26 results about "Projectile motion" patented technology

The invention discloses a projectile trajectory prediction method based on a BiLSTM-KAN model under a small sample. The method is used for filling up missing information in a projectile trajectory. The method comprises the following steps: 1) establishing a six-degree-of-freedom projectile motion model for numerical simulation, and solving by using a fourth-order Runge-Kutta method, so as to construct a projectile trajectory simulation data set; 2) preprocessing the obtained projectile trajectory data set, constructing the preprocessed projectile trajectory data set into a supervision data set containing samples and labels, and dividing the data set into a training set and a test set; (3) a BiLSTM-KAN model is built; 4) carrying out training convergence on the BiLSTM-KAN model on the training set; and 5) finally, performing a projectile trajectory prediction experiment on the converged model on a test set.

The invention provides a liquid-gas phase change ejection inner trajectory modeling method, a liquid-gas phase change ejection simulation method and electronic equipment. A liquid-gas phase change ejection system comprises at least one phase change power unit. The liquid-gas phase change ejection inner trajectory modeling method comprises the step of dividing a liquid-gas phase change ejection inner trajectory into a phase change power unit flow model, a primary chamber energy model and a projectile body motion parameter model. According to the method, the liquid-gas phase change ejection inner ballistic model comprising the multiple phase change power units is constructed, the acting time of the phase change device is prolonged, the preset speed can be achieved when the ejection overload control requirement is high and the overload does not exceed the limit value, and the inner ballistic parameter change process in the carbon dioxide phase change ejection expansion acting process can be accurately calculated.

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.

The present invention proposes a method for calculating the interior ballistic characteristic parameters of a mixed charge under plasma ignition. The method includes determining the discharge parameters of a pulse power supply; establishing a formula for the gunpowder burning rate under plasma enhancement; determining the shape functions of two gunpowders; establishing a projectile motion equation and an electrothermal chemical launch interior ballistic equation; substituting the input electrical energy into the electrothermal chemical launch interior ballistic equation, combining the gunpowder burning rate formula and the shape function to perform a time-advancing solution, and finally using the projectile motion equation and the electrothermal chemical launch interior ballistic equation to obtain the internal pressure and projectile velocity curve during the projectile's discharge process. The present invention solves the problem of existing electrothermal chemical launch interior ballistic models that only consider a single charge structure, and can quickly and effectively calculate the internal pressure and projectile velocity curve during the discharge process of an electrothermal chemical launch projectile with a mixed charge structure.

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.

1. Name of the product in this design: Magnetic Water Flow Projectile Motion Machine. 2. Purpose of this design: An experimental instrument for demonstrating 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 present invention proposes a fast calculation method for the trajectory of a truncated oval projectile entering water, establishes a fixed coordinate system and a projectile coordinate system; establishes a 3DOF projectile motion equation and initial conditions in the projectile coordinate system; calculates the radius of the cavitation section of the truncated oval projectile entering water, and then obtains the upper vertex coordinates and lower vertex coordinates of each cavitation section in the plane of the fixed coordinate system; calculates the component model of the fluid dynamics of the projectile head in the projectile coordinate system, the resultant moment model of the fluid dynamics of the projectile head on the projectile mass center, the projectile wetted area model, the projectile tail sliding lift model, the projectile tail resultant moment model, the projectile tail friction calculation model, and the component model of the projectile mass center gravity in the projectile coordinate system; substitutes the calculation result of the projectile external force into the 3DOF projectile motion equation in the projectile coordinate system, and performs time advancement solution. The present invention can comprehensively obtain some details of the truncated oval projectile entering water, and the calculation speed is fast.

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 present invention discloses a popular science demonstration device and a demonstration system for horizontal projectile motion. The launching mechanism is used to horizontally launch a small ball, and the falling demonstration member is suspended on the frame and located on the horizontal launching path of the small ball; during the demonstration, the participant triggers the launching mechanism through interaction to horizontally eject the small ball, and at the same time the falling demonstration member drops, so that the participant can observe that the horizontally projected small ball can always meet the falling demonstration member, thereby guiding the audience to adopt the observation method and the comparison method, enabling the audience to understand the characteristics of horizontal projectile motion during the processes of observation, participation and exploration, popularizing popular science knowledge, and cultivating the spirit of exploration of the audience.

The utility model relates to the technical field of experiment teaching aids, and discloses a physics teaching aid for horizontal projectile motion demonstration, which comprises a water storage box, short plates are symmetrically and fixedly connected to the side walls of the water storage box, cylinders are fixedly connected to the tops of the short plates, movable columns are slidably connected to the inner walls of the cylinders, and a first circular ring is fixedly connected to the side walls of the two cylinders together. The inner wall of the second circular ring is fixedly connected with an experiment cylinder, the inner wall of the experiment cylinder is in sealed sliding connection with a piston, the side wall of the water storage box is fixedly communicated with a first long pipe, the side wall of the water storage box is fixedly connected with a water storage tank, and one end of the first long pipe is fixedly communicated with the side wall of the water storage tank; according to the utility model, when a user adjusts the height of the experiment cylinder, the height change before and after the adjustment of the experiment cylinder can be more visually observed according to the position change of the scale marks, so that a viewer can more conveniently know that the horizontal projectile motion is related to the height of a projectile point of the horizontal projectile motion.

