173 results about "Torsional angle" patented technology

The invention discloses a calibration method of a fish-eye lens imaging system applied to target detection, which comprises the step of mathematical modeling of the fish-eye lens imaging system based on an equidistant projection and the precise calibrations of the intrinsic parameters of the imaging system (including the central point O3(u,v) of an imaging surface), the distance L between the top section of the fish-eye lens and a theoretic refractive optical center plane, the radial distortion coefficient K of the fish-eye lens, an image element aspect scale factor i, the plane torsional angle gamma between a camera coordinate system and an imaging surface coordinate system, various parameter calibration methods and matched software. The method aims at the omnidirectional vision system based on the fish-eye lens, analyzes the optical structure and the imaging principle of the fish-eye lens and introduces deformation parameters so as to establish the physical model of the fish-eye lens imaging system and then deduce the mathematical model of the system. With an independently-developed calibration procedure, three-dimensional space information is obtained from a two-dimensional image and applied to the calibration of imaging system parameters. The method is applicable to the calibration of various fish-eye type panoramic lenses, is convenient and accurate and has strong practicability.

An engine control system includes an engine that outputs a rotation of a crankshaft through a torsional damper; a calculation portion that calculates a value of engine torque based on an angular acceleration of the crankshaft and a moment of inertia of the crankshaft; and a correction portion that calculates a correction value based on a torsional angle of the torsional damper, and corrects the calculated value of the engine torque using the correction value.

The present invention relates to a method for processing a TC11 material vane. The method can conveniently machine out a TC11 material aviation vane which has large torsional angle, large string width, large rough blank profile margin and uneven margins at all positions and is easy to machine. The method comprises the steps as follows: retesting a central forging hole, processing the back of a middle body, a technical reference of the air outlet side and a vane top axial reference face, rough machining a vane root and a vane root bottom surface technical button, processing for reverse adjustment, finish milling the profile, polishing the profile, processing the total length, removing a vane top central hole and removing the vane root bottom surface button. The present invention is characterized in that the vane top central hole during swaging processing is always kept until the total length is cut; a forging vane top central hole is considered as the reference; after the distressing treatment, the reverse adjustment is conducted, and the vane root and the surface of the vane root bottom surface technical button is fine finished; a vane root positioning area is increased, so the technical button is reserved at the vane root bottom surface, a vane root molding knife is used for processing the vane root and the surface of the vane root bottom surface technical button to ensure that the surface of the vane root bottom surface technical button is consistent with the vane root; and when milling comprehensively, the vane root and the surface of the vane root bottom surface technical button are used for positioning, and the vane profile is rough milled and fine milled.

The invention relates to a wind turbine driving system torsional vibration measurement method and a wind turbine driving system torsional vibration measurement device. The method includes the steps of: synchronously collecting pulse signals of the rotating speed of the front end of a principal shaft of a driving chain and the rotating speed of the tail end of a power generator, and conducting A/D (Analog to Digital) conversion on the signals; calculating the shafting equivalent speed difference of the driving chain; conducting fast Fourier transformation on an equivalent speed difference sequence signal to obtain a frequency domain signal of the equivalent speed difference sequence signal; filtering the frequency domain signal; and working out the torsional angle acceleration and the torsional angle through Fourier differential and integral inverse transformation. The device comprises two rotary encoders which are respectively installed at the front end of the principal shaft and the tail end of the power generator, and a signal processing unit connected with the two rotary encoders. The device disclosed by the invention requires no independent signal acquisition unit and is simple in structure, small in size, stable and reliable in performance, long in service life, and can effectively get rid of noises and interfering signals to obtain accurate shafting torsional angle.

