scholarly journals Control Signal Analysis of Four Ring Space Stabilized Platform

2022 ◽  
Vol 2160 (1) ◽  
pp. 012025
Author(s):  
Minghao Gao ◽  
Yunhui Ning ◽  
Yujie Wang ◽  
Gaoling Song ◽  
Zhipeng Zheng
Keyword(s):  
Signal Analysis ◽  
Research Method ◽  
Spatial Layout ◽  
Stability Control ◽  
Physical Design ◽  
Control Signal ◽  
Control Loop ◽  
Control Signals ◽  
Stabilized Platform ◽  
Ring Space

Abstract In order to build a four ring space stable platform using free rotor gyroscope, the spatial layout of gyroscope and frame axis should be briefly analyzed, and the installation shafting should be orthogonal or perpendicular to each other to facilitate control and decoupling. On this basis, through the sensitive angle analysis of gyro and frame shafting, the control signals acting on each frame are deduced. Finally, through the physical design of the control loop of the space stability platform, the correctness of the research method and design form is demonstrated, which has theoretical guiding significance for the design of the space stability control loop.

scholarly journals SETTING PERILAKU DALAM EVALUASI PURNA HUNI (EPH) GEDUNG DIREKTORAT POLITEKNIK NEGERI PONTIANAK

2020 ◽  
Vol 7 (2) ◽  
pp. 134
Author(s):  
Ferry Kurniadi ◽  
Dian Perwita Sari ◽  
Taufik Wibowo
Keyword(s):  
Qualitative Research ◽  
Research Method ◽  
Personal Space ◽  
Spatial Layout ◽  
Building Performance ◽  
Behavioral Factors ◽  
Post Occupancy Evaluation ◽  
Behavior Setting ◽  
Spatial Performance ◽  
Behavior Settings

Gedung Direktorat merupakan wajah depan kampus yang memberikan citra bagi kampus tersebut. Gedung Direktorat Politeknik Negeri Pontianak adalah bangunan yang pada perkembangannya mengalami penurunan kualitas fisik bangunan. Penurunan performa bangunan tersebut dilihat terutama terlihat dari aspek perilaku (behavior), sehingga diperlukanlah sebuah evaluasi purna huni (EPH) untuk menilai performasi aspek tersebut. Penelitian ini bertujuan mengidentifikasi performansi dari aspek perilaku yang dibentuk oleh tata layout ruang pada Gedung Direktorat Politeknik Negeri Pontianak yang kemudian dianalisa untuk mendapatkan temuan yang dapat digunakan untuk perencanaan dan redesain pembangunan gedung ini di masa yang akan datang. Metode yang akan digunakan adalah metode penelitian kualitatitif yang dilakukan secara investigatif dengan menggunakan analisa metode pemetaan perilaku berupa person centered mapping, place centered mapping, physical trace. Hasil dari penelitian ini berupa penilaian terhadap performansi ruang yang ditimbulkan akibat setting perilaku yang dilihat dari pemetaan perilaku berupa teritori, ruang personal dan privasi. Setting perilaku pada bangunan dipengaruhi oleh pergerakan pengguna dan aksesbilitas di dalam bangunan BEHAVIOR SETTING IN POST OCCUPANCY EVALUATION (POE) OF DIRECTORATE OF PONTIANAK STATE POLYTECHNIC BUILDINGThe Directorate Building is the front facade of the campus, which gives an image for the whole campus. Pontianak State Polytechnic Directorate Building in its development experienced a decreasing quality. One of the declines in building performance could see from the behavior aspect, so it needs a post-occupancy evaluation (POE) to assess this aspect's performance. This study aims to identify the performance of behavioral factors forming by the spatial layout in the Pontianak State Polytechnic Directorate Building, then analyzed to obtain findings that could use to plan and redesign this building in the future. The research method is a qualitative research method, carried out investigative using analysis of behavioral mapping methods such as person-centered mapping, place centered mapping, and physic trace. The result of this study is an assessment of the spatial performance that results from the behavior setting that seeing from the behavior mapping like territory, personal space, and privacy. Behavior settings influenced by the user movement and accessibility within the building. 

