Results 101 to 110 of about 5,175,461 (341)

Optimzation design of resonance changer for marine propulsion shafting in longitudinal vibration

open access: yesZhongguo Jianchuan Yanjiu, 2019
[Objectives] The transmission path of the longitudinal vibration of propeller shafting can be changed and the base response attenuated via a Resonance Changer(RC)integrated in the thrust bearing, enabling the natural frequency of the shafting to be ...
Hu Zechao   +4 more
doaj   +1 more source

Free vibration characteristics of cord-reinforced air spring with winding formation under preload conditions

open access: yesAIP Advances, 2023
A precise transfer matrix was employed to analyze the free vibration characteristics of a cord-reinforced air spring with winding formation under preload conditions. The air spring was abstracted as a rotary combined shell structure with variable winding
Yu-Qiang Cheng   +4 more
doaj   +1 more source

The Synergistic Effect of WS2 and SWNTs on Tribological Performance of Polyether MDI Polyurethane Elastomer under Dry and Wet Friction Conditions

open access: yesNanomaterials, 2022
To adapt to the complex application of polyurethane bearings, it is feasible to improve the tribological performance of single polyurethane-based friction materials through the synergistic effect produced by multi-component-lubricating fillers.
Gang Lu   +4 more
doaj   +1 more source

Preparation of polyethylene glycol brush grafted from the surface of nitrile butadiene rubber with excellent tribological performance under aqueous lubrication

open access: yesMaterials & Design, 2022
The water-lubricated bearing will be in a state of poor lubrication when marine stern shafts operate under low speed and heavy load conditions, which could cause severe wear and vibration, endangering the stealth performance of underwater vehicles.
Yinsong Liu   +4 more
doaj  

Study on Design Constraints of Conjugated Straight-Line Internal Gear Pair

open access: yesMachines, 2023
In order to solve the problem that the design constraints of the conjugated straight-line internal gear pair are unclear, the designing and checking of gear pairs requires repeated trial and error.
Yundong Liang   +3 more
doaj   +1 more source

Noise mechanisms in motorcycle helmet noise [PDF]

open access: yesProceedings of Meetings on Acoustics, 2010
A unique set of results on the acoustics of motorcycle helmets has been gathered during road tests on a rider wearing a representative modern helmet. The data were collected during a study of the noise which can cause hearing damage and, possibly, distraction in riders.
Carley, Michael   +2 more
openaire   +2 more sources

Noise reduction of dental drill noise [PDF]

open access: yes, 2008
Dental drills produce a characteristic noise that is uncomfortable for patients and is also known to be harmful to dentists under prolonged exposure.
Atherton, MA   +3 more
core  

A General Theory of Phase Noise in Electrical Oscillators

open access: yes, 2003
A general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically time-varying nature of all oscillators.
B. Razavi
semanticscholar   +1 more source

WHO Environmental Noise Guidelines for the European Region: A Systematic Review on Environmental Noise and Cardiovascular and Metabolic Effects: A Summary

open access: yesInternational Journal of Environmental Research and Public Health, 2018
To update the current state of evidence and assess its quality, we conducted a systematic review on the effects of environmental noise exposure on the cardio-metabolic systems as input for the new WHO environmental noise guidelines for the European ...
Elise van Kempen   +3 more
semanticscholar   +1 more source

Performance analysis of control allocation using data‐driven integral quadratic constraints

open access: yesAdvanced Control for Applications, Volume 4, Issue 4, December 2022., 2022
Abstract A new method is presented for evaluating the performance of a nonlinear control allocation system within a linear control loop. To that end, a worst‐case gain analysis problem is formulated that can be readily solved by means of well‐established methods from robustness analysis using integral quadratic constraints (IQCs).
Manuel Pusch   +2 more
wiley   +1 more source

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