Increase In Peripheral Speed Research Articles

Study on Measurement Method of Oil Film Thickness at EHL Contact Point in Traction Drives under High Speed by Using GMFT Method

In recent years, high-speed motors combined with traction-type reduction reducers have been considered to reduce the size and weight of electric vehicle power systems and increase their efficiency. A traction drive is a device that applies a strong load to two rolling elements and transmits power through the resulting EHL contact point. However, there is a concern that the increase in peripheral speed causes an increase in the thickness of the oil film in the contact point, resulting in a decrease in the transmission of power. In this study, the GMFT method, which enables one-shot measurement, was combined with a high-speed color camera to successfully capture the outline of the contact point under higher speed conditions than in existing studies.

Development of Motorized Walnut Dehuller

Most of walnut production is manually hulled in India. Green walnut is processed in dry condition by removing the outer shell. Removing of outer shell of walnut with a knife by hand is difficult at a low production rate of 0.025- 0.030 t.h-1. A motorized walnut dehuller based on the principle of shearing-off the hull of a green walnut by shearing force was developed and evaluated, with peripheral speed and number of heaping days being optimized to make the best quality of hulling process. Results indicated that the effective throughput capacity, hulling efficiency and fully hulled walnut percentage increased with increase in peripheral speed. Similarly, hulling efficiency increased with increase in number of heaping days before hulling, but the fruit shell staining and kernel discoloration took place with increase in the number of heaping days after harvest. At peripheral speed of 6.41 m.s-1 and 4-day heaping period, the hulling capacity of the developed machine was 0.260 t.h-1 with hulling efficiency of 79.55 per cent.

Development of stripper harvester for paddy

Konkan is the coastal part of Maharashtra between Western Ghat and Arabian seacoast. Rice is a major crop grown over 3.86 lakh hectares. Stripper harvesting technology, which strips only seeds and keeps straw erect-ed in the field present bright prospect for the development of small, light, efficient mechanism by reducing number of operation with increased capacity and lesser power compared to conventional cutter bar combine harvester. The big machines like combine harvester and high capacity threshers for harvesting and threshing have limitations. A proto-type of paddy stripper harvester was developed considering the limitation of Konkan like small, fragmented land, hilly, terrace farming and high rainfall. It consisted of stripping mechanism, grain tank, hydraulic system, steering system, gear box, engine, cage wheel and chassis. The arrangement of V-belt and set of pulleys were made to transmit power from gear box to stripper rotor. The effect of forward speed and peripheral speed on shattered and un-stripped grain loss was studied. The shattered grain loss was decreased with increase in forward speed whereas decreased initially and then increased with increase in peripheral speed. The un-stripped grain loss was decreased with increase in forward and peripheral speed. The performance of the developed prototype was found better at forward speed of 2.25 km/h and peripheral speed of 19.78 m/s. During final testing of prototype, shattered and un-stripped grain loss was found 5.95 and 1.89 %, respectively. The average field capacity and field efficiency of paddy stripper harvester machine was found 0.14 ha/h and 69.38 per cent respectively.

Design and Development of Wooden Plate Metering Device for Onion Bulb Planter

An inclined plate metering device for onion bulb planter was developed and its performance was evaluated in CAE, Lab, JNKVV, Jabalpur. Elevating error, cell fills, bulb damage, actual planting distance, mean planting distance, planting error and feed index were evaluated under the different peripheral speed of the rotor with respect to 3 angular positions of metering plate. It was found that elevating error was minimum (1.51%) at the metering plate inclination of 50° compared to 60° and 70° at the peripheral speed of 7.6 m/min. The cell fill was maximum (100.38%) due to double feed at the inclination angle of 50° compared to 60° and 70° at the peripheral speed of 7.6 m/min but the bulb damage was found nil at the inclination angle 500 at a peripheral speed 7.6 m/min. The bulb damage increases with an increase in peripheral speed of the rotor and actual planting distance, mean planting distance, planting error was minimum 10.79 cm, 11.08 cm, 1.92 cm respectively, with a maximum feed index of (93.17%) at minimum travel speed 0.6 km/h. However, the actual planting distance, mean planting distance, planting error increased and feed index decreased with the increase in travel speed, but the cell fill decreased with the increase in peripheral speed at all inclination positions.

