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Journal articles on the topic 'Airframes Maintenance and repair'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Kancler, David E., Christopher C. Curtis, Darryl S. Stimson, and Johnnie Jernigan. "Field Testing the AMIT Job Performance Aid: Methods, Results, and Implications for the Air Force Maintenance Community." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 51, no. 21 (October 2007): 1449–53. http://dx.doi.org/10.1177/154193120705102101.

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The Aircraft Maintenance Intuitive Troubleshooting (AMIT) project was a 3 year endeavor sponsored by the Air Force Research Laboratory's Logistics Readiness Branch. The project's goal was to develop a Job Performance Aid (JPA) that Air Force maintenance technicians could use at the aircraft, regardless of experience level, and realize improved technician performance. This paper describes the AMIT Field Demonstration Test (FDT) and subsequent Cost Analysis (CA). The FDT demonstrated that using the AMIT JPA could reduce repair times by 41 to 50 minutes. Also, performance of novice specialists using AMIT approached or exceeded that of expert specialists using current methods. The CA, applying the FDT results to fleet-wide F-16 Block 40/42 maintenance data, revealed a potential savings of over 47,000 labor hours annually in repair time, translating roughly into $3,000,000 in labor costs. Similar savings are likely across additional airframes pending development and implementation of the AMIT solution.

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2

Wang, Yiwei, Christian Gogu, Nicolas Binaud, Christian Bes, Raphael T. Haftka, and Nam-Ho Kim. "Predictive airframe maintenance strategies using model-based prognostics." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 232, no. 6 (March 1, 2018): 690–709. http://dx.doi.org/10.1177/1748006x18757084.

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Aircraft panel maintenance is typically based on scheduled inspections during which the panel damage size is compared to a repair threshold value, set to ensure a desirable reliability for the entire fleet. This policy is very conservative since it does not consider that damage size evolution can be very different on different panels, due to material variability and other factors. With the progress of sensor technology, data acquisition and storage techniques, and data processing algorithms, structural health monitoring systems are increasingly being considered by the aviation industry. Aiming at reducing the conservativeness of the current maintenance approaches, and, thus, at reducing the maintenance cost, we employ a model-based prognostics method developed in a previous work to predict the future damage growth of each aircraft panel. This allows deciding whether a given panel should be repaired considering the prediction of the future evolution of its damage, rather than its current health state. Two predictive maintenance strategies based on the developed prognostic model are proposed in this work and applied to fatigue damage propagation in fuselage panels. The parameters of the damage growth model are assumed to be unknown and the information on damage evolution is provided by noisy structural health monitoring measurements. We propose a numerical case study where the maintenance process of an entire fleet of aircraft is simulated, considering the variability of damage model parameters among the panel population as well as the uncertainty of pressure differential during the damage propagation process. The proposed predictive maintenance strategies are compared to other maintenance strategies using a cost model. The results show that the proposed predictive maintenance strategies significantly reduce the unnecessary repair interventions, and, thus, they lead to major cost savings.

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3

Riyanti, Lilies Esthi, Wira Gauthama, Mursyidin Mursyidin, Bhima Sakti Arrafat, and Andri Kurniawan. "PENGENALAN SHEET METAL REPAIR UNTUK GURU BIDANG STUDI PRODUKTIF SMK PENERBANGAN." Darmabakti: Jurnal Inovasi Pengabdian dalam Penerbangan 3, no. 1 (December 31, 2022): 123–30. http://dx.doi.org/10.52989/darmabakti.v3i1.67.

