21,167 research outputs found
A Study of Diagnostic Signatures of a Deep Groove Ball Bearing Based on a Nonlinear Dynamic Mode
No full textFor accurate fault detection and diagnosis, this paper focuses on the study of bearing vibration responses under increasing radial clearances due to investable wear and different bearing grades. A nonlinear dynamic model incorporating with local defects and clearance increments is developed for a deep groove ball bearing. The model treats the inner race-shaft and outer race-housing as two lumped masses which are coupled by a nonlinear spring formalized by the Hertzian contact deformation between the balls and races. The solution of the nonlinear equation is obtained by a Runge-Kutta method in Matlab. The results show that the vibrations at fault characteristic frequencies exhibit significant changes with increasing clearances. However, an increased vibration is found for the outer race fault whereas a decreased vibration is found for inner race fault. Therefore, it is necessary to take into account these changes in determining the size of faults
Wood, Andrew Franklyn interview
No full textOral History interview of Andrew Wood. Interview conducted by Ball Puccio, Joseph at Lockheed Martin, Sand Lake Road in Orlando, Florida
Father Andrew Mullen 1790-1818: a study in early nineteenth century spirituality
Get PDFThis thesis is laid out in three parts: Part I. The life and death of Andrew Mullen. The life is based, to a large extent, on a long letter to his mother, Catherine Mullen, dated 7 January 1810. The letter gives a definite insight into his spirituality based on his membership of the Archconfraternity of the Blessed Sacrament. There is a hint that he had a premonition of an early death. Part II. The burial of Andrew Mullen and the immediate cult to him This is based on documentary evidence. Part III. Most of this part is a catalogue of testimonies taken from 1993 onwards. Then there is the conclusion on the popular devotion to Andrew Mullen stressing the theological aspect of the subject. In the course of writing the thesis it was decided to separate the documentary evidence from the oral tradition. This was advantageous in developing the thesis, and the documents provided a secure basis for the oral tradition. Two pieces of information were found in March 1997. They are death notices: 2 January 1819, The Leinster Journal and 7 January 1819, The Car low Morning Post. There is a slight discrepancy between the two on the date of his death. Also this discrepancy shows a slight difference from the date of the tombstone
Girl seated, wearing a white dress, holding a small rugby ball [transparency] /
No full textCondition: original image not in focus.; Part of The Reverend Andrew Leslie McKay collection of photographs relating to Inland Australia, 1950-1976.; Also available in an electronic version via the internet at: http://nla.gov.au/nla.pic-vn4181136; Collection donated by Mrs Lyn McKay, widow of Reverend Les McKay, through their daughter Dr. Judith McKay
Andrew L. Harris letter dated July 11, 1863
No full textAndrew Harris wrote this letter on July 11, 1863, one week after the Battle of Gettysburg as the Union Army was trailing the retreating Confederate Army from Pennsylvania to Virginia. The letter opens by explaining the movements of the 75th Ohio Volunteer Infantry (O.V.I.) from Emmitsburg, Maryland, to Gettysburg, Pennsylvania on July 1, 1863, and the regiment's deployment with the rest of the 11th Corps into battle on the right of the First Corps. Harris notes that on the night of July 1st only 464 men out of 1200 men engaged in battle from the brigade answered roll call, with the rest killed, wounded or captured. Several of the dead from Preble County, Ohio, are listed by name. Harris describes being shelled by Confederate artillery for most of the 2nd of July and an infantry attack at night that ended with hand-to-hand fighting. The regiment spent the 3rd of July under constant shelling waiting for another Rebel attack that never came. On the 4th of July, the Second Brigade of the 11th Corps was ordered to advance into the town of Gettysburg. Andrew Harris described that this event "was the proudest moment... that ever passed over our heads- so long use to defeat We felt sure of victory for once." Harris apologizes for his poor penmanship due to a wound received earlier in the war. He then describes being wounded again at Gettysburg on July 2nd by a sharpshooter's ball that resulted in a minor wound. He closes the letter by listing the names of several soldiers that were captured and a request to have the letter published in the Eaton Register (Eaton, Ohio). Andrew L. Harris was born November 17, 1835, in Butler County, Ohio, and graduated from Miami University in 1860. In April 1861, he enlisted as a private in the 20th O.V.I. and was later commissioned as an officer in the 75th O.V.I. He saw active service in eighteen battles. At the battle of McDowell in Virginia he was seriously wounded, and his right arm permanently disabled by gunshot. He was also wounded in the fighting at Gettysburg. At Chancellorsville, he was made colonel and commander. On January 15, 1865, he was mustered out. After the Civil War, Andrew Harris served in various public offices including the Ohio Senate, lieutenant governor under William McKinley and in the McKinley presidential administration. Andrew L. Harris was Ohio's forty-fourth governor from 1906-1909. The 75th OVI (Ohio Volunteer Infantry) was organized at Camp McLean in Cincinnati and left Ohio for Grafton, Virginia (now West Virginia) on January 28, 1862. The unit saw action at the McDowell, Cross Keys, Cedar Mountain, Freeman's Ford, and Bull Run (all in Virginia) in 1862. In 1863, the 75th sustained heavy casualties at the Battles of Chancellorsville and Gettysburg. The 75th OVI moved to Morris Island, South Carolina, in 1863 and Jacksonville, Florida, in 1864. Parts of the 75th OVI were mustered out in October and November 1864 with the balance of the 75th OVI mustered out July 15, 1865
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Child with a red ball standing outside a green house with a woman, Quilpie district, Queensland, 1967? [transparency] /
No full textIdentified from slide mount of image returned to donor.; Mould spots. Colour loss across bottom.; Part of The Reverend Andrew Leslie McKay collection of photographs relating to Inland Australia, 1950-1976.; Quilpie, is a town in south west Queensland.; This house also appears in PIC/9193/572.; Also available in an electronic version via the internet at: http://nla.gov.au/nla.pic-vn4181450; Collection donated by Mrs Lyn McKay, widow of Reverend Les McKay, through their daughter Dr. Judith McKay
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Characterization of Acoustic Emissions from Mechanical Seals for Fault Detection
No full textThe application of high-frequency Acoustic Emissions (AE) for mechanical seals diagnosis is gaining acceptance as a useful complimentary tool. This paper investigates the AE characteristics of mechanical seals under different rotational speed and fluid pressure (load) for develop a more comprehensive monitoring method. A theoretical relationship between friction in asperity contact and energy of AE signals is developed in present work. This model demonstrates a clear correlation between AE Root Mean Square (RMS) value and sliding speed, contact load and number of contact asperities. To benchmark the proposed model, a mechanical seal test rig was employed for collecting AE signals under different operating conditions. Then, the collected data was processed using time domain and frequency domain analysis methods to suppressing noise interferences from mechanical system for extracting reliably the AE signals from mechanical seals. The results reveal the potential of AE technology and data analysis method applied in this work for monitoring the contact condition of mechanical seals, which will be vital for developing a comprehensive monitoring systems and supporting the optimal design and operation of mechanical seals
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