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RISJitter Control for Optical Payload on Satellites
Publisher: American Society of Civil Engineers
Abstract: The jitter control technique by using dual-stage vibration isolation system for optical payload on satellites is discussed, and it is applied on a satellite to improve the imaging performance. The dual-stage vibration ...
Selecting Project Risk Preventive and Protective Strategies Based on Bow-Tie Analysis
Publisher: American Society of Civil Engineers
Abstract: In the practice of project risk management, project managers need to determine preventive actions to reduce risk probability before the risk occurs and/or protective actions to lower the risk impact after the risk occurrence. ...
Nonlinear Control of a Quadrotor With Deviated Center of Gravity
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a new adaptive tracking controller is developed for a quadrotor unmanned aerial vehicle (UAV) via immersion and invariance (I&I) approach. The controller is able to compensate parametric uncertainties ...
Algorithms for Generating Air-Void Structures of Idealized Asphalt Mixture Based on Three-Dimensional Discrete-Element Method
Publisher: American Society of Civil Engineers
Abstract: The air-void structure of an asphalt mixture is a very important feature because it significantly impacts the strength and modulus of the material. Consequently, in-depth research into an air-void structure for quantification ...
Extracting Mode Shapes for Beams Through a Passing Auxiliary Mass
Publisher: American Society of Mechanical Engineers (ASME)
Abstract: This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous ...
Tunable Three-Dimensional Vibrational Structures for Concurrent Determination of Thin Film Modulus and Density
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The real-time characterization of thin film properties can provide insights into the behavior of film material during process such as phase-transition, hydration, and chemical reaction. The shift of reasonant frequency in ...
Observations of a Filamentous Intrusion and Vigorous Submesoscale Turbulence within a Cyclonic Mesoscale Eddy
Publisher: American Meteorological Society
The Different Configurations of the East Asian Polar Front Jet and Subtropical Jet and the Associated Rainfall Anomalies over Eastern China in Summer
Publisher: American Meteorological Society
Abstract: o investigate the concurrent impacts of the East Asian polar front jet (EAPJ) and subtropical jet (EASJ) on the summer rainfall over eastern China, positive (strengthened EAPJ with weakened EASJ) and negative (weakened ...
The Impact of the East Asian Subtropical Jet and Polar Front Jet on the Frequency of Spring Persistent Rainfall over Southern China in 1997–2011
Publisher: American Meteorological Society
Abstract: pring persistent rainfall (SPR) over southern China has great impact on its society and economics. A remarkable feature of the SPR is high frequency. However, SPR frequency obviously decreases over the period of 1997?2011. ...
Separation of Traveling and Standing Waves in a Rigid-Walled Circular Duct Containing an Intermediate Impedance Discontinuity
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, we study the phenomenon of separation of traveling and standing waves in a one-dimensional rigid-walled circular duct. The underlying mechanism for separation, mode complexity, is linear and introduced here ...