272results about How to "Solve rationality" patented technology

The present invention discloses a true triaxial test ultrasonic wave and acoustic emission testing system. According to the present invention, a true triaxial test apparatus has six sides of pressurization units, wherein ultrasonic wave and acoustic emission coupling test transducers are arranged between every side of the pressurization unit and corresponding surfaces of rock, a communication terminal of at least one ultrasonic wave and acoustic emission coupling test transducer is connected with a signal output terminal of a multi-channel ultrasonic wave defect detector, communication terminals of other ultrasonic wave and acoustic emission coupling test transducers are respectively connected with a signal input terminal of the multi-channel ultrasonic wave defect detector and a signal receiving terminal of an acoustic emission instrument through signal shunts, and the acoustic emission instrument and the multi-channel ultrasonic wave defect detector are connected with a computer. With the present invention, an ultrasonic wave test and an acoustic emission test can be performed on the same rock, completely comprehensive data information can be provided for understanding of deformation and breaking law, and mechanics mechanism of the rock, and adverse affects on test results by difference of different blocks can be avoided.

The invention provides an active power intelligent control system and an active power intelligent control method for a cluster wind farm. Stable and reliable operation of a power grid under various operation modes is guaranteed, the transmission capacity of the power grid and the acceptance capacity to wind power are improved to the greatest extent, meanwhile, intelligentization of a scheduling decision is realized, and a wind farm power generation plan is automatically calculated and issued, so that maximal effort of the wind farm is realized, miniaturization and optimization of a wind driven generating set under a condition that an accident occurs in the power grid are guaranteed, and the aim of fully utilizing new resources such as wind energy is fulfilled.

The invention provides a drilled hole effective extraction radius measuring method based on a gas content method, and belongs to the technical field of coal seam gas extraction. The method comprises the following steps that (1) the gas extraction rates under the different residual gas content conditions are respectively calculated; (2) the gas extraction rate eta 5 is determined according to the regulations of the Coal Mine Gas Extraction Basic Index; (3) the gas extraction rate eta is calculated; (4) the total extraction quantity of gas is calculated; (5) the number N of extraction drilled holes is calculated; (6) the N drilled holes are evenly distributed in an extraction drilled hole control area, and the drilled hole extraction radius within certain extraction time is calculated. The effective extraction radius can guide to design the reasonable extraction drilled holes, the aim of eliminating prominent dangerousness can be achieved through the method on the premise of meeting the pre-extraction time, and a large amount of manpower and a large number of financial resources and material resources can be saved.

The invention discloses a coal-mine gas geology four-dimensional analysis method. The method includes acquiring depositional environment data, geologic structure data and hydrocarbon generating history data, and determining a gas enrichment save state, a gas occurrence main controlling factor and a coal and gas outburst risk degree in a study area; then performing gas geology unit division and testing point arrangement; and finally establishing a gas occurrence mathematical model and forming a gas geologic map. According to the coal-mine gas geology four-dimensional analysis method which is established from four-dimensional angles of space ( an area or a layer ) and time, original coal-mine gas geology analysis methods are broken through; the difference problems of gas occurrence or coal and gas outburst disasters on different coal layers, which can not be explained by traditional gas geological theories under same geologic structure conditions on the layer, are solved; and area and layer analysis of coal-mine gas geologies is achieved, problems that a gas geology unit is difficult to divide and different persons acquire different results according to the same data are solved, the work loads of gas geology analysis are reduced, and the guide of safety production is truly achieved.

The invention discloses a layout method and system of a network topological diagram. The method of the invention comprises the following steps: the connectivity of the target topological diagram is analyzed, if the target topological diagram is not connected, the topological diagram is decomposed into a plurality of connected subgraphs; the connected subgraphs are laid initially according to a pattern which is similar to the square though the rectangular block layout algorithm while the coordinates of the connected subgraphs are obtained; the nodes of the connected subgraphs which are through initial layout are laid according to the layout algorithm of a driver under stress so that the system total kinetic energy of the target topological diagram is less than a set value and the relative coordinates of the nodes of the connected subgraphs are obtained; and the coordinates of the nodes of the connected subgraphs are obtained according to the coordinates of the connected subgraphs and the relative coordinates of the nodes of the connected subgraphs.