Disclosed is a layered fairing method for a complex curved surface. The method particularly includes the following steps: step 1, adopting a cubic B-spline curve to respectively interpolate given design data points to acquire all section shape lines namely tolerance baselines; step 2, fairing each section shape line, and lofting to acquire a reference curved surface; step 3, extracting three iso-curvature lines on the curved surface according to a preset method to serve as keel lines, respectively projecting the keel lines on a ruled surface of average normal vector span of curved surface points where the keel lines are positioned, and acquiring three projection keel lines; step 4, integrally fairing the projection keel lines in a projection plane according to a constraint condition that scaling, rotating and translation transformation of the section shape lines in a projection plane meets profile degree, position degree and torsional angle tolerance of the section shape lines to acquire transformation amount of the section shape lines, and re-lofting to acquire a faired curved surface. By the layered fairing method, the problem of fairing of the curved surface is converted into the problem of fairing of the section shape lines and the keel lines of the curved surface, so that the problem is greatly simplified, and the curved surface after being faired is ensured to be capable of meeting requirements on designing and processing.

The invention relates to a static rigidity detection method, in particular to a method for detecting static rigidity of a light passenger car body, which comprises the following steps: applying a certain torque to the front part of the passenger car body by utilizing a lever, acquiring displacement deformations at two longitudinal beams of the passenger car body, calculating a torsional angle of the passenger body and calculating the slope f a fitting straight line according to the results of opposite torsional angles between a front axle and a rear axle of the passenger car body to obtain the torsional rigidity of the passenger car body; then, applying a certain bending moment to the middle part of the passenger car body by utilizing the lever or a weight, acquiring displacement deformations at the two longitudinal beams of the passenger car body, calculating the bending rigidity of the passenger car body according to maximal applying force and maximal deformation; finally, describing a torsional and bending curve by utilizing the data of the torsional and bending displacement deformations of the passenger car body and judging whether the partial performance of the passenger car body is proper according to the curve. The invention not only can obtain the static rigidity value of the passenger car body, but also can validate the accuracy of CAE analysis results and detect the result accuracy, thereby having higher reliability.

The invention relates to a low-wind-speed variable-speed variable-pitch wind turbine blade optimum design method, and belongs to the technical field of wind power generation. According to the low-wind-speed variable-speed variable-pitch wind turbine blade optimum design method, the largest annual energy output and the lowest material cost under the low-wind-speed condition serve as targets, a high order bezier curve is used for defining the chord length and the torsional angle of a blade on the overall length, and optimum control over the best pitch angle and torque-rotating speed is carried out while blade pneumatic shape optimization is carried out. Meanwhile, on the premise that the power generation amount and the lowest material cost are guaranteed, optimal solutions of the chord length and the torsional angle of each cross section of a blade are calculated through an optimization algorithm. The chord length of the wind turbine blade optimized through the method is greatly reduced, the blade area is reduced, the manufacturing material is effectively saved, reduction of the manufacturing cost is facilitates, and meanwhile, the annual energy output is effectively increased.

A low Reynolds number air propeller profile determining method comprises the technological approach of determining blade chord length distribution and corresponding torsional angle distribution. The influence of the Reynolds number on blade aerofoil aerodynamic performance is introduced in the low Reynolds number air propeller profile determining method. Based on a hypothesis of a propeller rigidity helical trailing vortex, the blade chord length and the torsional angle distribution of a propeller are solved through an analysis and iteration method, the optimal chord length and the optimal torsional angle distribution of blades under the low Reynolds number are obtained, and accordingly aerodynamic profile determining of the low Reynolds number air propeller is completed. Rapid and efficient determining of the low Reynolds number air propeller profile is achieved, the tension requirement is automatically met, and aerodynamic profile shaping of the low Reynolds number air propeller is completed with maximum efficiency.

The invention discloses a liquid crystal display device. The liquid crystal display device is characterized in that, based on the matching of intraframe precharging and high-low level signals of array common lines, high-voltage charging is carried out on pixels before each correct data signal is written to the pixels, i.e., the overdrive is carried out before the correct data signals are written to the pixels. The invention also discloses a signal driving method of the liquid crystal display device. Compared with the prior art, the liquid crystal display device has the following advantages: firstly, a frame buffer is not used, so that the cost is saved; secondly, a complex timing function is not needed for overdrive; and thirdly, if the traditional mode that signals are compared accordingto a table for carrying out overdrive, the phenomenon that the liquid crystal is driven instantaneously to cause incorrect torsional angles can be greatly avoided.

