The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes an Inchworm Boring Robot(IBR) which is a type of wireline robot for planetary subsurface exploration. The IBR has two key tools-excavating auger and discharging auger which are directly interacted with the planetary regolith in the drilling process. For obtaining the drilling load characteristics of IBR, an inchworm-type drilling test-bed was developed for the drilling test of...
A material vertical vibration conveying method based on a vibratory plate's anisotropic friction surface is proposed in this study. In order to explain the material's movement behavior, a mechanical model of interaction between the material and plate is established and solved by the numerical method. The effects of equivalent coefficient of sliding friction in different directions, maximal exciting...
A harmonic horizontally vibratory conveying method based on a vibrating plate with zigzag morphology was proposed. Especially, the method is suitable for low gravity environment on lunar surface. In this paper, the feasibility of method and the effect of vibration conditions to particles unidirectional conveying characteristics were simulated by the discrete element method (DEM). The results indicate...
The impact type penetrator is a compact, lightweight and low power consumption device, using internal hammering mechanism to move downward by compaction of lunar soil in space exploration. This paper proposes an optimal design method for the impact type penetrator. The method main to optimize the structure parameters for housing element (M2), suppressor element (M0) and hammer element (M1) of the...
An augmented continuum theory, based on lattice dynamics theories, is developed to examine the elasticity of three-dimensional crystalline Si materials. The second-order elastic constants of Si can be expressed as the function of the force constants, with the modified Keating model. The phonon dispersion relations have been calculated by using the density functional perturbation (DFP) theory, from...
The traditional elastic theories based on the continuum assumptions may not be directly applicable for microsystems and nanosystems without any modification. In this paper, an augmented continuum theory, based on lattice dynamics theories, is developed to examine the elasticity of three-dimensional Si materials. The second-order elastic constants of Si can be expressed as the function of the force...
The characteristic of the magnetic suspended floating raft isolation system was analyzed and the dynamic model of the system was developed. An active fuzzy controller was designed for the floating raft isolation system with active magnetic suspended isolator. The optimal force of the active magnetic isolator was obtained by fuzzy control algorithm to isolate effectively. Force transmissibility, input...
In this paper, a prototype miniature of flywheel energy storage system is developed. The structure and dynamics characteristic of the flywheel energy storage system are discussed. The system consists of a disk-shaped rotor, active magnetic bearing (AMB), PED controller, displacement sensor and cabinet, etc. The rotor is suspended by three active magnetic bearings (AMB). A mathematical model of the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.