The invention discloses a novel heat accumulating type compressed air energy storage system. On the basis of a heat accumulating type compressed air energy storage system, work procedures of the system are optimized, by the characteristic that a compressor unit and an expansion unit share a heat exchanger, the compressor unit, a heat accumulating system and the expansion unit are coupled together well through a three-way reversing valve, and problems that interstage heat exchangers of the heat accumulating type compressed air energy storage system are arranged repeatedly, system processes are not reasonable, excessive lands are occupied, cost is high, heat energy utilization rate is low, then system running efficiency is reduced and the like are solved. The novel heat accumulating type compressed air energy storage system has the advantages of simple and compact structure, high system efficiency, good heat exchange effect, low manufacturing cost and the like.

The invention belongs to the field of the automatic control of intelligent automobiles and relates to an automobile obstacle avoidance lane-change path planning method. According to the method, initial point coordinates, target point coordinates and a road heading angle are acquired through corresponding equipment, wherein the initial point coordinates are the geodetic coordinates of a set distance which is covered by an automobile along a travel direction from a current automobile position, the target point coordinates are geodetic coordinates of a position of which the distance is the sum ofthe body width of the automobile by which the end point of an obstacle ahead deviates from a lane-change direction and a set safe lateral distance, and the road heading angle is the automobile heading angle of the automobile which has arrived at the target point coordinates; curve fitting is carried out according to the initial point coordinates, the target point coordinates and the road headingangle, so that a lane-change path from the initial point coordinates to the target point coordinates can be obtained, so that the lane-change path of the automobile can be planned reasonably; and therefore, the problem that the automatic obstacle avoidance or lane-changing path planning is unreasonable in the automatic driving of an intelligent automobile is solved.

The invention provides an outpatient service information management system. The outpatient service information management system comprises an outpatient service clinical information database for storing the personal health information of a patient, a pre-hospitalization health information questionnaire analysis module for providing a pre-treatment health information questionnaire for the patient, an in-hospital diagnosis and treatment management module for managing pre-treatment suggestions generated according to the pre-hospitalization health information questionnaire analysis module by the patient, all diagnosis and treatment information generated in a hospital treatment process, and a treatment scheme, a post-hospitalization health management module for providing subsequent health management suggestions for the patient according to patient diagnosis and treatment information managed in the in-hospital diagnosis and treatment management module and the treatment scheme, and performing monitoring, and a system external interface integrating module for realizing data interaction between an outpatient service management system and other external systems. Through adoption of the outpatient service information management system, the outpatient service queuing time of the patient in a hospital can be effectively shortened, the outpatient service working efficiency is increased, communication channels and communication time between the patient and a doctor are increased and prolonged, and the doctor-patient relationship is improved.

The invention discloses a multi-specification plate-oriented rectangular part layout method. The method includes the steps of: 1. inputting initial data of plates and rectangular workpieces; 2. carrying out the multi-specification plate layout through a multi-specification plate layout module according to the specifications and the number of the rectangular workpieces; 3. obtaining a plate combination sequence through a plate combination construction algorithm according to the total area of workpieces, the specifications and the number of the plates; performing broadened selection of plate combinations on the plate combination sequence to obtain a plate combination; and then calculating whether the plate combination can discharge all the workpieces through a grouping strategy-based single-plate layout algorithm in the multi-specification plate layout module, if the plate combination cannot discharge all the workpieces, tracing back to the broadened selection of plate combinations, and if the plate combination can discharge all the workpieces, outputting the plates subjected to the layout. The multi-specification plate-oriented rectangular part layout method provided by the invention breaks the limitation of unreasonable selection of only original rectangular parts and unreasonable layout of single plates in the prior art, and has a wider range of application.

The invention discloses an attribution method and device of information putting effects. The method comprises steps of after counting information conversion frequency and information reaching frequency brought by each channel combination consisting of a single channel combination put by an information putting party within a set period, determining the information conversion rate of each channel combination according to the information conversion frequency and the information reaching frequency brought by each channel combination; determining the weight of each single channel in each channel combination according to the information conversion rate of each channel combination; and based on the weight of each single channel in each channel combination, determining the information conversion frequency brought by each signal channel. Compared with the current attribution method of information putting effects, the provided method is characterized in that effects caused by different channel cooperation are fully considered, so it can be ensured that the distribution weight corresponding to each signal channel is quite precise and proper, and problems of improper and inaccurate attributionin the current attribution method of information putting effects are solved.

