211 results about "Maximum deviation" patented technology

The present invention relates to the definition, in a flight plan, of the horizontal profile of an air route with vertical flight and speed profile prescribed on departure and/or on arrival, by a stringing together of check-points and/or turn points associated with local flight constraints and called “D-Fix” because they are not listed in a published navigation database like those called “Waypoints”. It consists in charting, on curvilinear distance maps, a direct curvilinear path joining the departure point to the destination point of the air route while complying with vertical flight and speed profiles prescribed on departure and/or on arrival and while guaranteeing a circumnavigation of the surrounding reliefs and compliance with regulated overfly zones, then in approximating the series of points of the direct curvilinear path by a sequence of straight segments complying with an arbitrary maximum deviation threshold relative to the points of the series and an arbitrary minimum lateral deviation threshold relative to the set of obstacles to be circumnavigated and in adopting as “D-Fix” points the points of the intermediate intersections of the rectilinear segments.

The invention provides an electric automobile power battery equalization management system and method. Battery cells of a battery pack of the electric automobile power battery equalization management system are connected in series and sequentially divided into M identical battery modules. All the battery modules are connected with corresponding resistor equalization circuits and capacitor equalization circuits as well as a coaxial multi-winding DC-DC converter. A microcontroller is connected with a battery management system so as to acquire battery pack status data. Signals of the microcontroller are connected with all the resistor equalization circuits and the capacitor equalization circuits and further connected with a pulse drive unit and a converter. According to the equalization management method, the microcontroller first acquires nominal parameters of the battery pack, so that control parameters are determined; then, the microcontroller acquires current operation variables, so that the maximum deviation and the dispersion degree of voltage of the battery modules are calculated; according to different states of the battery pack, namely charging, quiescence and discharging, different judgment standards for starting equalization are selected, the converter is used for equalization between the modules, the resistor equalization circuits and the capacitor equalization circuits are used for equalization between the battery cells. According to the electric automobile power battery equalization management system and method, advantages of various equalization circuits are complementary to one another, so that equalization speed is increased, and equalization efficiency is improved.

A longitudinal plunging unit (11) for torque transmitting purposes in a shaft assembly, comprising an outer profiled sleeve (21) having circumferentially distributed, inner, longitudinally extending first ball grooves (22) to be connected to a first attachment part, a profiled journal (31) positioned inside the outer profiled sleeve (21) and having circumferentially distributed, outer, longitudinally extending second ball grooves (32) to be connected to a second attachment part, groups of balls (41) arranged in pairs of first and second ball grooves (22, 32), and a sleeve-shaped ball cage (42) which is positioned in the annular space between the profiled sleeve (21) and the profiled journal (31) and which fixes the groups of balls (41) in their respective positions relative to one another. The profiled journal (31) is a hollow journal comprising a material with a substantially uniform wall thickness with a maximum deviation of ±15%.

Disclosed are a method and system for measuring concentricity and the tip clearance of a rotor and a stator of an aero-engine. The method comprises the steps that the clearance amount of the rotor and the stator of the aero-engine at an initial measurement point is acquired; a clearance maximum jerk value FIR value, the phase of the clearance maximum jerk value FIR value, a maximum deviation IMP value between a sampling profile curve concave point and a mean profile, the phase of the maximum deviation IMP value, an eccentric distance ECC value, the phase of the eccentric distance ECC value, a maximum clearance value relative to the rotation center, the phase of the maximum clearance value, a minimum clearance value relative to the rotation center, the phase of the minimum clearance value, a maximum clearance value relative to the geometric center, the phase of the maximum clearance value, a minimum clearance value relative to the geometric center and the phase of the minimum clearance value are obtained; an angle-clearance distribution diagram is drawn; the clearance amount is corrected in the horizontal placement measurement process; a concentricity error value and the tip clearance of the rotor and the stator of the aero-engine are obtained. The system comprises a sampled data analysis module, a rotor and stator concentricity calculation module, a tip clearance analysis and calculation module and a horizontal-measurement deflection correction module. The method and system are suitable for measuring the concentricity and the tip clearance of the rotor and the stator of the aero-engine.

