scholarly journals A Centralized Algorithm with Collision Avoidance for Trajectory Planning in Preflight Stage

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zheng Xiang ◽  
Wenqi Zhang ◽  
Deyang He ◽  
Yu Tang
Keyword(s):  
Trajectory Planning ◽  
Performance Prediction ◽  
Processing System ◽  
Flight Performance ◽  
Flight Plan ◽  
Before And After ◽  
Convergence Point ◽  
Centralized Algorithm ◽  
Flight Route ◽  
Level Of Analysis

In order to better understand pretactical phase flow management with the flight plan centralized processing at its core, based on the flight plan centralized processing system and track-based operation, the aircraft’s 4D trajectory planning challenges require a deeper level of analysis. Firstly, through establishing a flight performance prediction model, in which the flight plan data is extracted and the time when an aircraft passed a specified waypoint is calculated, a 4D flight prediction can be derived. Secondly, the air traffic flow of the waypoint is calculated, and a converging point along a flight route is selected. Through adjusting the time and speed of the aircraft passing this point, conflict between aircraft is avoided. Finally, the flight is verified by CCA1532, with the connecting flight plan centralized processing center set in line with the company’s requirements. The results demonstrate that according to flight plans, the 4D trajectory of the aircraft can be predicted with the nearest minute and second, and the flow of a total of 20 aircraft within one hour before and after the passage of CCA1532 at key point WADUK can be calculated. When there is a conflict of 88 s between the convergence point and flight B, the speed of B aircraft is adjusted from 789 km/h to 778 km/h, and the time of passing the WADUK point is increased by 7 s, thereby realizing the conflict-free trajectory planning of the two flights.

Cuba Downs Cuban-American Small Planes; U.S. Responds with Further Sanctions

1996 ◽  
Vol 7 (3) ◽  
pp. 89-93
Keyword(s):  
National Security ◽  
Military Aircraft ◽  
Cuban American ◽  
Flight Plan ◽  
Flight Route

Ladies and gentlemen, I have just been briefed by the National Security Advisor on the shooting down today in broad daylight of two American civilian airplanes by Cuban military aircraft. We are continuing to investigate the circumstances of the incident, including the airplane's flight plan and the flight route and what, if any, warnings were given.

New atmospheric data model for constant altitude accelerated flight performance prediction calculations and flight trajectory optimization algorithms

2020 ◽  
pp. 095441002094555
Author(s):  
Radu I Dancila ◽  
Ruxandra M Botez
Keyword(s):  
Performance Prediction ◽  
Data Model ◽  
Trajectory Optimization ◽  
Computation Time ◽  
Atmospheric Parameter ◽  
Flight Performance ◽  
Flight Trajectory ◽  
Proposed Model ◽  
Atmospheric Data ◽  
Constant Altitude

This article presents a new method for storing and computing the atmospheric data used in time-critical flight trajectory performance prediction calculations, such as flight performance prediction calculations in flight management systems and/or flight trajectory optimization, of constant altitude cruise segments. The proposed model is constructed based on the forecast data provided by Meteorological Service Agencies, in a GRIB2 data file format, and the set of waypoints that define the lateral component of the evaluated flight profile(s). The atmospheric data model can be constructed/updated in the background or off-line, when new atmospheric prediction data are available, and subsequently used in the flight performance computations. The results obtained using the proposed model show that, on average, the atmospheric parameter values are computed six times faster than through 4D linear interpolations, while yielding identical results (value differences of the order of 10e−14). When used in flight trajectory performance calculations, the obtained results show that the proposed model conducts to significant computation time improvements. The proposed model can be extended to define the atmospheric data for a set of cruise levels (usually multiple of 1000 ft).

scholarly journals INTEGRATED ALGORITHM FOR COMPILINGAND ASSESSMENT OF DIRECT ROUTES RESTRICTIONS IN FREE ROUTE AIRSPACE OF UKRAINE

2021 ◽  
Vol 88 (3) ◽  
pp. 15-22
Author(s):  
Yuriy Chynchenko ◽  
Volodymyr Kharchenko
Keyword(s):  
Horizontal Plane ◽  
Vertical Plane ◽  
Processing System ◽  
The State ◽  
Flight Plan ◽  
Shortest Distance ◽  
State Boundary

The article describes the principles of acceptability assignment for direct routes restrictions in free route airspace of Ukraine for publication in Route Availability Document and further use by the Integrated Initial Flight Plan Processing System of Eurocontrol. The algorithms of correct generation of direct routes restrictions for the selected issues in a horizontal and vertical plane were proposed. As a main decision criteriafor these algorithms were chosen the shortest distance to the state boundary (in a horizontal plane) and space attitude (location) of aircraft (in avertical plane).

