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Journal articles on the topic 'Axial peak suppression'

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1

Toraya, H., and T. Ochiai. "Refinement of unit-cell parameters by whole-powder-pattern fitting technique." Powder Diffraction 9, no. 4 (1994): 272–79. http://dx.doi.org/10.1017/s0885715600018996.

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The accuracy of the unit-cell parameters refined by using the whole-powder-pattern decomposition method is discussed. Powders of W, ZnO, TiO2, BaTiO3 Mg2SiO4, Al2SiO5 (+α-SiO2), and monoclinic ZrO2 were used as test samples. Two internal standard reference materials of Si and CeO2 and two types of powder diffractometers were used for data collections. The systematic peak-shift was corrected by determining the unit-cell parameters and the error function simultaneously during the whole-pattern-fitting. The estimated standard deviations for sample means ranged from <10 ppm (10−6) in cubic symm
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2

Wang, Weijun, and Zhenggui Li. "Influence of different types of volutes on centrifugal aviation fuel pump." Advances in Mechanical Engineering 13, no. 3 (2021): 168781402110052. http://dx.doi.org/10.1177/16878140211005202.

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High efficiency and low vibration are two hot topics in the field of fluid mechanics. In this paper, different spiral volutes are designed for centrifugal aviation fuel pump based on Velocity Coefficient Method. Physical fields under different operating conditions are simulated by computational fluid dynamics (CFD) software that solved the Navier–Stokes equations for three-dimensional flow (3D-RANS). And theoretical and simulation values of radial and axial forces are analyzed. The unsteady pressure fluctuation based on the steady results at the monitoring point is solved and Fast Fourier Tran
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3

Farag, Ashraf, Jeffery Hammersley, Dan Olson, and Terry Ng. "Mechanics of the Flow in the Small and Middle Human Airways." Journal of Fluids Engineering 122, no. 3 (2000): 576–84. http://dx.doi.org/10.1115/1.1287724.

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Steady divergent flow (inspiration directed) is measured using Laser Doppler Velocimetry in a large-scale model carefully mimicing the morphometry of small human airways. The anatomical features, which induced vorticity in the flow from vorticity free entrance flow, are evaluated under conditions of convective similitude. The flow pattern in the daughter tubes is typical of laminar flow within the entrance to sharp bends (Dean number >500) with rapid development of strong secondary flows (maximum secondary velocity is 45 percent of mean axial velocity). The secondary flow consists of two ma
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4

Wong, K. W. L., J. Zhao, D. Lo Jacono, M. C. Thompson, and J. Sheridan. "Experimental investigation of flow-induced vibration of a sinusoidally rotating circular cylinder." Journal of Fluid Mechanics 848 (June 5, 2018): 430–66. http://dx.doi.org/10.1017/jfm.2018.379.

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The present experimental investigation characterises the dynamic response and wake structure of a sinusoidally rotating circular cylinder with a low mass ratio (defined as the ratio of the total oscillating mass to the displaced fluid mass) undergoing cross-stream flow-induced vibration (FIV). The study covers a wide parameter space spanning the forcing rotary oscillation frequency ratio $0\leqslant f_{r}^{\ast }\leqslant 4.5$ and the forcing rotation speed ratio $0\leqslant \unicode[STIX]{x1D6FC}_{r}^{\ast }\leqslant 2.0$, at reduced velocities associated with the vortex-induced vibration (VI
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5

Sareen, A., J. Zhao, D. Lo Jacono, J. Sheridan, K. Hourigan, and M. C. Thompson. "Vortex-induced vibration of a rotating sphere." Journal of Fluid Mechanics 837 (December 20, 2017): 258–92. http://dx.doi.org/10.1017/jfm.2017.847.

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Vortex-induced vibration (VIV) of a sphere represents one of the most generic fundamental fluid–structure interaction problems. Since vortex-induced vibration can lead to structural failure, numerous studies have focused on understanding the underlying principles of VIV and its suppression. This paper reports on an experimental investigation of the effect of imposed axial rotation on the dynamics of vortex-induced vibration of a sphere that is free to oscillate in the cross-flow direction, by employing simultaneous displacement and force measurements. The VIV response was investigated over a w
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6

Huang, Xiuchang, Zhiwei Su, Sen Wang, Xinsheng Wei, Yong Wang, and Hongxing Hua. "High-frequency disturbance force suppression mechanism of a flywheel equipped with a flexible dynamic vibration absorber." Journal of Vibration and Control 26, no. 23-24 (2020): 2113–24. http://dx.doi.org/10.1177/1077546320915340.

