scholarly journals The physical and mechanical properties of potato (Solanum tuberosum L.) tubers as related to the automatic separation from clods and stones

2019 ◽  
Author(s):  
Ghasem Abedi ◽  
Shamsollah Abdollahpour ◽  
Mohammad Reza Bakhtiari
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Friction ◽  
Solanum Tuberosum L ◽  
Physical And Mechanical Properties ◽  
Rolling Resistance ◽  
Potato Tubers ◽  
Frictional Properties ◽  
Static Coefficient Of Friction ◽  
Mass Volume ◽  
Static Coefficient

In the current research, some of the mechanical and physical properties of two industrial varieties of potato tubers that have a prominent role in the mechanised separation process from clods and stones were investigated. These properties include the physical dimension, mass, volume, sphericity, surface area, density, projected areas and Young’s modulus. In addition, the static coefficient of friction and rolling resistance for tubers on five surface materials were determined. The tuber’s size positively affected the physical and mechanical properties of the tubers. The frictional properties of the tubers were affected by the tuber size, the surface type, and the interaction between them. The results showed that most of the apparent properties for the Sante variety were greater than those of the Marfona variety. The static coefficient of friction for the tubers on a wood surface was the maximum and was the minimum value on a galvanized sheet, but for the tuber’s rolling resistance, the results were inversed. The results proposed that the automatic separation of the potato tubers from the impurities using the properties of the crop is possible.

Some Physical and Mechanical Properties of Sugarcane Trash Relating to the Criteria Design of a Sugarcane Trash Chopping Machine

2014 ◽  
Vol 931-932 ◽  
pp. 1574-1581
Author(s):  
Nirattisak Khongthon ◽  
Somposh Sudajan
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Coefficient Of Friction ◽  
Physical And Mechanical Properties ◽  
Unit Weight ◽  
Shearing Force ◽  
Moisture Contents ◽  
The Mean ◽  
Static Coefficient Of Friction ◽  
Static Coefficient

The physical and mechanical properties of sugarcane leaves were necessary for the design consideration of the relating storage, handling and processing equipment. The sugarcane trash at moisture contents of 23.40 and 73.91 % w.b. were used for this study. The mean length and unit weight of sugarcane trashes were 168.63 cm and 65.87 grams respectively. The average number of leaf of each sample was 4. The mean diameter of the thrash top, width and thickness increased with the increase of moisture from 23.40 and 73.91 % w.b.. The average leaf angles (β) relative to the horizontal plane of the first left leaf, second left leaf, first right leaf and second right leaf were 65.10, 73.36, 71.07 and 78.26 degrees for 73.91 % w.b., and 66.33, 73.50, 67.50 and 75.83 degrees for 23.40 % w.b. respectively. When the moisture content increased from 23.40 to 73.91% w.b., the static coefficient of friction increased from 0.30 to 0.43, 0.38 to 0.41, 0.30 to 0.37 and 0.54 to 0.66 for plywood, mild steel, galvanized iron and rubber plate respectively. The least static coefficient of friction occurred on the galvanized iron plate. The results from experimenting on mechanical properties showed that the maximum shearing force increased with the increase in moisture content from 23.40 to 73.91% w.b. respectively. The maximum shearing force was 360.15 and 457.32 N for moisture contents of 23.40 and 73.91% w.b.. The maximum tensile force decreased toward upper region of the leaf for both 23.40 and 73.91% w.b.. The results of this study would be useful for the design and optimization of the equipment associated with harvesting, threshing, chopping and processing.

Physical-Mechanical Properties and Chemical Composition of Balangu (Lallemantia royleana (Benth. in Walla.)) Seed

2008 ◽  
Vol 4 (5) ◽  
Author(s):  
Seyed Mohammad Ali Razavi ◽  
Toktam Mohammadi Moghaddam ◽  
Asad Mohammad Amini
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Moisture Content ◽  
Crude Protein ◽  
Geometric Mean ◽  
Physical And Mechanical Properties ◽  
Terminal Velocity ◽  
Average Unit ◽  
Static Coefficient Of Friction ◽  
Static Coefficient