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Kartika Aqasa Bhakti Flight Vocational School is located at Jalan Jembawan Raya No. 20 A Semarang, this Vocational School is the only school in the city of Semarang with a concentration in aviation majors, namely Airframe and Powerplant and Aircraft Electrical. In its development, the school management has always carried out efforts to improve the competence of maintenance teachers in the Airframe Powerplant major through training, visits, and other forms, but other forms of additional programs are still needed. The purpose of this community service activity is to provide training in carrying out repairs to sheet metal under airframe manufacturing standards as well as competence in the field of airframe maintenance required. The implementation of the community service chosen is a form of training, both theory and practice for competency in repairing sheet metal in aircraft. Implementation of online training through zoom and hands-on practice. Implementing sheet metal repair introduction training for teachers, it can increase the competence of teachers who have an undergraduate education background so that it helps in the teaching and learning process at the Kartika Aqasa Bhakti Aviation Vocational School Kegiatan pelatihan ini dilatarbelakangi oleh masih rendahnya jumlah dan kompetensi guru bidang produktif sekolah menengah kejuruan, khususnya bidang produktif SMK penerbangan. Data pemerintah tahun 2019 memperlihatkan mayoritas postur tenaga pengajarnya masih didominasi oleh kategori bidang normatif adaptif atau guru umum, sedangkan guru produktif yang mengajar materi pelajaran sesuai bidang keahliannya masih rendah, berada pada prosentase di bawah 35 %. SMK Penerbangan Kartika Aqasa Bhakti berlokasi di Jalan Jembawan Raya No. 20 A Semarang, SMK ini adalah satu- satunya sekolah yang ada di Kota Semarang dengan konsentrasi jurusan bidang penerbangan, yaitu Airframe dan Powerplant serta Kelistrikan Pesawat Udara. Dalam perkembangannya, manajemen sekolah selalu melaksanakan upaya – upaya untuk meningkatkan kompetensi keahlian guru bidang maintenance pada jurusan Airframe Powerplant melalui pelatihan – pelatihan, kunjungan dan bentuk lain tetapi masih diperlukan bentuk program tambahan lain. Kegiatan pengabdian kepada masyarakat dalam bentuk pelatihan ini bertujuan untuk memberikan kompetensi dalam melakukan repair pada sheet metal sesuai dengan standar manufacture airframe. Metode pelaksanaan kegiatan pengabdian masyarakt ini melalui pelahitan on site baik teori maupun praktek hands on. Hasil dari kegiatan pengabdian kepada masyarakat dalam bentuk pelatihan dasar sheet metal repair adalah para guru-guru bidang produuktif memiliki kompetensi dalam melaksanakan sheet metal repair sehingga meningkatkan kualitas pembelajaran siswa bidang airframe.

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4

Fedotov, A. A., A. V. Tsipenko, and A. I. Lebedev. "NUMERICAL MODELLING OF THE AIRFRAME DAMAGE GROWTH FOR THE ADHESIVE REPAIR JOINT CALCULATION." Civil Aviation High TECHNOLOGIES 21, no. 3 (July 3, 2018): 125–38. http://dx.doi.org/10.26467/2079-0619-2018-21-3-125-138.

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In the context of the predicted growth in air transportation, the additional attention will be paid to the organization of the competitive maintenance and repair operations for the commercial airplanes. The implementation of new technological processes for airframe repairs and the application of modern information technologies during the development of the repair procedures can be a significant advantage in the expanding market of post-production support of the commercial air fleet. Airframe adhesive repairs allow using lifting abilities of the materials more intensively, but application of the adhesive joints technology requires more complicated strength calculation procedure. It is advisable to utilize the modern finite element software packages to perform the reliable calculation. The capabilities of these software packages allow obtaining adequate computational results for adhesive repair joint parameters subjected to cyclic loads. This paper is concentrated on application of the finite element methods to simulate the crack growth in isotropic material and on methods for accelerated calculation of the mechanical response of cracked structures. Crack growth simulation is performed based on XFEM methods where the created finite element model is complemented with asymptotic imitation function of crack tip and with discontinuous jump function across the crack surfaces. Fatigue properties of the repair joint are modelled in accordance with direct cyclic approach, where a Fourier series approximation with time integration of the nonlinear material behavior is applied. After that, the result of integration at each point of the load history is used for the prediction of the material fatigue properties degradation at the next step of computation; this allows us to evaluate the material damage growth rate. Based on calculation results, a conclusion was made that the received numerical data match the full-scale test results; the time spent for calculation with the usage of accelerated computational methods was evaluated.

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5

Nascimento, Marcelino P., Carolina C. Batista, Bruno A. Sorrija, and Herman J. C. Voorwald. "Fatigue Crack Growth Investigation on a Maintenance Welding Repair Applied on a High Responsibility Airframe." Procedia Materials Science 3 (2014): 744–49. http://dx.doi.org/10.1016/j.mspro.2014.06.122.

