Academic literature on the topic 'High RPM Capability'
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Journal articles on the topic "High RPM Capability"
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Heshmat, H. "Advancements in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capability." Journal of Tribology 116, no. 2 (1994): 287–94. http://dx.doi.org/10.1115/1.2927211.
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An advanced-design, aerodynamic, air-lubricated foil journal bearing achieved a landmark speed of 2200 cps (132,000 rpm) and a major breakthrough in load performance of 673.5 kPa (97.7 psi). At 20°C (68°F) room temperature, normal ambient pressure, 995 cps (59,700 rpm) rotor speed, and with bearing projected pad area of 1081 mm2 (1.675 in2), the bearing demonstrated a load capacity of 727.8 N (163.6 lb). The bearing also exhibited low heat generation, with about 40°C (104°F) average side leakage temperature rise. For this demonstration, a highspeed spindle utilizing a pair of 35-mm (1.375-in.) bearings and supporting a test rotor with a mass of 1.545 kg (weighing 3.41 lb) and overall length of 211 mm (8.3 in.) was successfully taken to the limiting speed of the test apparatus. This speed was set by the maximum sound velocity (Mach 1) in the spindle’s turbine wheel. The rotor/bearing speed of 4.62 × 106 DN is beyond the capability of any advanced oil-lubricated ball bearings or conventional gas-lubricated bearings. The net result is a highly stable bearing at high operating speed. This paper presents the development of this air-lubricated foil journal bearing, the operational procedures used during testing, test results (dynamic analyses), and load performance characteristics.
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Septriani, Shafira, Norman Arie Prayogo, Asrul Sahri, and Christopher L. Brown. "Efficiency of suspended solid removal from tofu production using Rotating Biological Contractor (RBC)." E3S Web of Conferences 322 (2021): 01034. http://dx.doi.org/10.1051/e3sconf/202132201034.
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Tofu is a common food in Indonesia, made from soybean, and needs gigantic water for the process. The liquid waste of the tofu industry is usually directly discharged into the river without being processed. Liquid wastes of tofu have high organic content and become a problem in water pollution. Rotating Biological Contactor (RBC) is efficient method to treat waste with a high organic matter load by utilizing microorganisms to consume organic matter through biofilms. Biofilm will degrade organic matter aerobically. The purpose of the study is to determine the capability of RBC to reduce the organic content of tofu wastewater with different rotations of the disk. Rotation was experimentally varied from 30, 40, 50, 60 RPM and control. Results were considered in percentage decrease from the untreated waste: TSS of 87.56 ± 6.48%, BOD of 99.13 ± 0.21 %, and COD of 98.53 ± 0.08%. To conclude, the optimum rotation is 50 RPM for decreasing BOD and COD, otherwise 40 RPM for reducing TSS. The results effluent RBC on three parameters passed the quality standards legally for the soybean processing company or activity.
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Sun, Fei, Hong Ji, Shengqing Yang, and Chen Li. "Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design." Fluids 8, no. 6 (2023): 178. http://dx.doi.org/10.3390/fluids8060178.
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Raising the working speed of hydraulic pumps to maximize the efficient matching range of electric motors is one of the possible ways to achieve energy efficiency in electric machinery. By means of a simulation method verified with subsequent experiments in terms of filling efficiency, this paper first analyzed the suction capacity of crescent-type internal gear pumps with different geometric parameters at high speed, and the gear pair that is more suitable for high-speed operation was obtained. Subsequently, as the more significant contributions, two pairing solutions of a non-positive displacement pump and an internal gear pump were proposed to pressurize the inlet of the gear pump to keep it from cavitating. In the compact design solution, the inclined-holes type and axial-flow blade pumps share the same speed as the hydraulic pump, while the decentralized layout solution allows for flexible adjustment of the centrifugal impeller-type pump speed to maximize the filling capability. The final simulation results show that, with the help of inclined-holes type and centrifugal impeller type pumps, the filling efficiency of the internal gear pump at 6000 rpm can be improved by 3.59% and 5.84%, respectively, while the axial-flow blades pump fails to eliminate cavitation regardless of speed. Moreover, when the hydraulic pump works at 6000 rpm, the centrifugal impeller speed needs to be set above 2500 rpm to make sense.
