89 results about "Cosine curve" patented technology

The invention discloses a graphene based terahertz broadband adjustable wave absorption device, and relates to a wave absorption device. The graphene based terahertz broadband adjustable wave absorption device is of a three-layer structure which comprises a periodic mesh-shaped graphene layer, a dielectric layer and a metal layer from top to bottom, and is characterized in that the horizontal period of a unit structure of the periodic mesh-shaped graphene layer is Px, the longitudinal period of the unit structure is Py, the graphene width has a characteristic of continuous gradual change modulation, the edge of the periodic mesh-shaped graphene layer has a sine curve, a cosine curve, a parabolic curve, an elliptic curve or other curves capable of realizing graphene width gradual change modulation, the maximum width Wmax is consistent with the horizontal period Px, and the minimum width Wmin ranges between 0 and the horizontal period Px; the dielectric layer is made of an insulator such as silicon dioxide, and the thickness td of the dielectric layer is associated with the wave absorption frequency band; and the metal layer is made of a good conductor such as gold or silver, and the thickness tm of the metal layer is greater than the skin depth of incident waves. The graphene based terahertz broadband adjustable wave absorption device can realize broadband strong absorption for terahertz waves, the absorption rate of incident broadband terahertz waves is adjusted on a large scale, and the structure is simple.

The invention relates to a cosine shock wave swing movable teeth transmission device which is characterized in that an input shaft shock wave generator is installed coaxially with an output shaft rack and a central internal gear; the central inner gear is fixedly connected with a machine body base; movable teeth pins are arranged on the output shaft rack; swing movable teeth are sleeved on the movable teeth pins and simultaneously in contact with the tooth profile of the input shaft shock wave generator and the tooth profile of the central internal gear; the tooth profile of the input shaft shock wave generator is a cosine tooth profile in which a cosine curve or an equidistant curve of the cosine curve serves as a profile contour curve and a cosine teeth profile conjugate curve, or the equidistant curve of the cosine curve serves as the profile contour curve. The cosine shock wave swing movable teeth transmission device fundamentally solves a wearing problem of a movable teeth engagement pair, so that the processing technology difficulty is greatly lowered, the size and the accuracy are well guaranteed, the stability in transmission is also guaranteed by the smooth curvature characteristic of a cosine shock wave, and the cosine shock wave swing movable teeth become transmission elements with an excellent transmission performance due to the characteristics.

The invention relates to a method for testing a dynamic lock area of a prismatic laser gyro. The method comprises the following steps: 1) motivating a laser gyro to emit P polarized lights; 2) starting a rotary table to rotate according to a cosine curve equation; 3) aligning a photoelectric receiver at the P polarized lights so as to receive light pulse signals, and then converting the light pulse signals into electrical signals; 4) amplifying the electrical signals; 5) rectifying and filtering the amplified electrical signals, then converting the electrical signals into square signals, and inputting the square signals into a microcontroller; 6) reading the number of pulse in the square signals in real time and acquiring the angular velocity of rotation of the rotary table by the microcontroller, and inputting the obtained related information into an image display device; 7) displaying a relationship chart relating to the number of pulse, the angular velocity of rotation and the time in real time by the image display device; and 8) reading the angular velocity (namely, the value of the dynamic lock area of the detected prismatic laser gyro) of rotation of the rotary table corresponding to the time when the pulse signal in the relationship chart occurs. The method provided by the invention has the advantages of quickly and accurately realizing the detection on the lock areas, rapidly increasing the production efficiency, and facilitating the production application and the quality judgment of a laser resonant cavity.

The invention discloses a cosine curve mechanical seal end surface structure. The structure comprises a movable ring and a static ring of a mechanical seal; the outer ends of the sealing end surfaces of the movable ring and the static ring serve as high-pressure sides, namely upstream, and the inner ends of the sealing end surfaces serve as low-pressure sides, namely downstream; smooth and continuous annular sealing dams are arranged on the low-pressure sides of the sealing end surfaces; multiple periodically distributed curve grooves are formed in the high-pressure sides of the sealing end surfaces; openings at one ends of the curve grooves extend to the upstream of the sealing end surfaces, and the other ends of the curve grooves are positioned at the upstream of the annular dams; micro grooves are symmetrically formed in two sides of each curve groove; and the sealing end surfaces are provided with sealing weirs in non-grooving areas between the curve grooves at the upstream of the annular dams. The cosine curve mechanical seal end surface structure has the following beneficial effects: the structure is obvious in reflux effect, low in leakage rate, capable of being applied to various mediums, high in solid particle preventing capacity, excellent in static / dynamic pressure effect and capable of frequently starting and rotating in two directions.

The invention discloses a hybrid reservoir group flood control optimization scheduling scheme generation method based on an energy criterion. The method comprises the following steps: selecting a hybrid reservoir group and a corresponding downstream protection object; performing particle swarm coding; setting constraint conditions of each reservoir in the series-parallel reservoir group; calculating the fitness value of each particle in the first generation particle swarm; carrying out iterative circulation and updating particles by adopting a particle swarm algorithm based on an attenuation cosine curve inertia weight; and calculating the fitness value of each particle in the new-generation particle swarm until an optimization condition is met, and outputting a flood control optimization scheduling scheme of the hybrid reservoir group. According to the method, the particle swarm optimization algorithm based on the attenuation cosine curve inertia weight is adopted, the defect that an existing particle swarm optimization algorithm is prone to falling into local optimum is overcome, the global and local search capacity is enhanced, the reservoir group flood control optimization scheduling scheme is finally obtained, under the condition that downstream safety is guaranteed, the flow called by a flood control reservoir group is greatly reduced, and the flood control risk is greatly reduced.

