scholarly journals Study on the Sensitivity of a Gyroscope System Homing a Quadcopter onto a Moving Ground Target under the Action of External Disturbance

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1696
Author(s):  
Izabela Krzysztofik ◽  
Zbigniew Koruba

This paper investigates the sensitivity (resistance) of a quadcopter on-board gyroscope system for the observation and tracking of a moving ground target to changing parameters of its regulator under interference conditions. It was shown that the gain in matrix elements is most sensitive, and even their slightest deviation from optimal values can lead to reduced target tracking efficiency and even loss of control system stability. Furthermore, the authors studied the energy expenditure at various gyroscope system control parameter values, while homing a quadcopter onto a ground target. A Matlab/Simulink environment was used to conduct simulations of the controlled gyroscope system dynamics. Selected test results are shown in graphic form.

Author(s):  
Zain Anwar Ali ◽  
Dao Bo Wang ◽  
Muhammad Aamir

<span>Research on the tri-rotor aerial robot is due to extra efficiency<span> over other UAV’s regarding stability, power and size<span> requirements. We require a controller to achieve 6-Degree<span> Of Freedom (DOF), for such purpose, we propose the RST<span> controller to operate our tri-copter model. A MIMO model<span> of a tri-copter aerial robot is challenged in the area of control<span> engineering. Ninestates of output control dynamics are treated<span> individually. We designed dynamic controllers to stabilize the<span> parameters of an UAV. The resulting system control algorithm<span> is capable of stabilizing our UAV to perform numerous<span> operations autonomously. The estimation and simulation<span> implemented inMATLAB, Simulink to verify the results. All<span> real flight test results are presented to prove the success of<span> the planned control structure.<br /><br class="Apple-interchange-newline" /></span></span></span></span></span></span></span></span></span></span></span></span></span></span>


2020 ◽  
Vol 5 (1) ◽  
pp. 74
Author(s):  
Ariyetti Ariyetti ◽  
Malse Anggia ◽  
Ruri Wijayanti

<p>Air limbah industri tahu berpotensi mencemari lingkungan, maka sebelumnya perlu dilakukan pengolahan sebelum dibuang ke lingkungan. Dimana salah satu upaya awal untuk menangani hal tersebut dengan melakukan penelitian. Penelitian ini bertujuan untuk mengidentifikasi cemaran air limbah industri tahu terutama di Kecamatan Nanggalo Kota Padang. Metoda penelitian dilakukan dengan mengambil sampel air limbah industri tahu pada dua lokasi dan dua titik pengambilan sampel untuk masing-masing lokasi, yaitu didekat tempat pembuangan air limbah dan yang berdekatan dengan tempat tinggal masyarakat. Parameter pengujiannya meliputi : <em>BOD</em>, <em>COD</em>, pH, <em>TSS</em>, N-NH<sub>3</sub>, dan N-Total. Hasil pengujian pada lokasi pertama dan titik pertama, nilai parameter secara berurutan dari BOD, COD, pH, TSS, N-NH<sub>3</sub> dan N-Total adalah 226 mg/L; 387 mg/L; 5,10; 156 mg/L; 2,20 mg/L dan 2,54 mg/L, sedangkan pada titik kedua nilainya 153 mg/L; 287 mg/L; 5,82; 128 mg/L; 1,17 mg/L dan 2,02 mg/L. Kemudian pada lokasi kedua dan titik pertama nilai nya secara berurutan, yaitu 154 mg/L; 282 mg/L; 4,87; 120 mg/L; 2,06 mg/L dan 2,76 mg/L, sedangkan pada titik kedua nilainya 121 mg/L; 234 mg/L; 5,11; 88 mg/L; 1,24 mg/L dan 1,67 mg/L. Hasil yang didapatkan menunjukkan kondisi air limbah tahu dengan parameter pH pada semua lokasi dan titik  melewati batas baku mutu yang diizinkan menurut Permen Lingkungan Hidup No.5 Tahun 2014 tentang Baku Mutu Air Limbah Bagi Usaha dan/atau Kegiatan Pengolahan Kedelai.</p><p> </p><p>Tofu industry wastewater has the potential to pollute the environment, so it needs to be trated before it is discharged into the environment. Where is one of the initial efforts to deal with this by conducting research. This study aims to identify tofu industry wastewater contamination, especially in Nanggalo District, Padang City. The research method is carried out by taking tofu industrial wastewater samples at two locations and two sampling points for each location and two sampling points for each location, which are near the waste water disposal site and which is adjacent to the community residence. The testing parameters include : BOD, COD, pH, TSS, N-NH<sub>3</sub> and N-Total. The test results at the first location and first point, the parameter values in arrow of BOD, COD, pH, TSS, NH<sub>3</sub> and N-Total are 226 mg/L; 387 mg/L; 5,10; 156 mg/L; 2,20 mg/L and 2,54 mg/L, while at the second point the value is 153 mg/L; 287 mg/L; 5,82; 128 mg/L; 1,17 mg/L and 2,02 mg/L. Then  at the second location and the first point the values are in sequence, which is 154 mg/L; 282 mg/L; 4,87; 120 mg/L; 2,06 mg/L and 2,76 mg/L, while at the second point the value is 121 mg/L; 234 mg/L; 5,11; 88 mg/L; 1,24 mg/L and 1,67 mg/L. The results obtained indicate the condition of tofu wastewater with pH parameters at all location and the point of exceeding the permitted quality standard according to Environmental Regulation No.5 of 2014 concerning Wastewater Quality Standars for Soybean Business and / or Processing Activities.</p>