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Woro Fittrin Selo Nur Giyatno, Dhanis, Tommy Richard Orlando, and Nining Supriatin. "Analog tachometer as an indicator motorcycle machine wearing based on moving coil." E3S Web of Conferences 43 (2018): 01004. http://dx.doi.org/10.1051/e3sconf/20184301004.
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As an increasing highly mobility and high traffic, the necessary of motorcycle is highly increasing. The condition makes user ride motorcycle with highly speed in highly frequency. Then, these conditions make motorcycle machine reliability is highly decreasing. Finally, it made machine is run to damage and maintenance cost to be high. Analog tachometer is an electronic instrumentation that proposed to solve these problems. Actually, instrumentation system of tachometer is an electromechanical system. A wire in a control unit is embedded into shaft of crank. Then, magnet in control unit will convert rotary machine energy into electrical energy with d’Arsonval meter. Current sensor and small variable resistor are the kind of sensor that are used in tachometer. Small variable resistor is used for tuning and recalibration. Utilization small variable resistor in tachometer circuit is make calibration and recalibration current sensing of electrical current that rectified by diode. Tachometer for counting rotation per minute (RPM) motorcycle machine is built up. The tachometer has capability to count RPM motorcycle machine 1,000 – 13.000 RPM. The range is reliable as an indicator for user to minimize motorcycle machine wearing.
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Wardani, Citra Sari, Dwi Anung Nindito, and Allan Restu Jaya. "Inovasi Dan Desain Turbin Hidrokinetik Darrieus Berdasarkan Bentuk Distribusi Kecepatan Aliran." Media Ilmiah Teknik Sipil 9, no. 1 (2020): 32–43. http://dx.doi.org/10.33084/mits.v9i1.1771.
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Darrieus turbine use blades with a hydrofoil shape, so the rotational ability is influenced by lift force. This caused the initial rotation capability to be very low when compared to the drag turbine type. The flow velocity distribution in the vertical direction indicates a small cross-sectional speed of flow approaching the base of the flow channel, then rising towards the surface. Darrieus Spinning Top turbine is the result of innovation and design based on the concept of flow velocity distribution. Darrieus Spinning Top turbine’s blade shapes are circular-arc and straight-line, adjusting flow velocity distribution of 0.2H, 0.6H and 0.8H from the top of the turbine. In this study, a performance comparison was conducted between Darrieus turbine and Spinning Top Darrieus. Darrieus turbines produce RPM and torque values of 54.59 – 67.90 and 0.014 – 0.029 Nm, respectively. Darrieus Spinning Top turbines produce RPM values and torque of 69.24 – 82.02 and 0.012 – 0.020 Nm respectively. RPM improvements in Darrieus Spinning Top turbine design increase the influence of lift force (increased λ value). This results in a high lap rate, but requires a high self starting to perform the turbine rotation cycle.
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Hosseinkhani, Hossein. "Viral/Non-Viral Vectors in DNA/RNA Delivery Technology." Recent Progress in Materials 06, no. 04 (2024): 1–45. https://doi.org/10.21926/rpm.2404027.
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Viral and non-viral vectors for nucleic acids (DNA/RNA) therapeutics are important in development of pharmaceutical industries. Although viral vectors have shown significant impact in transfection of DNA/RNA, but numerus studies have shown that non-viral vectors are also effective for the safe and targeted delivery of DNA/RNA to exact location in the body with high percentage of efficacy, safety, and low-immunogenicity. It is also important to protect the nucleic acids from degradation and large-scale production capability at low cost. This review article discusses the potential applications of viral vectors in DNA/RNA delivery technology, while some of the applications of non-viral vectors are compared with viral vectors.
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El-Sousy, Sara M., Saadia M. Easa, Amira A. Hassan, and Abdel-Mohsen S. Ismail. "Production of a bacterial extracellular L-glutaminase possessing high antioxidant capability." Egyptian Pharmaceutical Journal 20, no. 1 (2021): 59–71. http://dx.doi.org/10.4103/epj.epj_51_20.
