43 results about "Triangular function" patented technology

A method for identifying human face attitude based on statistic model includes labeling out character points on human face, knowing shape variation of human face by utilizing labeled character points when human face is rotated in depth direction, using triangular function to present variation angle of human face attitude, seeking out angle mapping of shape variation to attitude variation for identifying human face attitude by checking variation of human face character.

The invention discloses a servo-motor acceleration-deceleration control method for a servo pressure machine, comprising the following steps of: constructing an acceleration function of a servo motor at an acceleration stage; establishing a speed expression of the servo motor at the acceleration stage; establishing a rotary displacement expression of the servo motor at the acceleration stage; constructing an acceleration function of the servo motor at a deceleration stage; establishing a speed expression of the servo motor at the deceleration stage; establishing a rotary displacement expression of the servo motor at the deceleration stage; and determining total acceleration time and total deceleration time. According to the servo-motor acceleration-deceleration control method, two triangular functions with different periods are adopted as acceleration-deceleration constructed functions of the servo motor, so that the change of the speed, the acceleration and the accelerated acceleration is continuous, the soft shock of the acceleration-deceleration process on the machine body is avoided, the operation stability of the pressure machine is improved and the softness of acceleration-deceleration control of the pressure machine is higher; and by full utilization of the constant and maximum output torque of the server motor under the rated rotating speed, the operation period of the servo pressure machine can be shortened and the takt time of stamping production is improved.

The invention discloses one triangle function limit micro variable flow method, which comprises the following steps: setting displacement transducer connection set to get needed basic voltage; using each base frequency and frequency function or different function to form triangle function limit micro variable equation with two sides as input and output signals; setting sine function transducer, power electron switch and outside circuit to get the analysis variable equation topological circuit and integrating the angle frequency and difference to form integral logic control.

The invention provides a method for rapidly implementing sector conversion in a multi-beam image sonar. An acoustic signal is radiated by a transmitting transducer by using the multi-beam image sonar; a target echo is received by a receiving transducer; beam forming processing is performed on the echo data to acquire a target scene image output in a polar coordinate mode; and a sector conversion module is used for conversing the acoustic image of the polar coordinate into the acoustic image of a rectangular coordinate to conform to the visual sense habit. When the sector conversion is realized on the image sonar based on the beam forming, triangular function operation or anti-trigonometric function operation is not needed in the hardware such as field programmable gata array (FPGA). The method comprises the steps of: (1) identifying the resolution ratio of a display used for displaying the acoustic image of a rectangular coordinate; (2) calculating the resolution ratio of horizontal and vertical distances of the image of the rectangular coordinate according to the actual range of the horizontal and vertical distances of the image sonar; (3) calculating the values of the horizontal and vertical coordinates of the polar coordinate corresponding to some point according to the horizontal and vertical coordinates at the point of the image of the rectangular coordinate; (4) obtaining an index value of the horizontal and vertical coordinates of the polar coordinate of the point according to a beam forming principle; (5) storing the image of the polar coordinate image into a memory, reading the corresponding pixel amplitude value according to the index value of the horizontal and vertical coordinates of the polar coordinate, and assigning the value to the position corresponding to the rectangular coordinate; and (6) completing mapping between each point and the polar coordinate under the rectangular coordinate to obtain the acoustic image of the rectangular coordinate.

The invention provides a low-overhead iteration triangular function device based on a T_CORDIC (Coordinated Rotation Digital Computer) algorithm. The low-overhead iteration triangular function device comprises a pre-processing module, a rotary direction predication module, a CORDIC algorithm compressive iteration multiplexing module, a cut-off fixed-point multiplier multiplexing module, a state control module and a post-processing module, wherein the pre-processing module is used for finishing conversion of an input angle from a floating point format to a fixed point format of IEEE-754 standards and judging whether a Taylor algorithm is started or not; the rotary direction predication module is used for providing sign prediction on compressive iteration in the CORDIC algorithm and providing a multiplicator for parallel computing; the CORDIC algorithm compressive iteration multiplexing module is used for finishing calculation of front n/2 times of compressive iteration in the CORDIC algorithm; the cut-off fixed-point multiplier multiplexing module is used for finishing the calculation of a Taylor expansion equation in the former period and finishing the calculation of parallel iteration in the CORDIC algorithm; the state control module is used for coordinating the multiplexing of the CORDIC algorithm compressive iteration multiplexing module and the cut-off fixed-point multiplier multiplexing module; and the post-processing module is used for selecting result output of a triangular function according to a result signal judged by the pre-processing module and converting the result to the floating point format of the IEEE-754 standards from a fixed point. The low-overhead iteration triangular function device based on the T_CORDIC algorithm has the advantages of simple principle, low delay, low errors, low overhead and the like.

