Operating complex plants is an increasingly demanding task for human operators. Diagnosis of and reaction to on-line events requires the interpretation of real time data. Vast amounts of sensor data as well as operati...
Operating complex plants is an increasingly demanding task for human operators. Diagnosis of and reaction to on-line events requires the interpretation of real time data. Vast amounts of sensor data as well as operational knowledge about the state and design of the plant are necessary to deduct reasonable reactions to abnormal situations. Intelligent computational support tools can make the operator's task easier, but they require knowledge about the overall system in form of some model. While tools used for fault-tolerant control design based on physical principles and relations are valuable tools for designing robust systems, the models become too complex when considering the interactions on a plant-wide level. The alarm systems meant to support human operators in the diagnosis of the plant-wide situation on the other hand fail regularly in situations where these interactions of systems lead to many related alarms overloading the operator with alarm floods. Functional modelling can provide a middle way to reduce the complexity of plant-wide models by abstracting from physical details to more general functions and behaviours. Based on functional models the propagation of failures through the interconnected systems can be inferred and alarm floods can potentially be reduced to their root-cause. However, the desired behaviour of a complex system changes due to operating procedures that require more than one physical and functional configuration. In this paper a consistent representation of possible configurations is deduced from the analysis of an exemplary start-up procedure by functional models. The proposed interpretation of the modelling concepts simplifies the functional modelling of distinct modes. The analysis further reveals relevant links between the quantitative sensor data and the qualitative perspective of the diagnostics tool based on functional models. This will form the basis for the ongoing development of a novel real-time diagnostics system based on
In-pipe inspection robots are designed to pull out the human role from work load and risky working circumstances. In this paper an in-pipe inspection robot version 2 (IPIR version 2) is presented which composed of two...
In-pipe inspection robots are designed to pull out the human role from work load and risky working circumstances. In this paper an in-pipe inspection robot version 2 (IPIR version 2) is presented which composed of two driving leg systems, two supporting leg systems and a connecting body. Novelty of version 2 is its stability and diameter adaptability. Stability of version 2 is enhanced by adding two supporting leg systems in version 1 and diameter adaptability of version 2 is improved by optimizing its spring design. All major components of version 2 are designed safely. Solid modelling of all robot parts and its assembly is carried out in Solidworks 16. mathematicalmodelling of version 2 is carried by Lagrange's method. A planetary geared DC motor with encoder (IG42E-104K) is used as prime mover of IPIR version 2. This robot has mainly employed aluminium as structural material. To verify the efficacy of driving mechanism, several experiments of version 2 are conducted in horizontal pipes, vertical pipes and couplings of 8 inches to 10 inches diameter range. This IPIR version 2 will be employed for offline visual checking of various pipe components like horizontal pipes, vertical pipes and couplings in water pipelines, gas pipelines and drain pipes etc.
Speech signals may provide important information for measuring and modellinghumanbehaviour, especially for assessing mental health as well as estimating the emotional state of a person. Speaker's physiological a...
Speech signals may provide important information for measuring and modellinghumanbehaviour, especially for assessing mental health as well as estimating the emotional state of a person. Speaker's physiological and/or physical state may be thus identified by detecting the cognitive decline (CD) or stress levels using signal analysis of voice. This preliminary study presents a survey on methods introduced for CD and stress voice detection in humans. It is shown that increase in signal's fundamental frequency (f0) as well as its frequency formants, are the most common effects of CD and stress. Additional voice parameters could be used to identify normal from CD and normal from stressed voice as well as the cognitive state of the elderly. The present study poses the initiation of a project for the development of a mobile application for the automated voice detection and analysis on the fly, which will aid in the detection of early signs of CD and stress. Further investigation with application on a large number of voice samples is required for validating the methods.
The goal in this research is to develop a brand new ABS set of rules the use of doubtlessly available statistics approximately wheel forces. A novel ABS set of rules that uses both force and wheel slip measurements fo...
The goal in this research is to develop a brand new ABS set of rules the use of doubtlessly available statistics approximately wheel forces. A novel ABS set of rules that uses both force and wheel slip measurements for manipulate is designed. In this study, a new integrated Nonlinear tracking Control (NTC) is evolved that includes the dynamic evaluation of hydraulic braking systems. A longitudinal dynamic behaviour of vehicle model under straight manoeuvre is simulated, which includes the angular wheel speed, vehicle velocity, wheel slip variation, brake pressure modulation and stopping distance. mathematicalmodelling of Vehicle Braking System has been carried out in simulink, which employs a car pitch optimization using nonlinear control, when vehicle undergoes a surprising acceleration/deceleration and for the duration of panic braking scenario.
A physical and mathematical model of the water-air mode of free-flow drainage pipelines has been developed. The solution to the problem of physical modelling of pipeline network functioning is based on the study of th...