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Background and objectives L-glutaminase has utmost practical importance in many fields, such as medicine, pharmacy, and some industries as an effective antioxidant, anticancer, flavor enhancer, and used as an analytical reagent in the determination of glutamate and glutamine. The objective of the present article was to formulate the production medium and to pinpoint the proper growth conditions for the most potent microorganism producing highly active glutaminase enzyme. The general properties of the crude enzyme preparation were determined to detect the proper conditions for enzyme activity. Under the specified conditions, the capabilities of the crude L-glutaminase preparation for antimicrobial and antioxidant activities were investigated. Materials and methods A total of 12 recommended microbial strains were screened for highly active L-glutaminase enzyme production. Factors influencing the production of L-glutaminase enzyme were optimized, and the important properties of the crude enzyme were pinpointed. Finally, biological activities of the crude enzyme were investigated as a preliminary index for the validity of the partially purified L-glutaminase form for medical applications. Results and conclusion Among all tested microorganisms, Bacillus subtilis NRRL 1315 was the most potent producer for L-glutaminase enzyme. The maximum glutaminase production was obtained after 48 h of incubation on a rotary shaker (150 rpm) with the medium containing 5 g/l glucose, 0.1 g/l sodium nitrate, and 10 g/l L-glutamine at 37°C and pH 7.5. The important properties of the crude L-glutaminase were duly pinpointed as follows: optimum enzyme protein concentration and substrate concentration were 2 mg/ml and 40 mM, respectively, and optimum reaction pH and temperature were 7.5 and 37°C, respectively. Under the specified conditions, the crude enzyme exhibited considerable 2, 2′-diphenyl-1-picrylhydrazyl radical scavenging activity.
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Statscewich, Hank, Hugh Roarty, Michael Smith, Ed Page, Scott Glenn, and Tom Weingartner. "Enhancing Arctic Maritime Domain Awareness Through an Off-Grid Multi-sensor Instrument Platform." Marine Technology Society Journal 48, no. 5 (2014): 97–109. http://dx.doi.org/10.4031/mtsj.48.5.1.
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AbstractSurface current mapping high-frequency radars were installed along the northwest corner of Alaska during the open water periods of 2011‐2013. A combination of wind and solar renewable energy inputs supplied electricity to a single radar site operating at Point Barrow, Alaska, via an off-grid remote power module (RPM). The radar at Point Barrow was able to simultaneously collect measurements of ocean surface currents, measure the position and velocity of passing vessels, and provide meteorological data in real time. This paper provides a summary of the performance of the power module from 2011 to 2013 and vessel detection results from 2013 with corresponding Automated Identification System (AIS) data. The RPM provided infrastructure to meteorological stations, high-frequency radars, and AIS in a resilient and robust manner and serves as an example of how the multi-use capability of integrated sensor modules can provide enhanced maritime domain awareness and persistent surveillance capabilities in remote Arctic environments.
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Wang, Shuo, Weiran Zhang, Yong Zhang, Jinqiang Zhao, Ruixuan Li, and Yujie Zhong. "Effect of Reduced Graphene Oxide on Microwave Absorbing Properties of Al1.5Co4Fe2Cr High-Entropy Alloys." Entropy 26, no. 1 (2024): 60. http://dx.doi.org/10.3390/e26010060.
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The microwave absorption performance of high-entropy alloys (HEAs) can be improved by reducing the reflection coefficient of electromagnetic waves and broadening the absorption frequency band. The present work prepared flaky irregular-shaped Al1.5Co4Fe2Cr and Al1.5Co4Fe2Cr@rGO alloy powders by mechanical alloying (MA) at different rotational speeds. It was found that the addition of trace amounts of reduced graphene oxide (rGO) had a favorable effect on the impedance matching, reflection loss (RL), and effective absorbing bandwidth (EAB) of the Al1.5Co4Fe2Cr@rGO HEA composite powders. The EAB of the alloy powders prepared at 300 rpm increased from 2.58 GHz to 4.62 GHz with the additive, and the RL increased by 2.56 dB. The results showed that the presence of rGO modified the complex dielectric constant of HEA powders, thereby enhancing their dielectric loss capability. Additionally, the presence of lamellar rGO intensified the interfacial reflections within the absorber, facilitating the dissipation of electromagnetic waves. The effect of the ball milling speed on the defect concentration of the alloy powders also affected its wave absorption performance. The samples prepared at 350 rpm had the best wave absorption performance, with an RL of −16.23 and −17.28 dB for a thickness of 1.6 mm and EAB of 5.77 GHz and 5.43 GHz, respectively.
