scholarly journals A Rapid Penetration Trajectory Optimization Method for Hypersonic Vehicles

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Binbin Yan ◽  
Ruifan Liu ◽  
Pei Dai ◽  
Muzeng Xing ◽  
Shuangxi Liu
Keyword(s):  
Trajectory Optimization ◽  
Optimization Method ◽  
Hypersonic Vehicle ◽  
Hypersonic Vehicles ◽  
Relaxation Techniques ◽  
Computational Performance ◽  
Second Order Cone ◽  
Ballistic Missiles ◽  
And Control

The evasion maneuver problem of hypersonic vehicles differs from those of ballistic missiles and other traditional weapons, showing distinctive properties including expansive maneuver range and weak maneuverability. How to avoid the disadvantage of low available overload and ensure follow-up tasks are the main concerns of the hypersonic penetration. This paper presents a penetration trajectory optimization algorithm for an air-breathing hypersonic vehicle, where the prerequisite penetration condition is analyzed and control costs are chosen as an objective function to minimize the fuel consumption and maneuver range. This paper focuses on how to formulate the complex, highly constrained nonconvex penetration problem to be a sequence of easily solved second-order cone programming through a combination of successive linearization and relaxation techniques. Innovation lies in the raising of the penetration angle and the relaxation technique of nonlinear and nonconvex elements. Various numerical simulations are conducted to verify the validity of penetration condition and to demonstrate that the proposed method is effective and has a good computational performance irrespective of initial guesses.

Personality and Relaxation Therapy: Changes among Clinical and Normal Subjects

1988 ◽  
Vol 66 (1) ◽  
pp. 283-289 ◽  
Author(s):  
Evelyn I. Bird ◽  
Vietta E. Wilson
Keyword(s):  
Normal Subjects ◽  
Relaxation Techniques ◽  
Relaxation Therapy ◽  
Demographic Information ◽  
State Trait Anxiety Inventory ◽  
Eysenck Personality Inventory ◽  
Few Data ◽  
And Control ◽  
Multiple Health

There are increasing numbers of self-referral stress-management programs, a few of which use group-relaxation techniques, but few data are available on the personalities of the symptomatic and asymptomatic clients who attend or on any changes in personality after the program. Scores on the Eysenck Personality Inventory, Multiple Health Locus of Control, and State-Trait Anxiety Inventory as well as demographic information were obtained from 255 adults who attended a 10-session, university-based, group-relaxation program. The symptomatic clients reported significantly less anxiety, less neuroticism, were more extraverted and ascribed less of their behavior to chance at a 1 month post-treatment follow-up than at intake. The small group of asymptomatic clients also reported less anxiety and neuroticism at the follow-up. There were no sex differences on the Eysenck inventory or the anxiety scales but there were for the Multiple Health internal and control scales. It was concluded that group relaxation appeared to improve mental health scores effectively for both stressed and nonstressed adults and that age was significantly related to some personality scores.

scholarly journals A Low-Order Partial Integrated Guidance and Control Scheme for Diving Hypersonic Vehicles to Impact Ground Maneuver Target

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Tong An ◽  
JianHua Wang ◽  
YuLong Pan ◽  
HaiShan Chen
Keyword(s):  
Analytical Model ◽  
Sliding Mode ◽  
Design Method ◽  
Hypersonic Vehicle ◽  
Hypersonic Vehicles ◽  
Dynamic Surface ◽  
Guidance And Control ◽  
Integrated Guidance And Control ◽  
And Control ◽  
Low Order

In this article, a low-order partial integrated guidance and control (PIGC) design method is proposed for diving hypersonic vehicles to impact ground maneuver target. A three-channel analytical model of body rates is deduced based on acceleration components of the hypersonic vehicle. By combining the analytical model of body rates and relative dynamic model between the hypersonic vehicle and target, three-channel commands of body rates are directly generated based on the extended state observer (ESO) technique, sliding mode control approach, and dynamic surface control theory in the guidance subsystem. In the attitude control subsystem, a sliding mode controller is designed to track the commands of body rates and generate commands of control surface fin deflections. By making full use of acceleration information of the hypersonic vehicle measured by the mounted accelerometer, the proposed PIGC design method provides a novel solution to compensate the unknown acceleration of the ground maneuver target. Besides, the order of design model is also reduced, and the design process is simplified. The effectiveness and robustness of the PIGC design method are verified and discussed by 6DOF simulation studies.