A jitter inducing circuit receives a reference pulse train and induces desired amounts of jitter to the rising and/or falling edges of the pulses. First and second delay blocks 16 and 18 alternately delay the selected edge or edges of the provided reference pulse train interval by preset delay times for every interval. A signal composer 46 composes the outputs of the first and second delay blocks 16 and 18. A delay time setup circuit controls the delay times of the delay blocks 16 and 18. The delay times may change for each interval as a function of time so as to trace a desired function such as a sinusoidal or triangular function.

The invention relates to a saw-blade saw bit with bionic sawteeth for cutting maize straws, which belongs to the technical field of the simulation of agricultural machinery. The curve of the sawteeth in the saw-blade saw bit is similar to that of the outer contour of Chondracris rosea rosea cutting teeth, and a polynomial expression of a triangular function of a single curve unit is as follows: y=184.2sin(0.004499x+0.04364)+72.21sin(0.009018x+1.696)+48.33sin(0.0176x+2.394)+38.07sin(0.03065x-1.964)+11.13sin(0.07535x-0.5685)+13.37sin(0.03792x-1.018)+2.744sin(0.06923x+0.3267)+11.63sin(0.04853x+4.342), wherein x is more than or equal to 0 and less than or equal to 667; and compared with a traditional straight-sectional sawtooth structure or the traditional sawtooth structure consisting of straight sections and arc sections, the sawtooth curve structure can reduce the cutting resistance in the cutting process, so that the power consumption for cutting the maize straws can be reduced by 13 percent, the phenomenon for seizing the saw bit can be reduced, and the abrasion resistance and the working efficiency of the sawteeth can be improved.

The invention relates to a method and a device for measuring off-axis optical non-spherical mirror vertex radius. The method includes: using the feature that normal of different points on an off-axis optical non-spherical mirror intersects with an optical shaft at different points and combining reflector law and triangular function relation of light to determine the included angle of normal of used point on the off-axis optical non-spherical mirror and the optical shaft and the aperture height; building mathematical models of non-spherical geometrical parameters and the normal according to a non-spherical formula and derivation; and using a least square method for data processing and solving. By the method and the device, the problem that the off-axis optical non-spherical mirror vertex radius including quadratic coefficient and high order coefficient cannot be measured or measured accurately is solved.

The invention discloses a method for online measuring the linearity of a raceway of a ball linear guide pair. The method includes the steps of measuring the distances between a position and three points on an arc of a raceway section at multiple angles through a laser displacement sensor, deducing space coordinate values of the circle center of the arc of the raceway section through a triangular function relation, measuring space coordinate values of the circle center of the section arc at different axial directions of the raceway multiple times, and fitting the measured circle center with a certain discreteness through a least square method to obtain the linearity of the raceway. By means of the method, the linearity of the raceway is rapidly and accurately measured, the measurement precision depends on the measurement precision of the applied laser displacement sensor, and the error of the measurement precision of the linearity of the raceway can be smaller than 0.1 micron by means of the high-precision laser displacement sensor. When detection is conducted by means of a high-precision transmission working table of a numerical control machine tool, measurement is more accurate.

The invention discloses a power transformer state monitoring method based on fundamental wave zero sequence characteristics. The method comprises the implementation steps that the fundamental wave zero sequence value of three-phase voltage and the fundamental wave zero sequence value of three-phase current of a monitored power transformer are acquired; fuzzy processing is performed through a fuzzy membership function set formed by N fuzzy membership functions to output a set of N fuzzy membership values so as to form the 1xN form of fuzzy state matrix P, wherein each fuzzy membership function is composed of a rectangular function and a triangle function section; and the degree of similarity of two sets of 1xN form of fuzzy state matrixes P and a preset standard state matrix S is calculated, and the standard state corresponding to the most similar standard state matrix is selected to act as the monitoring result of the monitored power transformer to be outputted. The disadvantages of the present transformer power outage verification and online verification method can be compensated so that judgment of the over-error fault of the transformer error can be conveniently and rapidly realized, and safe and stable operation of the power generation, transmission and distribution system and accurate and reliable high voltage electric energy trade settlement can be guaranteed.