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6

Hrúz, Michal, Martin Bugaj, Andrej Novák, Branislav Kandera, and Benedikt Badánik. "The Use of UAV with Infrared Camera and RFID for Airframe Condition Monitoring." Applied Sciences 11, no. 9 (April 21, 2021): 3737. http://dx.doi.org/10.3390/app11093737.

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The new progressive smart technologies announced in the fourth industrial revolution in aviation—Aviation 4.0—represent new possibilities and big challenges in aircraft maintenance processes. The main benefit of these technologies is the possibility to monitor, transfer, store, and analyze huge datasets. Based on analysis outputs, there is a possibility to improve current preventive maintenance processes and implement predictive maintenance processes. These solutions lower the downtime, save manpower, and extend the components’ lifetime; thus, the maximum effectivity and safety is achieved. The article deals with the possible implementation of an unmanned aerial vehicle (UAV) with an infrared camera and Radio Frequency Identification (RFID) as two of the smart hangar technologies for airframe condition monitoring. The presented implementations of smart technologies follow up the specific results of a case study focused on trainer aircraft failure monitoring and its impact on maintenance strategy changes. The case study failure indexes show the critical parts of aircraft that are subjected to damage the most. The aim of the article was to justify the need for thorough monitoring of critical parts of the aircraft and then analyze and propose a more effective and the most suitable form of technical condition monitoring of aircraft critical parts. The article describes the whole process of visual inspection performed by an unmanned aerial vehicle (UAV) with an IR camera and its related processes; in addition, it covers the possible usage of RFID tags as a labeling tool supporting the visual inspection. The implementations criteria apply to the repair and overhaul small aircraft maintenance organization, and later, it can also increase operational efficiency. The final suggestions describe the possible usage of proposed solutions, their main benefits, and also the limitations of their implementations in maintenance of trainer aircraft.

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7

Zhang, You Hong, and Bo Yang. "The Economical Life of Titanium Alloy Fasten Holes Structure." Advanced Materials Research 108-111 (May 2010): 324–27. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.324.

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This paper outlined the experimental and theoretical study on the TC4 alloy fasten holes structure to assess the first inspection and maintenance period for structures. The initial fatigue quality of the fastener holes was represented by an equivalent initial flaw size distribution. Based on the experimental results of crack size, the life of fasten structure detail in which 5% crack happened was provided and the resulted life was suggested as the structure economical life. The predicated economical life of titanium alloy fasten hole structure are helpful to the economical repair of the airframe structure.

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8

Cajani,, Maurizio. "AGEING AIRFRAMES AND CORROSION MAINTENANCE." Corrosion Reviews 25, no. 3-4 (August 2007): 263–74. http://dx.doi.org/10.1515/corrrev.2007.25.3-4.263.

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9

Eduardo Salamanca, H., and L. Luis Quiroz. "A simple method of estimating the maintenance cost of airframes." Aircraft Engineering and Aerospace Technology 77, no. 2 (April 2005): 148–51. http://dx.doi.org/10.1108/00022660510585983.

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10

Kustroń, Kamila. "SHM Supporting Damage Tolerance Design Philosophy As a Challenge for Designers of Future Airframes." Journal of Konbin 6, no. 3 (January 1, 2008): 213–20. http://dx.doi.org/10.2478/v10040-008-0068-9.

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SHM Supporting Damage Tolerance Design Philosophy As a Challenge for Designers of Future AirframesDevelopment design pfilosophy of airframes in all the relevant technological fields is important for the evaluation of high performance airframes best to achive high level of safety and satisfy the market needs. Maintenance cost reduction, increased aircraft availability and weight saving are goals which will be reaching by SHM systems as on-line monitoring of the structure health. Irrespective of which materials will be used in the future, the current design philosophy, which is applied today by the structural designers, will be challenged by the new design philosophy based on SHM. The most efective SHM methods are based on Lamb wave techniques. Using the based on Lamb wave techniques would be cost-effective and reliable damage detection is critical for the utilization of metal, composite and hybrid materials. Multitude of diagnostics data requires to use expert systems for effective analysis.