The invention relates to a method of realizing interpolation control to the tool path in an NC machine tool system, which includes that: the processed shape is described with Nurbs curves; the Nurbs curve are discretized to form location point range under the condition of meeting the demand of predetermined precision; each point of the location point range is subjected to velocity planning to obtain corresponding speed under the condition of meeting the demand of predetermined acceleration and precision; the interpolation sequences are formed according to the location point range and the corresponding speed of each point; the tool path control signals are produced according to the interpolation sequences and then sent to the power device of the NC machine tool. By adopting the method of realizing interpolation control to the tool path in the NC machine tool system, the invention ensures that the maximum deviation of tool path does not exceed the acceptable scope during processing under the condition of meeting the demand of location precision and acceleration, and the operation speed of each point can be constrained effectively; the invention has quick and efficient process, simple and rapid operation, stable and reliable working performance, and wide application, and lays a solid foundation for the further development of control technology of the NC machine tool.

The invention discloses a method for testing the performance of a seeker. The method for testing the performance of the seeker comprises the steps that S1, the seeker is powered on; S2, a light source is controlled to make pitching and rotating movement around a horizontal rotary shaft, and/or the light source is controlled to make horizontal rotating movement around a vertical rotary shaft; S3, the performance of the seeker is tested; and S4, a test report is output. The step S3 comprises at least one of testing of the maximum tracking speed of the seeker, testing of the instant view field angle of the seeker, testing of the zero-position maximum deviation of the line-of-sight rate, testing of the maximum fluctuation of the output noise of the seeker, testing of the searching cycle of the seeker, testing of the frame angle accuracy, testing of the prefabricated frame angle, testing of the searching strategy of the seeker and testing of the sensitivity of the seeker. According to the method for testing the performance of the seeker, the problem that according to a method for testing the performance of the seeker in the prior art, the dynamic object tracking and capturing performance of the seeker cannot be tested can be solved.

The invention discloses an adjustment and control method for the synchronism of guide vanes of a large-scale water turbine, comprising the following steps: the resistance value of a drive coil of a servomotor is measured and then accurately defined in a single guide vane controller; the zero position and the full scale of a single guide vane instruction of the single guide vane controller are adjusted; a guide vane in the single guide vane controller synchronously controls adjustment of the zero position and the full scale of the instruction; the zero position and the full scale of a guide vane opening displacement sensor are adjusted; the vane mechanical bias voltage is measured and adjusted; the control parameter of the single guide vane is set; the synchronous control parameter of the guide vane is set; the starting time and the closing time of the guide vane are measured and adjusted; a single guide vane displacement transmitter gives a failure alarm; a single guide vane control loop gives an alarm; and an overall guide vane control loop gives an alarm. The adjustment and control method improves the control precision of guide vanes of a hydropower generating unit; the deviation of the opening instruction and the feedback is small; the action synchronism of the guide vane is good; both the starting time and the closing time of the guide vane meet the design requirements; the maximum deviation of the switching time is better than that of the standard requirement.

The invention relates to a determination method for an initial well deviation azimuth angle of a three-dimensional horizontal well borehole trajectory and belongs to the technical field of petroleum natural gas drilling. The determination method comprises the following steps: determining a final target-entering deviation angle and a well deviation azimuth angle according to parameters of a target point A and a target point B; determining a minimum stable deviation section length and a well deviation angle behind a twisting direction by using a vertical depth error of the target point A; determining a deviation change rate of a deviation change tool according to a deviation change capability of a drilling tool needing to be used; determining a borehole curve rate needed by a needed entering sleeve according to a sleeve type needing to be adopted; predicating a natural deviation change rate of a stratum according to adjoining well data; determining a first two-dimensional deviation increasing section maximum well deviation rate and a three-dimensional deviation increasing and twisting direction finishing point maximum deviation increasing rate; and combining the parameters to determine the initial well deviation azimuth angle of the three-dimensional horizontal well borehole trajectory. The quantified design is realized, and field drilling and oriented construction are convenient to realize; the oriented working amount is reduced and the drilling engineering cost is reduced.

The invention discloses a main PG balance adjustment method for a distributed storage system, Devices and media, the method presets a desired number of primary PGs for each OSD, the initial value of the weight value of the expected deviation and the primary PG affinity, and then determining whether to adjust the weight value of the current primary PG affinity of the OSD according to the relationship between the absolute difference between the current primary PG number of each OSD and the expected primary PG number and the expected deviation, The primary PG number distribution on each OSD is adjusted by adjusting the weight value of the current primary PG affinity until the weight value of the current primary PG affinity for each OSD does not need to be adjusted. Therefore, compared with the prior art method of randomly distributing the main PG number on each OSD, the method applied to each OSD can gradually approach the expected main PG number, and the maximum deviation is the expecteddeviation, thereby realizing the equalization adjustment of the main PG.

