain...

... Abstract The dynamic analysis of parametrically excited rotors is a research field of great interest and practical importance, since instability and resonant behavior can cause issues ranging from anomalous noise and wear to catastrophic failures. This study is focused on the effects...

... Turning flow into side branches against a deadleg along the main run can generate high levels of pulsations if the piping system acoustic resonance frequency matches closely the flow generated instabilities within the T-junction characterized by specific Strouhal number (St) that is function of the branch...

..., vibration and resonance of the beam, and force of the water droplets. It is especially important to study the effect of water droplet impacts on the natural vibrations occurring within the system in multiple planes. The rotational motion of the apparatus causes the arm to deflect proportional to the moment...

... when only one side of the structure is accessible is the use of ultrasonics in either a resonance approach or a through transmission approach. This study will focus on the use of the through transition approach using ultrasonic guided waves transmitted and received by Electro Magnetic Acoustic...

... tests, to discover if a different oscillatory behavior resulted. skull brain resonance vibration absorber Proceedings of the ASME 2021 International Mechanical Engineering Congress and Exposition IMECE2021 November 1-5, 2021, Virtual, Online IMECE2021-69054 EFFECT OF SHAKING AT OR NEAR...

..., the strength of the local acoustic source at the junction is also reduced resulting in a lower peak normalized pressure amplitude at the deadleg. The peak amplitudes of pressure pulsations occur at frequencies exactly matching the deadleg 1/4 wavelength resonance, whether it is tuned or detuned with respect...

... with the eight-element and two mass points was set up, and the vibration response parameters were analyzed accurately from simultaneous equations of motion. In the vibration test, resonance peaks from the mounting table and muffler parts of two units were confirmed in three excitation drives. The first resonance...

... developed a novel MR compatible X-ray tube motor. Vibrations from the structural instability of a motor can lead to mechanical failure, as well as image artifacts due to shaking X-ray focal spot on the anode target; hence it is important for proper X-ray tube motor operation to identify the resonant...

... the possibilities and causes of the elastic coupling failure thru global vibration measurement and past incident investigation. Applied countermeasures are reviewed and an integrated flexible coupling design is presented. Diesel Engine Marine Propulsion Shaft System Resonance A CASE STUDY...

... Vibration due to a bearing failure in a pump created significant vibrations in a fifteen foot by fifteen foot by eight feet tall mounting platform due to excitation of resonant frequencies. In this particular application, an 18,000 pound pump was mounted to a structural steel platform. When...

... of their different cross-sections is deduced. For double numeric integration the slope and the deformation of the shaft is calculated. The frequency in which the cracked system would enter in resonance is calculated. The rigidity of the shaft with crack is smaller that the rigidity of the shaft without crack. Based...

... Detecting extraneous matter that deposits on a compliant receiver platform can be performed by means of the resonance shift method, whereby the original and altered natural frequencies of the host structure are compared to evaluate the amount and/or position of the attached matter. By scaling...

... regime parameters, to reproduce in details the main resonance peak (common smooth curve) of tube system and to clear up the transition of the system in the zone of stability loss with further definition of stability region borders. hydro-elasticity discrete vortexes numerical experiment...

... 13 05 2008 This paper presents a fuzzy control method for a resonant vibration grain dryer. The proposed control method identifies and maintains the resonant condition for the dynamical system having constant linear stiffness, varying mass and varying damping. Both simulation results...