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11

Buckingham, Rob. "Snake arm robots." Industrial Robot: An International Journal 29, no. 3 (June 1, 2002): 242–45. http://dx.doi.org/10.1108/01439910210425531.

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Bringing a new robot to market is an exciting venture. When that robot is a new type of robot the venture takes on new proportions – it becomes an adventure. Dr Rob Buckingham, managing director of OCRobotics Ltd, describes the principles of a new snake arm robot that has applications in a number of industries including aerospace (engines and airframes), nuclear, space and surgery as well as a whole range of general inspection and maintenance tasks.

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12

Black, George. "Instrument Maintenance and Repair." BioScience 36, no. 2 (February 1986): 66. http://dx.doi.org/10.2307/1310102.

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13

Vinck, Dominique. "Maintenance and Repair Work." Engineering Studies 11, no. 2 (May 4, 2019): 153–67. http://dx.doi.org/10.1080/19378629.2019.1655566.

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14

WANG, HONGZHOU, and HOANG PHAM. "OPTIMAL AGE-DEPENDENT PREVENTIVE MAINTENANCE POLICIES WITH IMPERFECT MAINTENANCE." International Journal of Reliability, Quality and Safety Engineering 03, no. 02 (June 1996): 119–35. http://dx.doi.org/10.1142/s0218539396000090.

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This paper proposes three age-dependent preventive maintenance models with imperfect repair and/or imperfect preventive maintenance (pm). In these models imperfect repair is treated in a way that after repair the lifetime of a unit will decrease to a fraction of its immediately previous one and its repair time will increase to a multiple of immediately previous one. In this paper, the expected maintenance cost rate and asymptotic average availability are derived with a consideration that the maintenance and repair times are not negligible. The optimum maintenance policies are then determined for the three imperfect maintenance models respectively. A class of related optimization problems is also discussed. Finally, a numerical example is presented to illustrate the results.

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15

Dai, Liangtie, and Yujie Wu. "Trust Maintenance and Trust Repair." Psychology 06, no. 06 (2015): 767–72. http://dx.doi.org/10.4236/psych.2015.66075.

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16

Sim, S. H., and J. Endrenyi. "Optimal preventive maintenance with repair." IEEE Transactions on Reliability 37, no. 1 (April 1988): 92–96. http://dx.doi.org/10.1109/24.3721.

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17

Biehl, Markus, Edmund Prater, and John R. McIntyre. "Remote repair, diagnostics, and maintenance." Communications of the ACM 47, no. 11 (November 2004): 100–106. http://dx.doi.org/10.1145/1029496.1029501.

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18

Kovalev, L. I., and I. L. Kovalev. "ANALYSIS SYSTEMS MAINTENANCE AND REPAIR LIVESTOCK." Russian Journal of Agricultural and Socio-Economic Sciences 42, no. 6 (June 28, 2015): 13–21. http://dx.doi.org/10.18551/rjoas.2015-06.02.

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19

Barco, A. L. "Budgeting for Facility Repair and Maintenance." Journal of Management in Engineering 10, no. 4 (July 1994): 28–34. http://dx.doi.org/10.1061/(asce)9742-597x(1994)10:4(28).

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20

Esposito, V., and S. Nocchia. "Maintenance and repair of rolling stock*." Welding International 22, no. 9 (September 2008): 627–34. http://dx.doi.org/10.1080/09507110802413274.

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21

Hammett, Michael. "The repair and maintenance of brickwork." Structural Survey 9, no. 2 (February 1991): 153–60. http://dx.doi.org/10.1108/eum0000000003248.

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22

Li, Haijun, and Moshe Shaked. "Imperfect repair models with preventive maintenance." Journal of Applied Probability 40, no. 4 (September 2003): 1043–59. http://dx.doi.org/10.1239/jap/1067436099.

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Brown and Proschan (1983) introduced the imperfect repair model, in which an item, upon failure, is replaced with a new one with probability α, and is minimally repaired with probability 1 − α. In this paper we equip the imperfect repair model with preventive maintenance, and we obtain stochastic maintenance comparisons for the numbers of failures under different policies via a point-process approach. We also obtain some results involving stochastic monotonicity properties of these models with respect to the unplanned complete repair probability α.

