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CN-121994296-A - System and method for detecting projectile parameters of Hopkinson bar

CN121994296ACN 121994296 ACN121994296 ACN 121994296ACN-121994296-A

Abstract

The invention relates to the technical field of mechanical property testing of materials, in particular to a system and a method for detecting parameters of a pill of a Hopkinson rod, wherein the parameter detection system comprises a detection module, a magnetic identifier and a signal acquisition processing unit, at least two detection modules are arranged at intervals, each detection module comprises an induction coil annular structure and a static magnetic field annular structure, the static magnetic field annular structure is coaxially arranged outside the induction coil annular structure, the induction coil annular structure comprises a plurality of quadrant partitions arranged at intervals along the circumference, each quadrant partition is provided with a plurality of coils, the time of the pill passing through different detection modules is acquired through the signal acquisition processing unit, the flying speed of the pill is acquired through the distance of the detection module, the rotation state and the coaxial posture of the pill are acquired through the signals generated by each quadrant partition when the pill passes through each detection module, and the parameter detection method can finish multi-parameter synchronous detection in a non-contact mode, is not limited by the pill structure, the universality is higher, and the reliability is better.

Inventors

  • XU JIE
  • CAI YANG
  • DENG YUJIE
  • LI XUHANG
  • FAN DUAN

Assignees

  • 中物院成都科学技术发展中心

Dates

Publication Date
20260508
Application Date
20251219

Claims (10)

  1. 1. A hopkinson bar shot parameter detection system comprising: The detection module (1), at least two detection modules (1) are arranged at intervals along the shot (5) transmitting direction, the detection modules (1) are provided with through detection channels (2), the detection modules (1) comprise an induction coil annular structure (3) and a static magnetic field annular structure (4), the static magnetic field annular structure (4) is coaxially arranged outside the induction coil annular structure (3), the induction coil annular structure (3) comprises a plurality of quadrant subareas (33) arranged at intervals along the circumference, and each quadrant subarea (33) is provided with a plurality of coils; -a magnetic marker (51), the magnetic marker (51) being arranged on a projectile (5), the projectile (5) being driven through the detection channel (2) by a hopkinson rod (6); the signal acquisition processing unit (7), the signal acquisition processing unit (7) is used for receiving and processing signals generated by triggering when the projectile (5) passes through the detection module (1).
  2. 2. A hopkinson bar shot parameter detecting system as claimed in claim 1, characterized in that the induction coil loop structure (3) comprises a full loop coil assembly (31) and a partition coil assembly (32), the full loop coil assembly (31) being located between the hopkinson bar (6) and the partition coil assembly (32), the full loop coil assembly (31) being uniformly wound with coils, the partition coil assembly (32) being wound with coils in the quadrant partitions (33).
  3. 3. A hopkinson bar shot parameter detecting system according to claim 1, characterized in that the static magnetic field ring structure (4) comprises ring-shaped permanent magnets.
  4. 4. A hopkinson bar shot parameter detecting system according to claim 1, characterized in that the shot (5) comprises an aluminium bar member or an iron bar member.
  5. 5. A hopkinson rod shot parameter detecting system according to claim 1, characterized in that the diameter of the shot (5) is 6-50mm, the speed of the shot (5) is 5-40m/s.
  6. 6. The hopkinson bar shot parameter detecting system according to claim 2, characterized in that the signal acquisition processing unit (7) comprises a controller and a hardware reconfigurable operation module, the signal acquisition processing unit (7) being configured to acquire a time signal of the shot (5) passing the detecting module (1), a trigger pulse signal of the shot (5) passing the full loop coil assembly (31) and several output voltage signals and spike signals generated by the shot (5) passing the partition coil assembly (32).
  7. 7. A method for detecting the parameters of a hopkinson rod projectile, characterized in that a hopkinson rod (6) projectile (5) parameter detecting system according to any one of claims 1-6 is used, and comprising the steps of: S1, determining the distance L between the detection modules (1), and acquiring the time when the projectile (5) passes through the first detection module (1) The time of any one of the detection modules (1) after the passage of the projectile (5) -Determining the flying speed of the projectile (5) by calculation; S2, acquiring an output voltage signal of the induction coil annular structure (3) when the projectile (5) passes - , Is that The serial numbers of the clockwise sequential numbers of the quadrant subareas (33) are calculated and determined to determine the offset coordinates, the eccentric distance and the offset direction of the projectile (5); s3, acquiring the time difference of spike pulse signals generated when the projectile (5) passes through the first induction coil annular structure (3) and any induction coil annular structure (3) after the first induction coil annular structure The spin speed and direction of rotation of the projectile (5) are determined.
  8. 8. The method for detecting the parameters of the projectiles of the hopkinson bar according to claim 7, characterized in that the flying speed of the projectiles (5) is satisfied: ; in the formula, Is the flying speed of the projectile (5); Is the spacing of the two full loop coil assemblies (31); for the time of flight of the projectile (5) between the two detection modules (1), 。
  9. 9. The method for detecting the parameters of the projectiles of the hopkinson rod according to claim 7, wherein the offset coordinates of the projectiles (5) are [ ] , ) The method meets the following conditions: ; ; in the formula, The magnetic mark (51) on the projectile (5) is offset in the X direction; The magnetic mark piece (51) on the projectile (5) is offset in the Y direction; Is the included angle of two adjacent quadrant subareas (33); for the number of quadrant divisions (33); Is that A serial number for clockwise sequential numbering of the quadrant partitions (33); Is the first Output voltage signals of the induction coil annular structure (3) acquired by the quadrant partitions (33); The eccentric distance The method meets the following conditions: ; in the formula, An inner ring radius of the induction coil ring structure (3); The direction of the offset The method meets the following conditions: 。
  10. 10. the method for detecting a shot parameters of a hopkinson rod as set forth in claim 9, wherein the rotation speed is The method meets the following conditions: , in the formula, For the shot (5) to pass through the rotation angle between the two detection modules (1), ; Is the time difference of the spike signal.

