scholarly journals EFFECTS OF INLET CLOSURE LEVEL ON VIBRATION CHARACTERISTICS OF A MODIFIED CENTRIFUGAL FAN

2018 ◽  
Vol 80 (6) ◽  
Author(s):  
Zaimar Zaimar ◽  
Mursalim Mursalim ◽  
Hammada Abbas ◽  
Supratomo Supratomo
Keyword(s):  
Regression Analysis ◽  
Vibration Characteristics ◽  
Centrifugal Fan ◽  
Vibration Characteristic ◽  
Experiment Data ◽  
Full Factorial Experiment ◽  
High Turbulence ◽  
Closure Effect ◽  
Closure Level ◽  
Full Factorial

Inlet is one of the key parameters that plays an important role in a centrifugal fan. The change of parameters in an inlet can cause static and dynamic pressures in the fan housing. As a consequence, high turbulence can produce vibration. The aim of this research is to study the inlet closure level effects on the vibration characteristics of a modified centrifugal fan. The Inlet closure levels consist of 0; 25; 50; 75; 85; 100% that were tested to examine the vibration characteristic value (x, m, k, Ck, C). The test used a randomized complete design with full factorial experiment. Data analysis employed variance and regression analysis. The results show that the inlet closure effect is significant to the value of the vibration characteristics. The increase of the inlet closure level can cause the quadratic decrease of the values of the vibration characteristics. In addition, the increase of the inlet closure level had no impact on the applied resonance frequency levels. These experimental results obtained the highest values of the vibration characteristic at the inlet closure level of 25%. 

scholarly journals OPTIMIZATION PROCESS OF PRODUCTION PLANNING METHOD OF THE EXPERIMENT

2017 ◽  
Vol 2 (3) ◽  
pp. 139-144
Author(s):  
Серых ◽  
Inna Serykh ◽  
Черноситова ◽  
Elena Chernositova ◽  
Чернышева ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Production Planning ◽  
Fat Content ◽  
Planning Method ◽  
Factorial Experiment ◽  
Optimization Process ◽  
Technological Parameters ◽  
Full Factorial Experiment ◽  
Full Factorial ◽  
Selection Of

The results of the planning and implementation of a full factorial experiment on the selection of technological parameters of production special, providing the required values of fat. The results of the regression analysis allow to identify and assess the influence of components on the fat content of the product process. Set values of technological parameters, allowing to obtain the desired value of the investigated parameter.

Principles of exposure of polymer materials to heat, moisture and UV-radiation and study of their properties by full factorial experiment: A review

2021 ◽  
pp. 146-160
Author(s):  
A. B. Laptev ◽  
A. S. Nesterov ◽  
A. M. Vardanyan ◽  
A. M. Vardanyan
Keyword(s):  
Uv Radiation ◽  
Climatic Factors ◽  
Initial Period ◽  
Amorphous State ◽  
Surface Oxidation ◽  
Polymer Chains ◽  
Factorial Experiment ◽  
Polymer Materials ◽  
Full Factorial Experiment ◽  
Full Factorial

The work is dedicated to the effects of climatic factors on polyethylene terephthalate (PET) in terms of changes in the structure and interaction of polymer molecules. The kinetic concept of the strength of PET has been developed, and the factors influencing the strength have been considered. Effects of moisture, thermal oxidative destruction, and UV-radiation on the structure of PET have been investigated. Polymers’ properties predicting, durability and their computer modeling have been analyzed. A model of changes in PET properties under the influence of temperature, moisture and UV-radiation was constructed using the methods of a full factorial experiment. It has been shown that in the initial period of exposure, adsorption and diffusion of moisture, hydrolysis and surface oxidation occur; prolonged and constant exposure to UV-radiation break the bonds formed by moisture, then the C–C and C–O bonds in the PET molecule brake and new intermolecular bonds are formed. In the amorphous state of PET, the breaking of bonds in the polymer chain and the formation of bonds between two adjacent polymer chains, the formation of more densely packed nodes, the destruction of the polymer and its aging, are equally probable. Temperature has a secondary effect, facilitating both hydrolysis and oxidation and polymer degradation.

scholarly journals The influence of technological parameters for the production of plasticized polyvinylbutyral films on their optical and physico-mechanical properties

2019 ◽  
pp. 7-8
Author(s):  
M. M. Egorov ◽  
V. I. Milov ◽  
M. K. Timin ◽  
T. P. Mukhina ◽  
V. S. Smirnov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mathematical Analysis ◽  
Polyvinyl Butyral ◽  
Factorial Experiment ◽  
Regression Equations ◽  
Technological Parameters ◽  
Full Factorial Experiment ◽  
Effect Of Pressure ◽  
Direct Pressing ◽  
Full Factorial

