scholarly journals Pressure Interaction of Mixing Particulate Material Along the Blade Length

2015 ◽  
Vol 23 (1) ◽  
pp. 43-49
Author(s):  
Peter Peciar ◽  
Marián Peciar ◽  
Roman Fekete ◽  
Juraj Úradníček
Keyword(s):  
Pressure Distribution ◽  
Energy Intensity ◽  
Theoretical Background ◽  
Particulate Material ◽  
Measuring System ◽  
Blade Height ◽  
Equilibrium Limit ◽  
State Of Stress ◽  
Mixed Material ◽  
Mohr’S Circle

Abstract To assess the energy intensity of particulate materials mixing, it is necessary to know the state of stress in the particulate material in front of mixing elements. The theoretical background of this process results from the theory of the equilibrium limit of the particulate material, and this state may by described by Mohr’s circle theory and the Novosad model. Based on the above assumptions, it is possible to derive the pressure distribution along the blade height, but only for an infinitely long blade. A measuring system implemented on the homogenizer blade was constructed to examine the effects of the distribution of the mixed material on the mixing element along its length.

Analysis of Mixing of Particulate Material by a Single Blade

2015 ◽  
Vol 244 ◽  
pp. 40-47
Author(s):  
Peter Peciar ◽  
Marian Peciar ◽  
Roman Fekete
Keyword(s):  
Approximate Calculation ◽  
Theoretical Study ◽  
Theoretical Background ◽  
Particulate Material ◽  
Measuring System ◽  
Mixing Process ◽  
Equilibrium Limit ◽  
Energy Demands ◽  
Mechanical And Physical Properties ◽  
Correct Estimation

For a correct estimation of the energy demands of particulate systems mixing it is necessary to know the stress in the particulate material situated in front of the mixing element. Despite the theoretical knowledge of the overall stress in front of the homogenizer blade, so far there is no experimental verification in the literature, due to the current absence of a suitable measuring system. This study focuses on an understanding of the distribution of the force interactions between the particulate material and the blade along its height during the mixing process. The theoretical background of this process results from the theory of equilibrium limit of the particulate material, and this state may by described by Mohrʼs circle theory. The Novosad model is the theoretical model which enables an approximate calculation of the force acting on the blade. This model takes into account the effect of the mechanical and physical properties of the particulate material. By modifying the fundamentals of the Novosad model, it will be possible to identify the force distribution along the height of the blade. For the verification of this theoretical study, a new patented measuring system was designed and implemented in the homogenizer blade.

Analysis of the State of Stress in the Hull of the Ship Kormoran II Loaded with Non-Contact Mine Explosion

2015 ◽  
Vol 236 ◽  
pp. 3-13 ◽  
Author(s):  
Bogdan Szturomski ◽  
Andrzej Grządziela ◽  
Radosław Kiciński
Keyword(s):  
Stress State ◽  
Pressure Distribution ◽  
Pressure Wave ◽  
The State ◽  
Acoustic Medium ◽  
Time Points ◽  
State Of Stress ◽  
The Way

In this paper an analysis of the stress state of the hull of the ship Kormoran II loaded by non-contact mine explosion were performed. An empirical description of the pressure wave from the non-contact TNT explosion loads reported by authors such as RH Cole T. L. Geers and K.S. Hunter was used. The way of modeling the pressure wave using the acoustic medium implemented CAE programs was shown. The paper presents the results of pressure distribution on the hull of the ship Kormoran II at selected time points from TNT explosion under the keel of the ship. The paper presents detailed results of the stress state in the selected nodes, for example on the frame of main motor construction.

