The structure a three-drum shearer as shown in Fig. 1. Through the free mode analysis, the first 20 natural frequencies of the large mining height three-drum shearer are obtained, whereas the natural frequencies of the first 6 modes are zero or close to zero. The first six modes are the moving modes and rotational modes determined by …Web
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The transverse deflections decouple from the axial motion of the beam in the geometrically linear setting, such that the axial transport rate of particles always equals the surface velocity v. This mechanical system can be considered a prototype for various technical processes like the motion of a metal strip on a roller table of a rolling mill ...Web
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The main processes include the following: (1) Establish the coordinate system of each component: the stationary world coordinate system "0" (CS0); the coordinate system "1" (CS1), fixed on the target axis C and moving with the axis; the coordinate systems "2" (CS2) and "3" (CS3), fixed on the polyhedral prism B and moving with the polyhedral prism; the …Web
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The vibration displacements of three parts of shearer body m 3, m 4, and m 7 along the z-axis direction are z 3, z 4, and z 7, respectively (Figs. 5–7). The quality …Web
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The motion of drops on fibers is important to industrial applications such as drop coalescence and drainage in fibrous filter media. This paper reports on experimental results using a Couette flow experimental device to measure drop velocities on fibers resulting from gas flow parallel to the fiber axis. A drag coefficient was defined and …Web
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of the axial load changes, the axial clearance occurs as a displacement. Additionally, when the Ball Screw is provided with a preload, it gains a higher rigidity and a smaller axial displacement than a zero clearance in the axial direction. A xia l disp lacement Axial load ¢´£ ¢´£ ¢y£ ¢y£ Fig.5 Axial displacement Axial clearance: 0Web
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Two coordinate systems (local and global ones) are used for obtaining local and global solutions, and for physically matching the two solutions. The analytical result …Web
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The two-dimensional static mechanics of axially moving cables used in two-ship continuous line bucket (CLB) system for mining manganese nodules from the seabed are theoretically examined. Two coordinate systems (local and global ones) are …Web
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Axial vibration of long marine cables with suspended object and excited by wave-driven top motion is a common problem for the oil & gas subsea construction, …Web
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The analytical result shows that the effect of centrifugal force caused by the axial motion on the flexural loads near the touchdown point is very small. The static equilibrium of the system considering the dynamic friction between the sea floor and axially moving cable is investigated to demonstrate that the rate of collection of the nodules ...Web
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The lifting pipe is a key component of deep sea mining whose dynamic response directly affects the safety of the lifting operation. The objective of this paper was to investigate the effects of heave motion and sailing velocity of mining vessel and the buffer mass on the dynamic response of lifting pipe. First, an equivalent model of the lifting pipe …Web
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Axial Vibration Suppression in a Partial Differential Equation Model of Ascending Mining Cable Elevator Lifting up a cage with miners via a mining cable causes axial vibrations …Web
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The mining ship is equipped with a motor driving the axial motion of the belts. The power necessary for this driving is estimated as follows. The load on the top end of the ascending line is expressed as (1) T A = W A + D A, (2) W A ≡ W B * N A, (3) D A ≡ 1 2 ρ C d S B v 2 N A, where W A and D A respectively denote the total weight of ...Web
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The nonlinear dynamic equilibrium equation with generalized boundary conditions is established based on the Hamilton's principle with considering the combined effects of the axial motion, transverse vibration and hygrothermal environment. Based on the Galerkin method, a set of ordinary differential equations is obtained.Web
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Generally, the influence of rotating motion on chordwise motion is the primary focus of different modeling methods, but it is still necessary to investigate the influence on the axial motion. A pretty different result is exhibited in Figure 6 b; that is, the axial vibration frequency of the proposed model increases with angular speed γ, but ...Web
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This research investigates the laws of focal mechanism and source parameters based on focal mechanism and source parameters analysis of MIEs in three …Web
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Therefore, the main motivation of this paper is to evaluate the impact of axial loads and the application of viscoelastic AFG materials on the stability improvement of structures with simultaneous axial and rotational motion. In Section 2, the dynamical equations of the system are derived using Hamilton's principle.Web
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In this paper, a vessel-pipe coupling dynamic model of the deep-sea mining system, considering the ocean current, the motion of the mining vessel, the vibration of …Web
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The discretized equations of motion. Publisher's summary The first of two books concentrating on the dynamics of slender bodies within or containing axial flow, Fluid-Structure Interaction, Volume 1 covers the fundamentals and mechanisms giving rise to flow-induced vibration, with a particular focus on the challenges associated with pipes ...Web
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Besides, Banichuk et al. [10] developed an analytical approach for computing the limit velocity of stable axial motion for axially moving orthotropic plates, and concluded that the effect of material orthotropy on the critical velocity is negligible. However, the effect of orthotropy has not been examined thoroughly when considering the dynamic ...Web
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The axial equation of motion includes the friction force and the mud-damping force for the axial motion of the drill string. The following dynamic results were reported by Langeveld (1992a,b) using a 2,350-m, 5-in. drill pipe, 150-m of 6 1 2 in. drill collars and three different 8 1 2 in. antiwhirl pdc bits.Web
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Abstract. The second of two volumes concentrating on the dynamics of slender bodies within or containing axial flow, Volume 2 covers fluid-structure interactions relating to shells, cylinders and ...Web
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Noun 1. axial motion - rotary motion of an object around its own axis; "wheels in axial rotation" axial rotation, roll gyration, revolution, rotation - a... Axial motion - definition of axial motion by The Free DictionaryWeb
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The nonlinear equations of motion are obtained via a direct Lagrangian formulation. The method of multiple scales is employed to perform a perturbation analysis of the nondimensional equations of motion to deliver the effective nonlinearity of the lagging and axial modes and the critical conditions for the onset of parametric resonances.Web
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Axial vibration of long marine cables with suspended object and excited by wave-driven top motion is a common problem for the oil & gas subsea construction, sea mining, and oceanographic instrumentation activities.Web
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The motion state of the mining vessel and the axial force of the lifting pipe are obtained by using pull pressure sensor, attitude sensor, signal processing module, and signal acquisition software. In this study, …Web
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When the heaving frequency is lower than 1.0 rad/s, the axial motion of the buffer increases with an increase in the heaving frequency. Within the range between 1.0 …Web
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Bottom line: Scientists thought the drift in Earth's spin axis was primarily due to the lifting of land masses as ice has melted since the last ice age. A new study shows this mechanism can ...Web
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Europe PMC is an archive of life sciences journal literature.Web
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When the wave direction is 90°, the lifting pipe has little effect on the amplitude of the mining vessel motion, and the amplitude of the mining vessel motion with or without the lifting pipe is ...Web
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Fig. 1 shows a simply-supported Rayleigh beam with spinning and axial motions, which is modeled in an inertial xyz frame. The beam are simply supported at both ends and a compressive force P is applied at the ends of the beam. The beam moves axially with moving speed V(t) and simultaneously spins with constant spinning speed Ω.The …Web
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