81 results about "Grasshopper" patented technology

The invention relates to the technical field of high polymer materials and preparation thereof, and discloses a wet anti-slip bionic friction pad on a glass surface, which is inspired by a micro-nano structure of toe pads of organisms such as tree frogs and long-horned grasshoppers with wet friction increasing characteristics, and a bulge array is added on the surface of a high-friction material, so that the friction coefficient of the friction pad is increased; the microstructure arrays can discharge a water film on the surface of the friction pad under the capillary action in a wet environment, and the effective contact area between solids is increased, so that the friction pad and a friction surface are always kept in a dry friction state, and stable friction force is ensured. The friction pad comprises a connecting layer, a supporting layer and a tail end protruding straight column array, a tail end contact layer is in a hexagonal straight column shape, the diameter of an inscribed circle of a hexagonal micro-column structure ranges from 5 micrometers to 5000 micrometers, column bodies are densely arranged in a hexagonal mode, the height of the column bodies ranges from 10 micrometers to 1500 micrometers, the tail ends of the column bodies are planes, the interval between every two column bodies ranges from 2 micrometers to 600 micrometers, and tight drainage grooves are formed.

The invention discloses a Grasshopper-based complex curved surface curtain wall modeling method, and relates to the technical field of digital design and construction of buildings, and the method comprises the steps: firstly inputting the geometric dimension, load parameters, thermal expansion coefficient, material attributes and environmental parameters of a curtain wall into a parameterization platform at an input end, and generating an original curtain wall model; performing topological optimization and geometric correction on the original curtain wall model through curved surface reconstruction to obtain a reference curtain wall model; performing grid segmentation on the reference curved surface based on a discrete differential geometry method, and calculating the size of a unit plate; constructing a structural system by utilizing a finite element analysis module and a parameterized platform; according to deformation characteristics of glass plates and installation components, parameterization adjustment is conducted on construction nodes to compensate errors, the planarization size of a unit plate and the sectional size of a frame are optimized, construction data are finally output, multi-parameter digital automatic linkage of the complex curved surface curtain wall from design to construction is achieved, and therefore the modeling precision and efficiency of the complex curtain wall are improved.

The invention provides a grasshopper-based planing boat parametric modeling method and system, belongs to the technical field of computer aided design, and aims to solve the problems that in the planing boat modeling process, due to the fact that parameters need to be repeatedly determined, the modeling efficiency is low, the modeling design flexibility is insufficient, the interactivity and visual experience are poor, and the modeling cost is high. The method comprises the following steps: constructing a main line segment and carrying out draught control; controlling a hull chord line through curvilinear function mapping; constructing a hull bilge edge line; constructing a boat body keel line; constructing a middle parallel section of the hull; mirroring to generate a complete hull; the system comprises a user interaction interface, a parameter processing module and a model generation module.

The invention discloses a Grasshopper-based complex keel high-precision modeling method, which comprises the steps of S1, constructing a three-dimensional curved surface model of a curved surface where a keel center line is located; step S2, constructing a keel center line three-dimensional distribution model on the three-dimensional curved surface model in the step S1; and S3, obtaining a three-dimensional distribution model of each edge of each keel according to the offset of the three-dimensional distribution model of the central line of the keel in the step S2, and obtaining a three-dimensional solid model of each keel according to the three-dimensional distribution model of each edge of each keel. According to the method, the edge line model of the keel is obtained through the curve parameter offset method, the three-dimensional solid model of the keel is further constructed through the edge line model of the keel, and compared with an existing modeling method of point taking, lofting and stretching, the method has the advantages that since all points of the center line of the whole keel serve as target points for offset, the point taking process does not exist; fitting errors are prevented from being introduced to a large part with the curvature of the keel, and the modeling precision of the complex keel is effectively improved.

The invention discloses a curtain wall light evaluation rapid calculation method based on Rhino, relates to the technical field of curtain wall light environment evaluation, and is used for solving the problems of complex modeling and low calculation efficiency of traditional curtain wall light evaluation. According to the method, an integrated three-dimensional model containing a site environment, a target building and an indoor space is built through Rhino, and data adaptation, coordinate calibration and fine modeling are completed; based on Grasshopper, defining three types of core parameters of optical attributes, geographic position data and meteorological data of the material, and constructing an associated data set; solar radiation and reflected light are calculated according to scenes, and reverse tracking and Ladybug algorithm coupling optimization calculation is combined; visualizing simulation results and extracting quantitative indexes, and generating targeted curtain wall design optimization measures; the curtain wall light environment is quickly and accurately simulated, and the light evaluation efficiency and the calculation precision are remarkably improved.