The effect of pressure, temperature and time during direct pressing on the strength and optical characteristics of adhesive plasticized polyvinyl butyral films is studied. A mathematical analysis of the results of a full factorial experiment is carried out and the regression equations are derived.

scholarly journals Influence of application parameters of ultrasonic-assisted bone instruments on the tear force of a substitute material for spinal dura mater

2018 ◽  
Vol 4 (1) ◽  
pp. 611-614
Author(s):  
Marie C. Foelkel ◽  
Vitali Herzog ◽  
Markus Meier ◽  
Michael M. Morlock
Keyword(s):  
Dura Mater ◽  
Spinal Surgery ◽  
Nerve Tissue ◽  
Cnc Machine ◽  
Full Factorial Experiment ◽  
Critical Areas ◽  
Ultrasonic Assisted ◽  
Substitute Material ◽  
Dural Tears ◽  
Full Factorial

AbstractAn ultrasonic-assisted bone instrument can be used for the dissection of bone in spinal surgery. During surgery, the tip of such a bone instrument can touch spinal dura mater. Especially during critical re-operations, high forces can be unintentionally applied on spinal dura mater. To prevent dural tears, the influence of application parameters on the tear force shall be analyzed. Collagen foil is used as a substitute material for spinal dura mater because of its similar mechanical properties and structure. Sponge cloth is placed below collagen foil to imitate cerebrospinal fluid and nerve tissue. A 3-axis CNC-machine is used to automate the movement of the bone instrument. In a full factorial experiment the influence of amplitude, shape of movement and velocity of movement on the tear force is analyzed. Amplitude has the strongest effect because of the increase in input energy. Velocity also has a significant influence, probably because of the strain rate increasing with velocity. Thus, a surgeon should mainly reduce the amplitude and furthermore the velocity of movement to generate higher safety in critical areas.

Bonding Strength and Microstructure of SnAg-Based Solid Liquid Inter-Diffusion Bonds

2009 ◽  
Author(s):  
Leila J. Ladani ◽  
Jafar Razmi
Keyword(s):  
Ternary System ◽  
Process Parameters ◽  
New Technology ◽  
Full Factorial Experiment ◽  
3 Dimensional ◽  
Diffusion Bonds ◽  
Pressure Time ◽  
Solid Liquid ◽  
Full Factorial ◽  
Melting Material

Solid Liquid Inter-diffusion (SLID) is a new technology used as interconnects in high density and 3 dimensional packages. This manuscript investigates effect of process parameters, pressure, time and temperature on the strength of bonds and microstructure produced using this technology. A full factorial experiment is designed and implemented on the process with these 3 variables at 3 levels using Sn3.5Ag. Bonds’ strength were then measured using a micro-tester and load displacements were monitored. This analysis shows that SLID bonds form at temperatures much higher than melting temperature of the low melting material. It also shows that time is a significant factor. Bonds that are formed under 10 minutes of time do not show a significant amount of intermetallics. Although the elemental percentage of copper is high in the middle of the bond, it does not reach enough to form any of intermetallic compounds of this ternary system. The specimens fabricated under longer time around 1 hour showed a more brittle, intermetallic like behavior.

Low-Cycle-Fatigue Crack Closure Effect of Ship Cracked Plate Considering the Accumulative Plastic Damage

2019 ◽  
Author(s):  
Yuelin Song ◽  
Ping Yang ◽  
Ziya Peng ◽  
Wei Jiang ◽  
Kang Hu
Keyword(s):  
Stress Field ◽  
Compressive Stress ◽  
Crack Closure ◽  
Low Cycle Fatigue ◽  
Crack Tip ◽  
Cycle Fatigue ◽  
Plastic Damage ◽  
Closure Effect ◽  
Closure Level ◽  
The Relationship

Abstract In this paper, the relationship between crack closure level and the crack length is studied with experiment and numerical simulation under different low cycle fatigue (LCF) loads. The evolution mechanism of crack closure behavior is explored through the variations of the accumulative plastic strain and compressive stress near the crack-tip. The compressive residual stress is separated into two parts for comparative analysis, namely: the stress field ahead of the crack tip and the stress field of the wake region. The magnitude of the compressive stress field is obtained by the integration along the crack propagation direction of the normal stress. The results show that there is an excellent correlation between LCF crack closure level and the magnitude of the compressive stress in the plastic wake, which provides a new way to further study the complex mechanism of crack closure under LCF loads.

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