14 results about "Internal ballistics" patented technology

The application discloses a kind of artillery barrel residual life prediction method, to the interior ballistic parameter obtained in artillery shooting process as foundation, in the process of each ammunition launch, the pressure of the bottom of the shell and the movement speed of the projectile at multiple discrete time points in the movement stage of the barrel are collected in real time, and the integrated feature vector for representing single shot process is constructed in combination with artillery state information, based on integrated feature vector, single wear prediction model based on BP neural network is constructed and trained, after model training is completed, the wear of barrel caused by each shot is predicted using single wear prediction model, and the degradation state of barrel is dynamically updated through wear accumulation mechanism, in combination with the preset barrel wear failure threshold, the wear evolution in the subsequent shooting process of artillery barrel is forwardly predicted, and then the residual available firing number of artillery barrel is obtained, to realize the quantitative evaluation of residual life.

The invention discloses a method for analyzing the reliability of a gunpowder igniter in a low-temperature ignition failure mode, which comprises the following steps of: firstly, carrying out characterization analysis on the ignition failure mode of the gunpowder igniter in a low-temperature environment, identifying main uncertain factors influencing the low-temperature ignition reliability by adopting a fault tree method (FTA), and determining the probability distribution characteristic of the main uncertain factors; then, an implicit performance function of the failure mode is established. In order to clarify a deterministic relationship between a performance parameter and a design variable, an inner ballistic simulation model for low-temperature ignition of a gunpowder igniter is constructed based on an inner ballistic theory, and a Kriging agent model is further established by using the simulation model. And finally, sampling and solving the Kriging model through an MCS method (Monte Carlo simulation) to obtain the failure probability and reliability of the low-temperature ignition failure mode of the gunpowder igniter. The reliability of the gunpowder igniter under the low-temperature condition can be accurately evaluated, and a theoretical basis is provided for product improvement design.

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.

This invention belongs to the field of commercial aerospace and solid rocket engine performance optimization, and discloses a low-cost dynamic envelope inference method based on neural networks. The method includes: establishing a geometric model characterized by feature parameters for each propellant type; constructing a training sample dataset for each propellant type based on the feature parameters at a first scale, and calculating the burn surface area sequence and free volume sequence of each training sample as labels using the burn surface shift step size; training a first neural network and a second neural network for each propellant type using the training samples; constructing a prediction sample dataset for each propellant type at a second scale, and obtaining the result for each prediction sample using the corresponding first and second neural networks; constructing an engine thrust calculation model by combining zero-dimensional internal ballistic equations and one-dimensional steady isentropic flow theory, and calculating the engine thrust for each prediction sample, thereby obtaining the rocket engine dynamic envelope corresponding to each propellant type.

This invention discloses a one-dimensional internal ballistic calculation method for multi-propellant rocket engines that considers differences in gas properties. The method includes: establishing a physical model of a solid rocket motor; establishing a transient control equation set to calculate the density of the mixed gas, combustion chamber temperature, gas velocity, and combustion chamber pressure at the next time step; obtaining the remaining gas volume of different propellants at the next time step; updating the weighted average of physical property parameters; calculating the burning rate and burning surface area at the next time step; repeating the above operations until the propellant grain is completely burned out, thus completing the one-dimensional internal ballistic calculation. This invention considers the mixing process of gases generated by different propellants during the combustion of a mixed-charge solid rocket engine, resulting in accurate calculation results.

A ballistic detection system includes a projectile detector; electromagnetic radiation detection equipment; and a ballistics analysis computer configured to obtain image data captured by first and second cameras in accordance with timing specified by the projectile detector, determine points in three-dimensional space, which correspond to image artifacts of a projectile, using intrinsic and extrinsic parameters of the first and second cameras, define a trajectory of the projectile within a target volume using the points in three-dimensional space, and optionally find a point of intersection of the trajectory of the projectile with an object associated with the target volume.

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 present application provides a kind of gas actuator interior ballistic analytical calculation method considering leakage, steps are as follows: step 1: gas actuator interior ballistic mathematical model establishment: step 2: gas actuator pressure characteristic analytical solution calculation: step 3: gas actuator work characteristic analytical solution calculation.The gas actuator interior ballistic state parameter calculation method provided by the present application can be used for the evaluation and optimization of the overall design stage of gas actuator, and improves the design efficiency.By analytical solution, the influence of gunpowder gas leakage on the output characteristics of gas actuator is corrected, and it is no longer constrained by the mass conservation assumption, thereby improving the accuracy of interior ballistic prediction results.Gas actuator output characteristics are directly calculated by analytical formula, without using numerical method to integrate and solve the entire working process, which significantly reduces the calculation time.