Physical and mechanical properties of Balangu seed and other crops are necessary for the design of equipment to handling, transporting, processing and storing. In this paper, physico-mechanic properties and chemical composition of Balangu seed have been determined at a moisture content of 7.82% (d.b.). The results showed that the seeds contained averagely amounts of dry matter (92.75%), ash (3.63%), crude protein (25.60%), crude fat (18.27%), crude fiber (1.29%), NDF (30.67%) and ADF (47.80%). The average values of length, diameter, geometric mean diameter, sphericity and surface area were established as 3.148 mm, 0.720 mm, 1.176 mm, 37.4% and 4.362 mm2, respectively. The average unit mass, thousand mass, true and apparent volumes, true density, bulk density, porosity, terminal velocity and filling and emptying angles of repose were determined as 0.0016 g, 1.67 g, 1.51 mm3, 2.467 mm3, 1046.68 kg/m3, 739.50 kg/m3, 29.19% and 4.05 m/s, 27.24°, and 17.23°, respectively. The static coefficient of friction varied from 0.221 on glass to 0.432 on rubber. In the same moisture content, the average rupture force, hardness and toughness obtained 1482.06 g, 3280.76 g, 12902.83 gs, respectively.

Determining the Coefficient of Friction for Rolling Disks

1978 ◽  
Vol 100 (1) ◽  
pp. 25-30
Author(s):  
D. H. Offner ◽  
N. Tomita
Keyword(s):  
Potential Energy ◽  
Coefficient Of Friction ◽  
Surface Deformation ◽  
Empirical Relationship ◽  
Rolling Resistance ◽  
Experimental Results ◽  
Testing Device ◽  
The Coefficient Of Friction ◽  
Static Coefficient Of Friction ◽  
Static Coefficient

A method and testing device for determining a coefficient of friction for rolling disks is described. The method equates the energy of rolling resistance to the change in potential energy of a moving system. The experimental results of applying this method to steel, aluminum, and plexiglass disks of 3.8, 2.5, and 1.7 cm radii and 1 cm width rolling on steel and aluminum bases are summarized. An empirical relationship between the coefficient of friction and energy of surface deformation is presented. Use of device for determining the static coefficient of friction for impending rolling and sliding of disks is discussed.

scholarly journals Engineering Properties of Peeled and Unpeeled Multiplier Onion

2020 ◽  
Vol 8 (3) ◽  
pp. 232-238
Author(s):  
Dawn C.P. Ambrose
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Coefficient Of Friction ◽  
Angle Of Repose ◽  
Engineering Properties ◽  
True Density ◽  
Crushing Strength ◽  
Frictional Properties ◽  
Allium Cepa L ◽  
Multiplier Onion

Multiplier onion (Allium cepa L. var aggregatum. Don.) is mainly used for its unique flavour in seasoning dishes. The unpeeled onions are processed at farm level by means of primary processing and by secondary processing various products like paste, flakes, powder could be produced from peeled onions. For the design of processing and handling equipment knowledge of engineering properties is essential. The engineering properties of peeled and unpeeled multiplier onion were determined. The average values of the physical properties of unpeeled onion were recorded for bulk density and true density as 636.621 and 1526.825 kg/m3 respectively. Similarly for peeled onions, the bulk and true density were 627.03 and 1108.74 kg/m3 respectively. The moisture present in peeled and unpeeled onion was 77.66 % and 74.43% (w.b) respectively. The TSS of multiplier onion was found to be 20° Brix for both peeled and unpeeled samples. The colour values were also measured using colour flex meter for the peeled and unpeeled onions. The frictional properties including coefficient of friction, filling and emptying angle of repose were also measured. Mechanical properties were determined by using a texture analyser. The firmness was measured in terms of penetrating force and crushing strength which were recorded to be 8.59 N and 124.93 N respectively for peeled and 12.00 N and 138.35 N respectively for unpeeled onions.

scholarly journals DETERMINING THE COEFFICIENT OF FRICTION OF WOOD-BASED MATERALS FOR FURNITURE PANELS IN THE ASPECT OF MODELLING THEIR SHREDDING PROCESS

Wood Research ◽  
2021 ◽  
Vol 66 (5) ◽  
pp. 789-805
Author(s):  
MATEUSZ KUKLA ◽  
ŁUKASZ WARGUŁA ◽  
ALEKSANDRA BISZCZANIK
Keyword(s):  
Coefficient Of Friction ◽  
Kinetic Coefficient ◽  
Drive Unit ◽  
Base Surface ◽  
The Coefficient Of Friction ◽  
Kinematic Coefficient ◽  
Cutting Processes ◽  
Static Coefficient Of Friction ◽  
Static Coefficient ◽  
Selection Of

In order to improve the power selection of the drive unit for the shredding machines,theauthors determine the values of friction coefficients used in the cutting force models. These values consider the friction between steel and such wood-based materials as chipboard, MDF and OSB. The tests concern laminated and non-laminated external surfaces and surfaces subjected to cutting processes. The value of the coefficient of friction for the tested materials is in the range: for the static coefficient of friction 0.77-0.33, and for the kinetic coefficient of friction 0.68-0.25. The highest values of the static and kinematic coefficient of friction were recorded for MDF (non-laminated external surface) and they were equal respectively: 0.77 and 0.68. In turn, thesmallest values of the discussed coefficients were recorded for chipboard (laminated external wood-base surface), which were at the level of 0.33 and 0.25, resp.

