Six-degree-of-freedom guidance and control-entry analysis of the HL-20

1993 ◽  
Vol 30 (5) ◽  
pp. 537-542 ◽  
Author(s):  
Richard W. Powell
Keyword(s):  
Degree Of Freedom ◽  
Guidance And Control ◽  
Six Degree Of Freedom ◽  
And Control

Active disturbance rejection guidance and control scheme for homing missiles with impact angle constraints

2018 ◽  
Vol 233 (3) ◽  
pp. 1133-1146
Author(s):  
Jian Hua Wang ◽  
Yuan Wen Cai ◽  
Long Cheng ◽  
Yan Li ◽  
Chao Jun Xin ◽  
...  
Keyword(s):  
Disturbance Rejection ◽  
Three Dimensional ◽  
Impact Angle ◽  
Degree Of Freedom ◽  
Guidance And Control ◽  
Active Disturbance Rejection ◽  
Control Scheme ◽  
Homing Missiles ◽  
Six Degree Of Freedom ◽  
And Control

An active disturbance rejection guidance and control scheme for homing missiles with three-dimensional impact angle constraints is proposed. The six-degree-of-freedom dynamical and kinematical models containing model uncertainties and disturbances are established. A strict feedback relative dynamics between the target and homing missile in three-dimensional space are deduced. A reconstructed reduced-order attitude controller design model is proposed. A two-loop control structure with respect to the centroid guidance loop and rotational control loop is conducted to implement the six-degree-of-freedom guidance and control system with the help of second-order sliding mode approach and extended state observers. The tracking loop of the Euler angles of the missile can be elided and the number of six-degree-of-freedom control parameters can be reduced. Finally, the effectiveness and robustness of the newly proposed guidance and control scheme are investigated and verified via six-degree-of-freedom nonlinear simulation studies.

A New Numerical Method for Simulation

SIMULATION ◽  
1965 ◽  
Vol 4 (5) ◽  
pp. 324-330 ◽  
Author(s):  
Maury E. Fowler
Keyword(s):  
Computer Program ◽  
Numerical Method ◽  
Degree Of Freedom ◽  
Root Locus ◽  
Guidance And Control ◽  
Bending Modes ◽  
Six Degree Of Freedom ◽  
And Control

This paper illustrates a method of digitally simulating the motion and control of vehicles. This method of simulation has been used for the simulation of a large variety of systems, including a six-degree-of- freedom simulation of Gemini reentry with guidance and control, a six-degree-of-freedom aircraft simula tion, missile control simulations including bending modes, trajectory problems, and many others. The major advantage of the method, in addition to the speed of computation, is that a detailed an alysis of the system is carried out during the develop ment of the simulation. Although, for small problems, simulations using this method can be derived by hand, large simula tions generally require a computer program to com pute root locus points and z-transforms.

scholarly journals Six-Degree-of-Freedom Digital Simulations for Missile Guidance and Control

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yongjie Xu ◽  
Zhijun Wang ◽  
Benbing Gao
Keyword(s):  
Degree Of Freedom ◽  
Test Time ◽  
Missile Guidance ◽  
Test Cycle ◽  
Guidance And Control ◽  
Ballistic Trajectory ◽  
Six Degree Of Freedom ◽  
Missile Test ◽  
And Control ◽  
Digital Simulations

Six-degree-of-freedom ballistic trajectory model can be used to verify design indicators, performance parameters, and correctness so they have been put forward in the missile argumentation and design process. Mathematical simulation is the basis of late semiphysical simulation and field firing testing, and it can greatly reduce the field shooting test time, which shortens the missile test cycle and so reduces costs.

Six Degree of Freedom Active Isolation in Flexible Supporting Structures: Numerical Simulation and Experiment

2003 ◽  
Author(s):  
Yuan Cheng ◽  
Qian Zhou ◽  
Ge-Xue Ren ◽  
Hui Zhang
Keyword(s):  
Stewart Platform ◽  
Degree Of Freedom ◽  
Active Isolation ◽  
Dynamics And Control ◽  
Six Degree Of Freedom ◽  
Multi Body ◽  
And Control ◽  
Flexible Cables ◽  
Base Platform ◽  
Supporting Structures

This paper studies the six degree-of-freedom active isolation of flexible supporting structures using Gough-Stewart platform. The problem arises from a large radio telescope in which the astronomical equipment is mounted on a platform to be stabilized, while the base platform of the mechanism itself is carried by a cable car moving along flexible cables. In this paper, the stabilization problem is equivalent to a dynamics and control problem of multi-body system. A control law of the prediction of the base platform and PD feedback is proposed for the six actuators of the Gough-Stewart platform. Based on numerical results, a model experimental setup has been built up. The control effects are measured with LTD 500 Laser Tracker.

Behavioral Stereotypes and Control Design Strategies for a Six-Degree-of-Freedom “Walking” Vehicle

1984 ◽  
Vol 28 (6) ◽  
pp. 492-496 ◽  
Author(s):  
Dennis B. Beringer ◽  
George R. Gruetzmacher ◽  
Naomi Swanson
Keyword(s):  
High Speed ◽  
Degree Of Freedom ◽  
Design Strategies ◽  
Foot Placement ◽  
Task Requirements ◽  
Turn Radius ◽  
Single Controller ◽  
Six Degree Of Freedom ◽  
And Control ◽  
Multiple Task

The problems posed by control of “walking” six-degree-of-freedom vehicles vary with specific task requirements. Different strategies are required for cruising “supervisory” control and precision foot placement. These, along with anthropometric and stereotypic considerations, directly affect the design of the manually operated controls and the degree to which multiple-axis/multiple-task integration can be achieved within a single controller. Systems that allow turn radius to be set in the absence of vehicle movement are best for planning and execution of slow close maneuvering while systems summing velocity vectors seem most advantageous for relatively high-speed cruise conditions.

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