Trajectory Optimization Method for Follow-Up Control of Concrete Pump Truck

2013 ◽  
Vol 415 ◽  
pp. 3-8
Author(s):  
Da Wei Huang ◽  
Bai Yan Liu ◽  
Ru Wei Zhang
Keyword(s):  
Working Conditions ◽  
Trajectory Optimization ◽  
Optimization Method ◽  
Inverse Kinematic ◽  
Constrained Nonlinear Optimization ◽  
Optimization Function ◽  
Minimum Displacement ◽  
Concrete Pump Truck ◽  
Concrete Pump

The follow-up control of concrete pump truck is in order to solve the problem that whole boom follows the movement of boom end under the artificial traction. Focus on real-time detection of boom end azimuth change and inverse kinematic problems of redundant boom system, two-axis gravitational accelerometer is used to detect azimuthal variation of boom end, and the best motion trajectory of boom is determined by solving constrained nonlinear optimization function which takes minimum displacement distance of barycentre for the whole boom as the optimization goal. At last, relative azimuth and translation of boom end, rotation of boom are solved together to make translation and rotation of boom being synchronization. In this way to ensure whole boom follows the artificial traction in theory. In order to verify the discussion above, matlab is used to simulate several different working conditions for the follow-up control of boom.

Trajectory Optimization for Hypersonic Vehicle Satisfying Maneuvering Penetration

2011 ◽  
Vol 110-116 ◽  
pp. 5223-5231 ◽  
Author(s):  
Ke Nan Zhang ◽  
Wan Chun Chen
Keyword(s):  
Trajectory Optimization ◽  
Shooting Method ◽  
Control Variable ◽  
Optimization Method ◽  
Hypersonic Vehicle ◽  
Quadratic Program ◽  
Sqp Method ◽  
Piecewise Constant ◽  
Path Constraints ◽  
Direct Shooting

A trajectory optimization method for hypersonic vehicle in glide phase satisfying maneuvering penetration is proposed. Divide the dangerous zones that the hypersonic vehicle may encounter during glide phase into avoidable no-fly zones and avoidless no-fly zones. Take the avoidable no-fly zones as path constraints to join the trajectory optimization. To penetrate the avoidless no-fly zones, trajectory is programmed by some maneuvering policy. Direct shooting method is used to discretize the control variable to piecewise constant functions. So the optimal control problem is transferred to a nonlinear programming (NLP) problem, and solved by the serial quadratic program (SQP) method.

scholarly journals Literatur Review : Penerapan Teknik Relaksasi Genggam Jari Untuk Menurunkan Intensitas Nyeri Pada Pasien Pasca Operasi

2021 ◽  
Vol 1 ◽  
pp. 653-658
Author(s):  
Firda Nur Ayu Puspita Dewi ◽  
Nuniek Nizmah Fajriah
Keyword(s):  
Pain Management ◽  
Chief Complaint ◽  
T Test ◽  
Relaxation Techniques ◽  
Relaxation Therapy ◽  
Control Groups ◽  
Treatment Room ◽  
And Control ◽  
Paired T Test

AbstractPostoperative is a time since patient entered the recorvery room until the follow-up evaluation in the treatment room. Pain is the most chief complaint experienced by postoperative patiens. One of the non-pharmacological pain management is grip finger relaxation therapy. The study purpose was to describe the application of grip finger relaxation techniques to reduce pain in postoperative patients. The study was done by researched articles related to the intervention. The result showed that the pain decreased in the experiment and control groups was 2.44 and 3.2 respectively. By using the Paired T-test, the result shows there was a significant decreased of pain among experiment group (p-value0.000). As the conclusion, the grip finger relaxation technique is effective for reducing pain in postoperative patiens. As the suggestion, nurses can be taught to postoperative patients to reduce pain.Keywords: Pain; Postoperative; Grip finger relaxation AbstrakPasca Operasi yaitu massa dimana pasien mulai memasuki ruang pemulihan sampai evaluasi tindak lanjut diruang perawatan. Pasien pasca operasi pasti akan merasakan nyeri. Menejemen nyeri non farmakologis yang dapat mengatasi nyeri yaitu terapi relaksasi genggam jari. Tujuan karya tulis ilmiah ini yaitu untuk mengetahui gambaran mengenai penerapan teknik relaksasi genggam jari terhadap penurunan intensitas nyeri pasca operasi. Metode dilakukan dengan mencari beberapa jurnal penelitian tentang penerapan teknik relaksasi genggam jari terhadap penurunan intensitas nyeri post operasi. Hasil yang didapatkan setelah diberikan pada kelompok eksperimen dan kontrol memiliki rata-rata 2.44 dan 3.2, nilai Pvalue 0.000, 0.003 dengan P = <0.005 menggunakan alat uji Pairet T test. Simpulan karya tulis ilmiah ini yaitu teknik relaksasi genggam jari efektif untuk menurunkan nyeri pada pasien pasca operasi. Saran bagi perawat sekiranya bisa diajarkan kepada pasien pasca operasi untuk mengurangi nyeri.Kata kunci: Nyeri; Pasca operasi; Relaksasi genggam jari