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Thirumala, M., E. Sai Krishna, P. Sindhu Priya, and S. Vishnuvardhan Reddy. "Characterization of a novel Fluoride resistant bacterial isolate and its capability of Fluoride bioremediation." AIMS Microbiology 8, no. 4 (2022): 470–83. http://dx.doi.org/10.3934/microbiol.2022031.
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<abstract> <p>A Gram positive rod shaped bacterium designated as isolate H1 with Fluoride resistance up to 4 g/L sodium fluoride (NaF) in LB (Luria-Bertani) agar was isolated from a ground water sample of Narketpally area, Nalgonda district, Telangana, India. The colonies of isolate H1 were off white in color. Growth patterns of isolate H1 were observed at two different concentrations, 100 and 250 ppm, of NaF and also without NaF in the medium. In cases where NaF was present in the media, the lag phases of the growth curves were extended when compared to the absence of NaF. Optimum pH required for the organism's growth was 8. Isolate H1 required a temperature of 37 °C with 150 rpm and 2% NaCl for its optimal growth in the medium without NaF. Meanwhile, isolate H1 could thrive in a diverse pH range, i.e., pH 5–10, and at an NaCl concentration of up to 11% in the medium with NaF. Based on morphological, biochemical and molecular characterization, isolate H1 was identified as belonging to the genus <italic>Bacillus</italic>. It showed 98.47% 16S rDNA gene sequence similarity with <italic>Bacillus australimaris</italic> NH71_1<sup>T</sup>. Isolate H1 showed high fluoride removals of 22.5% and 38.2% with 100 and 250 mg/L of NaF in the LB broth when incubated at pH 8 and a temperature of 37 °C with 150 rpm for 3 day. Hence, this organism could be a promising isolate to apply for defluoridation of ground water in fluoride contaminthe ated areas.</p> </abstract>
Book chapters on the topic "High RPM Capability"
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Wang, Zhen, and Jiang Yan. "Design of High-Speed Ethernet Data Loop Communication System Based on FPGA." In Advances in Transdisciplinary Engineering. IOS Press, 2025. https://doi.org/10.3233/atde250312.
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To address the dual requirements of network protocol processing and high-speed data transmission, this paper proposes a network protocol stack solution based on a reconfigurable hardware platform. The architecture integrates pipeline processing technology with an adaptive rate matching mechanism, implementing cross-protocol (ARP/UDP/IP/ICMP) collaborative processing and three-speed Ethernet (10/100/1000Mbps) adaptive switching capability on FPGA hardware-programmable platforms, providing high-performance communication infrastructure for industrial IoT and edge computing scenarios. At the hardware architecture level, the system adopts a hierarchical protocol processing design. The underlying layer establishes a dual-port memory architecture and asynchronous data buffering unit, achieving multi-protocol parallel processing through dynamic priority arbitration mechanism. The middle layer integrates configurable rate matching modules, completing protocol parsing and encapsulation using a hardware description language (HDL)-developed protocol controller cluster (ARP/IP/UDP/ICMP). Considering chip ecosystem characteristics, a minimal IP dependency strategy is adopted, implementing core functional modules exclusively based on fundamental storage units (FIFO/RAM), significantly enhancing design portability. In functional verification, hardware simulation platforms confirm that the protocol stack possesses core capabilities including full-duplex UDP communication, active/passive address resolution, and network diagnostics (Ping). These technological breakthroughs not only resolve the contradiction between network protocol processing capability and transmission bandwidth in existing embedded devices, but also provide crucial technical support for establishing autonomous industrial communication systems.
