scholarly journals Design of Roll Rate Estimator using GPS Signal for Spinning Vehicle

2016 ◽  
Vol 5 (3) ◽  
pp. 109-118 ◽  
Author(s):  
Sunyong Lee ◽  
Mihyun Jin ◽  
Heon Ho Choi ◽  
Sang Jeong Lee
Keyword(s):  
Roll Rate

Repeatable Dynamic Rollover Roof Test Fixture

2003 ◽  
Author(s):  
Donald Friedman ◽  
Acen Jordan ◽  
Carl Nash ◽  
Jack Bish ◽  
Terence Honikman ◽  
...  
Keyword(s):  
Longitudinal Axis ◽  
Rolling Motion ◽  
Passenger Compartment ◽  
Test Device ◽  
Test Fixture ◽  
Complete Vehicle ◽  
Entire Vehicle ◽  
Roll Rate ◽  
Drop Tests ◽  
The Impact

Experimental rollover tests have been criticized for their poor emulation of actual rollovers and for their lack of repeatability. We have designed and built a test fixture that overcomes both of these criticisms. The fixture holds a passenger compartment, weighted to match the inertia characteristics of a complete vehicle, or a complete vehicle at the appropriate pitch and yaw. The compartment is then rotated about its principal (longitudinal) axis through an arc that mimics the rolling motion of an entire vehicle. At the appropriate roll angle and falling velocity, the roof strikes a moving patch of concrete. The compartment is controlled throughout the sequence and is suspended after the impact, so that a sequence of impacts can be individually studied in separate tests. Initial tests have shown that we can achieve repeatable impacts. Test variables include pitch, yaw, roll rate and vehicle center of gravity motion (both lateral and vertical velocity). This test device addresses the various shortcomings of previous rollover tests, fixtures and the various static and drop tests of vehicles conducted to determine rollover performance.

scholarly journals Sensitivity Analysis and Flight Tests Results for a Vertical Cold Launch Missile System

Aerospace ◽  
2020 ◽  
Vol 7 (12) ◽  
pp. 168
Author(s):  
Robert Głębocki ◽  
Mariusz Jacewicz
Keyword(s):  
Vision System ◽  
Flight Test ◽  
Measurement Unit ◽  
Flight Tests ◽  
Test Range ◽  
Roll Rate ◽  
Six Degree Of Freedom ◽  
Main Engine ◽  
Missile Test ◽  
Missile System

In vertical cold launch the missile starts without the function of the main engine. Over the launcher, the attitude of the missile is controlled by a set of lateral thrusters. However, a quick turn might be disturbed by various uncertainties. This study discusses the problem of the influences of disturbances and the repeatability of lateral thrusters’ ignition on the pitch maneuver quality. The generic 152.4 mm projectile equipped in small, solid propellant lateral thrusters was used as a test platform. A six degree of freedom mathematical model was developed to execute the Monte-Carlo simulations of the launch phase and to prepare the flight test campaign. The parametric analysis was performed to investigate the influence of system uncertainties on quick turn repeatability. A series of ground laboratory trials was accomplished. Thirteen flight tests were completed on the missile test range. The flight parameters were measured using an onboard inertial measurement unit and a ground vision system. It was experimentally proved that the cold vertical launch maneuver could be realized properly with at least two lateral motors. It was found that the initial roll rate of the projectile and the lateral thrusters ‘igniters’ uncertainties could affect the pitch angle achieved and must be minimized to reduce the projectile dispersion.

scholarly journals Parameter Identification of Tractor-Semitrailer Model under Steering and Braking

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Yiming Li ◽  
Qin Shi ◽  
Duoyang Qiu
Keyword(s):  
Genetic Algorithm ◽  
Field Test ◽  
Test Data ◽  
Performance Testing ◽  
Roll Angle ◽  
Lookup Table ◽  
The Real ◽  
Yaw Rate ◽  
Roll Rate ◽  
Good Agreement