The invention relates to a gap evaluation method for a rock rupture crack surface. The gap evaluation method comprises the following steps of: splitting a stratum core into two rocks to acquire two crack surfaces A and B with a corresponding relationship respectively; scanning the corresponding crack surfaces of the two rock cores by a three-dimensional laser scanner respectively to acquire the original three-dimensional geometric data (x, y, z) of the crack surfaces of the two rocks; integrally changing the original three-dimensional geometric data of the crack surface A by virtue of a triangular function relationship, and simulating the ruptures of the crack surface A in different orientations; homotaxially turning over the three-dimensional geometric data of the crack surface A after rupture; accumulating the new three-dimensional geometric data of the crack surface A with the original three-dimensional geometric data of the crack surface B to acquire the quantity of gaps and the distribution condition of the gaps in different coordinate positions in the crack surfaces after rupture. The quantity and the distribution condition of the gaps in the rupture crack surfaces, which are acquired by the method are the same as an actual crack shape, thus greatly improving the accuracy, and meeting the digital simulation researches of mesomechanics well.

The triangular function and plane geometry demonstrator includes one base board with planar rectangular coordinate system and unit circle, one hinging point in the circle center, one angle end side rod with length greater than the diameter of the circle parallel to the base board and in the circle center, two hinging points set symmetrically on the angle end side rod, and two sine line rods separately on the two hinging points with unit length and parallel to the base board. When the angle end side rod is rotated, the demonstrator can show the varying triangular function values and other triangular function contents as well as most of plane geometry diagrams intuitively. The present invention may be used in replacing corresponding static diagram and may be used in relevant teaching.

The invention discloses a spine three-dimensional positioning method and relates to the technical field of minimally invasive surgery. The method includes: acquiring a normal position image and a sideposition image of a spine through X-ray photography; guiding in an X-ray photography image, and determining spatial positions of mark points C and D in each of the normal position image and the sideposition image according to a given scale; respectively marking original point and coordinate system in the normal position image and the side position image; marking related points in the images, andcalculating to generate coordinate values of each point by a system; determining a spatial straight line according to two points, calculating spatial coordinates of the related points and included angles between the straight line determined by the points C and D and a horizontal plane and a vertical plane, and determining puncture position, angle and distance of a puncture needle through a triangular function; according to output parameters, setting position and angle of the puncture needle of a spine puncture locator. By the method, complex calculation process is made quite simple and convenient, and visual puncture line prompting is combined, so that errors caused by calculation are avoided basically.

The invention relates to a posture estimation method of a four-rotor aircraft based on evidence fusion. The method provided by the invention comprises the following steps: establishing a state equation and an observation equation of postures of the four-rotor aircraft, wherein state and observation noises are modeled to be a triangular possibility distribution function; converting the function into noise evidences, and substituting the noise evidences into the state equation and the observation equation, so as to generate three evidences describing states of the aircraft after being compounded with an actual observed value; realizing the evidence fusion by using an evidence combination rule; recursively spreading the three evidences in continuous times through a section mapping tool; weighing reliability assignment included in the fused evidences, so as to obtain an estimated value of the posture of the aircraft. The method provided by the invention has no need of meeting the steep requirements that the probability distribution of the state and observation noises are known, and only needs to define the noise to be bounded and can be described by using the simple triangular function. The practicability in actual posture estimation can be improved. Compared with the existing typical method, the method has higher estimation precision.

The invention provides a rock body side slope downslide block body area analysis method. A polygonal block body sliding down from a side slope has n sides, wherein n is an integer greater than 3; the polygonal block body is decomposed into n-2 triangular units; the coordinates of each apex of the polygonal block body are obtained by using a laser tracker; the area of each triangular unit is calculated rapidly by using a determinant method according to the coordinate values; the area of the polygonal block body can be obtained by summing up the area of the triangular units. When prejudgment analysis is carried out for side slope stability in the field via downslide block bodies, the analysis and calculation method provided by the invention can greatly simplify calculation steps and save calculation time during manual calculation and verification and facilitate teaching and pre-analysis in the field.

The invention discloses a method for calculating a tide-bound water level by using a high tide and a low tide. The method comprises the following steps of: 1) acquiring tide levels and tide time sequences of the high tide and the low tide; 2) calculating ebb tide duration, rising tide duration and a tidal range sequence, and calculating average rising tide duration, average ebb tide duration and high tide levels, low tide levels and tidal ranges of different cumulative frequencies; 3) deducing a characteristic tide level process function of a specific cumulative frequency, and drawing a characteristic tide level process line; and 4) reading the tide-bound water level of a specific time length through a tide level process function or a process line, wherein the water level is the tide-bound water level of the time length guarantee rate. Only high and low tide levels and tide duration data need to be collected, and hour-by-hour data do not need to be collected; the tide-bound water level can be solved by adopting a trigonometric function formula, and the method is simple and easy to implement; the calculation precision is consistent with that of the existing method; meanwhile, the method for solving the tide-bound water level can adapt to sea areas where detailed hourly tide level data are difficult to collect.