The invention provides a MEMS micro vibrating mirror and a manufacturing method for prefabricating an MEMS micro vibrating mirror based on SOI top silicon. Before bonding to form an SOI wafer, a specific microstructure is prepared by micromachining on the back side of the top silicon to remove the partial mass of the mirror surface and maintain the structural strength and size of the mirror, meanwhile, a chamber is prepared in advance on the front side of the bottom silicon according to the size of the space required for the torsional motion of the mirror, then the micro-structured sides of the top silicon and the bottom silicon are aligned and bonded to form the SOI wafer and then thin the SOI wafer to the target thickness by the grinding and polishing process, and finally, a metal reflective layer and a mirror movable structure required are processed and manufactured on the front surface of the top silicon, so that the problem of torsional angle and performance of the vibrating mirror due to overlarge mass of the large-sized mirror surface structure of the MEMS micro vibrating mirror processed by the conventional SOI wafer is solved, thereby expanding the degree of freedom of MEMS micro vibrating mirror design and processing, and improving the performance of the MEMS micro vibrating mirror, and being of great significance especially for the fabrication of the MEMS micro vibrating mirror with high reliability and large mirror size.

The invention relates to a torsional vibration damper, in particular to a separated flywheel. The invention is provided with an enter piece and an output piece. The output piece stands against the resistance of at least one energy storage device. Besides, the output piece can turn relative to the enter piece from a certain torsional angle, resisting the resistance of a floating stop spring device relative to the energy storage device additively. The invention is characterized in that the stop spring device comprises two end parts coupled with each other, and these end parts can restrictedly move towards the same direction or opposite directions.

The invention provides an online diagnosis method for reciprocating mechanical failure, which includes a parameter setting module, a signal collecting module, a data processing module, a failure judging module, a humorous frequency recording module, a data displaying module and a data keeping module. The parameters set by the parameter setting module are connected into the signal collecting module to measure the signals like torsional vibration, pressure and temperature, etc, of a target to be measured, and judge whether a voltage signal is within the parameter scope in channel setting or not, partially access the torsional vibration signal in the collected signals into the data processing module, implement FFT treatment on data and implement calculation treatment on torsional angles; the signals except the torsional vibration signal directly enter the next flow and the data respectively enters the humorous frequency recording module, the failure judging module and the data displaying module. The online diagnosis method for reciprocating mechanical failure can judge the types of the generated failures according to the torsional vibration signal and the spectrum analysis result thereof as well as the parameters like cylinder pressure, oil temperature, water temperature and temperature discharge.

The invention discloses a wind turbine aerodynamic-designing method considering static and dynamic influence of designed tip speed ratio on a wind wheel. The method uses a wind turbine closed loop performance index-average wind energy capture efficiency as a target function, the originally designed tip speed ratio, chord length and torsional angle separation optimizing process is improved into united optimization, so that wind-turbine aerodynamic design originally ignoring Maximum Power Point Tracking (MPPT) control dynamic can consider the shortcomings of tracking performance, and accordingly the static aerodynamic performance and tracking dynamic process of a wind turbine are coordinated. The method can effectively improve the wind energy capture efficiency of a variable-speed fan at turbulent-flow wind speed.

The invention provides an apparatus for large-torque torsional fatigue tests of shaft parts, belonging to the technical field of material testing. The apparatus comprises two hydraulic oil cylinders, two crossbeam pedestals, a crossbeam, a testing shaft, a connecting flange, a fixed pedestal, a torsional angle displacement sensor, an oil pressure sensor and a hydraulic pressure control system. The two crossbeam pedestals and the fixed pedestal are fixed via foundation bolts, and then pressure oil is controlled to separately and alternately enter the two hydraulic oil cylinders, so alternate fatigue load can be applied to a to-be-tested shaft; and pressure oil is controlled to enter one of the two hydraulic oil cylinders while the other hydraulic oil cylinder is unloaded, and oil supply pressure is continuously increased, so the limit torsional load of the to-be-tested shaft can be tested. The apparatus provided by the invention can realize testing of the alternate fatigue load and limit torsional load of shaft parts, and is simple in structure, great in loading capability, high in work efficiency and easy to operate.