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Flywheels generate speed-related disturbances and induce micro-vibrations that influence the performance of high-sensitivity instruments on board. This study addresses dynamic modeling and disturbance force suppression of the flywheels due to its inherent characteristic structural modes. The disturbance force transmission of a rotating flywheel due to a unit radial force applied at the rim of the wheel body is reported using the three-dimensional finite element method and frequency response function–based substructuring method. The characteristic structural modes for the radial and axial distu
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7

Nakajima, Kunito, Noah Utsumi, Yoshihisa Saito, and Masashi Yoshida. "Deformation Property and Suppression of Ultra-Thin-Walled Rectangular Tube in Rotary Draw Bending." Metals 10, no. 8 (2020): 1074. http://dx.doi.org/10.3390/met10081074.

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Recently, miniaturization and weight reduction have become important issues in various industries such as automobile and aerospace. To achieve weight reduction, it is effective to reduce the material thickness. Generally, a secondary forming process such as bending is performed on the tube, and it is applied as a structural member for various products and a member for transmitting electromagnetic waves and fluids. If the wall thickness of this tube can be thinned and the bending technology can be established, it will contribute to further weight reduction. Therefore, in this study, we fabricat
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8

Teoh, Choe-Yung, and Zaidi MohdRipin. "Dither effect on drum brake squeal." Journal of Vibration and Control 23, no. 7 (2016): 1057–72. http://dx.doi.org/10.1177/1077546315597117.

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This paper describes the dither control system used for suppressing drum brake squeal. The dither force is generated by a piezoceramic actuator installed on the back plate of a drum brake system and successfully quenches the drum brake squeal to background noise level above the critical dither actuation level. The dither is represented as a forcing function in sine waveform in a bi-axial two degrees of freedom mathematical model of drum brake squeal. The model parameters are based on the complex eigenvalue obtained from the mobility measurement and verified with the measured frequency response
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9

Sidharta, Nicholas, and Almanzo Arjuna. "Study on the effect of various burnable poisons on pebble bed reactor with OTTO fuelling schemes using Serpent 2 Monte Carlo code." IOP Conference Series: Earth and Environmental Science 927, no. 1 (2021): 012018. http://dx.doi.org/10.1088/1755-1315/927/1/012018.

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Abstract Pebble bed reactor with a once-through-then-out fuelling scheme has the advantage of simplifying the refueling system. However, the core upper-level power density is relatively higher than the bottom, producing an asymmetric core axial power distribution. Several burnable poison (BP) configurations are used to flatten the peak power density and improve power distribution while suppressing the excess core reactivity at the beginning of the burnup cycle. This study uses HTR-PM, China’s pebble bed reactor core, to simulate several burnable poison (BP) configurations. Serpent 2 coupled wi
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10

Okui, Tsutomu, and Akifumi Yamaji. "PRELIMINARY POWER TRANSIENT ANALYSIS OF THE SUPER FR WITH AXIALLY HETEROGENEOUS CORE." EPJ Web of Conferences 247 (2021): 07002. http://dx.doi.org/10.1051/epjconf/202124707002.

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The Super FR is one of the SuperCritical Water cooled Reactor (SCWR) concepts with once-through direct cycle plant system. Recently, new design concept of axially heterogeneous core has been proposed, which consists of multiple layers of MOX and blanket fuels. To clarify the safety performance during power transient, safety analyses have been conducted for uncontrolled control rod (CR) withdrawal and CR ejection at full power. RELAP/SCDAPSIM code was used for the safety analysis. The results show that the peak cladding surface temperature (PCST) is high in the upper MOX fuel layer. It is also
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11

Weitzmann, M. Neale, Susanne Roser-Page, Tatyana Vikulina, et al. "Reduced bone formation in males and increased bone resorption in females drive bone loss in hemophilia A mice." Blood Advances 3, no. 3 (2019): 288–300. http://dx.doi.org/10.1182/bloodadvances.2018027557.