Conference papers on the topic "High RPM Capability"
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Tajar, Abdul, M. Kumar, D. S. D. Rao, and R. Muthu. "Flight Evaluation of Variation in Rotor RPM on Low Speed Handling Characteristics of Helicopter." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10173.
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This paper describes multi fold advantages of increasing the Rotor RPM to improve low speed handling of helicopters in high altitude operations, where-in the availability of engine power, control margin and air density ratio play an important role. The primary aim of this work was to reduce the tail rotor collective requirement in hover, sideward flight, spot turns and in take-off and landing at high altitudes. The increase in rotor RPM was also proven beneficial for low speed handling at low altitude with high all up weight. Simulations were carried out for different all up weights and altitudes to ascertain the effect of variation of rotor RPM on tail rotor collective, main rotor collective and torque requirement in hover and sideward flight. Effect of increased rotor RPM on main rotor blade loads (mainly flap and lag) was also examined through a six DOF helicopter simulation program. Based on the results obtained from simulations, comprehensive flight testing was carried out to confirm simulation results. Flight test data showed that the increase in rotor RPM reduces tail rotor collective requirement. The reduction in main rotor collective and torque requirement (per engine) with increased rotor RPM was also observed. Enhancement in wind handling capability over the critical azimuth and spot turn capability was established. Fatigue loads marginally reduced with higher RPM than the nominal RPM. Cockpit vibration levels were similar and change was not perceptible with higher rotor RPM. Vibration on tail drive shaft and tail rotor actuator with higher rotor RPM, reduced during hover, left sideward flight and spot turns. The trends were independent of all up weight and altitude. The effect of increased rotor RPM on Engine, Transmission, Flight controls and Maintenance was also assessed during flight testing.
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Amiet, Andrew. "Design, Test and Manufacture of Radar Absorbing Materials for Australian Defence Platforms." In SSPC 2016 Greencoat. SSPC, 2016. https://doi.org/10.5006/s2016-00002.
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abstract The techniques used to measure, design, and test Radar Absorbing Materials (RAM) are described. Absorbing additives are added to polymer materials at a range of concentrations in the laboratory, and then tested over the frequency range of interest to determine the material’s permittivity and permeability. The techniques and algorithms used to extract these values are dependent upon the material under test and the type of information required. Once accurately determined, these values are used in a computer optimization code designed to find the best additive concentration and thickness for each layer of a multilayered material to give the highest absorption levels over the user-specified frequency range. The calculated performance from the multilayered material is displayed in real time and has been found to be in excellent agreement with the measured values. Using the techniques described in this report, radar-absorbing materials can be tailor made to suit a wide range of applications, providing Defence with an indigenous capability for high performance RAM products.
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Warusevitane, Achinie, Kathy Johnson, and Stephen Ambrose. "Numerical Investigation Into Maximum Pressure Capability of Intershaft Hydraulic Seals." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82196.
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Abstract Hydraulic seals are used as intershaft seals in aero-engines and consist of an oil filled trough on the higher speed shaft and a fin on the lower speed shaft that dips into the oil forming the seal. Rotation is imparted to the sealing fluid within the trough and, similar to a manometer in operation the liquid either side of the fin can be at different heights allowing the seal to withstand differential pressure. In normal operation hydraulic seals do not leak air but if the differential pressure becomes too high the seal will break down and leakage will occur. There is limited published research relating to hydraulic seals and the accuracy and reliability of the existing design approaches based on analytical derivations is not fully known. This acknowledged need to improve the ability to develop accurate computational models of hydraulic seals provides context for the current study. An approach to evaluate the maximum pressure capacity of a hydraulic seal is therefore introduced in this work. Building on previously published studies, this paper presents results of a 2D numerical study into the performance of a simplified hydraulic seal geometry. This paper reports a numerical CFD methodology based on an axisymmetric Volume-of-Fluid (VOF) method. In this study there is no oil feed into the trough. Results are presented for a range of shaft speeds of 2000–8000 rpm for the high speed shaft and 1000–4000 rpm for the low speed shaft. Fin position within the trough was varied. A criteria for broken seal was developed. The CFD data shows that the seal can withstand higher pressure at higher shaft speed with the characteristic following the expected linear relationship between differential pressure and shaft speed squared. The seal could withstand a higher differential pressure if the fin was closer to the housing on the high pressure side with this being attributed to the secondary air flow in the cavity. The average core velocity was compared to values obtained using different analytical approaches and it was found that one where core angular velocity is proportional to the area averaged rotational velocities of the housing and fin was the best match to CFD data.