The invention provides a real-time curve drawing method which comprises the following steps of: reading sampling time and analog quantity real-time values of sampling points; drawing a curvilinear figure by using the sampling time of the sampling points as abscissas and using the analog quantity real-time values of the sampling points as ordinates; comparing the analog quantity real-time values of a current sampling point and a previous sampling point and then drawing a quarter of period of cosine curve on the curvilinear figure by using the point with the small analog quantity real-time value as an origin of coordinates, using the point with the large analog quantity real-time value as a crest or trough point and using four pieces of sampling time as a period; translating the curvilinear figure forward by one period by using one piece of sampling time as the period, judging whether the sampling points on the curvilinear figure reach the boundary of the curvilinear figure, and if the sampling points on the curvilinear figure reach the boundary of the curvilinear figure, deleting the sampling points from a buffer zone; and entering the next circulation. By the method, a smooth, attractive and real real-time analog quantity curve can be drawn; and the method is simple and practical.

The invention discloses a conjugate gear pair based on a common rack, wherein each single tooth profile of the common rack is formed by a cosine-based composite curve composed of a straight line segment I, a cosine curve I, a straight line segment II and a cosine curve II in a rectangular coordinate system, and the straight line segment I, the cosine curve I, and the straight line segment II and the cosine curve II sequentially meet first-order continuous requirements. Each single conjugate tooth profile, corresponding to each single tooth profile of the common rack, of an inner gear or an outer gear is obtained through the meshing principle, and therefore the conjugate gear pair is formed. The whole conjugate gear pair is formed by the single tooth profiles, which are evenly distributed around the center of the inner gear or the outer gear according to the number of teeth of the inner gear or the outer gear, of the inner gear or the outer gear. According to the conjugate gear pair based on the common rack, through the adjustment of the symmetric factor of the tooth profiles, the non-symmetrical gear pair can be obtained, and therefore the long side in the two tooth sides is more suitable for transmission, the short side is more suitable for being used as a seal when the tooth profiles are used as a pump, the separation of a transmission function and a sealing function is benefited, the transmission performance and the sealing performance are enhanced, and a design method of the conjugate gear pair based on the common rack builds a mathematical model for the multivariate optimization of gear pairs.

An apparatus (11) for estimating internal biological time of a biological individual on the basis of quantity data of a gene product as measured in a specimen sampled from the individual. The apparatus includes circadian oscillatory gene selection means for selecting circadian oscillatory genes whose time-course change in gene product quantity data as measured in standard specimens approximates a cosine curve having a predetermined period; circadian expression curve selection means for selecting, from among a plurality of cosine curves having different phases and sharing a specific period, a circadian expression curve which is similar to the pattern of time-course change in the expression product quantity of each of the above-selected circadian oscillatory genes; and registration means for registering information which identifies the selected circadian expression curve.

The invention relates to an optical three-dimensional measuring method based on a phase coding technology, belonging to the technical field of three-dimensional measurement. The method comprises the following steps of: (1) producing a grating coding stripe image by a computer; (2) projecting the grating coding stripe image by using digital projection equipment; and (3) acquiring the grating coding stripe image and performing coding solution and three-dimensional measurement by adopting a phase-shift algorithm. The method is characterized in that: the number of pixels in each grating period of the grating coding stripe image generated in step (1) is equal to the step number of the adopted phase-shift algorithm; and the gray scale of the pixels in each grating period of the grating coding stripe image is needed to meet sine or cosine curve distribution, and the gray-scale value of the pixels are extreme points of the corresponding sine or cosine function. Compared with the traditional sine phase-shift coding method, the method has strong interference resistance to the nonlinear influence of gamma rays of the digital projection equipment, the coding has higher stability, reliability and correctness, and the method is important in the aspect of accurate measurement of an optical three-dimensional outline on the external surface of an object.

The invention aims to provide a valve cam provided with a cosine-constant speed type buffer section and used for an internal combustion machine and a lift curve determination method of the valve cam.The cosine-constant speed type buffer section is composed of two segments, namely the acceleration curve of the first segment is a cosine curve, and the acceleration curve of the second segment is a constant-speed curve; the expression of the lift curve of the valve cam used for the internal combustion machine is that when 0<=alpha<=alpha1, hC(alpha)=C1(1-cosomega alpha); when alpha1<=alpha<=alpha0, hC(alpha)=E0+E1alpha; and the undetermined constants C1, E0 and E1 of the cosine-constant speed type buffer section are worked out according to the boundary conditions and the continuity conditionat the position where alpha=alpha1, namely C1=h0 / [1+cos(omegaG alpha0)+omega alpha0(1-G)sin(omegaG alpha0)], E1=C1.omega.sin(omegaG alpha0), and E0=h0 / alpha0 E1. According to the valve cam provided with the cosine-constant speed type buffer section and used for the internal combustion machine and the lift curve determination method of the valve cam, the third derivative of the tail end of the buffer section can be kept zero, the discontinuity of the segments of the buffer section can be avoided, and thus impact, vibration and noise, caused by the cam profile, of a valve mechanism can be reduced easily.