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23

Eliasson, Pernilla, Therese Andersson, Jana Kulas, Petra Seemann, and Per Aspenberg. "Myostatin in tendon maintenance and repair." Growth Factors 27, no. 4 (January 2009): 247–54. http://dx.doi.org/10.1080/08977190903052539.

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24

Milton, B. "REPAIR AND MAINTENANCE OF FLAT ROOFS." Property Management 6, no. 1 (January 1988): 40–46. http://dx.doi.org/10.1108/eb006682.

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25

Li, Haijun, and Moshe Shaked. "Imperfect repair models with preventive maintenance." Journal of Applied Probability 40, no. 04 (December 2003): 1043–59. http://dx.doi.org/10.1017/s0021900200020283.

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Brown and Proschan (1983) introduced the imperfect repair model, in which an item, upon failure, is replaced with a new one with probability α, and is minimally repaired with probability 1 − α. In this paper we equip the imperfect repair model with preventive maintenance, and we obtain stochastic maintenance comparisons for the numbers of failures under different policies via a point-process approach. We also obtain some results involving stochastic monotonicity properties of these models with respect to the unplanned complete repair probability α.

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26

Gregson, Nicky, Alan Metcalfe, and Louise Crewe. "Practices of Object Maintenance and Repair." Journal of Consumer Culture 9, no. 2 (June 15, 2009): 248–72. http://dx.doi.org/10.1177/1469540509104376.

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27

Kelly, Maree. "Women's Home Maintenance and Repair Course." Urban Policy and Research 11, no. 2 (June 1993): 102. http://dx.doi.org/10.1080/08111149308551558.

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28

Taetzsch, Thomas, and Gregorio Valdez. "NMJ maintenance and repair in aging." Current Opinion in Physiology 4 (August 2018): 57–64. http://dx.doi.org/10.1016/j.cophys.2018.05.007.

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29

Logan, Mary, Carol Davis-Smith, and Alan Gresch. "Maintenance and repair of anesthesia machines." AORN Journal 93, no. 2 (February 2011): 195. http://dx.doi.org/10.1016/j.aorn.2010.12.008.

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30

Mi, Jie. "Burn-in and Maintenance Policies." Advances in Applied Probability 26, no. 1 (March 1994): 207–21. http://dx.doi.org/10.2307/1427587.

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Burn-in is a widely used method to improve quality of products after they have been produced. For a repairable component there are two common types of repair, complete repair and minimal repair. Preventive maintenance policies such as age replacement and block replacement are often employed in field operation. The present paper takes burn-in, maintenance and repair into consideration at the same time and considers related cost structures. The properties of the corresponding optimal burn-in times and optimal maintenance policies are discussed.

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31

Mi, Jie. "Burn-in and Maintenance Policies." Advances in Applied Probability 26, no. 01 (March 1994): 207–21. http://dx.doi.org/10.1017/s0001867800026082.

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Burn-in is a widely used method to improve quality of products after they have been produced. For a repairable component there are two common types of repair, complete repair and minimal repair. Preventive maintenance policies such as age replacement and block replacement are often employed in field operation. The present paper takes burn-in, maintenance and repair into consideration at the same time and considers related cost structures. The properties of the corresponding optimal burn-in times and optimal maintenance policies are discussed.

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32

SEMYKINA, A. S., and N. A. ZAGORODNIY. "IMPROVEMENTOFTHESYSTEMOF MAINTENANCE AND REPAIR OF QUARRY MOTOR TRANSPORT." World of transport and technological machines 78, no. 3-4 (2022): 35–41. http://dx.doi.org/10.33979/2073-7432-2022-4(78)-3-35-41.

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To improve the system of maintenance and repair, the criterion of rationality of the system of maintenance and repair of engines of mining vehicles is determined, taking into account the costs of maintenance and repair, as well as the type of repair enterprise and the operating time of engine parts. By reducing the cost of maintenance and repair and increasing the engine resource, the efficiency of a rational maintenance and repair system is achieved.

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33

Xu, Ken An. "Fault Analysis and Repair Computer Motherboard Interface." Applied Mechanics and Materials 687-691 (November 2014): 3415–18. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3415.