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Swanson, Erik E., James F. Walton, and Hooshang Heshmat. "A 35,000 RPM Test Rig for Magnetic, Hybrid and Back-Up Bearings." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-180.
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Magnetic bearings have long offered the potential for significant turbomachinery system improvements due to their oil-free, non-contact, low loss nature and their ability to actively control shaft dynamic motion. However, end-users and many designers are hesitant to apply this technology. There are two basic stumbling blocks: active magnetic bearings (AMBs) have little overload capacity, and failure of any portion of the AMB system could result in catastrophic damage to the machine. To cope with both of these problems, a secondary back-up bearing must be included in the system. This paper describes a new full scale, high speed test rig which has the capability to test a variety of back-up bearings at speeds of up to 35,000 RPM, and bearing loads of up to 6.7 kN. Preliminary data for two novel back-up bearings are presented as a demonstration of the test rig’s capabilities.
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Walton, James F., Michael J. Tomaszewski, and H. Heshmat. "The Role of High Performance Foil Bearings in Advanced, Oil-Free, High-Speed Motor Driven Compressors." In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1747.
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The demand for high power density, reliable, low maintenance, oil-free turbomachinery imposes significant demands on the bearing system. The full benefits of high speed, motor driven machines, for example are realized at speeds exceeding the capabilities of rolling element bearings. The high speeds, and requirement for oil-free operation in fuel cell applications also make conventional liquid lubricated bearings an undesirable alternative. The modern, oil-free foil bearing provides an excellent alternative, with its low power loss, damping for smooth high-speed operation and shock tolerance, elevated temperature capability and long maintenance free life. In this paper, the application of modern foil bearings to two different high-speed, oil-free compressors is discussed. In each application, foil bearings support a multi-component rotor operating at speeds above 70,000 RPM. Stable and reliable operation over the full speed range is demonstrated in each case. These applications also required low bearing start-up torque for compatibility with the torque characteristics of the integral motor. This work discusses the rotor bearing system design, the development program approach, and the results of testing to date.
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Ejim, Chidirim, Jinjiang Xiao, Woon Lee, and Wilson Zabala. "Performance Envelope of a High-Speed High-GVF Helico-Axial Pump." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213740-ms.
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Abstract Operating a pump at high speeds can have the benefit of increasing the capability of pumps to enhance surface or downhole production of fluids with high gas volume fraction (GVF). This study presents the performance envelope of a high-speed helico-axial pump (HAP) operating at high GVFs (&gt; 80%). The ultimate aim of the physical tests was to ascertain the operating capabilities of the pump for potential scale-up to a field prototype. The HAP housing outer diameter was 5.38-inch and operated at a rotational speed of 6000 revolutions per minute (RPM). Air and water were the test fluids, with average pump intake temperature of 25°C. The fluid volume flow rates were varied to maintain 50 psig at the HAP intake. The liquid and total intake volume flow rates varied from 128 to 664 barrels per day (BPD), and 4941 to 7593 BPD, respectively. The corresponding discharge pressures and temperatures, as well as electrical power input and current draw to the HAP motor, were also recorded. The results showed that the HAP had stable operation during the tests for intake GVF range from 91% to 98%. The corresponding pump discharge pressures were in the range of 58 to 101 psig. This indicated the capability of the HAP to boost fluid pressure even for such high intake gas content. The results also showed that HAP boost pressure was positively correlated with liquid volume flow rates, and negatively correlated with the intake gas volume flow rates. Overall, the boost pressure decreased with intake GVF. The electrical input power to the HAP motor varied between 16 to 37 kW. It was observed to strongly increase with increasing liquid volume flow rate, and very strongly decrease with increasing HAP intake GVF. The associated electrical current draw by the HAP motor was seen to vary between 31 and 68 A. Its variation with liquid volume flow rate and intake GVF was similar to those of the electrical power input. In conclusion, the HAP demonstrated capability to boost fluid pressure when handling high GVF flows. It is being scaled up to a field prototype to handle higher volume flow rates of high GVF gas-liquid mixtures. This study mainly highlights the method to extend the gas-handling capability of a HAP by operating it at high speeds. Optimal hydraulic design and proper conditioning of the inlet flow components were also incorporated in the HAP architecture. Expanding the HAP operating envelope to handle high-GVF flows significantly unlocks the potential for field operators to maximize hydrocarbon production from high-gas content applications. This, in turn, increases the economic bottom-line from the field asset.
