189 results about "Mathematical relation" patented technology

The apparatus for blood flow control in an extracorporeal circuit comprises: a user interface for setting a desired blood flow value (qbREAL) and a datum relating to the vascular access, a memory for recording a plurality of mathematical relations having mathematical expressions relating to the vascular access organ to be used, and a control unit. The control unit identifies the vascular access, selects, from among the plurality of mathematical relations present in the memory, a relation which corresponds to the vascular access identified, and calculates, as a mathematical function of the set value for the desired flow (qbREAL), a value at which to set the angular velocity of the pump associated to the extracorporeal circuit and / or a theoretical value of the arterial pressure upstream of the pump.

The invention provides a distributed photovoltaic automatic generating control method based on sensitivity. The control method includes the following steps: a) solving the mathematical relation of the power distribution network node voltage disturbance amount and node injection active-reactive disturbance amount through the local linearization around the distribution network stable-state operation working points, namely, analyzing the variation relation of the node voltage amplitude and node active-reactive injection through a sensitivity analytical method; b) based on the sensitivity relation of the node voltage and the node injection, selecting a node having the highest voltage sensitivity of the node active-reactive injection to the node voltage threshold-crossing or widely fluctuating nodes in a distribution network as an active-reactive adjusting node to participate in the active-reactive optimization regulation, wherein a photovoltaic power generation system which doesn't participate in the adjustment always works at the largest power tracking state; and c) establishing a distributed photovoltaic optimization model by taking the distribution network distributed photovoltaic output maximization and node voltage rated value deviation minimization as the target and taking the active-reactive output value of the active-reactive adjusting node as a solving variable.

A servo control device for a disk drive capable of effectively compensating for a low frequency disturbance incoming to the disk drive is provided. The servo control device includes: a state variable estimator calculating a position estimation error based on a control input for controlling motion of a head and a position error signal by using a predetermined state equation; an estimation filter calculating a disturbance estimation value from the position estimation error by using a mathematical relation between a disturbance and the position estimation error; and a subtractor subtracting the disturbance estimation value from the control input.

Some embodiments provide a method for locking in a mathematical relationship between a set of at least two parameters in a computer program. The method selects a first parameter. The method defines a mathematical relationship that ties the value of the first parameter to the value of a second parameter. In some embodiments, the mathematical relationship can be a mathematical function, a Boolean function, or a lookup table. The relationship could be directly entered by the user, or the computer program itself could derive it from the user's actions. In some embodiments, the first parameter can be locked to the mathematical relationship. The lock prevents the value of that parameter from being changed, except by changing the value of the second parameter. Some embodiments implement this method by using a GUI with an intuitive set of controls.

The invention discloses a transient throttle's variable working condition driving index identification algorithm under steady speed driving, comprising: establishing transient throttle's variable working condition testing norms; acquiring the vehicle performance parameters such as the throttle opening degree, the acceleration speed, the vehicle angle, the time, the motor rotation speed and the gear information through a signal acquisition device; performing multi-source vehicle performance parameters fusion and discretization determining to obtain the segment of the smallest working unit and determining the characteristic value; obtaining all the evaluation indexes of the transient throttle's under the steady speed driving; and then establishing a mathematical relation model of the evaluation indexes and the evaluation index scores through the index characteristics. The present invention provides a method for identifying the evaluation indexes and index scores from the vehicle performance parameters for the objective evaluation of driving.

The invention discloses a CA double-swing-head five-axis numerical control machine tool swing head position error detection and identification method. The method comprises the steps: S1, using a detection instrument for measuring the comprehensive position deviation of the ball center of a ball head detection baseball at different positions of a swing head; S2, establishing a mathematical relationbetween the ball head baseball center position deviation and the position error term in combination with the property of a swing head position error term according to the kinematic model of the CA double-swing-head five-axis machine tool; S3, obtaining nine position error identification results of the swing head through an identification process based on the measurement data collected in the stepS1 and the kinematics error relational expression in the step S2; and S4, repeating the step S1 and the step S3, carrying out measurement for multiple times, and taking an average value of a positionerror identification result. According to the scheme, separation of the comprehensive position deviation value of the machine tool swing head can be effectively and rapidly completed, automatic detection and automatic identification are achieved by compiling a measurement cycle, and thus technical support is provided for accurate control and rapid evaluation of machine tool precision.

