34results about How to "Meet different precision requirements" patented technology

The invention relates to an event trigger state estimating system based on markovian jumping. The system comprises a sensor sampling unit comprising a vehicle-mounted sensor used for collecting vehicle suspension system state information, an event trigger unit comprising an event trigger detector used for receiving measured data of the vehicle-mounted sensor on the basis of a periodic event trigger mechanism, a quantizer quantification unit comprising multiple communication links connected with the event trigger detector, connected with one another in parallel and each provided with a logarithmic quantizer, and an estimator network unit comprising estimators connected with the logarithmic quantizers on the communication links respectively used for conducting information transmission through a network. Compared with the prior art, the event trigger state estimating system based on markovian jumping has the advantages that parameters are easy to determine, the object estimating requirements are simple, network blocking is prevented, design is flexible, network resources are saved, external interference is resisted, and the like.

The invention discloses a method of analyzing structural reliability of an aeroengine turbine disc; a random variable mathematical model is established according to non-uniformity of turbine disc material, and a stress analysis model is established according to stress condition; PDS (probabilistic design system) in ANSYS environment is used to perform Monte Carlo sampling on random variables of a turbine disc three-dimensional model to obtain maximum stress MAXSTRESS distribution of the turbine disc under different conditions; Monte Carlo simulation tests of different levels are performed on the random variables on MATLAB (matrix laboratory) platform, and reliability of the turbine disc is calculated according to structural functions to obtain the structural reliability of the turbine disc under different conditions; sensitivity of the random variables influencing the structural reliability of the turbine disc is calculated according to sensitivity equation. The method has the advantages of high convergence speed, low cost and high precision, and theoretical basis is provided for the optimal design and reliability management for a turbine disc.

The invention relates to an aircraft infrared texture image generation method. The method comprises the following steps: Firstly, an aircraft skin three-dimensional model is established; obtaining aircraft skin temperature field data; a three-dimensional temperature model is generated, then the three-dimensional white board model is exported, mapping processing operation is carried out on the three-dimensional white board model, generating a color coding model, screenshot comparison on the three-dimensional temperature model and the color coding model, and filling the temperature data of the corresponding position point is filled into a color coding table to obtain an aircraft temperature texture image; And optical characteristic data of the aircraft is acquired, and the optical characteristic data is added into the aircraft temperature texture image to generate an aircraft infrared texture image. According to the method, the temperature is extracted point by point by using the color coding table, and the position and direction of the virtual camera are adjustable, and the size and precision of the color coding table are adjustable, so that different precision requirements can be met in the temperature extraction process, and the obtained result is very accurate when the parameter setting is appropriate.

The invention relates to an image processing technology, and discloses a statistical method of an image histogram and a system thereof. In the method and the system, identical continuous pixels are compressed in advance by means of run length encoding according to the characteristic that the identical continuous pixels exist in original image pixel data, histogram statistics of the identical continuous pixels can be finished in every operation, and the reading and writing operation steps of histogram statistics are reduced, so that the time and power consumption of histogram statistics are reduced greatly. Moreover, run length encoding is performed during acquisition of the original image pixel data, so that idle resources of a system can be utilized fully.

The invention discloses a security inspection method based on terahertz waves. The method comprises the following steps: a detection device transmits a terahertz wave beam to a human body to be inspected; the detection device receives the terahertz reflected wave of the human body to be inspected; the distance between the current reflection point of the human body to be inspected and the detectiondevice is calculated by using the terahertz reflected wave; the detection device is moved to different positions and the above steps are repeated so as to continuously measure the distance value between different reflection points of the human body to be detected and the detection device; the variation difference of a currently measured distance value relative to the distance value of an adjacentreflection point is judged in real time; if the variation difference exceeds a threshold value, it is judged that there is an abrupt change, namely, the abnormity, at the position. The invention alsodiscloses a security inspection device based on terahertz waves. The invention reduces the complexity of security inspection algorithms and security inspection devices, reduces the application cost,and simultaneously improves the scanning efficiency and the scanning speed.

The invention discloses a multi-column linear electronic multi-head weigher which comprises at least two columns of multi-head electronic weighing devices arranged in the width direction of a conveying belt. Each column of multi-head electronic weighing devices comprises at least two electronic weighing submodules and material collecting hoppers, wherein the at least two electronic weighing submodules are sequentially arranged in the moving direction of the conveying belt; the material collecting hoppers are arranged below the electronic weighing submodules, and the open ends of the material collecting hoppers are connected with discharging ports of all the electronic weighing submodules. The multi-column linear electronic multi-head weigher can be made to be provided with M heads, and different precision requirements of different products can be met completely; N target quantitative values - multiple columns can be weighed simultaneously, the requirements of various production lines can be met completely, and linear arrangement intervals can meet the product requirements of the production lines.

The invention provides a multifunctional high-precision weighing system based on a virtual technology. The multifunctional high-precision weighing system is formed in such a way that an instrument amplifier and an amplifier are used to carry out two-stage amplification on a weak signal outputted by a constant section cantalever type sensor, an analog-to-digital converter is controlled by a singlechip to perform analog-digital conversion on the amplified signal, meanwhile, a serial port communication level translator is used to conduct the level conversion on acquired data and then sends the acquired data subjected to the level conversion to a computer through a serial port, and functions of password authentifying, unit price setting, data processing, displaying, storing, transmitting and controlling are achieved through LABVIEW software.