The invention provides a rapid water supply pipe network model correction method for adjusting node flows and pipeline resistance coefficients at the same time. The method comprises the following steps of: grouping and initializing pipeline resistance coefficients; grouping and initializing node flows; calculating a residual error between an observed value at a monitoring point and a calculated value; calculating a pipe network monitoring point sensitivity matrix; calculating a parameter adjustment value; and updating a parameter value. The method has originality, is an important supplement inthe field of water supply pipe network model correction research, provides important technical support for intelligent online monitoring and management of water supply pipe networks, and has good population value and practical engineering application value.

The invention discloses a compound raspberry wine provided with a biological effect and a production method thereof. The compound raspberry wine is prepared from the following berries by weight: 30%-35% of red raspberries, 20%-25% of black raspberries, 30%-35% of black mulberries, 5%-10% of black currants and 4%-7% of wolfberries. The production method comprises the following steps: weighing and cleaning the berries; mixing the berries and freezing the berries at a low temperature; filling a fermentation tank with carbon dioxide; heating and coldly soaking the burst mixed berries; fermenting and mixing with sugar; terminating fermentation; naturally subsiding and separating; feeding clarifying agents and separating; removing particle impurities in clarified wine, regulating the concentration of sulfur dioxide and obtaining qualified wine products through a membrane filtering machine. According to the invention, the berry raw materials and weight ratio thereof are reasonably combined, so that not only are the compositions of functional ingredients in the wine products enriched, and the taste characters of the products are improved, but also fermentation berries and wine can be protected from being infected by aerobic bacteria, therefore, the safety of fruits and wine is ensured.

The invention provides a direct current load flow computing method with network loss considered. The method comprises the following steps of collecting data, computing node injecting active power, listing a direct current load flow equation and solving, computing electric grid branch active power loss, judging whether an iterative operation is conducted or not, and computing network loss equivalent load. The method is improved based on a standard direct current load flow computing method, the active power loss generated by branch resistance is considered, the node injecting active power is corrected by the adoption of the network loss equivalent load, and a direct current load flow computing result with the network loss considered is acquired through the iterative operation method. By means of the direct current load flow computing method with the network loss considered, the problems of the unbalanced active power and unreasonable active power distribution due to ignoring the network loss in standard direct current load flow computing are solved, and the direct current load flow computing result more approaches the real load flow result.

The invention discloses a compound fertilizer special for drip irrigation of cucumber in a greenhouse, which comprises the following nutritive elements in each hm<-2>: 391.41 kg of N, 255.43 kg of P2O5, 416.91 kg of K2O, 65.25 kg of CaO, 46.50 kg of MgO, 26.46 kg of Fe, 17.60 kg of Mn, 9.70 kg of Cu, 6.46 kg of Zn, 3.00 kg of B and 1.50 kg of Mo. The compound fertilizer special for the drip irrigation of the cucumber in the greenhouse with high applicability is prepared by a physical method through field trails and verification research based on a nutrient preserving capability and a water requirement principle and a nutrient requirement principle of the cucumber.

The invention provides an apple picking manipulator, and solves the problems that an apple picking mode is not reasonable and is low in efficiency in the prior art. The manipulator comprises an operation rod, wherein a first sliding block which is positioned in the operation rod is arranged on the lower part of the operation rod; the first sliding block linearly moves along the operation rod in a reciprocating manner; a clamping mechanism is arranged at the upper end of the operation rod and comprises two manipulator bodies; the manipulator bodies are hinged to the operation rod; an accommodating cavity is formed between the two manipulator bodies; a pull rod which is positioned in the operation rod is further arranged at the upper end of the operation rod; the extending direction of the pull rod is the same as that of the operation rod; the upper end of the pull rod is hinged to the two manipulator bodies through two second connecting rods; the first sliding block is connected with the pull rod through a first pull wire; clamping operation of the manipulator bodies is implemented by the first sliding block through the first pull wire, the pull rod and the second connecting rods; a cutting mechanism is further arranged in each manipulator body; and the cutting mechanisms act after action of the clamping mechanism is finished. The apple picking manipulator is simple in structure and convenient to use and has quite good practicality.