Performance Evaluation of a Centrifugal Peeling System for Pistachio Nuts

In this paper, performance evaluation of the centrifugal peeling system for pistachio nuts was studied as a function of moisture content (in five levels: 4.10, 10.50, 28.50 and 36.10 % d.b) and peripheral speed of separate rotating circular base – plate (in four levels: 35, 40, 45 and 50 m/s) in a factorial design based on completely randomized block. The overall performance was expressed in terms of peeling efficiency and breakage percent. Peeling efficiency and breakage increased with (i) increase in peripheral speed (ii) decrease in the pistachio moisture content. The results of an optimization technique revealed that the best peeling performance could be obtained if the machine is operated at peripheral speed of 50 m/s and moisture content of 4.10 % d.b. Under these conditions, the values of peeling efficiency and breakage percent were 96.5 and 8.7 %, respectively.

Jig Grinding of Alloy Tool Steel with Electrodeposited CBN Wheels. Effects of Grinding Conditions on Grinding Characteristics.

Jig grinding is well known as a precision internal machining process for high precision products such as dies and fixtures. Investigation to realize high productivity and high accuracy is performed with different electrodeposited CBN wheels under various grinding conditions. Grinding characteristics such as grinding forces, torque and surface roughness were measured. The main results obtained are as follows. (1) Grinding accuracy improved with an increase in peripheral speed of grinding wheel. (2) Grinding forces and torque decrease with an increase in peripheral speed of wheel but increase with wheel depth of cut and work feed rate. (3) Grinding forces and torque increase with the cumulative stock removal which is caused by the progress of attritional wear of CBN abrasive grains. (4) A clear reduction of grinding forces is caused by quill motion overlapping the main axis and is induced by the decrease in the mean chip volume and/or the mean chip cross-sectional area.

A COMPARISON OF THE THEORY WITH THE EXPERIMENT OF THE VISCOELASTIC BEHAVIOR OF ROTATING RUBBER-COVERED ROLLES

The nip width and the driving torque were measured during rotation of metal and rubber-covered rollers under dead weight and with constant peripheral speed. The characteristic values of mechanical model of the cover were also decided from the measurement of the dynamic modulus and tan δ of the rubbers, and a comparison of the dynamic mechanical characteristic of model with them was made.Comparing the experimental results with the calculated ones using the method explained in the previous paper, the following conclusions were obtained:(1) In our test apparatus the center distance between the rollers changes with peripheral speed, particularly when soft rubber is used. Thus our theory is compared with the experiments of hard rubber-covered rollers.(2) The nip width during rotation is smaller than that of standing still, and it decreases with an increase in peripheral speed.(3) For soft rubber-covered rollers the rolling friction increases with an increase in peripheral speed, and for rollers covered by hard rubber it is constant or decreases in the high range of speed.(4) The experimental results do not coincide with the calculated ones. The disagreement is considered to arise from the fact that the characteristic values of mechanical model are decided on the basis of the measurement of the dynamic modulus of the cylindrical test pieces, where the free deformation of the test piece is allowed.

動的条件下におけるNi, Cuの液体Biへの溶解現象

A kinetic study of the dissolution of solid Ni and Cu in liquid Bi has been made under the dynamic and isothermal conditions. The experiments were carried out at given temperatures in the range of 370°∼475°C and at constant peripheral speeds of rotating solid specimen in the range of 0∼52 cm/sec, following the dissolution process was examined by analyzing the whole sample drawn from a reaction vessel after the predetermined time of dissolution. The rates of dissolution of Ni and Cu in liquid Bi thus obtained have been found to conform to an unimolecular reaction law expressed in the form of n=ns{1−exp(−k·S⁄V·t)}, which is identical to one applied previously to these systems under the static condition. The values of the solution rate constant obtained for both systems were significantly higher than those under the static condition and increased in proportion to about six-tenths power of the peripheral speed. From these facts it was confirmed that the rates of dissolution of Ni and Cu in liquid Bi can be determined by the rate of transfer of dissolved particle through the diffusion layer in solid-liquid interface. It was also shown that the evaluated values of activation energy for dissolution of both systems were appreciably lower than those obtained under the static condition and decreased slightly with the increase in peripheral speed. These results are reviewed on the basis of the diffusion mechanism in liquid.