Effects of vibration on passive intermodulation of microwave connector

2019 ◽  
Vol 12 (1) ◽  
pp. 39-47
Author(s):  
Tuanjie Li ◽  
Mingtai Li ◽  
Wangmin Zhai ◽  
Jie Jiang
Keyword(s):  
Surface Roughness ◽  
Spectral Density ◽  
Simulation Model ◽  
Contact Surface ◽  
Engineering Application ◽  
Roughness Parameter ◽  
Power Spectral ◽  
Series Of Experiments ◽  
Passive Intermodulation ◽  
Spectral Density Method

AbstractThis paper investigates the generation of passive intermodulation (PIM) in coaxial connectors during vibration. A series of experiments were designed and the simulation model and method were proposed for understanding these phenomena. We found that PIM is mainly influenced by the contact stress and contact surface roughness during vibration. Thus, a power spectral density method is presented to identify the roughness parameter of contact surface based on the Weierstrass–Mandelbrot model, and the simulation model and method were verified by the relative experiments. Eventually, some suggestions for engineering application were provided.

Distribution of Sub and Super Harmonic Solution of Mathieu Equation Within Stable Zones

2005 ◽  
Author(s):  
G. Nakhaie Jazar ◽  
M. Mahinfalah ◽  
M. Rastgaar Aagaah ◽  
N. Mahmoudian
Keyword(s):  
Spectral Density ◽  
Periodic Solutions ◽  
Mathieu Equation ◽  
Stable Region ◽  
Transition Curve ◽  
Harmonic Solution ◽  
The Third ◽  
Power Spectral ◽  
Stability Chart ◽  
Spectral Density Method

The third stable region of the Mathieu stability chart, surrounded by one π-transition and one 2π-transition curve is investigated. It is known that the solution of Mathieu equation is either periodic or quasi-periodic when its parameters are within stable regions. Periodic responses occur when they are on a “splitting curve”. Splitting curves are within stable regions and are corresponding to coexisting of periodic curves where an instability tongue closes. Distributions of sub and super-harmonics, as well as quasi-periodic solutions are analyzed using power spectral density method.

Corrected power spectral density of the surface roughness of tire rubber sliding on abrasive material

2021 ◽  
Vol 153 ◽  
pp. 106632
Author(s):  
Hiro Tanaka ◽  
Kenta Okui ◽  
Yuki Oku ◽  
Hironori Takezawa ◽  
Yoji Shibutani
Keyword(s):  
Surface Roughness ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Abrasive Material ◽  
Tire Rubber ◽  
Power Spectral

Determination of the Wenzel roughness parameter by the Power Spectral Density of functional Alumina surfaces

2016 ◽  
Vol 606 ◽  
pp. 57-62 ◽  
Author(s):  
P.L.G. Jardim ◽  
F. Horowitz ◽  
N. Felde ◽  
S. Schröder ◽  
L. Coriand ◽  
...  
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Roughness Parameter ◽  
Power Spectral

The Effect of Up-Cutting and Down-Cutting Directions on Materials Swelling in Ultra-Precision Raster Milling

2006 ◽  
Vol 532-533 ◽  
pp. 697-700 ◽  
Author(s):  
Ming Chu Kong ◽  
Wing Bun Lee ◽  
Chi Fai Cheung ◽  
Suet To
Keyword(s):  
Surface Roughness ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Surface Finish ◽  
Copper Alloys ◽  
Cutting Conditions ◽  
Power Spectral ◽  
Ultra Precision ◽  
Important Means ◽  
Cutting Direction

The influence of materials swelling across the steps on surface roughness under up-cutting and down-cutting direction in ultra-precision raster milling was investigated. The normalized extent of swelling is characterized by a swelling significance index, defined based on the power spectral density of the roughness profile. Materials swelling was found to be significant in ultra-precision raster milling, especially when copper alloys machined in the up-cutting direction. The findings in the present study provide an important means for improving the surface finish of the raster-milled surfaces and optimizing the cutting conditions.

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