The invention relates to a kinematics analysis method for a drilling arm of a drill jumbo based on a coordinate fixed denavit- hartenberg (CFDH) method. The method includes the steps of firstly determining link parameters including dimension parameters of linkages and relation parameters of adjacent linkages, wherein the dimension parameters include link length and link torsional angle, and the relation parameters include link distance and joint rotation angle; simplifying the drilling arm into a structure of a multi-joint robot; by setting each rod piece coordinate system of the drilling arm,determining a coordinate conversion matrix of adjacent rod pieces, and applying the CFDH method to establish a kinematics equation of the drilling arm of the drill jumbo; and finally drawing an effective working space of the drilling arm of the drill jumbo in a MATLAB according to the established kinematics equation. According to the method, the problem that it is difficult to determine a coordinate system in drilling arm research is solved, and the establishment of a coordinate system group is intuitive and accurate, which provides an effective means for the kinematics analysis of the drilling arm of the drill jumbo.

The invention relates to the field of aircraft paddle torsional angle detection, in particular to a composite-material-based paddle torsional angle detection device of an unmanned aerial vehicle. Thedetection device is composed of a pedestal, a lower paddle root fixation block, an upper paddle root fixation block, a lower profile fixation block, an upper profile fixation block, a tip support block fixed on the pedestal, a paddle root profile measuring clamp clamped at a paddle root of a to-be-detected paddle, a first profile measuring clamp clamped at a body of the to-be-detected paddle, a second profile measuring clamp clamped at the body of the to-be-detected paddle. The lower paddle root fixation block and the upper paddle root fixation block form a first clamping part jointly and thelower profile fixation block and the upper profile fixation block form a second clamping part jointly. According to the composite-material-based paddle torsional angle detection device, the profile measuring clamps are installed at a to-be-detected profile of a paddle naturally and then an angle measuring instrument is installed at a measuring clamp platform, so that a torsional angle is measureddirectly. The detection device has a reliable and stable structure; the measured data are accurate; the paddle quality is ensured greatly; the working efficiency is improved, and the production cost is reduced.

The invention relates to an automatic motor stator welding system. The automatic motor stator welding system is composed of a torsional angle assembly (1), an inner expansion assembly (2), a pressing assembly (3), a feeding and discharging supporting assembly (4), a shielding and dust removing system (5), a welding system body (6) and a robot system (7). According to the core, a stator is driven through a servo motor, the stator torsional angle is achieved in cooperation with torsional angle blades on the two sides, an inner taper sleeve is downwards pulled through a hydraulic cylinder to expand multiple sections of expansion blocks to expand an inner hole of the stator tightly, a gland is pulled tightly through the hydraulic cylinder to press the stator, MIG is carried out to weld the stator through double robots at the same time, and the automatic motor stator welding system can adapt to welding of complex situations of the stator torsional angle and flanges.

The invention relates to a self-lubricating rubber bushing and a preparation method thereof and particularly relates to a self-lubricating rubber bushing for an automobile and a preparation method of the self-lubricating rubber bushing. The self-lubricating rubber bushing comprises natural rubber SIR20, butadiene rubber BUNACB22, zinc oxide, stearic acid SA, an anti-aging agent RD, carbon black N550, naphthenic oil Nytex820, oleamide KEMAMIDEU, ultra-high molecular weight polyethylene XM220, paraffin Antilux654, an accelerant CBS and sulphur S200-1. The rubber bushing disclosed by the invention has high radial rigidity and approximately-zero torsional rigidity so as to be suitable for a special service condition with large torsional angle for a long term; and if being used for a long term, the bushing is low in abrasion and long in service life and can still be favorably used under a low-temperature condition.