Study on Photoelastic Method for Measuring Elastohydrodynamic Lubrication Pressure in Line Contact

2013 ◽  
Vol 281 ◽  
pp. 329-334
Author(s):  
Jun He ◽  
Huang Ping ◽  
Qian Qian Yang
Keyword(s):  
Film Thickness ◽  
Pressure Distribution ◽  
Reynolds Equation ◽  
Friction Pair ◽  
Elastohydrodynamic Lubrication ◽  
Ccd Camera ◽  
Measuring System ◽  
Line Contact ◽  
Basic Equations ◽  
Plastic Disk

In the present paper, a new method for measuring elastohydrodynamic lubrication (EHL) pressure in line contact is proposed, which is based on the photoelastic technique. The pressure distribution of EHL film and the inner stresses in the friction pairs are fundamental issues to carry out EHL research. The film thickness, pressure and temperature have been successfully obtained with solving the basic equations such as Reynolds equation and energy equation simultaneously or separately, with numerical model of EHL problem. The film thickness can be also measured with the optical interference technique. However, the pressure measurement is still a problem which has not been well solved yet, so as the inner stresses inside the friction pairs. With the experimental mechanics, the photoelastic technique is a possible method to be used for measuring the pressure distribution of EHL film and inner friction pair in the line contact. Therefore, A flat plastic disk and a steel roller compose the frictional pairs of the photoelastic pressure measuring rig with combining the monochromatic LED light source, polarizer CCD camera and stereomicroscope to form the whole pressure measuring system of the line contact EHL. The experimental results with the rig display the typical features of EHL pressure. This shows that the method is feasible to be used for measuring the pressure of EHL film and the inner stresses of the friction pairs in the line contact.

Simulation of Fretting Wear in Halfplane Geometries: Part 1—The Solution for Long Term Wear

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
D. A. Hills ◽  
A. Sackfield ◽  
R. J. H. Paynter
Keyword(s):  
Pressure Distribution ◽  
Oscillatory Shear ◽  
Fretting Wear ◽  
Hertzian Contact ◽  
Final Configuration ◽  
State Of Stress ◽  
Long Time

The final configuration of a cylindrical Hertzian contact, subject to oscillatory shear and undergoing wear, is studied. It is assumed that wear has proceeded for a long time, so that the final, modified contact is wholly adhered. It is shown that the extent of the final contact corresponds to that of the initial adhered region and the pressure distribution, and state of stress at the new contact edge are all derived, so that the environment in which cracks nucleate is well described.

PVDF Sensors – Research on Foot Pressure Distribution in Dynamic Conditions

2012 ◽  
Vol 79 ◽  
pp. 94-99 ◽  
Author(s):  
Ewa Klimiec ◽  
Wiesław Zaraska ◽  
Jacek Piekarski ◽  
Barbara Jasiewicz
Keyword(s):  
Pressure Distribution ◽  
Input Resistance ◽  
Open Circuit ◽  
Measuring Circuit ◽  
Measuring System ◽  
Pvdf Film ◽  
Foot Pressure ◽  
Pass Filter ◽  
Polymer Sensors ◽  
A Charge

The paper presents a dynamic measurement method of the distribution of foot pressure exerted on the ground by a four-point shoe insole, developed by authors, which can be placed in any sport footwear. The value of pressure was measured on the heel, medial midfoot, metatarsal, and great toe by recording values of a generated voltage by sensors which were made of piezoelectric polymer PVDF film 110 µm thick with printed silver electrodes. As confirmed by scanning microscope studies, the foil applied in the sensors is semi-crystalline. The shoe measurement insert consists of two polyester films without piezoelectric properties between them, electroactive polymer sensors were placed. The films were glued together. To match the measuring circuit to the sensors used, two circuits were tested, a voltage measuring circuit with an input resistance of above 1012 Ω (open circuit), and a charge measuring circuit (shorted circuit). The charge measuring circuits with the RC high-pass filter, which attenuates the slow-changing pyroelectric signal was selected as it ensures the desired measurement accuracy. As presented in the paper, as PVDF sensors are very sensitive to any mechanical deformation, it is important to properly design the shoe insole to ensure its correct use during pressure distribution measurements. The measuring system developed by the authors, allows testing of foot pathology for any length of time in a dynamic way.

scholarly journals Evaluation of Denture Functions in Complete Denture Wearers by Using Electromyography and Pressure Distribution Measuring System.

