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Dynamical technical networks and dynamic network objects (DNO) as a special case of them are considered in many subject areas as objects of research, design, quality assurance, automatization, monitoring and control. In this paper we focus on the simulation of the mine air networks (MAN) as an example of dynamic network objects with distributed parameters. To improve the simulation process, we propose...
Taking the atmospheric pressure simulation system (APSS) as the research object, the reasons of the pressure control performance degradation of the single-stage APSS affected by the change of working point in low pressure range are analyzed. In order to improve the pressure control performance, the cascaded APSS is proposed instead of the single-stage APSS. Research results show that the proposed...
The observation of quadruped animals has suggested that the body flexibility is important for the bounding gait. In particular, the body flexibility is assumed to be crucial for determining the ground reaction force (GRF). In this paper, we investigated the dynamic effect of the body flexibility on the GRF in quadruped bounding with simple physical models by focusing on the vertical motion. More specifically,...
Today, there are typically two main approaches for dehazing, that is, enhancing images taken in hazy or foggy conditions. The first method is based on general image enhancement techniques where algorithms such as histogram equalization or Retinex are often used. The second one, uses an image restoration approach through the building of a haze physical model. In this paper, we make the dehazing task...
This paper presents a novel image haze removal approach from single image. In the algorithm, the constant albedo and dark channel prior methods are combined to represent the transmission model of hazed image. And then, the quick shift segmentation approach is introduced to decompose the input image into some gray level consistent areas. Compared with traditional fixed image partition schemes, better...
This paper presents a novel image haze removal approach from single image. In the algorithm, the constant albedo and dark channel prior methods are combined to represent the transmission model of hazed image. And then, the watershed segmentation approach is introduced to decompose the input image into some gray level consistent areas. Compared with traditional fixed image partition schemes, better...
In this article the method of exact linearization is applied to pneumatic systems. These systems are used in industrial environments like in glassworks or automotive industry to guarantee an exact and constant air flow. In addition with a subordinate high dynamic pressure control the closed loop reaches the desired setpoint as soon as possible. Although in the transformed system model zero dynamics...
Single image dehazing has been a challenging problem due to its ill-posed nature. Most of the existing dehazing algorithms are based on single atmospheric scattering model. However, this model is not capable of explaining complex effects of weather on images as multiple scattering occurs in real world. Existing multiple scattering models are widely utilized for simulating various weather condition;...
In the fall semester of 2008, students in a first-year engineering course at Purdue University completed three Model-Eliciting Activities (MEAs): Paper Airplane Challenge, Just-In-Time Manufacturing, and Travel Mode Selection. MEAs are realistic, open-ended, client-driven engineering problems designed to foster students' mathematical modeling abilities. The primary artifact produced by each team (N=295...
This paper presents a new PI tuning method for first order systems with a long dead time. The PI tuning rule is aimed to be simple so that it would be easy to design and apply the controller to industrial processes. The proposed tuning rule is found by z-domain design techniques, in order to get the fastest response without overshoot. The results obtained by the proposed method have been compared...
The contribution presents web based dynamic modeling in school physics developed by means of Hypertext Preprocessor PHP. By this approach we enable to understand various physical phenomena to students and at the same time to demonstrate the power of the dynamic modeling that is used mainly in technology and science. Dynamic modeling can be used to present to pupils results of examples they would not...
This paper presents a numerical simulation based on computational fluid dynamics (CFD) method on the enhancement of natural ventilation in an industrial workshop with heat source induced by solar chimney (SC). Four types of SC were designed to attach to the top and southern roof of the workshop. Realizable k-ε turbulent model and DO (discrete ordinate) radiation model were used to calculate the air...
This paper presents a numerical simulation based on computational fluid dynamics (CFD) method on the enhancement of natural ventilation in an industrial workshop with heat source induced by solar chimney (SC). Four types of SC were designed to attach to the top and southern roof of the workshop. Realizable k-ε turbulent model and DO (discrete ordinate) radiation model were used to calculate the air...
Harmful substances emitting from aluminum electrolysis process may pollute the environment. Ventilation is the effective means to control the hazards. In order to obtain the best ventilation effect for 300kA aluminum electrolysis plant, CFD method is used to simulate and optimize the workshop ventilation. Based on theoretical analysis and preliminary calculation, a 3D model is built, five kinds of...
A new energy-saving type of air-conditioning named large and small zone ventilation for loom workshop is proposed in authors' preliminary work. There are four factors which effect greatest large and small zone ventilation and are concerned by most designer and operators. These factors are: relative humidity of air-inlet in working area, speed of air-inlet in working area, relative humidity of background...
Corrosion is a serious problem in atmospheric distillation unit when the plant refines high-acid crude oil from Shengli Oil Field. How to measure and predict the corrosion and related factors is a significant task in refinery. The GM (1, 1) model can only predict the sequence of exponential law, scribe the monotonic change event. We take acid values as a sample, use the data from the first to 6th...
The method of ventilating system optimization for Roots Blower workshop has been studied according to the problem of bad ventilating effect with the transmitted medium of carbon monoxide in a chemical factory based on computational fluid dynamics (CFD). An optimized ventilating system has been designed and carried out as follows: the ventilating system is effective with the cooling air flowing in...
This paper presents the design of a set of sliding mode controllers for a quadrotor vertical take-off and landing (VTOL) unmanned air vehicle. To facilitate the design process of this under-actuated system, this paper proposes the use of a simple yet effective method to plan the action of each variable controller in the system and hence enhance the performance of the quadrotor. To stabilize the overall...
Recently, Lee et al. proposed a remote authentication model of information appliances (RAMIA). Unfortunately, RAMIA has a fatal error that opens the entire home network of information appliances to hackers. In this paper, we propose a new secure remote control model for information appliances (SRCMIA) to fix this error. Besides, our model can also achieve both message authentication and one-time secret...
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