61 research outputs found

    Predictive maintenance and fault diagnosis of hydraulic gear coupling of a boiler feed pump unit

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    Increasing demand for reliability and performance of today’s most complex machines, and maintaining high productivity without sacrificing product quality have made it imperative for maintenance engineers to devise newer strategies in maintenance of plant and machinery. One of such strategies is condition monitoring, which has emerged as one of the most powerful technology in maintenance engineering. Condition monitoring and diagnostic engineering is a novel concept which enables us to detect in advance any incipient failure with ease and confidence in any part of a dynamic system before such failure trigger – off various types of failure mechanisms, which in turn may render the whole system uneconomical, unreliable, unhealthy, unsafe and even lethal. The present work highlights an experimental investigation to monitor the vibration behavior of hydraulic gear coupling, which is a part of Boiler Feed Pump train of a large utility Thermal Power Plant.  The coupling is supported by 4 Bearings. Tri-axial measurements are made at the bearing supports for 12 months. Displacement and Velocity are measured along Horizontal, Vertical and Axial directions. The experimental data is plotted on Time domain for graphical analysis to ease viewing of vibration signals. Based on the experimental data, faults are diagnosed using ISO – 2372 standards and causes are predicted. It is observed that the front and rear bearings of Input and output shafts of coupling are experiencing excess vibration. The work is concluded by suggesting remedial measures to ensure vibration intensity, at the said points, within the safe limits.&nbsp

    Optimized Coefficients of Interpolation Filter To Adapt Statistical Property of Each Image

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    Spatial transform has assumed an essential part in most picture and video coding routines. Wavelet change has numerous points of interest, for example, multi-determination representation, great vitality compaction and de-correlation. We propose another weighted versatile lifting (WAL)- based wavelet change that is intended to take care of the issues existing in the past versatile directional lifting (ADL) approach. The proposed methodology utilizes the weighted capacity to ensure that the prediction and update stages are predictable, the directional addition to enhance the introduction property of added image, and adaptive interpolation filter to adjust to statistical property of each image

    SIMULATION AND PERFORMANCE ANALYSIS OF CNG FUELED HCCI ENGINE

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    ABSTRACT Compressed Natural Gas (CNG) is a difficult fuel to use in a Homogenous Charge Compression Ignition (HCCI) engine because of high octane number, high auto-ignition temperature, and rapid heat release. These properties force CNG HCCI engines to use extreme levels of intake heating. The Homogeneous Charge Compression Ignition concept has the potential to meet the need for a high efficiency and low emission engine. Fluent is one of the promising operating tools in the computational fluid dynamics. In the present study the Computational Fluid dynamics (CFD) code FLUENT is used to model complex combustion phenomenon in homogeneous charge compression Ignition engine. The variation of various properties like the peak cylinder pressure, peak cylinder temperature at various crank angles, at different relative air fuel mixture inlet temperatures and with hemi spherical combustion chamber and toroidal bowl has been studied. It was found that heated inlet air fuel mixture enhance combustion, peak cylinder pressure, peak cylinder temperature and change peak pressure timing

    HYDROGEN FUELLED IC ENGINE – AN OVERVIEW

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    Hydrogen as a fuel in Internal Combustion engines is a solution for the near future to realize zero CO2 emissions for traffic applications. The hydrogen fuelled IC engine is ready for that. The storage and production of hydrogen, and to build the necessary infrastructure, are the real shortcomings in the general use of hydrogen in IC engines. This paper gives an overview of the development of hydrogen fuelled IC engines by the most important car manufactures (Ford, BMW etc.). This overview indicates the evolution in the development of hydrogen fuelled engines (different generation of engines). This evolution is also made at Ghent University. Ghent University has been working for nearly 15 years on the development and optimization of hydrogen engines. Several test rigs are in function (all with electronic control management systems and sequential multi-point injection)

    A case report on methotrexate induced pancytopenia

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    Systemic lupus erythematosus (SLE) is a non-specific systemic inflammatory disease that affects various organ systems in the body leading to a wide spectrum of clinical presentations. The management of SLE includes therapy with immunosuppressant agents who have a narrow safety range and a wide adverse effect profile. Methotrexate discussed in this case report is one of such drugs whose short term and long term usage has been associated with various adverse events that affect the individuals quality of life. So, it is always advisable to take prophylactic measures and to provide patient education to detect and prevent adverse events at the earliest

    An international prospective study of INICC analyzing the incidence and risk factors for catheter-associated urinary tract infections in 235 ICUs across 8 Asian Countries

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    Background: Identify urinary catheter (UC)-associated urinary tract infections (CAUTI) incidence and risk factors (RF) in 235 ICUs in 8 Asian countries: India, Malaysia, Mongolia, Nepal, Pakistan, the Philippines, Thailand, and Vietnam. Methods: From January 1, 2014, to February 12, 2022, we conducted a prospective cohort study. To estimate CAUTI incidence, the number of UC days was the denominator, and CAUTI was the numerator. To estimate CAUTI RFs, we analyzed 11 variables using multiple logistic regression. Results: 84,920 patients hospitalized for 499,272 patient days acquired 869 CAUTIs. The pooled CAUTI rate per 1,000 UC-days was 3.08; for those using suprapubic-catheters (4.11); indwelling-catheters (2.65); trauma-ICU (10.55), neurologic-ICU (7.17), neurosurgical-ICU (5.28); in lower- middle-income countries (3.05); in upper-middle-income countries (1.71); at public-hospitals (5.98), at private-hospitals (3.09), at teaching-hospitals (2.04). The following variables were identified as CAUTI RFs: Age (adjusted odds ratio [aOR] = 1.01; 95% CI = 1.01-1.02; P < .0001); female sex (aOR = 1.39; 95% CI = 1.21-1.59; P < .0001); using suprapubic-catheter (aOR = 4.72; 95% CI = 1.69-13.21; P < .0001); length of stay before CAUTI acquisition (aOR = 1.04; 95% CI = 1.04-1.05; P < .0001); UC and device utilization-ratio (aOR = 1.07; 95% CI = 1.01-1.13; P = .02); hospitalized at trauma-ICU (aOR = 14.12; 95% CI = 4.68-42.67; P < .0001), neurologic-ICU (aOR = 14.13; 95% CI = 6.63-30.11; P < .0001), neurosurgical-ICU (aOR = 13.79; 95% CI = 6.88-27.64; P < .0001); public-facilities (aOR = 3.23; 95% CI = 2.34-4.46; P < .0001). Discussion: CAUTI rate and risk are higher for older patients, women, hospitalized at trauma-ICU, neurologic-ICU, neurosurgical-ICU, and public facilities. All of them are unlikely to change. Conclusions: It is suggested to focus on reducing the length of stay and the Urinary catheter device utilization ratio, avoiding suprapubic catheters, and implementing evidence-based CAUTI prevention recommendations

    Long-range angular correlations on the near and away side in p&#8211;Pb collisions at

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