The invention discloses a method and device for generating an alarm threshold value and a method and device for monitoring a service performance index. The method for generating the alarm threshold value comprises: forming a upper threshold value sample space with sample values greater than a predicted basic value and forming a lower threshold value sample space with sample values less than the predicted basic value on the basis of symmetric threshold values by using an asymmetric threshold value concept and using the predicted basic value as a reference; and according to the distribution of a sample with maximum degrees of deviation, performing secondary threshold value computation on the sample space without a maximum deviation sample so as to break a symmetric distribution characteristic of original dynamic threshold values and obtain a more reasonable alarm threshold value range. As a result, when being used for monitoring service performance, the method improves alarm accuracy and monitoring effectiveness and timely and effectively monitors a performance index abrupt change.

The invention relates to a method of automatically managing the flight of an aircraft in turbulent air comprising notably the determination of the current speed (V_c), of an optimal turbulence speed (V_t), of a current thrust value (P). The data relating to a turbulence is acquired. An optimal turbulence speed is determined. Measuring a deviation (Δ) between the current speed (V_c) and the turbulence speed (V_t). Comparing the deviation (Δ) and a maximum deviation value (Δ_max). Iterating k times of the previous three steps, to determine whether the deviation (Δ) is greater than the maximum deviation (Δ_max) for the k^th consecutive time, and the readjustment of the current thrust (P) so as to reduce the deviation (Δ) to a value less than that of the maximum deviation (Δ_max) and to make the current speed (V_c) converge to the turbulence speed (V_t).

The invention discloses an optical axis calibration gauge, system and method. The optical axis calibration gauge comprises a gauge body, wherein a round through hole is formed in the gauge body; the through hole is a straight hole of which the two end faces are parallel; the length L of the through hole is h/tan theta, wherein h is the length of one pixel of a calibrated camera, and theta is the maximum deviation angle value of the gauge. The optical axis calibration gauge can limit the deviation within the precision range required by tested products, the calibration precision requirement is met, the calibration precision of the calibration gauge is not too large, the calculated amount for calibration is reduced, the structure is simple, and the cost of optical axis calibration equipment is lowered greatly.

The invention discloses a method for computing the maximum access capacity of distributed power sources on the basis of expansion second-order cone programming. The method includes inputting related information of power distribution networks and setting the computational accuracy and the maximum number of iteration of the maximum deviation of cone relaxation; judging whether the numbers of iteration exceed the maximum number of iteration or not; taking the maximum access capacity of the distributed power sources in systems into account according to the related information of the power distribution networks and building models for computing the maximum access capacity of the distributed power sources; converting the models for computing the maximum access capacity of the distributed power sources into second-order cone programming models according to standard forms of second-order cone programming; carrying out computation and solution by the aid of mathematical solvers for solving second-order cone programming, outputting solution results and judging whether the maximum deviation of cone relaxation meets given accuracy requirements or not; adding cutting plane constraints on the basis of the second-order cone programming models and integrally forming expansion second-order cone programming models. The method has the advantages that complicated nonlinear programming problems can be solved, tedious iteration and large quantities of tests can be omitted, and the optimal access schemes for the distributed power sources can be quickly obtained.

The invention discloses a starting ignition oil supplying method of an aviation gas turbine engine. The starting ignition oil supplying method is characterized in that a gradual oil supplying mode is adopted for ignition of a combustion chamber in a starting process: firstly, at the moment that an oil supplying condition is met in a process of starting the engine, a control system supplies oil according to the initial ignition oil quantity; the initial ignition oil quantity is as follows: the maximum oil supply deviation value of the control system is subtracted on the basis of the lean oil ignition boundary oil quantity of the combustion chamber of the engine; then the control system carries out the gradual oil supply according to the oil quantity rising slope, and the ignition oil quantity rising slope is the difference between the lean oil combustible oil quantity boundary and the rich oil combustible oil quantity boundary of the engine, and relates to the oil supply maximum deviation value of the control system and a ratio of the oil supply maximum deviation value to the theoretical specified ignition time. The starting ignition oil supplying method has the advantages that the defect of depending on oil quantity control and measuring precision in starting ignition oil supply according to an oil-gas ratio in the prior art is overcome, and the reliable ignition of the combustion chamber in ground and air starting processes of the engine can be ensured.

