scholarly journals Formal Verification of a Power Controller Using the Real-Time Model Checker Uppaal

1999 ◽  
pp. 277-298 ◽  
Author(s):  
Klaus Havelund ◽  
Kim Guldstrand Larsen ◽  
Arne Skou
Keyword(s):  
Formal Verification ◽  
Real Time ◽  
Model Checker ◽  
Time Model ◽  
The Real ◽  
Power Controller

scholarly journals Formal Verification of a Power Controller Using the Real-Time Model Checker UPPAAL

1999 ◽  
Vol 6 (8) ◽  
Author(s):  
Klaus Havelund ◽  
Kim G. Larsen ◽  
Arne Skou
Keyword(s):  
Real Time ◽  
Product Line ◽  
Model Checker ◽  
Time Model ◽  
Real Time System ◽  
The Real ◽  
Time Requirements ◽  
Hard Real Time ◽  
Audio Video ◽  
And Control

A real-time system for power-down control in audio/video components<br />is modeled and verified using the real-time model checker UPPAAL. The<br />system is supposed to reside in an audio/video component and control (read from and write to) links to neighbor audio/video components such as TV, VCR and remote–control. In particular, the system is responsible for the powering up and down of the component in between the arrival of data, and in order to do so in a safe way without loss of data, it is essential that no link interrupts are lost. Hence, a component system is a multitasking system with hard real-time requirements, and we present techniques for modeling time consumption in such a multitasked,<br />prioritized system. The work has been carried out in a collaboration between Aalborg University and the audio/video company B&O. By modeling the system, 3 design errors were identified and corrected, and the following verification confirmed the validity of the design but also revealed the necessity for an upper limit of the interrupt frequency. The resulting design has been implemented and it is going to be incorporated as part of a new product line.

scholarly journals Real-Time Human in the Loop MBS Simulation in the Fraunhofer Robot-Based Driving Simulator

2014 ◽  
Vol 61 (2) ◽  
pp. 270-285 ◽  
Author(s):  
Michael Kleer ◽  
Andrey Gizatullin ◽  
Klaus Dreßler ◽  
Steffen Müller
Keyword(s):  
Real Time ◽  
Driving Simulator ◽  
Practical Significance ◽  
Time Model ◽  
Test Drive ◽  
The Real ◽  
Transport Delay ◽  
Human In The Loop ◽  
Acceleration Signal ◽  
Time Calculation

Abstract The paper encompasses the overview of hardware architecture and the systems characteristics of the Fraunhofer driving simulator. First, the requirements of the real-time model and the real-time calculation hardware are defined and discussed in detail. Aspects like transport delay and the parallel computation of complex real-time models are presented. In addition, the interfacing of the models with the simulator system is shown. Two simulator driving tests, including a fully interactive rough terrain driving with a wheeled excavator and a test drive with a passenger car, are set to demonstrate system characteristics. Furthermore, the simulator characteristics of practical significance, such as simulator response time delay, simulator acceleration signal bandwidth obtained from artificial excitation and from the simulator driving test, will be presented and discussed.

Formalizing Timed BPEL by D-LOTOS

2014 ◽  
Vol 5 (2) ◽  
pp. 1-21
Author(s):  
Imed Eddine Chama ◽  
Nabil Belala ◽  
Djamel Eddine Saidouni
Keyword(s):  
Web Services ◽  
Formal Verification ◽  
Real Time ◽  
Formal Representation ◽  
The Real ◽  
True Concurrency ◽  
Transformation Approach ◽  
Abstract Specification

Different standards and languages are proposed in the literature to model the composition of Web services. Unfortunately these languages are essentially syntactic and thus contain much ambiguity and inconsistency. In addition, the formal verification of the proposed languages is impossible. In this paper, the authors propose a transformation approach allowing the formal representation, analysis and refinement of Web services compositions. Both timed constraints and the durations of interactions between these services are taken into account. The authors present a mapping from Web services described in the BPEL language to an abstract specification written in the real-time language D-LOTOS which is based on true-concurrency semantics.

Real-Time Model Method Research in Ship Pipeline System Leakage Detecting

2011 ◽  
Vol 105-107 ◽  
pp. 685-688 ◽  
Author(s):  
Hong Hao Yin ◽  
Hui Chen ◽  
Zhong Bo Peng
Keyword(s):  
Experimental Data ◽  
Pressure Gradient ◽  
Real Time ◽  
Pipeline System ◽  
Safe Operation ◽  
Time Model ◽  
Positioning Accuracy ◽  
The Real ◽  
Model Method ◽  
The Difference

Leakage of ship pipeline system has become a great hidden danger, which affects safe operation of ship and causes environmental pollution. In order to isolate leaking pipeline safely in emergency conditions, Real-time monitoring of ship pipeline system leakage is very important. In this paper, the real-time models of ship isothermal and thermal pipeline were established with a set of equations which is running synchronized with the actual execution pipeline, and the real-time model method was used to monitor ship pipeline system leakage. If the difference between measured values and calculated values is greater than a certain range, pipeline leakage is identified. The location of leakage is calculated based on pressure gradient. Only pressure, flow and temperature of the first and second end of the pipeline were needed, can this method achieve leakage detecting and locating. According to the analysis and verification from the experimental data, this method has high leakage resolution and positioning accuracy.