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This paper mainly presents the common malfunction analysis and maintenance of computer motherboard interface. First introduced the mainboard interface simple maintenance of the basic knowledge, and then analyzed the frequent failures of maintenance. In the end, enumerates the maintenance examples to further understand maintenance knowledge.

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34

Kirmani, S. N. U. A., and Ramesh C. Gupta. "On Repair Age Residual Repair Life in the Minimal Repair Process." Probability in the Engineering and Informational Sciences 3, no. 3 (July 1989): 381–91. http://dx.doi.org/10.1017/s0269964800001248.

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Some properties of repair age (the elapsed time since the last repair) and the residual repair life (the time until the next repair) are studied for the minimal repair process under various assumptions on the aging characteristics of the equipment under maintenance. Bounds on expected repair age and expected residual repair life are obtained. Some characterizations of the Poisson process are also proved.

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35

Block, Henry W., Naftali A. Langberg, and Thomas H. Savits. "Maintenance comparisons: block policies." Journal of Applied Probability 27, no. 3 (September 1990): 649–57. http://dx.doi.org/10.2307/3214548.

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Complete repair and minimal repair models with a block maintenance policy are considered. Each of these models gives rise to a counting process, and these processes are compared stochastically. This contrasts with most previous work on maintenance policies where only univariate marginal comparisons were made. Also a more general block schedule is considered than is customary.

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36

Block, Henry W., Naftali A. Langberg, and Thomas H. Savits. "Maintenance comparisons: block policies." Journal of Applied Probability 27, no. 03 (September 1990): 649–57. http://dx.doi.org/10.1017/s0021900200039188.

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Complete repair and minimal repair models with a block maintenance policy are considered. Each of these models gives rise to a counting process, and these processes are compared stochastically. This contrasts with most previous work on maintenance policies where only univariate marginal comparisons were made. Also a more general block schedule is considered than is customary.

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37

BANNIKOV, Dmitry, Nina SIRINA, and Alexander SMOLYANINOV. "MODEL OF THE MAINTENANCE AND REPAIR SYSTEM IN SERVICE MAINTENANCE MANAGEMENT." Transport Problems 13, no. 3 (2018): 5–14. http://dx.doi.org/10.20858/tp.2018.13.3.1.

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38

Shankar, Gauri, and Vandana Sahani. "Reliability analysis of a maintenance network with repair and preventive maintenance." International Journal of Quality & Reliability Management 20, no. 2 (March 2003): 268–80. http://dx.doi.org/10.1108/02656710210429627.

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39

Godik, Eduard. "Health Care: Maintenance or Repair?: Preventive Maintenance Approach to Health Care." IEEE Pulse 4, no. 2 (March 2013): 38–39. http://dx.doi.org/10.1109/mpul.2013.2242015.

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40

Kayan, Brit Anak. "Green maintenance for heritage buildings: paint repair appraisal." International Journal of Building Pathology and Adaptation 35, no. 1 (April 10, 2017): 63–89. http://dx.doi.org/10.1108/ijbpa-05-2016-0011.

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Purpose Sustainability encapsulates economic, environmental and societal domains. In order to conform to these domains, the efficiency of maintenance and repair of heritage buildings is no exception. Emergently, environmental considerations for sustainable heritage buildings repair have become increasingly important. The purpose of this paper is to present a decision-making process based on “Green Maintenance Model” – an appraisal approach based on life cycle assessment (LCA) of paint repair options for heritage buildings. Design/methodology/approach Calculation procedures of Green Maintenance model within selected boundaries of LCA enable evaluation of carbon emissions, in terms of embodied carbon expenditure, expended from paint repair for heritage buildings during maintenance phase. Findings “Green Maintenance” model could be understood as a carbon LCA of paint repair and has been recognized in reducing carbon emissions. Significantly, the model underpins decision-making for repair options for heritage buildings. Practical implications It must be emphasized that the calculation procedures of Green Maintenance model is not limited to heritage buildings and can be applied to any repair types, materials used and building forms. More importantly, this model practically supports environmentally focused conservation and promotes sustainable repair approach. Social implications The implementation of Green Maintenance model highlights the efficiency of repairs options that may be adopted. Originality/value Green Maintenance shows that generated environmental maintenance impact from repair options relays the “true” embodied carbon expenditure contextualized within the longevity of repair and its embodied carbon. This will consequently allow rationale in appraisal of repair options.