The invention discloses a Grasshopper-based structure stress field visualization method and system, and the method comprises the steps: S1, building a two-dimensional plane model, and carrying out the grid unit division and grid center point calculation; unit node coordinate information and unit node stress data of the printing component are obtained; s2, matching the unit nodes with the grid center points to obtain stress data of the grid center points; s3, calculating the principal stress and the principal stress direction angle of the grid center point; and S4, according to principal stress information needing to be expressed, directed line segments are adopted at the positions of the center points of the grids for expression, stress field visualization of the printed component is achieved, and the directed line segments are arranged in the mode that the arrow points to the principal stress direction, and the length of the line segments represents the size of principal stress. Visual expression of principal stress information including the magnitude and direction of principal stress in the stress field of the printing component is achieved, and effective data are provided for a printing path design method based on stress flow guidance.

The invention discloses a BIM model number inputting and auditing method based on GH and Revit. A two-dimensional drawing is cleaned and number data is extracted through Rhino, the centroid of a BIM model component is extracted by utilizing Grasshopper and is projected to generate a point cloud, the number of the two-dimensional drawing and the BIM model component are matched based on a nearest neighbor algorithm, and batch inputting and dynamic synchronous updating of the number are realized. And reading an instance parameter value of the BIM model component through Grasshopper, and automatically comparing the instance parameter value with the two-dimensional drawing number data set to generate an Excel auditing report containing a consistency mark. The invention relates to the technical field of building modeling, and can solve the technical problems in the prior art.

The invention discloses a Grasshopper-based bamboo engineering material basic unit modeling and calculating method, which comprises the following steps of: drawing a combination and cutting scheme of basic units in a bamboo engineering material component design section in Rhinoceros software according to the specification of the basic units of a bamboo engineering material, inputting the section scheme and three-dimensional axes of a plurality of linear components into a Grasshopper plug-in, and constructing a Grasshopper-based basic unit model and a Grasshopper-based basic unit model; creating a three-dimensional model entity of each basic unit in the Grasshopper plug-in, feeding back the material ratio from multiple levels such as the sectional area and the total volume, feeding back the number of male and female groove connecting nodes of the basic units in the rift grain direction, and guiding optimization and adjustment of a scheme or guiding subsequent blanking and processing. The cost is reduced, and the working efficiency is improved.

The application discloses a kind of based on agent model's air bag template ice shell building weatherability optimization design method, it is related to building design technical field.The problems that existing technology lacks the quantitative evaluation index of ice shell building weatherability and lacks the construction of universal agent model are solved, including: S1 stage is established microclimate response agent model, through orthogonal experimental design to generate ice shell case set, extract morphological characteristics and spatial characteristics, obtain wind snow distribution label by combining CFD simulation, construct neural network agent model;S2 stage is fused multiple tools to realize performance optimization, utilize Grasshopper parametric modeling to extract features, call agent model to predict surface snow wind distribution, obtain radiation data jointly by Ladybug, combine sublimation rate to calculate initial and later strain energy and weatherability index, finally, morphological parameters are multi-objective optimized by NSGA-II algorithm, it has application prospect in the field of ice shell building structure optimization.

The invention belongs to the technical field of agricultural biological control, and discloses a method for controlling summer shoots of Gannan navel oranges by insects, which comprises the following steps: S1, in the early germination stage of the summer shoots of the navel oranges in early May, putting 3-4 Acrida cinerea imagoes every 8m according to the projection area of a tree crown; s2, in the summer shoot germination peak period in the first ten days of June, the release amount of acrida cinerea is increased to 6-8 acrida cinerea per 8 m. By means of shoot control mechanism innovation, grasshoppers specifically gnaw young shoot growing points, side bud germination is prevented from being stimulated, and the vicious circle of'more and more wipe 'is blocked from the biological level; the shoot control efficiency is increased, the shoot control rate can reach 99.2% or above by the putting amount of 3-4 shoots per 8m, and the whole summer shoot growing period is covered continuously and periodically; the feeding rate of old leaves is strictly controlled to be 3.6% or below, the influence on the photosynthesis of a tree body is avoided, a precise shoot control technology is achieved based on biological habits, efficient and safe shoot control treatment is achieved, the survival conditions of diaphorina citri are worsened, the occurrence of the Huanglongbing is reduced, and the economic benefits of navel orange planting are improved.