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Jones, Steve, and Junichi Sugiura. "A New Generation of Steerable Drilling Motor is Born - Understand the Unique Geometry, Drilling Benefits and Performance Gains." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205999-ms.
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Abstract Steerable drilling motors still dominate US shale drilling applications. Shale well construction is commonly planned with monobore vertical, high dogleg-severity (DLS) curve and lateral sections. Limitations arise in each portion of the wellbore because one single bottomhole assembly (BHA) does not provide optimal results; hence, trips are required to optimize the BHA. The main disadvantage with existing steerable drilling motors is the requirement for high bend-angle settings to drill the high DLS curve portion of the wellbore. The geometry of a high bend-angle motor is only optimal for slide drilling the curve, it is not optimal for drilling the vertical and lateral portions of the wellbore. While drilling the vertical and lateral portions of the well, surface RPM (revolutions per minute) must be limited to reduce the cyclic bending fatigue on the large external bend. Not to mention poor wellbore quality while rotary drilling with a large external bend. To overcome this issue, a new geometry design was required. The new-generation motor uses a tilted internal drive mandrel aligned with a small external bend. This combination delivers the best of both worlds, providing high DLS capability while slide drilling and high surface-RPM capability while rotary drilling (because of the small external bend). Compact embedded drilling dynamics data recorders were used to validate the dynamic improvement of the new steerable-drilling-motor geometry versus older-style geometry with large external bend. The embedded sensors recorded at-point dynamics of shock and torsional response providing detailed comparative data sets during the development phase. The new-generation steerable-drilling-motor technology utilizes point-the-bit rotary-steerable-system (RSS) methods (for example, a tilted mandrel) with conventional steerable-motor methods (for example, an external bend). The combination of the internal tilt and external bend (aligned together) provides a completely new geometry for a steerable motor. This new geometry is beneficial for high DLS sliding capability, high surface-RPM rotary drilling and improved borehole quality (slide/rotate transition and rotary mode). This new steerable drilling motor with enhanced geometry was utilized to prove delivery of vertical/curve/lateral in one run, consistent DLS through the curve and improved tracking in the lateral. The results from development testing (comparing to older-geometry motors) will be described in this paper.
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Ejim, Chidirim, Jinjiang Xiao, Woon Lee, and Wilson Zabala. "Delaying Multiphase Pump Gas-Lock in High-GVF Flows Using High-Speed Operation." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213660-ms.
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Abstract Many pumping systems tend to lose pressure boosting capability at high intake gas volume fractions (GVF) resulting in gas-lock. Delaying occurrence of gas-lock is beneficial to extending the operating envelope of these pumping systems. This study presents the results of operating a multiphase pump at speeds higher than typical, conventional field applications, in addition to incorporating a flow-conditioning device at pump inlet. These attributes delayed occurrence of multiphase gas-lock to intake GVFs up to 98%. The multiphase pump tested had a 5.38-inch housing outer diameter and shaft rotational speed of 6000 revolutions per minute (RPM). A nozzle was installed at the pump inlet to facilitate homogenization. The range of total volume flow rate of air and water at pump intake was between about 4900 to 7600 barrels per day (BPD), with intake pressures approximately 50 psig. The total intake volume flow rates were varied and the pump pressure boost was measured until the pump gas-locked. The results showed that for the total volume flow rates tested, the multiphase pump was able to provide pressure boost of about 55psi at an intake GVF of 91%. For other flow conditions when the intake GVF was increased to 98%, the multiphase pump provided a 10 psi pressure boost. An observation during the test was the gas-liquid mixture flow through a nozzle resulted in a very fine spray mist. With the nozzle installed at the pump intake, a more stable pump operation was achieved throughout the tests. In conclusion, operating the pump at speeds of 6000 RPM facilitated extension of the operating condition when gas-lock occurred in the multiphase pump. Installing a nozzle device was beneficial in conditioning the flow at entry to the pump to ensure stable operating conditions. These findings are being incorporated in a field prototype version of the pump to handle higher volumes of gas and liquid in the field. This study mainly highlights the method used to delay gas-lock in a multiphase pump. Operating the pump at higher than conventional speeds and installing components at the pump inlet to condition the flow are beneficial to ensure the pump continues to deliver pressure boost for intake GVFs up to 98%. Extending multiphase pump operating envelope is desirable for field operators to produce more continuously and economically from wells with very high gas content.