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Abstract Hemophilia A (HA), a rare X-linked recessive genetic disorder caused by insufficient blood clotting factor VIII, leaves affected individuals susceptible to spontaneous and traumatic hemorrhage. Although males generally exhibit severe symptoms, due to variable X inactivation, females can also be severely impacted. Osteoporosis is a disease of the skeleton predisposing patients to fragility fracture, a cause of significant morbidity and mortality and a common comorbidity in HA. Because the causes of osteoporosis in HA are unclear and in humans confounded by other traditional risk factor
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12

Chen, Shaowen, Zhihua Zhou, Songtao Wang, and Zhongqi Wang. "Numerical investigation of boundary layer suction on certain highly loaded aspirated compressor at low speeds." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 1 (2016): 30–41. http://dx.doi.org/10.1177/0954410016670417.

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Boundary layer suction is considered to be an available approach to restraining or even eliminating flow separation and to improve the aerodynamic performance of the compressor. In this paper, a highly loaded axial-flow aspirated compressor based on a low-reaction design concept is investigated in detail to find an appropriate flow control strategy for boundary layer suction to achieve significant performance benefit. The flow control strategy consists mainly of the arrangement of suction hole and the aspirated flow rate. The geometrical models including aspiration cannulas, stator cavity and
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13

Dai, Wei, Baiyang Shi, Jian Yang, Xiang Zhu, and Tianyun Li. "Enhanced suppression of longitudinal vibration transmission in propulsion shaft system using nonlinear tuned mass damper inerter." Journal of Vibration and Control, May 7, 2022, 107754632210811. http://dx.doi.org/10.1177/10775463221081183.

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This study proposes the use of a novel nonlinear tuned mass damper inerter device in vibration suppression of the ship propulsion shafting system and evaluates its performance. The device consists of an axial inerter and a pair of lateral inerters to create geometric nonlinearity. The system response subjected to propeller forces is determined by using the harmonic balance method with alternating-frequency-time technique and a numerical time-marching method. The force transmissibility and energy flow variables are employed to assess the performance of the device. The results show that the prop
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14

Guo, Yanchao, Xiaochen Mao, Lei Wang, and Limin Gao. "Effect of axial slot casing treatment on a counter-rotating axial-flow compressor aerodynamic performance and stability." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, August 12, 2022, 095441002211190. http://dx.doi.org/10.1177/09544100221119030.

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Counter-rotating axial-flow compressor (CRAC) technology is an important technical way to improve the thrust-to-weight ratio of aero-engines. To explore the stall margin improvement potential of axial slot casing treatment (ASCT) in the CRAC, a two-stage CRAC is selected to investigate the influence of axial position and radial deflection angle of slots on the stabilization capability of ASCT by numerical method. The paper also revealed the stability expansion mechanism of ASCT in the CRAC and the effect of casing treatment on the rotor/rotor interference effect between the front and rear roto
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15

Rana, Sourabh, and Priyanka Jain. "Design of low-profile high-gain wideband circularly polarized low RCS single-layer metasurface antenna using characteristics mode analysis." International Journal of Microwave and Wireless Technologies, March 14, 2023, 1–12. http://dx.doi.org/10.1017/s1759078723000144.

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Abstract In this paper, a novel circularly polarized (CP) high-gain low-profile single-layer metasurface (MTS) antenna fed by a coplanar waveguide is presented for wideband low radar cross-section (RCS) applications. Characteristics mode analysis (CMA) technique is employed to simultaneously excite the useful modes rather than using conventional technique to achieve circular polarization in the wideband. By analyzing the characteristics modes of the antenna, gain of the antenna is also improved. Experimental results verify good performance of the proposed antenna with a compact size of 0.67λ0
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16

Petrolo, D., M. Ungarish, L. Chiapponi, V. Ciriello, and S. Longo. "Experimental verification of theoretical approaches for radial gravity currents draining from an edge." Acta Mechanica, September 24, 2021. http://dx.doi.org/10.1007/s00707-021-03066-6.

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AbstractWe present an experimental study of inertial gravity currents (GCs) propagating in a cylindrical wedge under different drainage directions (inward/outward), lock-release (full/partial gate width) and geometry (annulus/full cylinder). We investigate the following combinations representative of operational conditions for dam-break flows: (i) inward drainage, annular reservoir, full gate; (ii) outward drainage, full reservoir, full gate; and (iii) outward drainage, full reservoir, partial gate. A single-layer shallow-water (SW) model is used for modelling the first two cases, while a box
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