1. The name of the product of this design: Toy transformable robot (grasshopper). 2. Purpose of the product of this design: transformable robot toy. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The present invention discloses a method for generating Archicad parametric components by using Grasshopper, comprising: parsing GDL commands, encapsulating GDL commands required for graphics processing into operators in Grasshopper; placing operators required for graphics operation in Grasshopper to generate parametric components; outputting GDL code text corresponding to the parametric components in Grasshopper; copying the GDL code text into Archicad to obtain Archicad parametric components. The present invention solves the problems of great difficulty, slow speed and poor readability in flexibly generating parametric components by GDL language.

The present invention discloses an intelligent design method for building stairs based on Grasshopper platform. The method only requires the building staircase designer to fill in the known parameters of the target building stairs in an Excel table and set the global adjustable parameters in the Rhino software. Then, a battery pack created in a Grasshopper plug-in can be used to generate equal run suggestion schemes and unequal run suggestion schemes as comprehensive design schemes according to whether a net height JG under the ladder beam is set. The method also generates a splicing section construction drawing of each floor of the target building stairs, an overall section construction drawing, a three-dimensional model of the building stairs and a plan construction drawing of each floor according to the comprehensive design scheme. The method has the advantages of fast modeling speed, high efficiency, high accuracy, good integrity and strong ease of use.

The present invention is a Midas to Revit (M2R) data-driven structural modeling system, comprising: a structural centerline generation module that converts MIDAS GEN data created by a structural designer into Excel and generates structural centerlines in Rhino using the Grasshopper algorithm (a visual programming language and environment used in 3D modeling of Rhino, as well as a graphic algorithm editor); It may include a project setup module that creates Family, Grid, Level, and Material information of structural members in a REVIT project based on MIDAS GEN data created by the structural designer, creates a structural member family corresponding to the member property information of MIDAS GEN using the GRASSHOPPER algorithm, and ensures that the structural member family includes various members used in S-structure, RC-structure, and SRC-structure (structural types of buildings) and is linked to the parameters of the MIDAS GEN data; and a Rhino to REVIT conversion module that models a structural model by linking with a family pre-built in the REVIT project based on the shape and position information of the Rhino structural centerline generated in the structural centerline generation module using the GRASSHOPPER algorithm.

The invention discloses an insecticide scavenger as well as a preparation method and application thereof, the scavenger MTSM is prepared by continuously modifying polyphenol tannic acid and locust cell membranes on mesoporous silicon, the preparation method is simple and efficient, and complex process conditions and procedures are not needed. The scavenging agent particles have a dual-mode scavenging function, and by means of pi-pi accumulation of the insecticide and TA and specific binding with acetylcholin esterase, nicotinic acetylcholine receptors or voltage-gated sodium channels on locust cell membranes, the removal effect on various insecticides such as organic phosphorus, pyrethroid and neonicotine is remarkably improved. Compared with particles which are not modified by locust cell membranes, the MTSM has the advantages that the non-specific removal of digestive enzymes in gastrointestinal tracts is obviously reduced, and the gastrointestinal functions of pollinating insects are favorably maintained. The scavenger disclosed by the invention is high in safety and convenient to prepare, can efficiently remove different insecticides in a broad-spectrum manner, has relatively large transformation potential in the aspect of detoxification of pollinating insects, and is expected to assist sustainable agricultural development.

This invention discloses a method for modeling and calculating basic units of bamboo engineering materials based on Grasshopper. The method includes: drawing the combination and cutting schemes of basic units in the design cross-section of bamboo engineering material components in Rhinoceros software according to the specifications of the basic units; inputting the cross-section schemes and the three-dimensional axes of multiple linear components into the Grasshopper plugin; creating a three-dimensional model entity for each basic unit in the Grasshopper plugin; and providing feedback on material usage ratios from multiple levels, such as cross-sectional area and overall volume, as well as the number of male and female groove joints along the grain direction of the basic unit, to guide the optimization and adjustment of the scheme or to guide subsequent material processing. This invention reduces costs and improves work efficiency.

