Hand calculations, finite element (FE) analysis and experimental validation of chassis mounted platform design for defence and commercial off-road vehicles have been attempted in this work. The work was commenced with the thorough study of platform configuration, loading pattern, platform mount location & configuration on the vehicle chassis and relevant vehicle characteristics. Calculation of section modulus, shear force and bending moment of various structural members under specified loading has been carried out before proceeding with the FE modeling and analysis of platform. FE model of the chassis mounted platform has been made using shell elements and the boundary conditions have been imposed based on the loading pattern with an assumption of rigid vehicle chassis. Static and gradient analyses of the platform have been carried out for full scale and reduced scale prototype FE models. Experimental strain measurement at critical locations under different static and gradient loads has been carried out for design validation of chassis mounted platform using the scaled prototype. Close correlation has been found between the experimental stress values and FE stress analysis results for static and gradient load conditions. From the entire load tests conducted, it is observed that the strain values in rear portion are less as compared with those in front and mid portions of the platform in-spite of the rear overhang provision.
By continuous and rapid growth in industrialization
as well as population, the agricultural lands are also becoming
less and less continuously day by day which results in increase in
the population of small land holders. In addition to this, because
of continuous decreasing production the youth of the villages are
also migrating in big cities for the employment, resulting
decreasing manpower essential to perform various seedbed
operations in the villages. Hence, it is the need of time for small
farmers having small agricultural land and having less crop
production to introduce the cost-effective farm mechanization so
that they can improve production rate. Rotavator is the best
option available to achieve this landmark as it is already proved
that seedbed prepared by using rotavator gives highest benefit to
cost ratio. For this experimental study the whole land of 9 acre
area is divided into 18 plots of equal size in area. The
combination of method of seedbed preparation and use of
fertilizers were the preliminary criteria. The categories of
fertilizer according to quantity are discussed earlier which are
50kg, 35kg and 65kg per acre respectively. The quantities of
organic fertilizer used are 45kg and 60kg per acre of agricultural
land for both seedbeds which are prepared manually and by
using rotavator. The highest production of Pigeon Pea was
obtained of 814kg was from the plot whose seedbed is prepared
by using agricultural machine called rotavator and organic
fertilizer; next highest production is obtained of 802 kg from the
plot whose seedbed is prepared by using rotavator and the
fertilizer used was chemical fertilizer. The minimum production
of Pigeon Pea which is 690 kg was obtained in the plot whose
seedbed was prepared manually and chemical fertilizer was
used.
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