Kinematics Analysis and Trajectory Planning of Segmentation Robot for Chilled Sheep Carcass

2021 ◽  
Vol 37 (6) ◽  
pp. 1147-1154
Author(s):  
Xiulan Bao ◽  
Leng Junsong ◽  
Jincheng Mao
Keyword(s):  
Trajectory Planning ◽  
Automatic Segmentation ◽  
Three Dimensional ◽  
Animal Husbandry ◽  
List Type ◽  
Three Dimensional Model ◽  
Robot System ◽  
Contour Segmentation ◽  
Before And After ◽  
Cutting Path

HighlightsAn automatic sheep segmentation robot system was developed to realize the automatic segmentation of chilled sheep carcass and improve the segmentation efficiency.The mechanical properties of mutton and lamb ribs were analyzed.The motion model of robot was established and the cutting path of sheep carcass was designed.Accurate segmentation of sheep carcass was realized.Abstract. With the quick development of animal husbandry, it is imperative to switch from extensive management to intensive operation. To improve the automation and quality of mutton segmentation, an automatic sheep segmentation robot system was developed in this article, which realizes the automatic segmentation of chilled sheep carcass and improves the segmentation efficiency of chilled sheep carcass. According to the technological requirements of sheep carcass segmentation, the cutting procedure of slaughtering chilled fresh sheep carcass was designed and the three-dimensional model of chilled fresh sheep carcass was established in reverse. A chilled fresh sheep carcass clamp was designed based on the characteristics of the profiling structure. Then the mechanical characteristics of chilled fresh mutton and sheep ribs were analyzed. Specifically, considering that the carcass of chilled fresh sheep is a viscous body, the shear test of chilled fresh mutton tissue was carried out. Thus, the kinematics model of segmentation robot was established. The workspace of the slaughtering robot was analyzed. Furthermore, the dynamic model of a slaughtering robot was established. The cutting track of the segmentation robot was designed and the sheep carcass cutting experiment was completed on the segmentation robot system. The mass of sheep carcass before and after cutting were 15.3 and 14.9 kg, respectively. The loss rate during cutting was 2.61%, which indicates the incision was smooth and the sheep carcass segmentation was accurate. The effectiveness of the sheep carcass segmentation robot was proved by experimental results. Keywords: Cutting force, Reverse modeling, Sheep contour, Segmentation robot, Trajectory planning.

scholarly journals PERBAIKAN CITRA SINYAL ECG DENGAN METODE FINITE IMPULS RESPONSE FILTERING

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Hadi Purwanto ◽  
S El Yumin
Keyword(s):  
Digital Filter ◽  
Medical Instrument ◽  
Processing System ◽  
Software Tool ◽  
P Wave ◽  
Reference Channel ◽  
Interference Filters ◽  
The Poor ◽  
Before And After ◽  
Reduction Effect

The ECG is a medical instrument which is required by the medical check to obtain information about the humancardiac work function. The interference filtering grid is very important in measuring the results of biomedicalrecordings, especially in recording the poor ECG sinyals. The interference filters are available to the grid requiresa reference channel or a predetermined frequency is 50/60Hz. The method of noise reduction effect on the entiresinyal processing system appearance elektrocardio graph (ECG), with fundamental frequency 5 Hz to 100 Hz.Development of FIR digital filter has a very important role in this research to be able to view the complete ECGsinyal, such as the P wave, T and QRS waves in a complex with a different duration and amplitude with the help of acomplete design created in Matlab. The results show that the ECG sinyal before and after filtering with thefrequency spectrum clearly shows the reduction of interference grid on ECG sinyal. Analysis of the ECG sinyalshow in peiodic R wave peak was 1.62 mV, followed by waves P, Q and T 0.24 mV, respectively, 24%, and 0.1 to0.5 mV. Design of FIR that is deliberately chosen as a topic in this research, because it is a key material in thesinyal processing using Matlab software tool.

An Approximate Method for Jet Engines Flight Performances Prediction

2000 ◽  
Author(s):  
A. Ghenaiet
Keyword(s):  
Steady State ◽  
Approximate Method ◽  
Performance Prediction ◽  
Flight Performance ◽  
Jet Engines ◽  
Fast Simulation ◽  
Constant Power ◽  
Power Extraction ◽  
Simulation Procedure ◽  
Power Setting

This paper describes a fast simulation procedure to predict airbreathing engines steady state flight performances. This procedure uses an alternate method that works without the need of component maps and the corresponding matching. This method operates on simplified assumptions, such as constant power setting, without air bleed or power extraction. This approximate method for flight performance prediction is validated for three types of jet engines such as the P&W JT8D mixed flows turbofan, the GE CF6-80 high bypass turbofan. and the Russian double spool turbojet R11F-300.

Simulation and Design of Control and Display Unit for Full Flight Simulator

2014 ◽  
Vol 526 ◽  
pp. 273-276
Author(s):  
Zhi Jian Xiao ◽  
Jiang Jun Xu
Keyword(s):  
Design Methods ◽  
Flight Simulator ◽  
High Fidelity ◽  
Performance Parameters ◽  
Flight Plan ◽  
Display Unit ◽  
Reliable Performance ◽  
Simulator Design ◽  
Design Requirements ◽  
Flight Route

In order to solve the problem of simulation difficulty of the control and display unit (CDU) for full flight simulator, it is real significance to design the CDU. The principles and design methods are expounded about the CDU in detail. The simulation CDU is tested on full flight simulator. The results show that the simulation CDU can establish flight plan, modify flight route, and set the performance parameters. The component has correct logic, high fidelity and reliable performance. The simulation CDU can meet full flight simulator design requirements.

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