Modal Testing of Rotors with Fluid Interaction

study of dna interaction with ethylenediaminetetraacetic acid and sesamol food additives

برهمکنش dnaتیموس گاوی طبیعی (ct-dna) با اتیلن دی آمین تترااستات (edta)در بافرtris-hcl با 8/7 ph ( دراین ph،edta به نمک دی سدیم تبدیل می شود) وسسامول در بافر tris-hcl با4/7 ph مورد بررسی قرار گرفته است. edta و سسامول استفاده فراوانی در تکنولوژی غذایی و صنعت شیمیایی دارند. مدل اتصال dna مربوط بهedta بوسیله اسپکتروفتومتری جذب، دورنگ نمایی حلقوی(cd)، ویسکومتری وژل الکتروفورز بررسی شده است. طیفuv ...

Modal Testing and Finite Element Analysis of Crack Effects on Turbine Blades

The study of vibration response of a turbine blade helps to detect the crack presence in the blade which alters its dynamic characteristics. The change is characterized by changes in the modal parameters associated with natural frequencies. In this paper, study of vibration response is made for turbine blade in the presence of a crack like defect. Turbine blade is initially assumed as a cantile...

Multihypothesis Testing Damage Diagnosis of Rotors : Application of Hilbert Transform

In this paper, a combined approach to damage diagnosis of rotors is proposed. The intention is to employ signal-based as well as model-based procedures for an improved detection of size and location of the damage. In the first step, Hilbert transform signal-processing techniques allow for a computation of the signal envelope and the instantaneous frequency, so that various types of nonlineariti...

Psychoacoustic Testing of Modulated Blade Spacing for Main Rotors

Aeroacoustic Testing of Open Rotors at Very Small Scale

This study examines the potential of very-small-scale experiments to simulate the acoustics of large scale counter-rotating open rotors in isolation and with a rectangular-plate shield. The experimental rotor model was based on the historical F7/A7 design developed by General Electric. The 80-mm diameter rotors were fabricated using advanced stereolithography and were powered by two high-perfor...