This paper aims produce an academic scheduling system using Genetic Algorithm (GA) to solve the academic schedule. Factors to consider in academic scheduling are the lecture to be held, the available room, the lecturers and the time of the lecturer, the suitability of the credits with the time of the lecture, and perhaps also the time of Friday prayers, and so forth. Genetic Algorithms can provide the best solution for some solutions in dealing with scheduling problems. Based on the test results, the resulting system can automate the scheduling of lectures properly. Determination of parameter values in Genetic Algorithm also gives effect in producing the solution of lecture schedule


2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Shumin Jiang ◽  
Fei Xu ◽  
Zhanwen Ding ◽  
Chen Yang ◽  
Huanhuan Liu

Two different time delay structures for the dynamical Cournot game with two heterogeneous players are considered in this paper, in which a player is assumed to make decision via his marginal profit with time delay and another is assumed to adjust strategy according to the delayed price. The dynamics of both players output adjustments are analyzed and simulated. The time delay for the marginal profit has more influence on the dynamical behaviors of the system while the market price delay has less effect, and an intermediate level of the delay weight for the marginal profit can expand the stability region and thus promote the system stability. It is also shown that the system may lose stability due to either a period-doubling bifurcation or a Neimark-Sacker bifurcation. Numerical simulations show that the chaotic behaviors can be stabilized by the time-delayed feedback control, and the two different delays play different roles on the system controllability: the delay of the marginal profit has more influence on the system control than the delay of the market price.


2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Binbin Pei ◽  
Haojun Xu ◽  
Yuan Xue

Current fight boundary of the envelope protection in icing conditions is usually defined by the critical values of state parameters; however, such method does not take the interrelationship of each parameter and the effect of the external disturbance into consideration. This paper proposes constructing the stability boundary of the aircraft in icing conditions through analyzing the region of attraction (ROA) around the equilibrium point. Nonlinear icing effect model is proposed according to existing wind tunnel test results. On this basis, the iced polynomial short period model can be deduced further to obtain the stability boundary under icing conditions using ROA analysis. Simulation results for a series of icing severity demonstrate that, regardless of the icing severity, the boundary of the calculated ROA can be treated as an estimation of the stability boundary around an equilibrium point. The proposed methodology is believed to be a promising way for ROA analysis and stability boundary construction of the aircraft in icing conditions, and it will provide theoretical support for multiple boundary protection of icing tolerant flight.