The invention discloses functional compound berry wine and a production method thereof; the functional compound berry wine is produced from the following berries in percentage by weight: 5-7% of cranberry, 4-6% of vaccinium uliginosum, 6-8% of blackcurrant, 5-7% of garnetberry, 12-14% of red raspberry, 20-22% of black raspberry, 6-8% of yellow raspberry, 5-8% of pineberry, 4-7% of strawberry, 5-8% of sea-buckthorn, 9-12% of mulberry and 5-7% of medlar. The production method comprises the following specific steps: the berries are weighed for cleaning, mixed, and frozen at the low temperature; the mixed berries, after being broken through expansion, are put in a fermentation tank for synchronously heating; when the berries are fermented, the sugar degree is regulated; sulfur dioxide is added to stop the fermentation; the skins and the residues are separated; raw wine is precipitated by adopting a natural precipitation method; supernate is pumped out; a clarifying agent is added to separate the precipitates to obtain the clarified wine; particle impurities are removed through filtering; microorganisms are removed to obtain the qualified wine product. The berry raw materials and the weight ratio thereof are reasonably matched, so that the composition of functional components in the wine product is enriched, and the taste characteristic of the product is improved; the functional compound berry wine is drunk for refreshing.

The invention discloses a household garbage disposal system. Processing equipment of the household garbage disposal system successively comprises a primary crusher primarily crushing household garbage, a sorting conveyor manually sorting glass, rocks and non-combustible substances, a magnetic separator sorting magnetic substances, a secondary crusher crushing crushed substances of the household garbage into small pieces, a drying oven drying the small pieces of crushed substances by utilizing hot wind, an agitator putting additives into the dried small pieces and performing mixing processing, a primary pulverizer primarily pulverizing the small pieces with the additives into fragments, a screening machine sorting the nonmagnetic incombustible substances through proportion screening and rotating screening from the fragments, a secondary pulverizer secondarily pulverizing sorted pulverized substances without the nonmagnetic incombustible substances into small pulverized particles, a molding machine performing molding processing on the small pulverized particles after secondary pulverizing, and a cold dryer drying a molded garbage derived fuel by utilizing cold wind.

The invention discloses a stayed prestressed orthogonal space tube truss steel grid structure and a manufacturing method thereof. A grid (1) of the structure is formed by mutually orthogonally connecting x directional space tube trusses (2) arranged in the x direction and y directional space tube trusses (3) arranged in the y direction; x directional prestressed space tube trusses (4) are arranged at about 1 / 3 positions of two sides of the grid (1) in the x direction, and y directional prestressed space tube trusses (5) are arranged in the y direction; and prestressed steel cables (6) and steel cable steering support frames (7) are arranged on the x directional prestressed space tube trusses (4) and the y directional prestressed space tube trusses (5). The structure is in a novel steel grid roof structure form, and is applied to a super-large span (L is more than or equal to 120m and less than or equal to 180m), the plane dimension of which is close to square; under the condition of ensuring deformation and strength, the consumption of steel can be lowest, and the manufacturing cost of engineering is reduced; and the structure is a safe, reasonable, advanced and economic novel structure system.

The invention discloses an intelligent compressible classification garbage can. The intelligent compressible classification garbage can comprises multiple single garbage cans. One side of each single garbage can is provided with a convex groove, the other side of each single garbage can is provided with a corresponding groove, and the convex grooves and the grooves are used for clamping of the single garbage cans. Each single garbage can comprises an inner can body and an outer can body, a can body of each single garbage can is formed, a garbage throwing opening is formed in the top of each inner can body, a throwing opening start switch is arranged on the front face of each outer can body, a power supply and uncapping mechanism are arranged on the front face of each outer can body, an infrared induction device is arranged on the garbage throwing opening in each inner can body, and an infrared induction switch is arranged beside the garbage throwing opening in the top of each inner can body. Each single garbage can further comprises a compressing mechanism and a foot step type compression plate used for compressing garbage, and the foot step type compression plates are arranged at the bottoms of the single garbage cans. The major problems of garbage disorderly stacking and unreasonable space utilization of cities are effectively solved, the city garbage is reasonably recycled and used in order, and the garbage can use mode is innovated and improved for pedestrians.