Ascent Trajectory Optimization for Air-Breathing Hypersonic Vehicles Based on IGS-MPSP

2021 ◽  
Vol 01 (02) ◽  
pp. 2150010
Author(s):  
Lei Liu ◽  
Qianwei He ◽  
Bo Wang ◽  
Wenzhe Fu ◽  
Zhongtao Cheng ◽  
...  
Keyword(s):  
Computational Efficiency ◽  
Trajectory Optimization ◽  
Hypersonic Vehicles ◽  
Penalty Function Method ◽  
Control Input ◽  
Sensitivity Matrix ◽  
Decision Variables ◽  
Representation Technique ◽  
And Control ◽  
High Computational Efficiency

This paper proposes an improved Generalized Quasi-Spectral Model Predictive Static Programming (GS-MPSP) algorithm for the ascent trajectory optimization for hypersonic vehicles in a complex flight environment. The proposed method guarantees the satisfaction of constraints related to the state and control vector while retaining its high computational efficiency. The spectral representation technique is used to describe the control variables, which reduces the number of decision variables and makes the control input smooth enough. Through Taylor expansion, the constraints are transformed into an inequality containing only decision variables, such that it can be added into GS-MPSP framework. By Gauss quadrature collocation method, only a few collocation points are needed to solve the sensitivity matrix, which greatly accelerates the calculation. Subsequently, the analytical expression is obtained by combining the static optimization with the penalty function method. Finally, the simulation results demonstrate that the proposed improved GS-MPSP algorithm can achieve both high computational efficiency and high terminal precision under the constraints.

scholarly journals Hypersonic vehicle trajectory optimization and control

1997 ◽  
Author(s):  
S. Balakrishnan ◽  
J. Shen ◽  
J. Grohs ◽  
S. Balakrishnan ◽  
J. Shen ◽  
...  
Keyword(s):  
Trajectory Optimization ◽  
Hypersonic Vehicle ◽  
Optimization And Control ◽  
Vehicle Trajectory ◽  
And Control

scholarly journals Displaced Electric Sail Orbits Design and Transition Trajectory Optimization

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Naiming Qi ◽  
Mingying Huo ◽  
Qiufan Yuan
Keyword(s):  
Genetic Algorithm ◽  
Trajectory Optimization ◽  
Pseudospectral Method ◽  
Optimal Solution ◽  
Optimization Method ◽  
Solar Sails ◽  
Spherical Coordinate ◽  
Gauss Pseudospectral Method ◽  
Displaced Orbit ◽  
And Control

Displaced orbits for spacecraft propelled by electric sails are investigated as an alternative to the use of solar sails. The orbital dynamics of electric sails based spacecraft are studied within a spherical coordinate system, which permits finding the solutions of displaced electric sail orbits and optimize transfer trajectory. Transfer trajectories from Earth's orbit to displaced orbit are also studied in an optimal framework, by using genetic algorithm and Gauss pseudospectral method. The initial guesses for the state and control histories used in the Gauss pseudospectral method are interpolated from the best solution of a genetic algorithm. Numerical simulations show that the electric sail is able to perform the transfer from Earth’s orbit to displaced orbit in acceptable time, and the hybrid optimization method has the capability to search the feasible and optimal solution without any initial value guess.

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