The invention discloses a precision-adjustable water level measuring device which comprises a base provided with a three-dimensional displacement system, a long-distance detection head is movably fixed on the three-dimensional displacement system, the long-distance detection head is communicated with an adjustable reading table, and the adjustable reading table is detachably fixed on the base; the adjustable reading table comprises a bottom plate and an inclined table top provided with a ruler, a U-shaped gas-liquid difference measuring tube is detachably fixed on the inclined table top, and the two ends of the U-shaped gas-liquid difference measuring tube are communicated with the remote detection head and the reference water tank respectively; a supporting rod for adjusting the included angle between the inclined table top and the bottom plate is arranged on the inclined table top; and a reading adjusting device is arranged on the U-shaped gas-liquid difference measuring tube. By adjusting the measurement precision, the device can meet different precision requirements of various scenes on model indexes. The invention further discloses a water level measuring method which comprises the steps of determining a measuring original point, calculating coordinates of a point to be measured, adjusting precision and measuring water level data of the point to be measured.

The invention discloses a high-precision gas mass flow control valve. A PLC controls a servo motor driver to serve as a power source; a servo motor rotates correspondingly after receiving a signal; arotating shaft of the servo motor drives a valve element to move axially through a lead screw and a limiting nut, then the opening-closing degree of the valve element and a valve seat is controlled, and finally the gas flow is controlled; a gas flow meter and a pressure sensor are connected to a gas inlet of a valve body; a flow signal output by the gas flow meter and a pressure signal detected bythe pressure sensor serve as feedback signals, the PLC receives the feedback signals and then compares the feedback signals with a system instruction, makes a judgment, and sends a new instruction tothe servo motor, and therefore flow and pressure closed-loop control is formed; and finally, closed-loop control over the position of the valve element reaches high-precision flow control.

The invention discloses a water total hardness test solution for aquaculture and aquarium as well as a preparation method and a use method of the test solution. Every 1,000 ml of the test solution contains 3.13-6.25 g of ethylenediamine tetraacetic acid (EDTA), 15-30 g of ammonium chloride (NH4Cl), 100-200 ml of strong ammonia water with the mass percent concentration of 25%-28%, 1-4 g of chrome black T and the balance of pure water. The reagent is easy to prepare, convenient to use and relatively small in measurement error, can be used for determining the hardness of a water body without a formula or a colorimetric plate, and is suitable for aquaculture and aquarium industries.

The invention discloses an anti-aging drawer structure, a control method thereof and a refrigerator. The anti-aging drawer structure comprises a drawer body, wherein an ultraviolet illumination assembly is arranged in the drawer body, an illumination adjusting module is further arranged in the drawer body, and the illumination adjusting module comprises a detection unit and a control unit; the detection unit is used for detecting the projection area of objects placed in the drawer on a drawer bottom plate; and the control unit is used for controlling the illumination intensity or the irradiation area of the ultraviolet illumination assembly according to the size of the projection area. According to the anti-aging drawer structure, the control method thereof and the refrigerator, through the arrangement, after the objects are placed in the drawer, pesticide residues are eliminated by adopting ultraviolet irradiation, meanwhile, a projection area can be generated, the number of the placed objects is judged according to the area of the projection area, so that the intensity or the area of the ultraviolet illumination is adjusted, the intensity of ultraviolet rays directly irradiated on the drawer body is reduced, the aging effect of the ultraviolet rays on the drawer is weakened, and the service life of the product can be prolonged.

The invention discloses a clamp type inertia piezoelectric linear motor. The clamp type inertia piezoelectric linear motor comprises a stator fixing frame and an output rod, the stator fixing frame isof a hollow structure, the two ends of the stator fixing frame are connected with a left lever and a right lever respectively, the upper ends and the lower ends of the left lever and the right leverare horizontally provided with an upper clamp block and a lower clamp block respectively, and a wedge block is placed between the two lower clamp blocks; annular laminated piezoelectric ceramic is arranged in the stator fixing frame, the upper end of the annular laminated piezoelectric ceramic abuts against the inner surface of the upper end of the stator fixing frame, the lower end of the annularlaminated piezoelectric ceramic abuts against the upper end of the wedge block, the output rod sequentially penetrates through the stator fixing frame, the annular laminated piezoelectric ceramic andthe wedge block downwards, and the lower end of the output rod extends out of the wedge block. According to the inertia piezoelectric linear motor, the stator adopts a clamp type structure, the leftlever and the right lever can be adjusted, and different precision requirements are met; and meanwhile, the clamp type structure can improve the output thrust by increasing the positive pressure and the friction force between the clamp and the output rod during working while realizing high precision.

The invention relates to a system for cloud-aid estimation of a semi-trailer active suspension state, and a design method. The system comprises a sensor sampling unit, an event triggering unit and a filter unit, wherein the sensor sampling unit comprises vehicle-mounted sensors which are distributed on a front wheel suspension and a rear wheel suspension of a semi-trailer active suspension; the event triggering unit comprises two event triggering devices which are correspondingly connected to the vehicle-mounted sensors of the front wheel suspension and the rear wheel suspension; and the filter unit is disposed on a cloud server and comprises two filters which are correspondingly connected to one event triggering device by network. In the system, the vehicle-mounted sensors of the front wheel suspension and the rear wheel suspension are connected to the filters by one event triggering device to form two independent state estimation subsystems; and the two filters conduct state estimation of the semi-trailer active suspension according to sampling information of the sensors sent from the event triggering devices. In comparison with the prior art, the system provided by the invention has the advantages that reliable estimation of the automobile active suspension states can be achieved; automobile manufacture expenses can be reduced; and network communication burdens can be relieved.