The invention discloses a system and a method for measuring the centre position and the exradius of a ring by utilizing snubber rolls. The system for measuring the centre position and the exradius of the ring by utilizing the snubber rolls comprises the ring. One side of the ring is symmetrically provided with a snubber roll I and a snubber roll II which are contacted with the outer wall of the ring; the two snubber rolls are respectively connected with corresponding oil cylinder II and oil cylinder II through respective snubber arm I and snubber arm II; corresponding displacement sensors arerespectively arranged in the two oil cylinders; the inner wall of the ring is provided with core rolls contacted with each other; and the outer wall of the ring is contacted with a main roll. According to the method for measuring the centre position and the exradius of the ring by utilizing the snubber rolls, a mathematical relation between the centre position and the exradius of the ring and thestrokes of the two oil cylinders is derived through establishing a system of rectangular coordinates. The strokes of the two oil cylinders, which are measured by the displacement sensors arranged in the oil cylinders, are substituted into calculation software, and thus, the numerical values of the instant centre position and the exradius of the ring can be obtained, and simultaneously, whether the ring deviates or not and the offset when the ring deviates can be discovered according to the centre position, and the out of roundness of the external diameter of ring can also be detected. By applying the method, a measuring roll system of a traditional ring rolling machine can be removed, the method is easy to implement, the cost is reduced, and the precision is higher.

The invention relates to an oil paper insulation micro-water content evaluation method utilizing mixed polarization model parameters. The method comprises the following steps: firstly, solving a mixed polarization model parameter insulation resistance Rg based on a plurality of groups of FDS test data of oil paper insulation test articles with different micro-water contents; analyzing a change rule of the Rg along with the micro-water content, fitting a mathematical relation between the Rg and the micro-water content, and finally verifying the effectiveness and feasibility of the mathematical relation through examples, thereby providing the oil paper insulation micro-water content evaluation method utilizing the mixed polarization model insulation resistance.

The invention discloses an energy saving amount determination method and device for a heating energy-saving reconstruction project. The method comprises the steps that first, mathematical relationships between energy consumption accumulation values and indoor and outdoor temperature difference time number accumulation values in a whole heating period before and after project reconstruction are determined respectively; an ideal indoor and outdoor temperature difference time number accumulation value under an ideal condition in a heating period is determined; and finally, the energy saving amount in the heating period is calculated according to the two mathematical relationships determined before and after project reconstruction and the ideal indoor and outdoor temperature difference time number accumulation value. According to the method and the device, the heating energy consumptions before and after energy saving reconstruction are corrected to the same ideal condition, then the period energy saving amount is calculated according to the heating energy consumption correction value before and after reconstruction, and therefore the problem that the result error of the period energysaving amount is large due to the fact that the outdoor temperatures before and after energy saving reconstruction are different, or the heating quality is substandard can be avoided.

The invention relates to maximal posterior probability decoding and 3D block matching filtering based video de-noising method. A video is received and obtained via a prior knowledge enhanced mobile video broadcast transmission system. The de-noising method comprises the following steps that S1) a received video signal is converted into an estimated mathematical relation of the minimum mean squarederror of noise and the video signal via a space vector threshold, a maximal posterior probability decoding method is used to obtain an estimated value of the video signal, and the video signal from which part of Gaussian noise is removed is obtained; and S2) 3D block matching filtering is carried out on the video signal obtained in the step S1 to eliminate Gaussian noise further, and a final de-noised video is obtained. Compared with the prior art, the peak signal to noise ratio is higher, a better visual experience can be obtained subjectively, detail part of the video image can be remainedin a battery way, and smooth filtering is realized.

The invention discloses a laser cleaning process monitoring method based on an acoustic emission technology. A monitoring system is composed of a near-infrared nanosecond optical fiber laser processing system, a data acquisition card, preamplifiers, a signal cable and acoustic emission sensors. According to the principle of the laser cleaning process monitoring method, the cleaning effect is subjected to real-time and non-destructive monitoring based on the laser cleaning process of the acoustic emission technology; a mutual mathematical relation between the cleaning effect (the quantity of residual rust materials on the surfaces of workpieces) and the amplitude of acoustic emission signals is obtained, setting of laser processing parameters is controlled in real time, and thus laser cleaning is subjected to online and non-destructive monitoring; besides, the acoustic emission sensors are directly arranged on the surfaces of rust layers of the workpieces, the interference of other signals is reduced, and the reliability of the collected acoustic emission signals is improved. According to the monitoring system and method, the structure and use are very simple and reasonable, the precision is high, the performance is stable, the problem that an existing laser cleaning technology does not have a real-time detection function is solved, and the cleaning quality and efficiency are improved.