Minimum Separation Distance Calculations for Incumbent Protection in LSA

2016 ◽  
pp. 116-128 ◽  
Author(s):  
Markku Jokinen ◽  
Marko Mäkeläinen ◽  
Tuomo Hänninen ◽  
Marja Matinmikko ◽  
Miia Mustonen
Keyword(s):  
Separation Distance ◽  
Minimum Separation

Determination of the Interference Distance Between Two Objects Using Optimization Techniques

1994 ◽  
Author(s):  
Meyer Nahon
Keyword(s):  
Optimization Problem ◽  
Accurate Determination ◽  
Separation Distance ◽  
Optimization Techniques ◽  
Robotic Systems ◽  
Separation Problem ◽  
Optimization Formulation ◽  
Minimum Separation ◽  
Two Bodies

Abstract The determination of the interference distance between objects is a problem encountered in the off-line simulation of robotic systems. It is similar to the problem of finding the minimum separation distance between two bodies — a problem which, at present, is commonly solved using optimization techniques. This paper presents an analogous optimization formulation for the quick and accurate determination of the interference distance between two interfering objects. The optimization problem consists of finding the maximum amount by which the boundaries of two interfering object can be moved back while still maintaining a non-empty interference volume. Since the approach used is similar to that used in the minimum separation problem, a single algorithm has been implemented which, given the position and orientation of two objects, will return the separation or interference distance between the objects, as appropriate.

scholarly journals Evaluation of pounding effects between reinforced concrete frames subjected to far-field earthquakes in terms of damage index

2021 ◽  
Author(s):  
S. H. Hosseini ◽  
H. Naderpour ◽  
R. Vahdani ◽  
R. Jankowski
Keyword(s):  
Reinforced Concrete ◽  
Damage Index ◽  
Seismic Intensity ◽  
Separation Distance ◽  
Coefficient Of Determination ◽  
Far Field ◽  
Concrete Frames ◽  
Rc Structures ◽  
Minimum Separation ◽  
Comparison Of The Results

AbstractIn this paper, three different damage indexes were used to detect nonlinear damages in two adjacent Reinforced Concrete (RC) structures considering pounding effects. 2-, 4- and 8-story benchmark RC Moment Resisting Frames (MRFs) were selected for this purpose with 60%, 75%, and 100% of minimum separation distance and also without any in-between separation gap. These structures were analyzed using the incremental dynamic analysis method under 44 far-field ground motion records. Comparison of the results between the MRFs with and without considering pounding effects show that collisions lead to a decrease in the values of coefficient of determination and the nonlinear damage occurs in lower seismic intensity. As a result, using the damage indexes, nonlinear damages can be detected during a specific seismic intensity. Moreover, considering a minimum separation distance leads to an increase in the coefficient of determination between the damage index and the maximum story drift ratio. Furthermore, due to pounding, shorter MRFs are damaged more significantly than the taller structures.

Analytical Evaluation of Warning Onset Rules for Lane Change Crash Avoidance Systems

1997 ◽  
Vol 41 (2) ◽  
pp. 949-953 ◽  
Author(s):  
Louis Tijerina ◽  
Shannon Hetrick
Keyword(s):  
Blind Spot ◽  
Separation Distance ◽  
Lane Change ◽  
Lateral Separation ◽  
Turn Signal ◽  
Signal Onset ◽  
Crash Avoidance ◽  
The Subject ◽  
Minimum Separation ◽  
Cas A

This study assessed the potential effectiveness of two warning onset rules for lane change Crash Avoidance Systems (CAS). A minimum-separation rule triggers a driver warning whenever the Subject Vehicle (SV) and Principal Other Vehicle (POV) are within some minimum lateral separation distance. A turn-signal onset rule triggers a driver warning when the driver activates the turn signal indicator and there is a vehicle in the blind spot. A software program to simulate lane change crashes determined the maximum time available for driver surprise reaction time to the warning and estimated the proportion of crashes avoided with each warning rule. Results indicate that the minimum separation rule is unlikely to be effective for lane change crash avoidance but may help prevent lane-drift-related crashes. The turn-signal onset rule will likely be effective for drivers who use their turn signals but is not free of nuisance alarm problems. Recommendations for lane change CAS research and development are provided.

scholarly journals Effect of passive coupling on seismic interaction optimization of adjacent structures

2021 ◽  
Vol 25 (1) ◽  
pp. 99-110
Author(s):  
Khadidja Reteri ◽  
Abdellatif Megnounif
Keyword(s):  
Numerical Study ◽  
Separation Distance ◽  
Flexible Structure ◽  
Seismic Events ◽  
Rigid Structure ◽  
The Past ◽  
Adjacent Buildings ◽  
Coupling System ◽  
Adjacent Structures ◽  
Minimum Separation

Abstract During the past few years, several studies have been conducted in various fields of civil engineering in order to design structures that can withstand the forces and deformations that might occur during seismic events. However, more recently, building adjacent structures close to each other and more resistant to earthquakes, provided with coupling systems, has been an issue of major concern. The effects of some parameters, such as the characteristics of adjacent structures and those of the coupling system, on the choice of the separation distance, were investigated using a program that was developed using MATLAB. This article aims to present a study that is intended to determine the parameters characterizing the coupling system. Moreover, the influence of rigidity of the structure was also examined. For this, three examples were investigated: a flexible structure, a rigid structure, and a very rigid structure. The results obtained from the numerical study made it possible to show that knowing the characteristics, number, and arrangements of the coupling systems can be used to find the minimum separation distance between two adjacent buildings.

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