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41

Kim, Dong-Young, and Won-Jik Yang. "Analysis of Repair Standards for Efficiency of School Facilities Centered on Seoul Metropolitan Office of Education." Journal of the Korean Society of Hazard Mitigation 22, no. 6 (December 31, 2022): 1–10. http://dx.doi.org/10.9798/kosham.2022.22.6.1.

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Recently, the Act on the Safety and Maintenance of Educational Facilities, which imposes the establishment of an integrated information network for educational facilities, was implemented in Korea. With the operation of this network becoming mandatory, a legal system was established to manage information on the safety and maintenance of educational facilities systematically. This study aims to prepare an efficient maintenance plan by analyzing data on the maintenance history of educational facilities. The durability of each repair work is calculated by analyzing its repair cycle, and a systematic repair plan to restore and maintain the performance of a school facility in a timely manner by integrating its maintenance cycle is established. Introducing repair work, which is partial maintenance, into full maintenance is appropriate from the life-cycle perspective. A budget reduction analysis is conducted to verify the efficiency of the repair work. If a repair work is performed by type at the repair rate of 12%–20%, a budget of 6 billion won (approximately 10% total repair cost) can be reduced. Therefore, introducing the level of repair work (cycle and repair rate) for each type of construction is necessary.

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42

Rikunov, Oleg, and Viktor Kuzhelovych. "EVALUATION OF THE EFFICIENCY OF USING A MIXED SYSTEM OF MAINTENANCE AND REPAIR OF ROAD VEHICLES OF ROAD TRANSPORT." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 1 (December 28, 2022): 74–78. http://dx.doi.org/10.20998/2079-0775.2022.1.07.

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The article argues the relevance of determining the efficiency of the mixed system of maintenance and repair of road vehicles. Improving the system of maintenance and repair of road transport is one of the main ways to increase the efficiency of motor transport enterprises. This is due to the high growth rate of work performed, the significant complexity of the design of modern vehicles and the variety of implementation of new maintenance strategies and diagnostic methods. Significant complications in the design of components and units of modern road vehicles, increasing their functions, more busy modes of operation of components, units, etc. - significantly exacerbated the problem of traffic safety, which is largely due to the quality of maintenance and repair. The urgent need to improve the system of maintenance and repair is due to changes in the technical condition of automotive equipment and the requirements for maintaining the working condition of vehicles during operation. An analysis of existing maintenance and repair strategies has shown that each has its advantages and disadvantages. The combination of advantages of each strategy and elimination of shortcomings will lead to the creation of a mixed system of maintenance and repair, which along with high-quality staffing of repair companies and equipping them with modern diagnostic equipment will increase the readiness of road vehicles, technical efficiency and efficiency quality of operation, reduce maintenance and repair costs at a given level of reliability. © О. М. Рікунов, В. І. Кужелович, 2022 Keywords: road transport vehicles, maintenance and repair system, preventive maintenance system, average total duration of maintenance and repair, technical readiness coefficient, technical utilization coefficient, economic feasibility

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Özdemir, A. T., and L. Edwards. "Measurement of the three-dimensional residual stress distribution around split-sleeve cold-expanded holes." Journal of Strain Analysis for Engineering Design 31, no. 6 (November 1, 1996): 413–21. http://dx.doi.org/10.1243/03093247v316413.

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Cold expansion of fastener holes is an increasingly common way of improving the fatigue endurance of airframes. Although a number of methods of cold expansion are possible, the split-sleeve cold-expansion process is the most widely accepted and is widely used in the repair and manufacture stages of both military and civil aircraft. In the present work, the residual stress distribution around split-sleeve cold-expanded holes has been measured as a function of both position through the plate thickness and around the hole through novel use of the Sachs method. It is found that the residual hoop stresses being generated at the mid-thickness of the plate at orientation 90° from the position of the split in the expansion sleeve. It is suggested that this variation must be taken into account both in the implementation of the technology and in any potential model used for the prediction of fatigue life of cold-expanded holes.

