Trajectory Control For Vehicles Entering The Earths Atmosphere At Small Flight Path Angles PDF Download

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Trajectory Control for Vehicles Entering the Earth's Atmosphere at Small Flight-path Angles

Trajectory Control for Vehicles Entering the Earth's Atmosphere at Small Flight-path Angles
Author: John M. Eggleston
Publisher:
Total Pages: 40
Release: 1961
Genre: Space vehicles
ISBN:

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Methods of controlling the trajectories of high-drag--low-lift vehicles entering the earth's atmosphere at angles of attack near 90° and at initial entry angles up to --3° are studied. The trajectories are calculated for vehicles whose angle of attack can be held constant at some specified value or can be perfectly controlled as a function of some measured quantity along the trajectory. The results might be applied in the design of automatic control systems or in the design of instruments which will give the human pilot sufficient information to control his trajectory properly during an atmospheric entry. Trajectory data are compared on the basis of the deceleration, range, angle of attack, and, in some cases, the rate of descent. The aerodynamic heat-transfer rate and skin temperature of a vehicle with a simple heat-sink type of structure are calculated for trajectories made with several types of control functions.


A Method for Longitudinal and Lateral Range Control for a High-drag Low-lift Vehicle Entering the Atmosphere of a Rotating Earth

A Method for Longitudinal and Lateral Range Control for a High-drag Low-lift Vehicle Entering the Atmosphere of a Rotating Earth
Author: John Worth Young
Publisher:
Total Pages: 32
Release: 1961
Genre: Trajectories
ISBN:

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A study has been made of a method for controlling the trajectory of a high-drag low-lift entry vehicle to a desired longitude and latitude on the surface of a rotating earth. By use of this control technique the vehicle can be guided to the desired point when the present position and heading of the vehicle are known and the desired longitude and latitude are specified. The present study makes use of a single reference trajectory and an estimate of the lift and side-force capabilities of the vehicle. This information is stored in a control-logic system and used with linear control equations to guide the vehicle to the desired destination. Results are presented of a number of trajectory studies which describe the operation of the control system and illustrate its ability to control the vehicle trajectory to the desired landing area.


NASA Technical Report

NASA Technical Report
Author:
Publisher:
Total Pages: 40
Release: 1961
Genre: Aerodynamics
ISBN:

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Re-entry and Planetary Entry Physics and Technology

Re-entry and Planetary Entry Physics and Technology
Author: W.H.T. Loh
Publisher: Springer Science & Business Media
Total Pages: 299
Release: 2013-11-11
Genre: Technology & Engineering
ISBN: 364250082X

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During the last decade, a rapid growth of knowledge in the field of re-entry and planetary entry has resulted in many significant advances useful to the student, engineer and scientist. The purpose of offering this course is to make available to them these recent significant advances in physics and technology. Accordingly, this course is organized into five parts: Part 1, Entry Dynamics, Thermodynamics, Physics and Radiation; Part 2, Entry Abla tion and Heat Transfer; Part 3, Entry Experimentation; Part 4, Entry Concepts and Technology; and Part 5, Advanced Entry Programs. It is written in such a way so that it may easily be adopted by other universities as a textbook for a two semesters senior or graduate course on the sub ject. In addition to the undersigned who served as the course instructor and wrote Chapters, 1, 2, 3 and 4, guest lecturers included: Prof. FRANKLIN K. MOORE who wrote Chapter 5 "Entry Radiative Transfer," Prof. SHIH-I PAI who wrote Chapter 6 "Entry Radiation-Magnetogasdy namics," Dr. CARL GAZLEY, J r. who wrote Chapter 7 "Entry Deaccelera [ion and Mass Change of an Ablating Body," Dr. SINCLAIRE M. SCALA who wrote Chapter 8 "Entry Heat Transfer and Material Response," Mr.