1991 ◽  
Vol 35 (4) ◽  
pp. 804-816
Author(s):  
Toshio Hosoi ◽  
Yoshikazu Ishikawa ◽  
Tsutomu Okajima ◽  
Takashi Sagae ◽  
Ryuichi Masuo ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Complete Denture ◽  
Measuring System

scholarly journals The Effect of the Pressure Distribution in a Three-Dimensional Flow Field of a Cascade on the Type of Curved Blade

1994 ◽  
Author(s):  
Zhongqi Wang ◽  
Jiexian Su ◽  
Jingjun Zhong
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Three Dimensional ◽  
Suction Surface ◽  
Three Dimensional Flow ◽  
Blade Height ◽  
Dimensional Flow ◽  
Cascade Energy ◽  
Curved Blade ◽  
Type Pressure

The effect of the pressure distribution in a three-dimensional flow field of a cascade on the type of curved blade is discussed in this paper through analysing the experimental results and numerical calculative results. Using curved blades, we can obtain “C” type pressure distribution along the blade height in the passage. For the expansion cascade, energy loss in the cascade can be reduced if positive curved blades are used. For guide vanes and compressor cascades, the choice of using positive curved blades or negative curved blades relies on the pressure gradient on the blade midspan suction surface along the direction of flow and whether there exists a separation of the boundary layer there. However, all of these need further studies and discussions.

scholarly journals Energy saving in rail transport

2021 ◽  
Vol 31 ◽  
pp. 1-4
Author(s):  
Jan Antoš
Keyword(s):  
Energy Saving ◽  
Energy Intensity ◽  
Theoretical Background ◽  
Current Data ◽  
Railway Track ◽  
Energy Flows ◽  
Simulation Calculation ◽  
Other Information ◽  
Reconstructed Track ◽  
Calculation Algorithms

Aim of this article is to introduce and present advantages and possibilities of using simulation tools to calculate energy flows of tractive vehicle in all phases of its ride. The focus is on the braking phase, especially on the braking energy recuperation that offers the highest energy saving potential.Energetic simulation was carried out as a part of a current railway reconstruction study, which is a good example of possible energetic calculation use. Energetic calculation in the simulation are performed using so called "exact method" developed at the Faculty of Transportation. The advantage of the method is that it provides a high degree of accuracy. Due to the simulation calculation being performed in real-time, the user can enter the calculation even during the simulation. Crucial part ofevery simulation are quality input data, such as vehicle braking characteristic (including all working points below the envelope line together with the efficiency characteristics of the power train parts (engine, transmission, convertor and others)). Also, sufficiently precise (with a precision of 1 meter) railway track details (detailed geometrical and other information on the current and reconstructed railway track or on the railway track proposal.To present savings during the ride, the railway track section on the track Montreál-Sherbrooke was chosen. On this track, (especially electrification and partial reconstruction of the superstructure) is planned. Reconstruction level will be dependant on the local economical and social conditions. However, in the most optimistic case, total electrification of the track will be undertaken, or lower level of the reconstruction when the vehicles that have very similar characteristics. The railway track section is located between the cities of Montreál and Sherbrooke, that are 160 km apart. To compare the current, and possible future, state, comparison of energy consumption of the vehicle was conducted on the same track with the same geometrical characteristics.We can assume that the overall energy intensity of the ride on the newly reconstructed track (eg. with greater radius of the arches) will be lower than the overall energy intensity of the ride on the track before reconstruction. Current data on energetic consumption are not available, therefore they were obtained by simulation and verified by calculations and considered sufficiently accurate.Presumably, the input simulation parameters required for the simulation will not always be delivered in the sufficient quality or will be partly missing completely. In these cases they will be substituted by various algorithms, that can be machine-processed and that are part of the simulation calculations. One of the crucial algorithms is so called "moment efficiency". Its machine processingis not entirely developed and therefore, this simulation will be conducted without its usage. For financial reasons, simulation calculation was verified only by the theoretical physical calculation method. Based on several partial results, emergent computing tool is functional and sufficiently accurate. The simulation program is supposed to be experimentally verified after its finishing.The outcomes presented in this article are calculated by simulated computation and were not confronted with the real situation in any way. However, relevant calculation algorithms, processes and theoretical background of the simulation were already verified on the older software versions. Therefore, the simulated outcomes are supposed to be at least sufficiently accurate to provide preliminary study for the railway reconstruction. Presented calculations were executed by using author’s simulation software.Part of the methodology was taken from the previous, already verified, versions of the software for vehicle ride simulation.

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