43 results about "Triangular function" patented technology

A confirmation device of triangular function value consists of triangular function table storage unit for storing said triangular function table and fixed-point triangular function value, normalization-processing unit for carrying out normalization treatment on fixed-point input angle, digit obtaining unit for obtaining two adjacent bits, triangular function confirmation unit for querying fixed-point triangular function value in triangular table according to two said adjacent bits and normalization treated fixed-point input angle.

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.

A portable communication device equipped with a tripod stand function as well as wide field of view and stereo sound functions. The portable communication device includes: a central shell; a first shell rotatably coupled to the central shell around a first hinge axis in such a way that the first shell can move toward the central shell or away from the central shell; a second shell rotatably around the first hinge axis. The second hinge axis is connected to the center shell in such a way that the second shell can move closer to the center shell and the first shell or away from the center shell and the first shell, the second hinge axis is parallel to the first hinge axis; for supporting the first The supporting unit of the shell and the second shell, thereby maintaining the first shell, the second shell, and the center shell in a three-pillar structure.

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 discloses a construction engineering perpendicularity detection device that is convenient to move, and relates to the technical field of construction engineering detection; in order to solve the problem that the detection instrument will cause a detection error if the guide rod is tilted; the device specifically includes a detection frame and a detection board. The outer walls on both sides of the detection board are respectively provided with chute, and the inner walls of the two chute are respectively slidably connected with a sliding plate, and the outer wall of the two sliding plates away from the support column is welded with the same connecting frame, and the inner wall on one side of the connecting frame is rotatably connected with a The rotating rod is welded with two fixed columns on the outer wall of the rotating rod. In the present invention, a cone is provided, a first distance meter is arranged on the cone, and a second distance meter is arranged on the outer wall of one side of the positioning frame. Under the action of gravity, the rope and the cone will be in a vertical state, and then the second distance meter is started. The first range finder and the second range finder detect the distance from the wall, and the verticality of the wall is confirmed according to the trigonometric function, which can improve the detection accuracy.

The invention discloses a phase-separated calculation method for the error power of a faulty electric energy metering device, which solves the problem that the traditional error power calculation method is greatly affected by load imbalance and the calculation process is cumbersome and complicated. Calculation and trigonometric function conversion are cumbersome, the workload of the metering personnel is heavy, and the error rate is high. The invention relates to a phase-separated calculation method for the fault error quantity of an electric energy metering device, which uses the characteristics of the intelligent electric energy meter to measure data by components and event memory records, etc. Compared with the traditional method, there is no need to consider the influence of three-phase load imbalance and no need to calculate the correction coefficient, which greatly reduces the amount of calculation and improves the error power. Calculated accuracy for all metering device failure types where voltage and current are present.

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 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 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 present disclosure provides a single-stage axial-flow high-pressure compressor comprising a hub having an asymmetric end wall obtained by sweeping a profile line built in a blade channel, the profile line being a non-axisymmetric curve, and constructed using trigonometric functions.