13 results about "Projectile motion" patented technology

The invention relates to the technical field of three-dimensional reconstruction, in particular to a projectile motion three-dimensional reconstruction method and device based on three-dimensional Gaussian splashing, and the method comprises the steps: collecting and preprocessing a simulation data set containing an RGB image sequence and an asynchronous event stream, so as to generate an event representation diagram; jointly segmenting the event representation graph to obtain a background and a projectile target; establishing a 3D normalized coordinate system taking the projectile target as the center to obtain an initial geometric reference; based on a 3D Gaussian splashing method, generating a Gaussian kernel rendering image according to the initial geometric reference, and performing multi-modal joint loss optimization and Gaussian kernel screening on the Gaussian kernel rendering image to obtain a static Gaussian field; and mapping the static Gaussian field to a real coordinate system, and fusing multiple modes, gravity constraint and optical flow smooth loss to optimize the camera pose so as to generate projectile motion parameters. Therefore, the problems that in a traditional reconstruction method, the edge of a high-speed target is fuzzy, optimization is difficult due to no initial geometric reference, and the motion trail lacks physical consistency are solved.

The present utility model is an experimental apparatus for the demonstration of projectile and free-fall motion. The apparatus for demonstration of projectile and free-fall body motion comprises a vertical support, a barrel having for holding a first object, a plunger for causing impact to the first object, a slot for holding a second object, a launcher trigger, and a trigger pin and lock pin. The apparatus simultaneously launches the first object from the barrel and releases the second object from the slot. The present utility model provides flexibility and connectivity in teaching free-fall and projectile motion.

This invention relates to a numerical simulation method for projectile motion based on Fluent-UDF, belonging to the field of fluid dynamics simulation technology. Specifically, it includes: a launch device model consisting of a launch tube and a projectile located inside the launch tube; initialization to obtain the mesh, discrete surfaces, and time steps; starting the simulation; calculating the straight-line distance between the projectile surface and all discrete surfaces at each time step; identifying discrete surfaces with normal distances less than a preset threshold as candidate contact surfaces; obtaining the contact bounce normal vector based on all candidate contact surfaces and their corresponding meshes; reading the current velocity of the projectile; determining whether the projectile has a collision tendency based on the current velocity and the contact bounce normal vector; updating the mesh after obtaining the current velocity of the projectile. This method solves the problem in existing technologies that cannot effectively simulate the physical process of collision bounce when a projectile moves at high speed in a flow field inside a tube.

The invention discloses a millimeter wave large dynamic adaptive time-frequency modeling method based on deep learning. The method comprises the following steps: firstly, actually measuring baseband Doppler signal data by cleaning an external field radar, fitting an in-chamber projectile motion model, and constructing a simulation echo signal model superposed with noise; secondly, performing down-conversion processing on the echo signal, filtering noise by using an adaptive filter, and extracting a pure baseband Doppler signal; converting the signal into a projectile speed curve, and extracting input / output features to construct a data set containing a training set and a test set; and finally, through deep neural network training and testing, establishing an in-gun ballistic performance prediction model. According to the method, the analysis efficiency and prediction precision of the projectile velocity curve in a complex environment are remarkably improved, and reliable technical support is provided for ballistic performance evaluation in a weapon system.

1. Name of the product in this design: Projectile Motion Tracker. 2. Purpose of this design: A physics teaching device for verifying the laws of projectile motion. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to an inner ballistic trajectory design method for a floating series double-chamber balance gun. The inner ballistic trajectory design method comprises the steps of dividing an inner ballistic trajectory process period, establishing a gunpowder combustion model in a main chamber and an auxiliary chamber, establishing a projectile motion model, establishing a balance body motion model, establishing an auxiliary chamber motion model and establishing an inner ballistic trajectory energy conservation model. Based on a novel floating series-connection double-chamber structure for a balance gun, construction of an inner ballistic model is completed, and optimization design is conducted on the chamber structure and charging parameters. The problem that a large-diameter barrel weapon generates high bore pressure under the high initial speed index can be effectively solved. On the premise that the maximum chamber pressure is not increased, secondary acceleration of the projectile is achieved, and the outlet speed and the flight performance of the projectile are remarkably improved. According to the method, an important theoretical reference and a practical technical method are provided for design and development of the high-initial-speed large-caliber balance gun in the future, and the method has wide application prospects and great military value.

The utility model relates to the technical field of physical experiment auxiliary appliances, in particular to an intelligent horizontal projectile motion tester which comprises a base, a horizontal projectile track and a projectile body, the upper portion of the base is connected with a fixing rod, the bottom of the horizontal projectile track is provided with a photoelectric door sensor, the side face of the base is provided with a horizontal frame, and a contact sensor is installed inside a data collector. According to the intelligent horizontal projectile motion tester, horizontal projectile data of projectiles at different heights are tested through the movable horizontal projectile track, the data collector and the scale marks, the projectiles do horizontal projectile motion after passing through the photoelectric door sensor, the experimental data are automatically recorded by the data collector, and the data are displayed on the display screen in real time; the accuracy of data is improved, the data collector and the computer can be connected through a USB Type-C data line to transmit data, meanwhile, wireless transmission of the data collector and the computer is achieved through the Bluetooth module, combined analysis of multiple sets of data is facilitated, and the intelligent level of the horizontal projectile motion experiment is improved.