scholarly journals ABOUT DEVELOPMENT OF SIMULATION FROM ANTIQUITY TO OUR DAYS

2018 ◽  
Vol 13 (1) ◽  
pp. 119-125
Author(s):  
Михаил Волхонов ◽  
Mihail Volhonov ◽  
Игорь Зимин ◽  
Igor' Zimin ◽  
Иван Максимов ◽  
...  
Keyword(s):  
Real Time ◽  
Human Activity ◽  
Functional Information ◽  
Sources Of Information ◽  
Time Model ◽  
The Real ◽  
Scientific Experiment ◽  
Production Experiment ◽  
Degree Of Certainty ◽  
Mental Modeling

In the article, based on the analysis of available sources of information, information on various types of modeling is systematized and presented, an improved classification is proposed according to which one can distinguish: full, incomplete and approximate (in completeness); stochastic and deterministic (by degree of certainty); discrete, discrete-continuous, continuous (by intermittence); static and dynamic (by the change in time); constructive and descriptive (by the presence of controlled variables); functional, information, behavioral (depending on the aspect of modeling); educational, experimental, scientific and technical, game and imitation (in the field of modeling); mental and real (in the form of implementation); the real, depending on the method of implementation, is divided into the natural (scientific experiment, complex tests, production experiment) and physical (in real time, model time and without time); depending on whether the computer is used for mental modeling is divided into computer and non-computer. By the way of realization, the mental is divided into visual (hypothetical, analog and mocked), symbolic (linguistic and sign) and mathematical (situational, cybernetic, structural, analytical, algorithmic and combined). Also, the mathematical, depending on the properties reflected, is divided into geometric, probabilistic and topological. The article presents historical facts related to the stages of the development of modeling. Causes and main directions of development of modeling and direction of human activity are indicated, in which modeling currently performs one of the main roles.

scholarly journals Accelerated vs. real time modeling for shelf life: an example with fortified blended foods

2014 ◽  
Vol 17 (3) ◽  
pp. 83-91
Author(s):  
Uyen Thuy Xuan Phan ◽  
Chambers, Edgar IV ◽  
Padmanabhan, Natarajan ◽  
Alavi, Sajid
Keyword(s):  
Relative Humidity ◽  
Shelf Life ◽  
Real Time ◽  
Life Testing ◽  
Time Model ◽  
The Real ◽  
Life Study ◽  
Time Modeling ◽  
Life Model ◽  
Deterioration Process

Shelf life can be simply defined as the duration of that the food remains acceptable for consumption. Determining shelf life of a product, thus, has become essential in quality control because consumer’s demands for safe and high quality products have increased. Accelerated shelf life testing (ASLT), which subjects the food to environments that are more severe than normal to speed up the deterioration process, has long been used in shelf life studies because it can help make decisions more quickly by minimizing time and it minimizes costs. The criterion used to determine shelf life can be the changes in either physical, chemical, biological or sensory characteristics. This study used sensory descriptive properties as the primary criteria to investigate the validity of using Accelerated Shelf Life Testing (ASLT) to determine shelf life of four extruded fortified blended foods (FBFs) compared to a real time model. The real-time environment was set at 300C and 65% relative humidity, based on the weather in Tanzania, the expected location of product use. The ASLT environment was at 500C and 70% relative humidity based on a Q factor of 2, which was equivalent to a one-week ASLT equals onemonth real time. The samples were evaluated for aroma and flavor by a highly trained descriptive panel for 3 time points in each shelf life model. Among the eighteen attributes tested, rancid and painty were the main sensory criteria to determine the shelf life of the products. The ASLT shelf life predictive model was consistent with the real time shelf life for three of the samples. However, it failed to predict the real time shelf life of the fourth similar sample. This affirms the essential use of real time modeling in shelf life study for a new product, even when an accelerated model has been developed for other similar products in the same category. ASLT testing can still be used, but only for early guidance or after validation.

scholarly journals Passivity based Approach for the Level Control of Spherical Tank Process

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Priya C ◽  
Lakshmi Ponnnusamy
Keyword(s):  
Real Time ◽  
Open Loop ◽  
Level Control ◽  
Time Model ◽  
Single Input Single Output ◽  
The Real ◽  
Single Output ◽  
Spherical Tank ◽  
Tank System ◽  
Single Input

The aim of this paper is to obtain the mathematical model and the real time model of the Single Input Single Output (SISO) conical tank system. The experimental model is obtained from the open loop response in real time and the transfer function is obtained using the two point method. For the real time model, two different controllers namely Zeigler Nichols tuned PI controller and passivity based controller are designed and tested in simulation and the performance of both the controllers are tested for servo operation and regulatory operation. The designed controllers are tested in Simulation and the response is recorded. The simulation results shows that the Passivity based Controller works better for the spherical tank process.

Real-Time Model Building and Experiment Researching of Grinding Force for External Plunge Grinding Process

2006 ◽  
Vol 532-533 ◽  
pp. 905-908
Author(s):  
Guo Fa Li ◽  
Long Shan Wang ◽  
Shu Xiang Yang
Keyword(s):  
Real Time ◽  
Model Building ◽  
Grinding Force ◽  
Grinding Process ◽  
Time Model ◽  
Plunge Grinding ◽  
The Real ◽  
On Line ◽  
Grinding System ◽  
Good Agreement

A real-time model of two-direction grinding force for external plunge grinding process has been built based on the research of grinding system dynamics equation. The two-direction grinding force can be measured on-line by a force cell sensor developed in this paper. And the grinding depth and grinding force, which depend on grinding time, were dynamic simulated by computer simulation. The experimental results are in good agreement with the simulation results, proved the real-time model’s exactitude. The real-time models showed in this paper not only can predict and evaluate grinding behave and quality, but also provide the precondition for grinding optimum, intelligential control, and virtual grinding research etc.

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