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Boyle, Robert J., Ankur H. Parikh, and Vinod K. Nagpal. "Design Considerations for Ceramic Matrix Composite High Pressure Turbine Blades." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91787.
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Abstract Issues associated with using SiC/SiC Ceramic Matrix Composite (CMC) materials for High Pressure Turbine (HPT) rotor blades are explored. SiC/SiC materials have higher temperature capability than current HPT superalloys. The strength versus temperature characteristics of SiC/SiC CMCs differs from that of superalloys. Stress analyses were done for a NASA specified notional single aisle aircraft engine blade to be available in the N+3 time frame, (beyond 2030). Stacking, the relative position of hub and tip sections, depends on both pressure and centrifugal forces, and material density. The effect of blade stacking on blade stresses is examined. The change in stresses as the rotation rate varies is examined. The change in engine weight, and thus fuel consumption, due to changes in engine size as the rpm changes is discussed. SiC/SiC CMC materials are generally not isotropic. The effect on stresses and strains of a directional variation in Young’s modulus is examined. Shrouding metallic HPT rotor blades is not common. Shrouding SiC/SiC CMC rotor blades may be feasible due to the lower density, and thus lower centrifugal loads, of SiC/SiC blades. The increase in stresses due to shrouding a SiC/SiC blade is discussed.
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ROLANDO, Luciano, Federico MILLO, Giuseppe CASTELLANO, Toni TAHTOUH, Mathieu ANDRE, and Francesco BOCCHIERI. "A Numerical Model for the Virtual Calibration of a Highly Efficient Spark Ignition Engine." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0059.
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<div class="section abstract"><div class="htmlview paragraph">Nowadays numerical simulations play a major role in the development of future sustainable powertrain thanks to their capability of investigating a wide spectrum of innovative technologies with times and costs significantly lower than a campaign of experimental tests. In such a framework, this paper aims to assess the predictive capabilities of an 1D-CFD engine model developed to support the design and the calibration of the innovative highly efficient spark ignition engine of the PHOENICE (PHev towards zerO EmissioNs &amp; ultimate ICE efficiency) EU H2020 project. As a matter of fact, the availability of a reliable simulation platform is crucial to achieve the project target of 47% peak indicating efficiency, by synergistically exploiting the combination of innovative in-cylinder charge motion, Miller cycle with high compression ratio, lean mixture with cooled Exhaust Gas Recirculation (EGR) and electrified turbocharger. Since the engine is expected to operate in highly diluted conditions, particular attention was paid to the definition of a reliable combustion model to accurately predict the burn duration and the occurrence of abnormal combustion phenomena. A preliminary set of experimental data measured at 3000 RPM and 7 bar BMEP, including both EGR and λ variations, was used to assess the predictive capabilities of the model. Afterwards, the developed virtual test rig was exploited to perform a calibration of the engine in terms of optimal λ and EGR combinations and the results obtained for two operating points, a low load 1500 RPM and 5.5 bar BMEP and a high load 3000 RPM and 13 bar BMEP, were presented and discussed. Findings showed that best efficiency values, well above 40% indicated efficiency, could be obtained with moderate dilution and EGR rates thanks to knock suppression capability for the high load point and de-throttling for the low load point.</div></div>