An improved automatic frequency compensation (AFC) technique and apparatus is provided for piconet applications, e.g., BLUETOOTH(TM) applications. In particular, the present invention provides an offset normalizer which normalizes frequency offset against maximum deviations. By normalizing the frequency offset, before determination of an adjustment of a local oscillator, the local oscillator adjustment becomes uncorrelated with respect to gain along the receiving path (including in a demodulator). Thus, extremely precise adjustments can be made to the local oscillator in a piconet device to provide extremely precise automatic frequency compensation.

The invention provides a used part remanufacturing evaluation system and method. The system comprises a recycling module, a disassembling module, a cleaning module, a detection module and an evaluation module. The remanufacturability of the used parts is evaluated by starting from the remanufacturing product life cycle, and an evaluation indication set is accordingly established and the relevant satisfaction about the evaluation indicators is collected by using the KJ method and an importance comparison matrix between the indicators is established. The maximum deviation analysis method is introduced to the fuzzy extension analytic hierarchy process so that the weight of each indicator can be effectively calculated and the subjectivity of the expert scoring process can be reduced. The indicators are scientifically ordered by the calculated comprehensive evaluation value of the indicators and the remanufacturability of the used parts is evaluated. The corresponding decision is made according to the evaluation result. The remanufacturing process can be simplified by the integrated and comprehensive indicator evaluation system so that the remanufacturing process efficiency can be greatly enhanced.

A plate utilizable in a noise protection wall of fragile acrylic glass comprising a plurality of side by side synthetic monofilament plastic threads for embedded in and running along the plate for splinter binding on breakage of the glass wherein, at least one thread has a maximum deviation of 1 mm or more from a theoretical straight line connecting the ends of said thread.

The invention relates to a CCD test technology and discloses a modulation transfer function test method of a multichannel CCD. The modulation transfer function test method of the multichannel CCD solves the problem that an existing multichannel CCD is not accurate in test result as responses of channels are not consistent. A high-stability light source is adopted, and output of the light source is adjusted to enable the grey value of a reference white board to be 80% of the maximum output DN grey value when the gain and bias are zero; that four pixel grey values of adjacent channels in the reference white board of a target are the closest serves as the standard, and the bias and gain parameters of the channels are adjusted; the best modulation transfer function is searched for through micro movement of a rotary table, and the pixel range of an effective test result of the modulation transfer function is limited strictly according to the position of the target; the rotary table is adopted to move a camera, the target image moves by one pixel position, and the maximum modulation transfer function and the maximum deviation value are counted through the image obtained before and after the image is moved. The modulation transfer function test method of the multichannel CCD reduces difficulty of matching of the target image and the CCD and influence on the test result of the modulation transfer function from fluctuation of a power source.

The invention provides a soft open point (SOP)-based active power distribution network feeder load balancing method. The method comprises: inputting related information of a power distribution network, and setting cone relaxation maximum deviation computational accuracy and maximum iterative times; judging whether the iterative times exceeds the maximum iterative times; building an active power distribution network feeder load balancing model according to the related information of the power distribution network; converting the active power distribution network feeder load balancing model into a second-order cone programming (SOCP) model according to an SOCP standard form; computing and solving by utilizing a mathematical solver for solving SOCP, judging whether the cone relaxation maximum deviation meets given accuracy requirements, and outputting solving results; and adding cutting plane constraints on the basis of the obtained SOCP model, and then integrally forming a strengthened SOCP (S-SOCP) model. According to the SOP-based active power distribution network feeder load balancing method, a complex nonlinear programming problem is solved, complicated iterations and a lot of tests are avoided, computation speed is relatively largely increased, and an optimal active power distribution network feeder load balancing scheme can be quickly obtained.