The present application relates to ammunition technical field, especially a kind of full shape blank cartridge for completing disintegration after projectile ejection by launching energy, it is composed of launching charge and projectile, the projectile includes bullet body, wind cap, pressure limiting sheet and counterweight filling;The bullet body is the structure of the cylinder with one end sealed and the other end open, it is equipped with fire hole in sealed end, the fire hole is covered by pressure limiting sheet on the outside of sealed end, and the sealed end is partially assembled in launching charge, the open end of bullet body is buckled with wind cap;The counterweight filling is filled in the inner cavity of bullet body.The present application relies on the structural design of projectile to ensure that it has similar interior ballistic performance with standard product during shooting, and the sensory experience is basically consistent with live ammunition shooting, it can be used for training soldiers to master the basic shooting action of grenade launcher, also can be used for live exercise, fill the blank of grenade on blank cartridge;The projectile does not contain any dangerous sensitive material such as explosive, no explosion danger.

This invention discloses a discrete pulse timing fitting control method for a complex power source series catapult launch, capable of controlling the mass flow rate of multiple small pulse engines. The method achieves consistency between the fitted mass flow rate curve and the theoretical fitting result, maintaining constant overload and stable operation of the missile during launch. The method includes the following steps: Step 1: Solve for the ideal overload using internal ballistics knowledge based on the required missile parameters. Step 2: Obtain the ideal pressure according to the dynamic equations. Step 3: Substitute the ideal pressure into the control equations to obtain the ideal engine mass flow rate. Step 4: Determine whether the interpolation between the ideal engine mass flow rate and the actual mass flow rate meets the requirements. If yes, return to Step 2; otherwise, proceed to Step 5. Step 5: Open a new release point; calculate the actual mass flow rate, and return to Step 2.

The invention provides a device and method for continuously measuring the inner ballistic velocity of a two-stage light-gas gun, the device comprises a gas chamber, a pump pipe, a piston arranged in the pump pipe, a transmitting pipe located at the front end of the pump pipe, a measuring assembly, bulletproof glass, a data collector and a controller, the measuring assembly comprises a first laser displacement sensor and a second laser displacement sensor, the first laser displacement sensor is installed at the front end of the piston, the second laser displacement sensor is located in front of the transmitting tube, displacement data of the piston and the projectile can be measured in real time, and motion parameters of the piston and the projectile can be accurately obtained. According to the invention, the continuous change process of the inner ballistic parameters in the ultra-high-speed launching process of the secondary light-gas gun can be accurately measured under the closed condition, the time sequence synchronous recording of the inner ballistic parameters of the piston and the projectile is ensured, and the motion state of the piston and the projectile at any moment can be obtained.

This invention discloses a silent mortar shell and its usage method. The shell includes a projectile (1), a tail tube (2), a piston (3), a tail fin (4), and a main charge (5). The piston (3) is provided with a projectile belt (6), a primer (7), and a ignition tube (8). The projectile belt (6) is located outside the piston (3). The front part of the inner cavity of the tail tube (2) is provided with a bevel (9), and the rear part is provided with a tail cone (10). The surface of the bevel (9) gradually narrows from front to back, and the inner surface of the tail cone (10) gradually narrows from front to back. The projectile belt (6) is initially stuck at the bevel (9). The space between the piston (3) and the projectile (1) forms a chamber (11). The main charge (5) is located in the chamber (11). After the primer (7) is fired, it can ignite the main charge (5) through the ignition tube (8). The tail fin (4) is connected to the rear part of the tail tube (2). This invention provides starting pressure through the cooperation of the cartridge belt and the breech bore, ensuring internal ballistic performance and enabling silent, smokeless, and lightless firing.

1. The name of the design product: the target of the sky screen. 2. The use of the design product: for the collection of the muzzle velocity of the gun interior ballistic parameter. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: the perspective view.

This invention belongs to the field of commercial aerospace and solid rocket optimization, and discloses a solid rocket trajectory optimization design method based on internal ballistic parameterization modeling. The method includes: determining the structural and energy characteristic parameters of the solid rocket motor; designing different types of propellant grains and constructing their geometric models; determining the internal ballistic parameterization model of the motor; constructing a dynamic model for joint optimization of the internal and external trajectories of the solid rocket; based on the dynamic model, setting the optimization objective of the joint internal and external trajectory optimization problem and representing it with a performance index function, and setting the constraints of the joint internal and external trajectory optimization problem; discretizing the dynamic model, performance index function, and constraints, converting them into a nonlinear programming problem and solving it to obtain the optimization results corresponding to each type of propellant grain; determining the performance index corresponding to each type of propellant grain based on the optimization results, and using the performance index to determine the propellant grain as the optimal design scheme.