This invention provides an integrated demonstration device for the isochronous propagation of projectile motion, comprising a base plate and a rotating frame. The rotating frame is rotatably connected to the base plate. A handle is provided on one side of the rotating frame, with the connection between the rotating frame and the base plate as the boundary, and a cylindrical assembly is provided on the other side. An end seat is also provided on the side of the base plate with the cylindrical assembly, and a cylinder is mounted on the end seat. A channel is provided on the base plate to allow a small ball in the cylinder to fall freely. This invention enables flexible changes in the initial velocity of the projectile, overcoming the limitation of fixed initial velocity in existing devices. It can intuitively demonstrate that "projectile motion and free fall with different initial velocities land simultaneously" and "the isochronism between projectile motion and uniform linear motion with a constant initial velocity," directly verifying that "the time of projectile motion is independent of the initial velocity," thus overcoming the limitation of existing devices that cannot compare motions simultaneously.

The application discloses a water-based parallel projectile interference force analysis method based on cavitation effect, which comprises the following steps: establishing two identical projectile three-dimensional geometric models; introducing the models into a fluid solver to perform mesh division and boundary condition setting. Boundary layer meshes are divided on the projectile surface to capture complex flow phenomena near the wall surface; the models are introduced into a structure solver to perform mesh division and define material properties; monitoring points are set, initial working conditions of the projectiles are given, and numerical solution is performed; and the motion equation of each parallel projectile during water movement is analyzed by using a formula. A cavity interaction model containing the influence of a Weber number is established to obtain coupling forces in the projectile motion equation; a boundary element method is used to quickly reconstruct a flow field, and flow field velocity potential is calculated to obtain the force generated by the cavity combination; and the drag of the projectile is calculated, so that the motion equation of the projectile is solved, and the motion state of the projectile is obtained. The application can analyze the interference force on the projectile.

The application discloses a high-speed multi-projectile parallel water-entry stability analysis method, which comprises the following steps: determining core parameters affecting water-entry stability; using the core parameter group as a modeling base matrix to establish a projectile flow-solid two-phase calculation domain, dividing the calculation domain grid, setting fluid domain initial and boundary conditions, setting solid material properties and initial working conditions, and performing simulation to obtain the determination of whether the projectile is unstable, and combining existing data to construct a core input parameter matrix; normalizing the data of the core input parameter matrix, dividing the training set and the verification set, using a DNN neural network, defining the core input parameter matrix of the training set as an input parameter, defining the stability state of the later projectile as an output result, and establishing a plurality of fully connected neural networks therebetween; and verifying the trained neural network with the verification set. The application can provide certain help for projectile motion stability determination.

The invention relates to a multilayer concrete penetration trajectory prediction method fusing physical information CNN (Convolutional Neural Network). Comprising the following steps: constructing a single-layer concrete target penetration data set; constructing and training a deep learning network single-layer target prediction model fused with a physical mechanism; the trained single-layer target prediction model is used for single-layer target penetration prediction, and motion state parameters after a projectile body penetrates through the ith layer of target are predicted; establishing a missile body inter-target free flight model; for given multi-layer interval concrete target configuration and projectile body initial conditions, the post-target motion state parameters of the ith layer of target are input into the projectile body inter-target free flight model, and projectile-target intersection condition parameters before a projectile body impacts the (i + 1) th layer of target are obtained through calculation; inputting the missile-target intersection condition parameters and missile body and target body parameters into a single-layer target prediction model, and predicting motion state parameters after the missile body penetrates through the (i + 1) th layer of target; and circulating until the final projectile body motion state is predicted. According to the method, the multi-layer interval concrete target trajectory prediction model meeting engineering requirements is obtained.

A system is provided that includes an imaging system used to obtain images of one or more solids extracted from a reservoir during a projectile motion of the one or more solids, a processing circuitry, and a memory, accessible by the processing circuitry, the memory storing instructions that, when executed by the processing circuitry cause the processing circuitry to perform operations. The operations include controlling the imaging system to obtain the images of the one or more solids during the projectile motion and obtaining one or more physical properties of the one or more solids based on the images of the one or more solids during the projectile motion.

A system is provided that includes an imaging system used to obtain images of one or more solids extracted from a reservoir during a projectile motion of the one or more solids, a processing circuitry, and a memory, accessible by the processing circuitry, the memory storing instructions that, when executed by the processing circuitry cause the processing circuitry to perform operations. The operations include controlling the imaging system to obtain the images of the one or more solids during the projectile motion and obtaining one or more physical properties of the one or more solids based on the images of the one or more solids during the projectile motion.