Application of quantitative measures for analysing aircraft handling qualities

The ease and precision with which pilot is able to handle the designated task determines the aircraft’s handling qualities. Accordingly, the most common methodology for determining aircraft’s handling qualities is through pilot opinions or through questionnaires. These subjective means of analysis is not reliable as the sole source of judgments. Quantitative metrics to analyse the task difficulty based on pilot’s performance, supplemented with subjective decision, can provide better insight into pilot workload levels and in turn the aircraft’s handling qualities. The application of few objective performance measurement techniques to flight data of a high performance fighter aircraft is discussed. Pilot/aircraft’s performance under different configurations is analysed. Analysis results show that pilots usually tend to give more priority to pitch axis in case of dual axis tracking task. And pilots are therefore more aggressive in accomplishing pitch axis tracking task than in roll. Workload assessments were also performed by comparing the results of single axis tracking experiments conducted using a high fidelity flight simulator with the flight data. It is seen that pilot’s aggressiveness levels in controlling the roll control inceptor is significantly less, with improved tracking accuracy when exercised as the primary tas

Application of Quantitative Measures for Analysing Aircraft Handling Qualities

The ease and precision with which pilot is able to handle the designated task determines the aircraft’s handling qualities. Accordingly, the most common methodology for determining aircraft’s handling qualities is through pilot opinions or through questionnaires. These subjective means of analysis is not reliable as the sole source of judgments. Quantitative metrics to analyse the task difficulty based on pilot’s performance, supplemented with subjective decision, can provide better insight into pilot workload levels and in turn the aircraft’s handling qualities. The application of few objective performance measurement techniques to flight data of a high performance fighter aircraft is discussed. Pilot/aircraft’s performance under different configurations is analysed. Analysis results show that pilots usually tend to give more priority to pitch axis in case of dual axis tracking task. And pilots are therefore more aggressive in accomplishing pitch axis tracking task than in roll. Workload assessments were also performed by comparing the results of single axis tracking experiments conducted using a high fidelity flight simulator with the flight data. It is seen that pilot’s aggressiveness levels in controlling the roll control inceptor is significantly less, with improved tracking accuracy when exercised as the primary task.

Effect of fertigation on growth and yield on Chilli hybrid Arka Meghana

A field experiment was conducted to study the effect of fertigation on chilli F1 Hybrid Arka Meghana during kharif of 2017 and 2018, with ten treatments, including different doses, sources of fertilizers and its frequency of application, in randomized block design with three replications. The pooled analysis revealed that application of fertilizer dose (125:100:125 kg N: P2O5: K2O ha-1) through fertigation on bi-weekly basis resulted in higher plant height (76.3 cm) at 80 days after transplanting, which was on par with the same dose and source applied at weekly interval (74.0 cm). These two treatments recorded higher fruit length (12.63 and 12.27 cm), number of fruits per plant (153.33 and 169.67) and dry weight of 10 fruits (9.00 and 8.63 g), respectively. All the fertigation treatments recorded higher yields over the conventional soil application of fertilizers to the tune of 14.84 to 61.55%. Among the fertigation treatments, application of 100% of fertilizer dose using water soluble fertilizers at bi-weekly interval resulted in significantly higher yield (32.44 t ha-1) compared to all treatments except the treatment where the weekly application of same dose of fertilizer through the same sources (31.81 t ha-1) and 75% of 125:100:125 kg N: P2O5: K2O ha-1 was applied weekly or bi-weekly intervals (29.23 and 30.01 t ha-1). Biweekly and weekly application of 100% fertilizer dose of 125:100:125 kg N: P2O5: K2O ha-1 through fertigation could yield maximum net income (Rs. 400151 and Rs. 387551 ha-1) with B: C (1.61 and 1.56). However, fertilizer applied to soil resulted in minimum net income of Rs.183054 ha-1 and B: C (0.84)

Effect of Microsprinkler Fertigation on Growth and Yield of Rabi Onion

A field experiment was conducted during rabi 2005-2006 at Indian Institute of Horticultural Research, Bangalore, to study the performance of onion cv. Arka Niketan as influenced by microsprinkler fertigation using different sources and levels of fertilizers. Results indicated that crop growth in terms of leaf production, plant height, radial and equatorial diameter was not significantly influenced by the treatments. Fertigation treatments were superior for marketable bulb yield as compared to soil application of fertilizer. Also bulb yield through soil application of fertilizer increased by changing over from surface-irrigation to microsprinkler irrigation. However, bulb yield did not significantly decrease by applying just 75% of the recommended NPK fertilizers, using common or water soluble fertilizers supplied through fertigation. For achieving maximum yield, however, it is recommended to apply 100% recommended dose of fertilizers through sprinkler fertigation using water soluble fertilizers

Influence of Various Sources and Levels of Fertilizer Applied through Fertigation on Hybrid Watermelon Grown in Rabi-Summer

A field experiment was conducted at Bangalore during 2006-2008 to study the effect of fertigation on growth and yield of rabi-summer grown watermelon. Seven treatments comprising varying rates and sources of fertilizers were applied. Application of water soluble fertilizer @ 70:70:70kg N:P2O5:K2O per hectare through fertigation gave significantly higher vine length, number of branches per plant and leaf area index. In general, fertigation treatments recorded higher values for number of fruits per plant, fruit weight and total soluble solids than conventional soilapplication of fertilizers. All the fertigation treatments recorded higher average marketable watermelon yield over conventional soil-application of fertilizers amounting to 7.22 to 26.4% increase. Among fertigation treatments, though recommended dose of fertilizer applied as water soluble fertilizer resulted in highest marketable-fruit yield, highest net income (Rs. 229775) and B:C ratio (3.03) was obtained in treatment with 70% of recommended dose of NPK using conventional fertilizers supplied through fertigation

Quantification of yield gaps in rain-fed rice, wheat, cotton and mustard in India

Rainfed farming / Crop yield / Simulation / Rice / Wheat / Cotton / Mustard / India