Design of Improved Disturbance Observer for Stabilized Platform Servo System

2013 ◽  
Vol 300-301 ◽  
pp. 1209-1213
Author(s):  
Jian Shan Lu ◽  
Chang Ming Wang ◽  
Ai Jun Zhang ◽  
Xiang Fei Meng
Keyword(s):  
Robust Stability ◽  
Disturbance Observer ◽  
Servo System ◽  
Control Signal ◽  
Measurement Noise ◽  
Tracking Performance ◽  
External Disturbances ◽  
Additional Control ◽  
Simulation Results ◽  
Stabilized Platform

In order to reduce the influence of frictional interference and measurement noise on stabilized platform tracking performance, disturbance observer (DOB) is applied to platform servo system. In view of the non-ideal performance of classical disturbance observer about suppressing measurement noise, a novel improved DOB which uses an additional control signal to compensate system outputs is proposed based on the structure of classical DOB, and robust stability of the improved DOB when existing model perturbation is analyzed in detail. Simulation results show that the improved DOB can suppress external disturbances and model perturbation well, and the suppression performance of measurement noise is improved, too.

Effectiveness of the eastern grey kangaroo foot thump for deterring conspecifics

2005 ◽  
Vol 32 (7) ◽  
pp. 649 ◽  
Author(s):  
Helena Bender
Keyword(s):  
Background Noise ◽  
Noise Control ◽  
Control Signal ◽  
Wild Populations ◽  
Target Species ◽  
Primary Industry ◽  
Control Signals ◽  
Grey Kangaroo ◽  
Natural Sound

Overabundant wild populations of herbivores often present challenges to primary industry, competing with stock, and damaging crops and property. Eastern grey kangaroos (Macropus giganteus) are one of seven macropodid species that are considered a problem in agriculture in Australia. Most deterrent devices available commercially use sounds that do not occur in nature (i.e. artificial sounds), which often have a short-lived or no effect on the target species, whereas trials with biologically significant sounds are often more effective and provide greater resistance to habituation. I used a playback trial of an eastern grey kangaroo foot thump, a biologically significant signal that is given in response to a predator and is usually followed by flight. I determined its effectiveness compared with a recording of background noise (control) for deterring kangaroos over a seven-week period. Kangaroos significantly increased their vigilance levels in response to the foot thump, but not in response to the control signal. Just over 60% of kangaroos took flight in response to the foot thump and the control signals, but more kangaroos took flight in the first 3 s when the foot thump was played. The foot thump shows potential as a deterrent of eastern grey kangaroos for primary industry, and is less likely to suffer from habituation because it is a natural sound.

scholarly journals PERLINDUNGAN LAHAN PERTANIAN DALAM MENGANTISIPASI ALIH FUNGSI TANAH AKIBAT PENGADAAN TANAH BAGI PEMBANGUNAN

2015 ◽  
Vol 92 ◽  
Author(s):  
Rahayu Subekti , ◽  
Winarno Budyatmojo ,
Keyword(s):  
Research Method ◽  
Food Product ◽  
Spatial Layout ◽  
Land Policy ◽  
Sustainable Food ◽  
Local Regulation ◽  
Land Protection ◽  
Toll Road ◽  
Descriptive Approach ◽  
Land Control

