Space propulsion devices such as electric and chemical propulsion, yield a wide-range thrust from nN to kN and have weights from grams to ten of kg. Hence, some thrusters have a thrust-to-weight ratio below 1. Especially for low thrust-to-weight ratios, the thrust was measured with thrust...
For transfers with thrust-toweight ratios on the order of 10-3～10-1,direct control parameterization is utilized;for transfers with thrust-to-weight ratios on the order of 10-5～10-4, orbital averaging is employed. A set of equinoctial elements is used to govern the equations of motion, ...
and by using the powerful nanomotors, we further realized autonomous nanorobots working like conventional robots with precise motion control. Our nanomotors exhibit the highest thrust-to-weight ratios thus far, while achieving nanoscale step accuracy, ultralow actuation ...
Low-thrust Earth-orbit transfers with 105-order thrust-to-weight ratios involve a large number of orbital revolutions which poses a real challenge to trajectory optimization. This article develops a direct method to optimize minimum-time low-thrust many-revolution Earth-orbit transfers. A parameterized...
Typical rendezvous missions to low Earth orbit space stations for an active spacecraft with different thrust-to-weight ratios (or thrust acceleration) are studied. The method of pseudo-impulse sets is used for the...关键词: corporate style guide user-interface design cost-benefit analysis ...
RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook net thrust [′net ′thrəst] (aerospace engineering) The gross thrust of a jet engine minus the drag due to the momentum of the incoming air. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Cop...
The objective of the nozzle is to produce a steady flow of high-velocity gas parallel to the centerline of the nozzle in order to produce thrust along that line of action. Since all aerospace vehicle operations are constrained by weight considerations, it is desired that the nozzle be as ligh...
In contrast, typical island-arc picrites as defined by the IUGS33have SiO2 < 52%, MgO > 12%, total alkali content of 3%, and have positively fractionated HREE patterns with (Gd/Yb)cn > 1.5, and Al2O3/TiO2ratios that are chondritic to subchondritic9. As shown by the ...
Tl denotes the driving torque to be applied to the load, bn denotes the equivalent damping of the actuator to be converted to the motor rotor, Jn denotes the moment of inertia to be converted to the motor rotor, N, Ng and Lb are the ratios of motor rotation to drive bar translation, ...
1, King Hubbert, 1937; Ramberg, 1981) where σ⁎,ρ⁎, g⁎ and L⁎ represent the ratios of stress, density, gravity and length between the model and the natural example. The gravity ratio is g⁎ = 1 and the density ratio ρ⁎ corresponds to ca. 0.6 (Table 2), so that ...