The invention discloses an electing method for a side span overhang-middle span cable-stayed three-tower self-anchored type combination suspension bridge, which belongs to the erection field of the suspension bridge. In order to solve the problem of safety risk existing in the erection process of the existing side span overhang-middle span cable-stayed three-tower self-anchored type combination suspension bridge and in a temporary consolidation dismantling and horizontal force conversion process, the electing method comprises the following steps of: (1) forming a cable-stayed bridge of a middle tower and a girder suspended by a side tower; (2) closing the girder; (3) erecting a side tower cable lifting system; (4) dismantling a suspension section support; (5) adjusting a cable-stayed backstay, a suspension cable and a cable-stayed bridge; and (6) finishing the bridge. In the electing method, the construction working procedure of construction and dismantling of the temporary consolidation between the side tower and the girder is cancelled and the construction working procedure of ''side tower cable lifting system erection'' is carried out after all closure openings of are closed, thereby shortening the construction period, saving material consumption and cost of machinery one-shift and avoiding security caused by removing the temporary consolidation bearing strong horizontal force.

The invention relates to a CAN bus node address distribution method and a system. The method comprises the following steps: a slave node controller produces a group of random number through a random number generator, the group of random number forms a temporary CAN network node address of the slave node; the slave node sends a data frame to a master node; the data frame contains the temporary CANnetwork node address of the slave node and a command for acquiring the address; the master node receives the data sent by the slave node, and distributes the corresponding address to the slave node according to the temporary CAN network node, and correspondingly generates storage table entries; the slave node receives the data, modifies the temporary address of the slave node as the address distributed by the master node. The method disclosed by the invention effectively solves the problems that the software and hardware resources are wasted, and the address distribution is unreasonable and conflict since a dial switch and a pull-up resistor and a pull-down resistor are adopted, or the program is directly modified in the prior art by adopting the method of automatically generating the random number node address by the slave node and requesting the distribution from the master node.

The invention discloses special compound fertilizer for drip irrigation of greenhouse grapes, which comprises the following nutrient elements based on fertilization ratio: 164.47kg hm<-2> of N, 77.08kg hm<-2> of P205, 256.47kg hm<-2> of K2O, 24.32kg hm<-2> of CaO, 12.538kg hm<-2> of MgO, 9.30kg hm<-2> of B, 6.36kg hm<-2> of Fe, 4.22kg hm<-2> of Mn, 1.21kg hm<-2> of Cu, 0.38kg hm<-2> of Zn and 0.35kg hm<-2> of Mo. On the basis of soil nutrient-supply characteristic and law of water and nutritional demand of the grapes, the special compound fertilizer for drip irrigation of the greenhouse grapes with strong applicability is obtained by a physical method through field experiments and check research.

The invention relates to a method for negative-pressure boiling extraction and preparation of a low-acid ginkgo extract from ginkgo leaves. According to the method, crushed fresh ginkgo leaves or dry ginkgo leaves are used as a raw material, hydrous ethanol is used as an extraction solvent, negative-pressure boiling extraction is carried out, then a liquid extract is filtered and then pretreated by using quartz sand and microporous centrifugal filtration, a filtrate is separated and purified by using a ceramic membrane and an ultrafiltration membrane, a solution passing through the ultrafiltration membrane is concentrated by using a nanofiltration membrane, then ethanol is recovered, a concentrate is subjected to purification with a macroporous resin and phenolic acid removal with a deacidification resin, and negative-pressure microwave spray drying or vacuum freeze drying is carried out so as to obtain the low-acid ginkgo extract. The low-acid ginkgo extract prepared by using the method has a low acid value, high purity, ginkgetin content of more than 28%, lactone content of more than 8% and ginkgolic acid of no greater than 1 ppm, and the method may become a novel technology for industrial production of a low-acid ginkgo extract product.

A join structure between the transverse beam and the vertical column for the curtain wall of building features that a joining part with particular shape, two or more slot openings with same direction on its one surface and a boss on the root of its another surface is fixed to vertical column via screws, the transverse beam has the slot opening the its internal cavity and with the direction different from that of the slot opening on joining part for matching them with each other, and the fastener is respectively arranged on said boss of joining part and the side wall in the internal cavity of transverse beam.

The application discloses a picture coloring method and device and a computer terminal. The method includes the following steps: providing a plurality of background color templates, wherein the background color templates are associated with preset color combinations; obtaining the dominant tone of a picture to be colored; determining the preset color combination matching the dominant tone according to the dominant tone; and using the background color template corresponding to the matching preset color combination to color the picture to be colored.