The invention provides a multi-radar fusion method and system based on interactive model self-feedback learning, and the method mainly comprises the steps: constructing an interactive multi-model Kalman filter according to the flight characteristics of a guided projectile and radar performance constraints, and obtaining the fusion state estimation of each radar under different motion trajectories of the guided projectile; solving the strong correlation between the guided projectile and the multiple radars by adopting an approximate ideal solution sorting method based on the trajectory prediction information, obtaining the fusion weight of state estimation of each radar, and fusing the fusion state estimation of all radars; and feeding back a fusion result to the interactive multi-model Kalman filter, carrying out adaptive learning, and optimizing state estimation of the Kalman filter. The method is suitable for measuring the motion parameters of the guided projectile based on multiple radars in a high-dynamic environment.

The invention relates to a projectile velocity prediction method and system for an electromagnetic thruster, and the method comprises the steps: S1, building a turn number relation of a drive coil corresponding to the projectile velocity by taking the acceleration, obtained on the axis of the drive coil, of a projectile in a solenoid as a reference; s2, correcting the turn number relation of the driving coil corresponding to the projectile velocity; and S3, based on the turn number relation of the drive coil corresponding to the corrected projectile speed, obtaining a relation curve of the projectile speed and time, and predicting the motion speed of the projectile under different matching relations according to the relation curve. The matching relation between the number of turns of the driving coil and the motion speed of the projectile is constructed, so that the projectile can ensure high kinetic energy and high efficiency in the acceleration process of the driving coil of each stage of the solenoid, and the acceleration effect of each stage can be predicted.

The invention discloses a correction method for flip bucket motion trail calculation and application thereof, and belongs to the field of flip bucket energy dissipation of release structures. According to the method, on the basis of ideal water body inclined projectile motion (only gravity is considered), the upper edge track and the lower edge track of the nappe are corrected through the resistance coefficient and the flip angle coefficient, the method is verified to be reasonable and feasible through a physical model test, the calculation process of the real nappe track is simplified, and the flexibility and rationality of flip flow energy dissipation building design are improved.

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.

The present invention discloses a method, device and electronic equipment for securing and protecting settings. By obtaining the vertical velocity deviation extreme value, horizontal velocity deviation extreme value, mass of the rocket body, length of the securing and protecting rope, and the vertical distance from the fixing point of the securing and protecting rope to the rocket body during the horizontal projectile motion of the rocket body; based on the above data, the target angle between the securing and protecting rope and the vertical direction when the rocket body lands and the rope load when the securing and protecting rope is taut when the rocket body lands are determined; according to the target angle between the securing and protecting rope and the vertical direction when the rocket body lands and the rope load when the securing and protecting rope is taut when the rocket body lands, the target load for securing and protecting is determined. This solution creatively considers the rocket body attitude under the emergency shutdown condition and the motion state of the rocket body after shutdown, determines the maximum load that the securing and protecting needs to bear, so as to match a suitable securing and protecting device. It lays a foundation for conducting reusable liquid rocket securing and protecting tests.

The present invention provides a liquid-gas phase-change catapult interior ballistics modeling method, simulation method, and electronic equipment. The liquid-gas phase-change catapult system of the present invention includes at least one phase-change power unit. The liquid-gas phase-change catapult interior ballistics modeling method includes dividing the liquid-gas phase-change catapult interior ballistics into a phase-change power unit flow model, an initial volume chamber energy model, and a projectile motion parameter model. The present invention constructs a liquid-gas phase-change catapult interior ballistics model comprising multiple phase-change power units. The phase-change device increases the operating time, which can achieve a predetermined speed without exceeding a limit when catapult overload control requirements are high. The method can also accurately calculate the changes in internal ballistic parameters during the expansion and operating process of a carbon dioxide phase-change catapult.

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.

The invention belongs to the technical field of storage tank safety testing, and particularly relates to a testing system and method for simulating fragment casting characteristics during leakage of a storage tank. The storage tank simulation device comprises a cylindrical stainless steel storage tank, a storage tank leakage opening is sequentially provided with an electromagnetic valve and a compression ring pore plate, the compression ring pore plate adjusts the size of the leakage opening, fragments abut against the compression ring pore plate, and after the electromagnetic valve is opened, jet flow acts on the fragments; the analysis processing unit processes the image data through an image recognition algorithm and reconstructs a three-dimensional motion trail of the fragment to obtain a state variable parameter of the fragment, combines a physical differential equation with a neural network when constructing a motion trail model, and parameterizes unknown items in the physical differential equation by using the neural network to obtain a motion trail model; and optimizing the trajectory in real time through a self-adaptive solver. Through fusion of a physical model and a machine learning algorithm, the physical interpretability of the motion track model can be ensured, complex nonlinear dynamics during debris casting can be captured, and the method is suitable for casting motion analysis in a real complex environment.

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.