2008 ◽  
Vol 25 (No. 5) ◽  
pp. 249-258
Author(s):  
I. Švec ◽  
M. Hrušková ◽  
O. Jirsa

The effects of wheat cultivar and harvest year on the wheat technological quality were studied by univariate and multivariate statistical methods. Two wheat varieties sown in the harvest years 2003–2005 were used, the first one of European (cultivar Bezostaja, RUS), the second one of American origin (cultivar Jagger, USA). The evaluated parameter values indicated otherness of technological quality of the varieties studied, mostly in the milling effectivity and in proteins contents and quality. Principal component analysis (PCA) results suggested these differences, but their verifiability based on ANOVA testing was not proved. The harvest year mostly affected also the milling quality and alveograph parameters. The baking test results were not affected by either of both effects studied. The crop of 2003 had higher proximity to the crop of 2004 than to that of 2005. Multivariate analysis (cluster analysis; CA), was used to evaluate the interaction between the wheat cultivar and harvest year effects. In comparison of these effects rate, the technological quality of American cultivar Jagger was strongly influenced by the cultivar (with exception of Falling Number and gases volume). In contrast, the quality of the European wheat cultivar Bezostaja depended significantly on the harvest year.


Robotica ◽  
2020 ◽  
pp. 1-13
Author(s):  
Xiong Lu ◽  
Beibei Qi ◽  
Hao Zhao ◽  
Junbin Sun

SUMMARY Rendering of rigid objects with high stiffness while guaranteeing system stability remains a major and challenging issue in haptics. Being a part of the haptic system, the behavior of human operators, represented as the mechanical impedance of arm, has an inevitable influence on system performance. This paper first verified that the human arm impedance can unconsciously be modified through imposing background forces and resist unstable motions arising from external disturbance forces. Then, a reliable impedance tuning (IT) method for improving the stability and performance of haptic systems is proposed, which tunes human arm impedance by superimposing a position-based background force over the traditional haptic workspace. Moreover, an adaptive IT algorithm, adjusting the maximum background force based on the velocity of the human arm, is proposed to achieve a reasonable trade-off between system stability and transparency. Based on a three-degrees-of-freedom haptic device, maximum achievable stiffness and transparency grading experiments are carried out with 12 subjects, which verify the efficacy and advantage of the proposed method.


2012 ◽  
Vol 463-464 ◽  
pp. 1663-1667
Author(s):  
Hai Na Hu ◽  
Wu Wang

Automatic Voltage Regulator (AVR) was applied to hold terminal voltage magnitude of a synchronous generator at a specified level and its stability seriously affects the security of power system. PID control was applied for AVR system control, but the parameters of PID controller were hard to determine, to overcome this problem, some intelligent techniques should be taken. Wavelet Neural Network (WNN) was constrictive and fluctuant of wavelet transform and has self-study, self adjustment and nonlinear mapping functions of neural networks, so the structure of WNN and PID tuning with WNN was proposed, the tuning algorithm was applied into AVR control system, the simulation was taken with normal BP neural network and WNN, the efficiency and advantages of this control strategy was successfully demonstrated which can applied into AVR system for power system stability.


2010 ◽  
Vol 102-104 ◽  
pp. 776-780 ◽  
Author(s):  
Xiu Lin Li ◽  
Jian Sha Lu ◽  
Guo Zhong Chai ◽  
Hong Tao Tang

To deal with problem of manufacturing system stability caused by uncertain factors in discrete production process, holon was introduced to manufacturing execution system (MES). A distributed manufacturing control architecture based on holon was established. This architecture using cooperation mechanism based stigmergy to realize agility, autonomy and intelligence of system control. Based on the architecture, holon driven agents to visit production elements, acquiring dynamic information of production process. Model design of production factors as order, resource, raw material, product and management factors as optimize, execution was described amply. Finally, workflow of this system was depicted with an example of uncertain order factor.


Author(s):  
Kiminobu Hojo ◽  
Daigo Watanabe

The previous paper ASME PVP2012[1] reported application of Gurson model to the fracture test results using pipe models with part-through wall cracks on the dissimilar metal (DM) welds. The predicted maximum loads and the crack behaviors after penetration did not agree well. These results may originate from improper parameter values of Gurson model. This paper revised these parameters and improved the estimated fracture behaviors of the pipe models. A suitable fitting process of Gurson parameters was also proposed.


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