The invention belongs to the technical field of network, in particular relates to a data concurrency transmission method of a multi-network interface device. The method comprises the following steps: (1) a transmission end and a reception end detect the amount of network interfaces for communication and label the network interfaces so that each network interface for communication has a serial number; (2) the transmission end divides the data to be transmitted into a plurality of message segments and adds transmission serial number for each message segment; (3) the transmission end remainders the transmission serial number of the message segment to the amount of the network interfaces and transmits the message segment according to the obtained remainder by selecting the corresponding network interface; and (4) the reception end orders the received message segments. The invention can fully utilize the traditional network to solve the problems of unreasonable data distributing and dispatching, disordered reception, low retransmission efficiency, and the like by an improved grouping dispatching algorithm.

The invention relates to a novel floating-ball-controlled initial rainwater flow-discarding device which comprises a box body, a water inlet pipe, a flow discarding pipe, a collecting pipe, a secondary collecting pipe, an upper analogous floating ball body and a lower analogous floating ball body, wherein the box body is divided into an upper box body and a lower box body which are connected through an I-shaped opening; the water inlet pipe and the collecting pipe are arranged at the upper end of the upper box body, the secondary collecting pipe is arranged at the upper end of the lower box body, the lower end is connected with the flow discarding pipe, a soleplate is arranged at the bottom, a baffle plate is arranged on the inner wall of the lower box body, and the upper analogous floating ball body with the thickness larger than the pipe diameter of the secondary collecting pipe is arranged on the baffle plate and connected with the lower analogous floating ball body with the thickness larger than the pipe diameter of the secondary collecting pipe through a connecting line. The invention has the characteristics that the circulation switching of rainwater between the collecting pipe and the flow discarding pipe is realized through the positions of the analogous floating ball bodies, and the flow discarding mode is simple and easy to control, so that initial rainwater and later rainwater are effectively separated, the rainwater collection stopping time can be judged, and the magnitude of the flow discarding quantity can be automatically controlled. The device has the advantages of no electronic equipment, simple structure, durability and convenient maintenance and overhauling.

The invention discloses a network access point management process and a mobile terminal, wherein the method comprises: configurating access point names of the network access point according to the requirement, for each JAVA application of the mobile terminal; under the condition that the mobile terminal enforces JAVA application, connecting the enforced JAVA application to the network access point corresponding to the configurated access point name. According to the technical scheme, different network resources and service quality provision can be supplied for different JAVA application, thereby ensuring the efficient utilization of the network resources, and satisfying JAVA application requirement of different users, advancing the user experience.

The invention discloses a single-arm and double-arm auxiliary minimally invasive surgical operation robot and a cooperative combined robot system, which comprise a base, an upright post and an operating arm, wherein the base supports and fixes the whole auxiliary minimally invasive surgical operation robot; the upright post is vertically fixed on the base and supports and fixes the operating arm of the auxiliary minimally invasive surgical operation robot; a connecting seat of the operating arm is connected with a quick joint; an endoscope or a surgical instrument is arranged on the quick joint; the surgical instrument performs spherical rotating motion around a cutting point of a human body surgical site; four or more single-arm combined cooperative minimally invasive surgical robots areadopted to cooperate for surgical operation; the upright post and an arm section I are in a hollow structure; and adjacent arm sections of the upright post, the operating arm and the connecting seat can rotate relatively and be nested through rotating joints between the arm sections, so that each arm section of the operating arm, the connecting seat and the surgical instrument are nested at the inner side of the upright post.

The invention relates to a ray principle based cloud data compaction algorithm with boundary reservation. According to the ray principle based cloud data compaction algorithm, rays are hypothetically generated from the center of a three-dimensional point cloud model to all directions evenly, and a whole three-dimensional space is filled with the rays; for the point cloud model in the space, if the distance between a certain point in the model and the nearest ray is smaller than a given threshold value, the point is taken as a point required to be compacted; it is easily known that the more intensive the rays are, the larger the threshold value is, and the more easily the data point in the three-dimensional point cloud model is compacted; therefore, compaction effects at different degrees can be achieved through control of the number of the rays and other threshold values. A boundary reservation method is provided to effectively guarantee model integrity. In a certain compaction degree range, the three-dimensional point cloud data compaction algorithm not based on curvature calculation has good compaction effect and high compaction efficiency and can well maintain model boundary characteristics.