<h4>Abstract</h4> <p><strong><em> </em></strong></p> <p><em>The objective of research was to anticipate and to analyze the Farming Land Protection in Anticipating the Land Function Shift Due to Land Procurement for Development. The problem of farming land compensation is an urgent to organize recalling that land procurement cases for development occurs widely and results in reduced farming land leading to decreased food product. The research method employed in this research was juridical sociological one with descriptive approach. Considering the result of research: The construction toll road in Sragen Regency involved farming and non-farming lands. Compensation was so far given in the form of money, cash and carry, corresponding to the agreement between land procurement committee and land owner. The sustainable food farming land policy was accommodated through local legal instrument, Local Regulation Number 11 of 2011 about Spatial Layout of Sragen Regency Area in 2011-2031, within which there was farming allocation area. The local Government of Sragen Regency should make policy on sustainable food farming land control.</em><em> </em></p> <p><strong><em>Keywords: </em></strong><em>Farming Land Protection, Land Function Shift, Land Procurement.</em><em> </em></p> <p><em> </em></p> <h3>Abstrak</h3> <p>Tujuan penelitian ini untuk mengetahui dan menganalisa Perlindungan Lahan Pertanian Dalam Men- gantisipasi Alih Fungsi Tanah Akibat Pengadaan Tanah Bagi Pembangunan. Persoalan kompensasi lahan pertanian merupakan hal yang urgen untuk ditata mengingat kasus-kasus pengadaan tanah untuk pembangunan banyak terjadi dan menyebabkan berkurangnya lahan pertanian sehingga akan mengu- rangi produk pangan. Metode penelitian yang digunakan dalam penelitian ini adalah yuridis sosiologis dengan pendekatan diskriptif. Berdasarkan hasil penelitian menunjukkan dalam Pembangunan jalan Tol di Kabupaten Sragen meliputi tanah pertanian dan tanah non pertanian . Pemberian ganti rugi se- lama ini di berikan dalam bentuk uang , cash dan carry sesuai dengan kesepakatan antara pihak panitia pengadaan tanah dengan pemilik tanah. Kebijakan lahan pertanian pangan berkelanjutan diakomodir melalui instrumen hukum Daerah yaitu Peraturan Daerah Nomor 11 Tahun 2011 tentang Rencana Tata Ruang Wilayah Kabupaten Sragen Tahun 2011-2031 , yang didalamnya terdapat kawasan peruntukan pertanian. Hendaknya Pemerintah Daerah Kabupaten Sragen perlu mengambil kebijakan pengendalian lahan pertanian pangan berkelanjutan</p> <strong>Kata Kunci: </strong>Perlindungan Lahan pertanian, Alih Fungsi Tanah, Pengadaan tanah

scholarly journals Digital Watermarks with Adaptive Information Ring Width in the Issue of Hidden Transmission of a Control Signal in the Multi-Target Robotic System

2020 ◽  
Vol 24 (2) ◽  
pp. 136-152
Author(s):  
O. O. Shumskaya ◽  
A. О. Iskhakova
Keyword(s):  
Ring Width ◽  
Digital Watermark ◽  
Robotic System ◽  
Control Signal ◽  
Image Rotation ◽  
Control Signals ◽  
Multi Agent ◽  
Digital Watermarks ◽  
Transmitted Signal ◽  
Hidden Data

Purpose of research. The article is devoted to the issue of ensuring the safe transmission of control signals between the elements of a multi-agent robotic system. The purpose of the work is to provide hidden data transmission with the possibility of unambiguous extraction of control signals.Methods. To solve the task set, an algorithm based on the methods of digital watermarks and digital steganography was proposed. The method of forming a digital watermark in the form of a ring with symmetry allows not only ensuring maximum imperceptibility of embedding (insignificant distortion of the container during concealment), but also to protect the transmitted signal from such complex distortions as image rotation. The steganographic concealment method allows regulating the intensity of embedding using the force factor; it is computationally simple and straightforward. The proposed approach to identifying and understanding the transmitted signal differs from modern methods of cryptography and steganalysis in that it does not require 100% correct signal extraction. After several modifications, the method allows minimizing the time spent on formation (adaptive width of the ring with signal bits) and embedding of a digital watermark (minimization of the processed area of the container for embedding).Results. The proposed approach makes it possible to transmit control signals in a hidden way within the framework of the transmission of digital objects; the conducted experiments have shown that the control signal is unambiguously understood even with such distortions as a decrease or increase in contrast or brightness, image rotation, and compression.Conclusion. Application of the proposed technique for transmitting control signals in a multi-agent robotic system will male it possible to receive the necessary information timely and safe, with a minimum probability of loss.

scholarly journals Optimisation of Energy Use in Bioethanol Production Using a Control Algorithm

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 282
Author(s):  
Jarosław Knaga ◽  
Stanisław Lis ◽  
Sławomir Kurpaska ◽  
Piotr Łyszczarz ◽  
Marcin Tomasik
Keyword(s):  
Energy Consumption ◽  
Pid Controller ◽  
Control Algorithm ◽  
Control Signal ◽  
Control Algorithms ◽  
Signal Quality ◽  
Control Signals ◽  
And Control ◽  
Rectification Process

