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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. ...
Mechanism of Tensile and Compressive Unequal Creep of Hydraulic Concrete Based on Variations in Pore Structure
Publisher: American Society of Civil Engineers
Abstract: AbstractTo elucidate the mechanism of tensile and compressive unequal specific creep of hydraulic
concrete, tensile and compressive cyclic loading and unloading creep tests were carried
out under uniform test conditions. ...
Experimental Study of Cyclic Loading and Unloading Creep of Hydraulic Concrete: A Statistical Perspective
Publisher: American Society of Civil Engineers
Abstract: AbstractConcrete is a complex composite material. Even if hydraulic concrete is creep-tested
under uniform test conditions, the magnitude relationship between the tensile and
compressive creep properties of concrete is ...
Assessing the Cracking Development of Ultrahigh-Performance Concrete Using Image Processing
Publisher: American Society of Civil Engineers
Abstract: AbstractUnderstanding the patterns and propagation of cracks on the surface of ultrahigh-performance
concrete (UHPC) is crucial for revealing the mechanisms of force transfer and failure
modes. Despite its significance, ...
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 ...
Investigation on Gradation Optimization Design of Basalt Fiber Asphalt Mixture Based on Discrete Element Simulation
Publisher: American Society of Civil Engineers
Abstract: AbstractBasalt fiber (BF) has proven effective in enhancing the performance of asphalt mixtures,
with fiber length being a critical influencing factor. However, the mechanistic relationship
between fiber length distribution ...
Rheological and Micro Properties of High-Viscosity Binder–Incorporated Polyphosphoric Acid and Rock Asphalt
Publisher: American Society of Civil Engineers
Abstract: AbstractTo enhance the performance of high-viscosity modified asphalt (HVMA), polyphosphoric
acid (PPA) and North American rock asphalt (NA–RA) were incorporated into styrene-butadiene-styrene
(SBS)/crumb rubber (CR) ...