A physical and mathematical model of the water-air mode of free-flow drainage pipelines has been developed. The solution to the problem of physical modelling of pipeline network functioning is based on the study of the dynamics of changes in the hydraulic and aerodynamic parameters of the system, taking into account the phenomena of heat and mass transfer between liquid and air in the vaulted space of a free-flow pipeline. An algorithm for solving the problem is compiled on the basis of the criteria of hydrodynamic similarity, describing the phenomena of mass transfer as a result of forced air convection by using a mechanical ventilation system above the water surface. Based on the results of applying a special computer-aided calculation program, indicators of the required air exchange rate for effective removal of evaporation (steam) from the vaulted space of a pipeline were determined. As a result of solving the complex problem of studying the water-air mode of free-flow pipeline functioning, the authors compared and analysed the calculated values of the intensity of air exchange produced to remove steam, and to reduce harmful foul-smelling gaseous substances to reach the values of maximum permissible concentrations. The research results are aimed at preventing emissions of gases harmful to human health into the atmospheric air by constructive methods.
This paper deals with the performance modelling and analysis of offshore wind turbine-driven hydraulic pumps. The concept consists of an open loop hydraulic system with the rotor main shaft directly coupled to a swash...
This paper deals with the performance modelling and analysis of offshore wind turbine-driven hydraulic pumps. The concept consists of an open loop hydraulic system with the rotor main shaft directly coupled to a swash plate pump to supply pressurised sea water. A mathematical model is derived to cater for the steady state behaviour of entire system. A simplified model for the pump is implemented together with different control scheme options for regulating the rotor shaft power. A new control scheme is investigated, based on the combined use of hydraulic pressure and pitch control. Using a steady-state analysis, the study shows how the adoption of alternative control schemes in a the wind turbine-hydraulic pump system may result in higher energy yields than those from a conventional system with an electrical generator and standard pitch control for power regulation. This is in particular the case with the new control scheme investigated in this study that is based on the combined use of pressure and rotor blade pitch control.
Environmental contamination triggered by dyes has gained global attention. Industrial effluent of dye in high concentration into the rivers must be reduced to minimise the harmful effect on the quality of water that t...
Environmental contamination triggered by dyes has gained global attention. Industrial effluent of dye in high concentration into the rivers must be reduced to minimise the harmful effect on the quality of water that threatens human health. The removal of dye from wastewater is a significant step in addressing the problem of dye emission which can be achieved through adsorption separation technologies. In the most adsorption process, the adsorbent is in contact with fluid in a fixed bed. The performance of adsorptive separation of dye can be predicted through a fixed bed mathematical model which consists of coupled partial differential equations for optimizing the design and operating conditions. This paper presents a mini-review of mathematicalmodelling of fixed-bed adsorption of dye. The discussions are limited to the used of single component-dye separation in, convection-diffusion equations coupled with Langmuir isotherm. Besides, the numerical methods used for solving the convection-diffusion equations are also discussed in this paper.
Crack increment is a phenomenon in fracture mechanics. It is occurred due to the stress concentration at the imperfection material. Thus, it leads a crack to growth. Then, the crack will reach to a critical crack leng...
Crack increment is a phenomenon in fracture mechanics. It is occurred due to the stress concentration at the imperfection material. Thus, it leads a crack to growth. Then, the crack will reach to a critical crack length before catastrophic failure could occur. Before the catastrophic failure occur, the cracked structure can be fully utilised until the crack reach to the critical crack length. Thus, it is crucial to investigate the behaviour of the crack increment in fracture mechanics. The main purpose of this paper is to model the crack increment in fracture mechanics analysis via Kolmogorov-Smirnov test. The modelling requires a collection of crack data through experimental work. Then, the data was evaluated based on Kolmogorov-Smirnov test. The results show that the crack increment can be modelled as a Gaussian distribution.
This paper focuses on a simulation platform to model and simulate the energy consumption of a building with multiple zones under the influence of daily and seasonal environmental factors, as well as the impact of the ...
This paper focuses on a simulation platform to model and simulate the energy consumption of a building with multiple zones under the influence of daily and seasonal environmental factors, as well as the impact of the HVAC system and human activities. By using model-based requirements engineering (MBRE), the requirements of the simulation platform are hierarchically derived and specified. On this basis, the simulation platform is designed and developed. With the help of the simulation platform, it is possible to obtain a mathematical model for a realistic description of the thermodynamics and energy consumption of the individual zones of a building, which can be used as a basis for the model-based development of the energy management system, e.g. intelligent energy dispatch strategy. In the following, the concept of the simulation platform and the process will be demonstrated and validated with an application example of the research building Open Mobility Lab (OML).
In this paper the problem of mutual interaction of incompressible viscous fluid flow with an elastic structure is considered. A model problem of aiflow induced vibratioon of a simplified human vocal folds model is stu...
In this paper the problem of mutual interaction of incompressible viscous fluid flow with an elastic structure is considered. A model problem of aiflow induced vibratioon of a simplified human vocal folds model is studied. The main attention is paid to the problem of the periodical collisions of vocal folds. First, these collisions are taken into account in the flow model by the application of a suitable inlet boundary condition. Further, in the structure model the contact is resolved with the aid of application of Hertz forces. Numerical results are shown.
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