The invention relates to the technical field of bridge design, in particular to a Grasshopper-based super-large-span steel truss arch bridge visuality parameterization modeling method which comprises the following steps: analyzing bridge structure characteristics, and building an overall logic framework; geographic information and bridge basic information are written into the parameterized C-level module; generating an arch axis curve and an arch structure three-dimensional model through a parameterized arch structure C-1-level module; generating a three-dimensional model of the truss structure by parameterizing a C-2-level module of the truss structure; according to data in the parameterized arch structure C-1-level module, the parameterized truss structure C-2-level module and the parameterized bridge floor position C-3-level module, the bridge floor position is calculated, and a bridge floor three-dimensional model is established; and according to the parameterized lifting basket angle C-4-level module, calculating an outward inclination angle and an inward inclination angle, and establishing an arch bridge three-dimensional model. According to the method, the modeling time of the ultra-large-span steel truss arch bridge structure can be shortened to a great extent, and the modeling precision is greatly improved.

The invention provides a method for applying RhinoGrasshopper in steel structure drawing deepening, and belongs to the technical field of steel structure drawing deepening. The method comprises the following steps that parametric modeling is utilized, modification is automatically executed through control parameters so as to improve modeling efficiency, a curved surface part is split by utilizing Rhino in combination with a Grasshopper parameterization tool, and therefore the modeling efficiency is improved. By compiling the battery pack for extracting the model data, the arrangement point data in the bridge model can be quickly acquired, so that the overall precision and quality of a finished product structure are improved. According to the invention, Rhinoamp; the Grasshopper is applied to the drawing deepening, so that the visualization and parameterization of the deepening process can be realized, and the accuracy and modifiability of the deepening result can be ensured; various batteries and related plug-ins are combined for application, so that establishment and splitting of the model become intuitive and efficient.

The invention relates to the technical field of curved surface runoff analysis, in particular to a data analysis method for rainwater runoff on multiple curved surfaces. Comprising the following steps: S1, establishing a plurality of curved surfaces on Grasshopper according to a to-be-analyzed building roof; s2, randomly generating raindrops above the plurality of curved surfaces, and enabling the raindrops to vertically fall down; s3, when the raindrop is in contact with the curved surface, generating a unit circle around the raindrop, and projecting the unit circle to the curved surface to form a projection curve; s4, judging whether the projection curve is closed or not; s5, when the projection curve is not closed, whether the raindrop reaches the edge of the curved surface or not is judged; s6, the steps from S3 to S5 are repeated, and a continuous flowing path of the rainwater is generated. The method has the beneficial effects that the approximate direction of the normal vector of the raindrops on the multiple curved surfaces is subjected to fuzzy calculation through a regional sampling method, the natural flowing direction of rainwater is judged, the calculation is continuously circulated to form the flowing path of the rainwater, and the continuous flowing path of the rainwater on the building roof is simulated and analyzed; and a reference basis is provided for drainage design of the building roof.

The invention relates to the field of underground powerhouse information of hydroelectric power engineering, and discloses an underground powerhouse three-dimensional model rapid construction method combining Grasshopper and Revit, comprising the following steps: S1, forming a three-dimensional terrain entity according to terrain contour line data and stratum exploration data, S2, determining a plurality of working planes on the basis of the three-dimensional terrain entity; s3, creating a drainage pipe family sample based on Revit, importing Excel data through Grasshopper to carry out parametric modeling, and generating a drainage hole curtain layout; s4, the drainage hole curtain layout generated by the Grasshopper is introduced into Revit through a Revit plug-in; and S5, performing quality inspection and repair on the constructed three-dimensional entity of the underground powerhouse. By combining Grasshopper and Revit parametric modeling technologies, rapid construction from topographic and geological data to an underground powerhouse structure entity is achieved, the problems that traditional manual modeling is long in time consumption and prone to errors are solved, meanwhile, the spatial precision of stratigraphic stratification, fracture simulation and building arrangement can be kept, and it is ensured that the model can be used for engineering numerical calculation and structural analysis.

