6results about How to "Reduce eccentricity error" patented technology

The application discloses a kind of based on double hall sensing's metering device and method, belong to fluid metering technical field.The device includes impeller assembly, double hall sensing module, signal processing unit, main control unit and storage unit;First Hall sensor and second Hall sensor of double hall sensing module are arranged at the outer periphery of impeller rotation track with non-180 degree angle, for detecting the magnetic field change generated by the rotation of permanent magnet on impeller and outputting two-way pulse signal;Main control unit calculates synthetic instantaneous frequency, inquires pre-stored mapping table to obtain compensation coefficient, and dynamically corrects pulse equivalent to calculate flow.This application perceives the micro-dynamic of impeller through double hall, identifies the flow rate distribution distortion caused by water pressure fluctuation, automatically corrects pulse-flow conversion coefficient, without pressure sensor, compresses ±5% error generated by traditional single hall water meter due to pressure change to within ±1%, significantly improves the measurement accuracy.

The present application relates to a kind of ceramic base pipe material circumferential tensile test method, it is related to test field, including the following steps: put expansion plug into the inside of tubular sample, and make expansion plug be located in the center of gauge section, again insert boss indenter with convex section into two ends of sample respectively;Preload is applied to boss indenter and is kept, after heating, keep for 5 minutes;Expansion plug is extruded by boss indenter to make it axial shortening and radial expansion, sample is not stressed;Subsequently, force value increases, expansion plug and sample inner wall are completely attached and begin to extrude inner wall, force value increases to drop load;Load and displacement data are collected throughout, after test, remove zero load data before preload and load sudden drop data after fracture and carry out smoothing processing;Finally, using the minimum method of residual sum of squares confirms inflection point and calculates the circumferential tensile strength and circumferential elastic modulus of sample, the present application has the advantage that can efficiently realize SiC pipe high temperature circumferential tensile mechanical property test.

The application relates to the technical field of cable detection, and discloses a cable insulation thickness detection method and system based on sub-pixel edge enhancement, which comprises the following steps: collecting a cable cross-section image, performing adaptive gray balance and noise suppression processing on the cable cross-section image to obtain an enhanced gray image, constructing a gradient direction histogram based on the enhanced gray image, extracting pixel-level edge candidate points, constructing a sub-pixel fitting and edge gradient confidence weighting graph, strengthening a weak boundary to complete a broken part to generate a complete edge loop, calculating the insulation thickness along the circumferential direction and calibrating and determining, and effectively improving the insulation thickness detection precision and the adaptability to complex working conditions.

This invention discloses a micro-thrust measurement device and method. The micro-thrust measurement device includes a working base plate, a pivot and fixing module, a three-axis displacement stage, a torsion beam, a linear guide rail, a displacement sensor, a micro-thrust generator, and a counterweight. The linear guide rail is mounted on the working base plate and consists of a long guide rail and a short guide rail. The torsion beam is positioned between the long and short guide rails. Slider blocks are installed at the ends of both the long and short guide rails furthest from the torsion beam. The slider of the long guide rail houses a micro-thrust motor for measuring the micro-thrust, while the slider of the short guide rail houses a counterweight. The displacement sensor and the micro-thrust generator are respectively located on both sides of the long guide rail. The three-axis displacement stage is mounted on the torsion beam via the pivot and fixing module. This invention enables sub-millinewton-level micro-thrust testing of micro- and nano-satellite micro-propulsion systems. It is easy to operate, improves measurement accuracy, increases the measurement range of the testing system, and reduces costs.

The utility model relates to a weighing device for kitchen waste. The weighing device comprises a lifting assembly and a weighing assembly. The lifting assembly comprises a moving platform, a lifting rack is installed on the moving platform, a lifting motor module installed on the top of the lifting rack drives a lifting frame to move in the vertical direction, and a hanging bracket is installed on the right side of the lifting frame through a mechanical arm. The weighing assembly sequentially comprises a base and a weighing platform from bottom to top, and a weighing sensor is installed in the middle of the weighing platform. The lifting assembly composed of the lifting motor module and the hanging bracket is integrated, the kitchen garbage can on the ground can be automatically lifted to the weighing platform, manual carrying is reduced, labor intensity is lowered, and the lifting device is particularly suitable for large-capacity garbage can scenes.

The utility model discloses a kind of OTA performance test high-low temperature rotary table devices of phase center self-stabilization, including rotating base mechanism, rotary table support, pitch adjustment mechanism, translation adjustment mechanism, wave-through heat preservation cover and temperature control equipment, through the accurate adjustment of translation adjustment mechanism, drive measured piece translation before and after, make the physical center of measured piece and the rotating shaft of rotating base mechanism concentric;Since the rotating shaft of rotating base mechanism and the darkroom quiet zone center accurate alignment, and the center mark line of wave-through heat preservation cover and the quiet zone center alignment, finally realize the rotation center of measured piece and phase center coincide, effectively avoid the test error caused by eccentric, by temperature control equipment generates high-low temperature gas, realize temperature isolation of temperature control area and normal temperature area, satisfy the full temperature zone OTA performance test demand of measured piece.