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Qiu, Xiao Hua, and Chao Zu Ma. "Virtual Maintenance Technology Application Research in Agricultural Vehicle Repair." Applied Mechanics and Materials 490-491 (January 2014): 484–89. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.484.

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This paper introduces the virtual maintenance technology, expounds the present situation of agricultural vehicle maintenance and the necessity of virtual maintenance application in vehicle maintenance, and discusses the application of virtual maintenance technology in agriculture vehicle maintenance. Finally the suggestions used on virtual agricultural vehicle maintenance in the future are put forward.

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Woźny, Piotr, and Józef Błachnio. "Quality Requirements Regarding Aircraft Maintenance and Repair Services." Research Works of Air Force Institute of Technology 35, no. 1 (December 1, 2014): 53–66. http://dx.doi.org/10.1515/afit-2015-0004.

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Abstract During operation, aircraft (AC) are subject to use, maintenance, repair and disposal. Each of those processes requires adequate quality. This study presents requirements related to quality management with which an AC maintenance and repair sub-system ought to comply. Documents containing requirements pertaining to both management and technical aspects have been analysed. Applicable standards and regulations affecting the AC repair process quality assurance have been presented. A description of standards observance of which is required to ensure effective operation of modern AC maintenance and repair subsystems significantly affecting maintenance of the AC required airworthiness has been included. Complexity of the decision-taking process pertaining to AC maintenance and repair within the airworthiness maintenance sub-system has been presented

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Funk, Paul A., and Robert G. Hardin IV. "COTTON GINNERS HANDBOOK: A Comprehensive Gin Maintenance Program." Journal of Cotton Science 23, no. 1 (2019): 78–89. http://dx.doi.org/10.56454/xqui5895.

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A comprehensive gin maintenance program is critical to optimizing the efficiency of a ginning system and affects labor, energy, and maintenance costs; safety, downtime, daily throughput, fiber properties, and customer satisfaction. A comprehensive gin maintenance program includes a sound maintenance philosophy, downtime and repair documentation and guidelines, a dormant season repair program, ginning season preventive maintenance, and a ginning season repair program. Implementing a comprehensive gin maintenance program in dormant and ginning seasons will minimize the frequency and length of downtime. This will maximize throughput, reducing energy and labor costs per bale, benefitting both the gin’s customers and its owners. Example downtime, inspection, repair and preventive maintenance reports are provided.

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Tian, Feng, Peng Sun, and Izak Duenyas. "Optimal Contract for Machine Repair and Maintenance." Operations Research 69, no. 3 (May 2021): 916–49. http://dx.doi.org/10.1287/opre.2020.2018.

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Maintenance outsourcing is quite common in industries that rely on complex and critical equipment. Instead of investing in the maintenance facilities, firms outsource maintenance activities to specialized companies. However, it may be hard for firms (i.e., principal) to observe whether maintenance companies (i.e., agent) put sufficient resources into providing the best service, which gives rise to agency issues. In a dynamic environment in which an agent is responsible for both maintenance and repair of a critical machine, how the principal uses payments and termination to tackle agency issues is a challenging problem. In “Optimal Contract for Machine Repair and Maintenance,” F. Tian, P. Sun, and I. Duenyas provide theoretical guidance on designing the optimal contract to induce efforts from an agent to efficiently operate a machine. Although they consider the very general contract forms, the optimal contracts demonstrate simple and intuitive structures, making them easy to describe and implement in practice.

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Savor, Zlatko, Gordana Hrelja, and Jure Radic. "The maintenance and repair of Dubrovnik bridge." IABSE Symposium Report 91, no. 2 (January 1, 2006): 117–24. http://dx.doi.org/10.2749/222137806796236240.

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Tsekrekou, Maria, Kalliopi Stratigi, and Georgia Chatzinikolaou. "The Nucleolus: In Genome Maintenance and Repair." International Journal of Molecular Sciences 18, no. 7 (July 1, 2017): 1411. http://dx.doi.org/10.3390/ijms18071411.

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Shore, T. "Inspection, maintenance and repair of Ex apparatus." Power Engineering Journal 14, no. 5 (October 1, 2000): 224–28. http://dx.doi.org/10.1049/pe:20000504.

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