The application discloses a kind of based on GH's landscape covering soil filling pad layer calculation and visual analysis method, comprising the following steps: in Rhino software, the CAD drawing of landscape covering soil is imported, and Grasshopper plug-in is loaded;Different sampling points are selected on the bottom plate corresponding to landscape covering soil, group the pad layer according to the pad layer number corresponding to each sampling point position, and generate the grid surface domain with explicit boundary by compiling algorithm program through Grasshopper plug-in;Parameter definition is carried out to landscape covering soil, and the thickness of the pad layer corresponding to each sampling point is calculated by inputting different parameter values;Different colors are used to partition for pad layer of different groups, and each item of data about the calculation amount of pad layer material corresponding to each partition is obtained through data processing, and output is used to guide on-site construction, the present application calculates and visualizes the number of filling pad layer and thickness, effectively improves the work efficiency and work quality of designer, and has higher popularization value.

1. The name of the design product: feeding machine. 2. The use of the design product: for feeding grasshoppers with feed. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The invention discloses a grasshopper-based intelligent block division method for a columnar hyperbolic structure construction template, comprising the following steps: establishing a columnar hyperbolic structure 3D model in Rhino software; segmenting the outer skin of the structure 3D model along the height direction, and limiting the chord height deviation of the construction template; determining the actual width of a template standard block in the construction template according to the chord height deviation of the construction template, and determining the number of structure segments that share one template standard block; lofting and flattening the outer skin of each group of structure segments; dividing the flattened outer skin of each group of structure segments by equal arc length; determining and outputting the size of the template standard block and the template additional block in each group of structure segments. The intelligent block division method for a columnar hyperbolic structure construction template of the invention has high design efficiency, high template industrialization degree, and low material consumption, improves the design and construction efficiency of a spatial hyperbolic columnar concrete structure construction template, and has good popularization and application value.

The invention discloses a database modeling method of a unit type curtain wall based on Rhino and Grasshopper. The database modeling method comprises the following steps: creating a curtain wall node information base based on 3D software; based on Rhino software, a curtain wall skin model is established, a curtain wall skin is divided into unit body panels according to curtain wall grids, meanwhile, keel lines on the unit body panels are established, and the keel lines are classified and placed in corresponding model layers; creating a node positioning database in a Rhino built-in plug-in Grasshopper, and constructing a mapping table of a simultaneous panel ID (Identity), a positioning plane and a component model number; and importing the node information base into Rhino software, and quoting information in the database and the mapping table to generate the BIM model. According to the method, the node positioning database is constructed according to the curtain wall panels and the curtain wall keel lines, the mapping table of the simultaneous panel IDs, the positioning planes and the component model numbers is created, the node information base is imported into Grasshopper, and the unit type curtain wall BIM model can be conveniently, efficiently and accurately created by selectively introducing information in the node positioning database and the mapping table.

The invention discloses a Grasshopper-based parameterized modeling method for a polygon projection space distorted surface reticulated shell, which comprises the following steps of: S1, setting geometric parameters of a reticulated shell model in a Grasshopper platform through an input plug-in, and obtaining a corresponding projection surface of a space curved surface reticulated shell surface; s2, connecting vertexes of the projection surface to generate ridge lines forming a reticulated shell curved surface, and constructing a polygonal projection space distorted surface through curved surface generation operation based on the ridge lines; s3, performing grid division on the spatial warping surface by using an isoparametric method or a mapping method to generate grid points; and S4, based on the grid points, generating a single-layer polygonal projection space distorted surface latticed shell structure through a polyline connection plug-in. The method is used for solving the technical problems that an existing spatial reticulated shell structure with a complex shape is difficult to model, the modeling efficiency is low, and the repeated utilization rate is low.

The invention relates to an industrial park building load rapid prediction method based on energy utilization partition. The method comprises the following steps of carding industrial park technological processes through design data or field investigation; key energy consumption characteristic parameters are extracted, and each room in the park building is divided into various energy consumption subareas; the method comprises the following steps: establishing a geometric model through Rhino software, and importing the geometric model into Grasshopper; simulation parameters are set through a Honeybee battery assembly, an OpenStudio simulation engine is called to conduct building load simulation, and a calculation result is exported to be processed and analyzed; the model is modified according to planning requirements, and calculation results of the building loads under different conditions are compared. The method has good adaptability to input conditions, has robustness to change of a research object, simplifies the modeling process, improves the calculation efficiency, realizes rapid and accurate prediction of the building load of the industrial park, and solves the problem that a traditional simulation model cannot give consideration to both simulation precision and calculation efficiency.