This paper describes a valuable linear yaw-roll tractor-semitrailer (TST) model with five-degree-of-freedom (DOFs) for control algorithm development when steering and braking. The key parameters, roll stiffness, axle cornering stiffness, and fifth-wheel stiffness, are identified by the genetic algorithm (GA) and multistage genetic algorithm (MGA) based on TruckSim outputs to increase the accuracy of the model. Thus, the key parameters of the simplified model can be modified according to the real-time vehicle states by online lookup table and interpolation. The TruckSim vehicle model is built referring to the real tractor (JAC-HFC4251P1K7E33ZTF6×2) and semitrailer (Luyue LHX9406) used in the field test later. The validation of the linear yaw-roll model of a tractor-semitrailer using field test data is presented in this paper. The field test in the performance testing ground is detailed, and the test data of roll angle, roll rate, and yaw rate are compared with the outputs of the model with maps of the key parameters. The results indicate that the error of the tractor’s roll angle and semitrailer’s roll angle between model data and test data is 1.13% and 1.24%, respectively. The roll rate and yaw rate of the tractor and semitrailer are also in good agreement.

The Effects of Simulator Delays on the Acquisition of Flight Control Skills: Control of Heading and Altitude

1987 ◽  
Vol 31 (11) ◽  
pp. 1286-1290 ◽  
Author(s):  
Gary E. Riccio ◽  
Jeffrey D. Cress ◽  
William V. Johnson
Keyword(s):  
Time Delay ◽  
Flight Control ◽  
Transfer Of Training ◽  
Delay Condition ◽  
Training Phase ◽  
Mean Square ◽  
Experimental Task ◽  
Performance Control ◽  
Control Behavior ◽  
Roll Rate

The effects of simulator delays on performance, control behavior, and transfer of training were investigated with a group of subjects who had no experience with flight control tasks. Two types of aircraft were simulated: one with highly responsive dynamics and one with sluggish dynamics. Subjects were assigned to one of four time-delay conditions and to one of the two aircraft types. In the first phase of the experiment, subjects participated in fifty trials (ten trials per day) with a particular time delay (50, 100, 200, or 400 milliseconds). After this “training” phase, all subjects “transferred” to the minimum time-delay condition (50 milliseconds) for another fifty trials. The experimental task required that the subjects maintain constant heading and altitude in the presence of pseudo-random roll-rate and pitch-rate disturbances. There were statistically significant effects of time delay on root-mean-square heading and altitude errors in both the training and transfer phases of the experiment. The effect of delay on transfer of training was greater for the aircraft with sluggish dynamics.

Effect of periodic roll rate in missiles with proportional navigation

1976 ◽  
Vol 13 (9) ◽  
pp. 547-556 ◽  
Author(s):  
J. Shinar ◽  
S. J. Merhav
Keyword(s):  
Proportional Navigation ◽  
Roll Rate

LQG Control Design for Vehicle Active Anti-Roll Bar System

2014 ◽  
Vol 663 ◽  
pp. 146-151 ◽  
Author(s):  
Noraishikin Zulkarnain ◽  
Hairi Zamzuri ◽  
Saiful Amri Mazlan
Keyword(s):  
Ride Comfort ◽  
Simulation Analysis ◽  
Control Strategies ◽  
Dynamic Modelling ◽  
Linear Quadratic Regulator ◽  
Vehicle Body ◽  
Linear Quadratic ◽  
Linear Quadratic Gaussian ◽  
Roll Rate ◽  
External Forces

The objective of this paper is to design a linear quadratic regulator (LQR) and linear quadratic Gaussian (LQG) controllers for an active anti-roll bar system. The use of an active anti-roll bar will be analysed from two different perspectives in vehicle ride comfort and handling performances. This paper proposed the basic vehicle dynamic modelling with four degree of freedom (DOF) on half car model and are described that show, why and how it is possible to control the handling and ride comfort of the car, with the external forces also control strategies on the front anti-roll bar. By simulation analysis, the design model is validity and the performance under control of linear quadratic regulator (LQR) and linear quadratic Gaussian (LQG) controller are achieved. Both two controllers are modeled in MATLAB/SIMULINK environment. It has to be determined which control strategy delivers better performance with respect to roll angle and the roll rate of half vehicle body. The result shows, however, that LQG produced better response compared to a LQR strategy.

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