Morphological Characteristics and Physical & Mechanical Properties of seeds of small-seeded crops

2020 ◽  
pp. 27-35
Author(s):  
Elchyn Aliiev ◽  
◽  
Christina Lupko ◽  
Keyword(s):  
Mechanical Properties ◽  
Coefficient Of Friction ◽  
Morphological Characteristics ◽  
Physical And Mechanical Properties ◽  
Specific Weight ◽  
Test Material ◽  
Effective Diameter ◽  
Morphological Parameters ◽  
Separation Processes ◽  
The Coefficient Of Friction

To create a database and systematize the seeds of samples of small-seeded crops, it is necessary to determine the patterns of influence of morphological parameters on their physical and mechanical properties. The development of the latest technologies and technical devices for cleaning and separation is possible due to the understanding of the characteristic morphological parameters for each of the small-seeded crops. The aim of the research is to determine the physical and mechanical properties of the seed material of small-seeded crops (mustard, flax, ryegrass, rapeseed), necessary to increase the efficiency of their cleaning and separation processes. To achieve this goal, a plan of experimental research was developed, which provided for the determination of physical and mechanical parameters of seeds of small-seeded crops, namely: indicators that characterize the flowability of seeds (angle of natural bias); frictional properties of seeds (static coefficient of friction); porosity (density) and density; size and mass characteristics of seeds (length, width, thickness, effective diameter, weight of 1000 seeds). It is established that the physical and mechanical properties of seeds of small-seeded crops are greatly influenced by its humidity. With increasing humidity, the performance of the test material increases. This is due to the fact that with increasing humidity, the shape of the seed almost turns into a spherical, which, in turn, leads to an increase in the curvature of the surface and reduce the points of contact between the seeds. As a result, the angle of natural inclination increases. The coefficient of friction of seeds of small-seeded crops depends on the roughness of the friction surface and decreases with increasing humidity. This is due to the fact that with increasing humidity decreases the forces of molecular attraction of the seed coat to the surface of the material. Seed density increases with increasing humidity. From this we can conclude that the absorption of moisture by the investigated material increases the total weight of the seed, and as a result - increases its specific weight.

scholarly journals Measuring the Static Coefficient of Friction of Non-Fluid Contaminants

2019 ◽  
Vol 63 (1) ◽  
pp. 537-541
Author(s):  
Hunter DeBusk ◽  
Levi Dixon ◽  
Joellen Gill ◽  
Richard Gill
Keyword(s):  
Coefficient Of Friction ◽  
Human Subjects ◽  
Small Samples ◽  
Subjective Ratings ◽  
Slip Event ◽  
Materials Used ◽  
Static Coefficient Of Friction ◽  
Static Coefficient ◽  
Porcelain Tile ◽  
Floor Material

The purpose of our study was to evaluate whether there are differences between measuring the static coefficient of friction (SCOF) of a non-fluid contaminant when it is directly attached to a tribometer test foot, or “Attached”, versus when it is lying loose on the floor, or “Loose”. The non-fluid materials used in this study included Mylar, Cardboard, Terrycloth Bathmat, and Terrycloth Bathmat with Rubberized Silicon Backing; the floor material was porcelain tile. In addition, 10 participants subjectively rated the “slipperiness” of each material by pushing the materials with one foot across the porcelain tile. The findings of this study revealed that within each technique, Attached and Loose, the measurements were consistent and reliable. Furthermore, both techniques resulted in identical ordering of the materials from lowest to highest SCOF, which was verified by the human subjects’ subjective ratings of slipperiness. However, the Loose technique SCOF values were slightly but consistently greater than the Attached technique SCOF values; the Loose tests of the entire bathmats were found to have greater SCOF values when compared to Loose tests of small samples. These findings suggest that when investigating a specific slip event, a practitioner should measure the SCOF of the non-fluid contaminant using the technique which most closely represents the conditions of the slip event.

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