The invention provides a rapid stock layout method for batch parts of a steel structure based on combined application of multiple software functions. The method comprises the steps that firstly, a complex building structure model is built through Tekla, CAD, Rhino, Grasshopper and ST plug-ins, node deepening design is conducted, and it is ensured that the model is free of collision; and then, the rod piece is subjected to plate disassembling treatment through an ST plug-in in Tekla, and it is ensured that the attributes of the parts are accurate. Then, a DXF file containing quantity information is exported, and classified statistics is carried out according to materials and plate thicknesses; combining the DXF files by using CAD (Computer Aided Design) drawing combining software, preprocessing, marking the number of parts, and setting as a BOM (Bill of Map) drawing layer; and finally, importing the preprocessed DXF file into ProNest software for stock layout, and adopting an optimal arrangement mode according to the shape of the part to improve the material utilization rate. The method is suitable for the field of steel structure buildings, stock layout efficiency and accuracy can be remarkably improved, and the requirement for rapid machining of batch parts is met.

The invention relates to the technical field of digital path planning, in particular to a Grasshopper-based cylindrical workpiece surface track extraction and path planning method, which comprises the following steps of: acquiring parameters of a user-defined input end; establishing a parameterized two-workpiece intersection model based on the user-defined input end parameters; extracting an intersection track curve of the parameterized two-workpiece intersection model; carrying out point segmentation on the intersection track curve, and extracting to obtain an intersection point coordinate data list; calculating an intersection point coordinate data list, and calculating to obtain the displacement of each curve section along the X-axis direction, the rotation angle around the axis of the workpiece and the arc length on the YZ plane; and calculating and generating path tracking speed data of the surface track of the cylindrical workpiece by combining the tracking required speed, the displacement along the X-axis direction and the rotation angle and the arc length around the axis of the workpiece. According to the method, rapid and universal path planning is realized, and the path can be updated in real time only by modifying input parameters.

The present application relates to a kind of agricultural tillage machinery, specifically is based on the bionic resistance reduction deep ripping shovel of black cicada.The purpose is to provide a kind of bionic resistance reduction deep ripping shovel based on black cicada, shovel handle and shovel tip are respectively bionized in the inner and outer contour curves of black cicada forefoot and black cicada thoracic denticle, to reduce deep ripping shovel tillage resistance, improve the ability of deep ripping shovel to destroy plough bottom layer and soil disturbance.Technical scheme is a kind of bionic resistance reduction deep ripping shovel based on black cicada, it is characterized by including bionic shovel handle and the bionic shovel tip connected in bionic shovel handle lower end, the bionic shovel handle includes shovel handle straight handle section and the bionic section of shovel handle that is arc-shaped and upper end is smoothly connected as a whole with shovel handle straight handle section;The touch of soil side contour line of the bionic section of shovel handle is bionized in the inner contour line of black cicada forefoot second section, the contour line of the bionic section of shovel handle away from soil side is bionized in the outer contour line of black cicada forefoot middle section;The bionic shovel tip includes chisel type shovel tip and a plurality of bionic convex microthorn staggered arranged on the upper surface of chisel type shovel tip.

The present invention discloses an optimization method for the grille structure of a lightweight wood structure floor based on Grasshopper, which includes the following steps: determining three core design parameters of the target floor grille as: grille cross-section specifications, grille spacing, and the number of rows of transverse strengthening members; based on the Grasshopper visual programming tool, completing the check calculation for flexural members in the wood structure specification by calling the built-in arithmetic unit of the Grasshopper visual programming tool, and then calling the Galapagos single-objective optimization arithmetic unit, taking the minimum engineering quantity as the optimization objective of the genetic algorithm, and obtaining the optimal combination values of the three core design parameters of the target floor grille to achieve the optimization of the grille structure of the lightweight wood structure floor. Compared with the prior art, adopting the method of the present invention can quickly calculate the design result of the floor grille that meets the requirements of the structural specification and has the most economical engineering quantity, improving the design efficiency and the economy of the project.