An Extended Dynamic Model for Kinematic Positioning

2003 ◽  
Vol 56 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Michael Moore ◽  
Jinling Wang
Keyword(s):  
Kalman Filter ◽  
Data Acquisition ◽  
Dynamic Model ◽  
Dynamic Modelling ◽  
Simulated Data ◽  
Acquisition Rate ◽  
Dynamic Conditions ◽  
Kinematic Positioning ◽  
Non Linear ◽  
Extended Dynamic

The main problems faced by a dynamic model within a Kalman filter occur when the system experiences unexpected dynamic conditions, a change in data acquisition rate, or when the dynamics of the system are non-linear. To minimize the errors produced from dynamic modelling in unusual conditions, an extended dynamic model is developed in this paper, and its usefulness demonstrated through comparison of the performance of a Kalman filter's response to simulated data with a standard dynamic model and the extended dynamic model. The results show that, in use, the proposed extended dynamic model is superior to a standard dynamic model, due mainly to its ability to adapt to a wider range of dynamic conditions, which in turn ensures the optimization of the Kalman filter and the consequent generation of reliable positioning results.

scholarly journals Non-linear wave data assimilation with an ANN-type wind-wave model and Ensemble Kalman Filter (EnKF)

2010 ◽  
Vol 34 (8) ◽  
pp. 1984-1999 ◽  
Author(s):  
Ahmadreza Zamani ◽  
Ahmadreza Azimian ◽  
Arnold Heemink ◽  
Dimitri Solomatine
Keyword(s):  
Kalman Filter ◽  
Data Assimilation ◽  
Ensemble Kalman Filter ◽  
Wind Wave ◽  
Wave Model ◽  
Linear Wave ◽  
Wave Data ◽  
Non Linear

Non-linear dynamic modelling of a switching valve driven by pulse width modulation in the hydraulic braking system of a vehicle

2016 ◽  
Vol 231 (11) ◽  
pp. 1511-1529
Author(s):  
Xiang Gao ◽  
Yiyong Yang ◽  
Xun Zhao ◽  
Chenfeng Li
Keyword(s):  
Fluid Dynamics ◽  
Dynamic Modelling ◽  
Stability Control ◽  
Dynamics Model ◽  
Predictive Tool ◽  
Element Analysis ◽  
Linear Dynamics ◽  
Switching Valve ◽  
Fast Switching ◽  
Non Linear

Fast-switching valves driven by puse width modulation have been widely used in the hydraulic braking systems (such as anti-lock braking systems or electric stability control systems) of vehicles, because of their lower cost and their functions which are similar to those of proportional valves. However, proportional valves have been widely investigated, whereas there is significantly less literature on the switching valves of the hydraulic control units in the braking systems of vehicles. In order to investigate the controllability of pressure, construction of an accurate theoretical model is the key to attaining this. Based on theoretical analysis and finite element analysis, this paper presents a non-linear dynamics model of a typical fast-switching valve. The non-linear model is composed of three submodels: a mechanical submodel, an electromagnetic submodel and a fluid dynamics submodel. The fluid momentum theorem combined with the simulation curve-fitting method is used to model accurately the fluid dynamics which are due to the varying flow field. The hydraulic force acting on the spool can be obtained directly from this model. Finally, the feasibility of the response time and the pressurization performance of the non-linear dynamics model is proved by comparing the simulation results from MATLAB/Simulink with the experimental results obtained on a test bench. The study shows that the model can be regarded as a predictive tool for future investigation.

Rotorcraft control response using linearised and non-linear flight dynamic models with different inflow models

2017 ◽  
Vol 121 (1238) ◽  
pp. 553-575 ◽  
Author(s):  
T. Sakthivel ◽  
C. Venkatesan
Keyword(s):  
Dynamic Model ◽  
Dynamic Models ◽  
Model Identification ◽  
Flight Test ◽  
Step Size ◽  
Response Characteristics ◽  
Wide Range ◽  
Non Linear ◽  
Steady Level ◽  
Control Response

ABSTRACTThe aim of the present study is to develop a relatively simple flight dynamic model which should have the ability to analyse trim, stability and response characteristics of a rotorcraft under various manoeuvring conditions. This study further addresses the influence of numerical aspects of perturbation step size in linearised model identification and integration timestep on non-linear model response. In addition, the effects of inflow models on the non-linear response are analysed. A new updated Drees inflow model is proposed in this study and the applicability of this model in rotorcraft flight dynamics is studied. It is noted that the updated Drees inflow model predicts the control response characteristics fairly close to control response characteristics obtained using dynamic inflow for a wide range of flight conditions such as hover, forward flight and recovery from steady level turn. A comparison is shown between flight test data, the control response obtained from the simple flight dynamic model, and the response obtained using a more detailed aeroelastic and flight dynamic model.

scholarly journals RANCANG BANGUN KEBIJAKAN PENGEMBANGN BUDIDAYA LELE MELALUI PENDEKATAN MODEL DINAMIK

2016 ◽  
Vol 3 (1) ◽  
pp. 153
Author(s):  
Budi Wardono ◽  
Prayudi Budi Utomo
Keyword(s):  
Dynamic Model ◽  
Dynamic Modelling ◽  
Local Production ◽  
Policy Model ◽  
The Third ◽  
Local Product ◽  
Aquaculture Production ◽  
Potential Land

Lele merupakan salah satu komoditas perikanan ekonomis penting yang mendapat prioritasdalam Program Minapolitan Kementerian Kelautan dan Perikanan, terutama di Kabupaten Gunungkidul.Penelitian ini dilakukan pada tahun 2011 yang berlokasi di Propinsi Daerah Istimewa Yogyakarta.Tujuan penelitian adalah menyusun model kebijakan pengembangan perikanan budidaya Ikan Leleuntukmendukung produksi perikanan budidaya melalui pendekatan model dinamik. Teknik analisisini berasumsi bahwa apabila sistem perikanan dipertahankan, permintaan Ikan Lele akan mengalamikenaikan. Hasil simulasi menunjukkan bahwa permintaan meningkat dan puncaknya terjadi pada tahunke 4. Sementara itu, pasokan dari luar daerah terus meningkat pada tahun ke 4 hingga ke 10. Fluktuasiharga terjadi, tahun ke 3 hHarga lele mengalami penurunan akibat banyaknya produksi lokal terjadi padatahun ke-3., namun pPada tahun ke 5 harga mengalami kenaikan akibat kekurangan pasokan. Olehkarena itu, diperlukan kebijakan peningkatan produktivitas dan pendapatan usaha budidaya lele denganmemanfaatkan lahan-lahan potensial maupun meningkatan produktifitas usaha.Title: Constructive Design for Catfish Aquaculture DevelopmentPolicy Through Dynamic Model ApproachCatfish is one of the priority product of fisheries commodity in “Minapolitan” Program introducedby the Ministry of Marine Affairs and Fisheries, particularly in Gunungkidul District, Yogyakarta Province.The study was conducted during 2011 to 2012. .This study aimed to construct the policy model for Catfishaquaculture development to support aquaculture production by using dynamic modelling approache.Technique analysis assumed that Catfish demand will increase when existing fisheries system could bemaintained. Finding shows that the demand sharply increased on the fourth year of project. Meanwhile,Catfish supply from other region would be increase on the fourth year and tenth year. Catfish price hasdecreased on the third year due to over supply of local production. However, Catfish price increasedon the fifth year due to less supply of the local product. Therefore, appropriate strategies needed toencourage increased productivity and farmers income by revitalize the potential land and increasebusiness productivity.

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