In this work, the possibility of limiting energy consumption in the manufacturing process of bioethanol to obtain biofuel was analysed. For this purpose, a control algorithm has been optimised while retaining the good quality of the control signals. New in this study is the correlation of the control algorithm not only with the signal’s quality, but also with the energy consumption in such an energy-intensive process as rectification. The rectification process in a periodic production system has been researched. The process was modelled on a test station with the distillation mixture capacity of 25 dm3. For the optimization, the following control algorithms have been applied: relay, PID and PID after modification to I-PD. The simulation was carried out on a transfer function model of the plant that has been verified on a real object, a rectification column. The simulations of energy consumption and control signal’s quality have been carried out in the Matlab®-Simulink environment after implementing the model of the research subject and control algorithms. In the simulation process, an interference signal with an amplitude of 3% and frequency of 2 mHz was used. The executed analyses of the control signal quality and the influence of the control algorithm on the energy consumption has shown some essential mutual relationships. The lowest energy consumption in the rectification process can be achieved using the I-PD controller—however, the signal quality deteriorates. The energy savings are slightly lower while using the PID controller, but the control signal quality improves significantly. From a practical point of view, in the considered problem the best control solution is the classic PID controller—the obtained energy effect was only slightly lower while retaining the good quality of the control signals.

Extracting Initial Iterative Control Signal Based on Trajectory Primitives Matching and Combining

2017 ◽  
Vol 21 (2) ◽  
pp. 228-234
Author(s):  
Jianming Xu ◽  
◽  
Lingxin Kong ◽  
Yaodong Wang
Keyword(s):  
Iterative Learning Control ◽  
Similarity Index ◽  
Control Signal ◽  
Optimal Matching ◽  
B Splines ◽  
Control Information ◽  
Control Signals ◽  
Primitive Sequences ◽  
Definition Of ◽  
Iterative Control

The initial iterative control signal is often adopted a zero or a certain value in the conventional iterative learning control (ILC) system, and an ILC process needs to renew again as long as the desired trajectory is changed. In this paper, the NURBS (Non-Uniform Rational B-Splines) model is used for describing all trajectory primitives and the desired trajectory. It is studied that the problem of the initial iterative control signal is extracted in ILC, which presents a method of extracting the initial iterative control signal based on the trajectory primitive optimal matching and combining algorithm. Firstly, the definition of the similarity index between the two different spacial trajectories is introduced. Secondly, an optimal matching and combining algorithm is designed under a certain similarity index, which is used to find two or more combined primitive sequences with space patterns similar to the desired trajectory. Thirdly, the initial iterative control signals of the desired trajectory are extracted by using the control information of the combined primitive sequences. Finally, the simulation is carried out to demonstrate the effectiveness of the present method.

scholarly journals Control Requirements for Future Gas Turbine-Powered Unmanned Drones: JetQuads

2018 ◽  
Vol 8 (12) ◽  
pp. 2675 ◽  
Author(s):  
Soheil Jafari ◽  
Seyed Miran Fashandi ◽  
Theoklis Nikolaidis
Keyword(s):  
Gas Turbine ◽  
Health And Safety ◽  
Fire Detection ◽  
Stability Control ◽  
Vital Role ◽  
Optimal Operation ◽  
Control Mode ◽  
Main Body ◽  
Control Loop ◽  
Mode Identification

The next generation of aerial robots will be utilized extensively in real-world applications for different purposes: Delivery, entertainment, inspection, health and safety, photography, search and rescue operations, fire detection, and use in hazardous and unreachable environments. Thus, dynamic modeling and control of drones will play a vital role in the growth phase of this cutting-edge technology. This paper presents a systematic approach for control mode identification of JetQuads (gas turbine-powered quads) that should be satisfied simultaneously to achieve a safe and optimal operation of the JetQuad. Using bond graphs as a powerful mechatronic tool, a modular model of a JetQuad including the gas turbine, electric starter, and the main body was developed and validated against publicly available data. Two practical scenarios for thrust variation as a function of time were defined to investigate the compatibility and robustness of the JetQuad. The simulation results of these scenarios confirmed the necessity of designing a compatibility control loop, a stability control loop, and physical limitation control loops for the safe and errorless operation of the system. A control structure with its associated control algorithm is also proposed to deal with future challenges in JetQuad control problems.

Sign in / Sign up

Export Citation Format

Share Document