The invention discloses a starting method of a small-radius curve tunnel. The starting method of the small-radius curve tunnel includes the following steps that the angle between a shield tunneling machine and the normal of a tunnel entrance and the maximum deviation position of the central line of the shield tunneling machine and a designed tunnel are determined through calculation and fitting, before the maximum deviation position, a duct piece on the shield tunneling machine is installed in a half ring mode, and after exceeding the maximum deviation position, the duct piece on the shield tunneling machine is installed in a full ring mode; an annular plate is installed on the upper half part of the first duct piece installed in the full ring mode. Through the structure form combining half-ring duct pieces and a steel support, the problem that starting turning is difficult for a curved tunnel shield is solved, and discharging supply in the tunneling process is facilitated. The starting method of the small-radius curve tunnel does not need a counter-force frame, the duct pieces directly act on a rear hole duct piece serving as the counter-force frame, the space between the duct pieces and the rear hole duct piece is filled compactly through a steel plate, the steel pipe support acts on a starting well ground connecting wall, work efficiency is improved, and the starting method is suitable for a small shield work surface.

The invention provides a data mining method for detecting an abnormal data interval. The method comprises the steps that before data mining is performed on target data, the interval width and the stepping length need to be determined; when data mining is performed on the target data, the target data are traversed in an interval-stepping mode, the maximum deviation amount of the target data is obtained dynamically step by step, the deviation rate of the current data interval is determined, and the deviation rate of the current data interval is compared with a rated deviation rate; when the deviation rate of the current data interval is larger than the rated deviation rate, abnormal data points and abnormal data intervals in the current data interval are determined; after all the target data are traversed, all the abnormal data points, the abnormal data intervals and the overall maximum and minimum values of the target data are obtained, and the abnormal intervals in the target data can be accurately and rapidly detected.

The invention provides a frequency modulation evaluation method of a multipoint energy-accumulation coordinated distributed power supply, and the method is suitable for regulation competence evaluation methods of power distribution network frequency fluctuation caused by coordinated area distributed power supply power fluctuation in a multipoint energy-accumulation disperse access power distribution network. The load deviation and the distributed type power supply power deviation of a regional power grid are calculated, firstly the net load maximum deviation of the regional power grid is predicated and calculated on the basis of the load and the super short period power of the distributed type power supply, then the multipoint energy-accumulation regulation volume bounds and the power regulation rate limit value and power exchange capacity limit values of the regional power grid and an external power grid are calculated, and finally the frequency modulation capacity sufficient degree of the regional power grid is calculated, namely regional power grid frequency modulation capacity evaluation result. According to the frequency modulation evaluation method of the multipoint energy-accumulation coordinated distributed power supply, the frequency modulation support capacity of the multipoint energy-accumulation to the regional power grid can be effectively and accurately evaluated,and further the abundant degree of the the frequency modulation usable regulation volume of the regional power grid is further evaluated.

The invention finds a method capable of simultaneously finishing LC/MS or LC signal base line correction, peak position distinguish and peak position alignment. The invention mainly comprises the following steps: step 1, correcting a metabolic spectrum base line and distinguishing peak position, wherein the main process comprises: 1, within the range of 1-12 feet, taking the Mexican hat function as a mother wavelet, and carrying out continuous wavelet transform (CWT) of which the step length is 1 to each mass spectrum signal; 2, at each time point, detecting the maximum value of the wavelet transform of each mass spectrum signal on each scale to obtain a new signal of which the horizontal coordinate is time and the vertical coordinate is the maximum value of the wavelet transform; and step 2, aligning the peak position. A threshold value (the maximum deviation of the peak position of the same component in different samples) is given, the peak of the deviation in the wavelet transform signal in each sample within the threshold value is incorporated into the same peak, and the corresponding peak position in each sample is modified.

The invention discloses a leveling control method of a finishing mill. The transmission side and the operation side below a looper roll are respectively provided with a tension meter in advance, and the tension meters are used for respectively measuring tensions of strip steel at the transmission side and the operation side. When leveling control needs to be carried out, the method comprises the steps of: A, calculating a center line maximum deviation and a center line actual deviation, if the center line actual deviation is more than the center line maximum deviation, executing the step B, and if not, ending the process; B, calculating the convexity angle of the strip steel in the current position, calculating the leveling value of a unilateral wave according to the convexity angle, the center line maximum deviation and the center line actual deviation; and C, carrying out leveling control by adopting the leveling value of the unilateral wave. By adopting the method, the labor intensity of operators can be reduced and the leveling precision is improved.