Description

System and method for detecting projectile parameters of Hopkinson bar Technical Field The invention relates to the technical field of material mechanical property testing, in particular to a system and a method for detecting shot parameters of a Hopkinson bar. Background The hopkinson bar (SHPB) is core equipment for researching the high strain rate dynamic mechanical properties of materials, and the accurate control of shot emission parameters is important to ensuring experimental reliability. The existing detection method of the shot emission parameters of the Hopkinson pole mainly comprises a laser interruption method, a contact type wire method, a single-coil electromagnetic induction method and the like, wherein the laser interruption method calculates the speed of the shot through the time difference of the shot passing through two laser beams, the contact type wire method triggers a passing signal through the shot contacting with a wire to cause short circuit, and the single-coil electromagnetic induction method determines the passing time of the shot through electromagnetic induction. In the Hopkinson bar experiment, the projectile is required to strike the incident bar at the speed of 5-40 m/s, stress wave eccentricity is avoided, the deviation of the projectile posture caused by centrifugal force is prevented, and the direct contact of the projectile is avoided to interfere with the experiment process, so that the speed, the rotation state and the coaxial posture of the projectile are required to be detected, but the synchronous high-precision detection of multiple parameters is difficult to realize in the existing method for detecting the shot emission parameters of the Hopkinson bar. Disclosure of Invention The invention aims to overcome the defect that the existing method for detecting the shot emission parameters of the Hopkinson bar is difficult to realize multi-parameter synchronous high-precision detection in the prior art, and provides a system and a method for detecting the shot parameters of the Hopkinson bar. In a first aspect, the present invention provides a shot parameter detection system for a hopkinson rod, comprising: The detection module is arranged at intervals along the projectile launching direction, is provided with a through detection channel and comprises an induction coil annular structure and a static magnetic field annular structure, the static magnetic field annular structure is coaxially arranged outside the induction coil annular structure, the induction coil annular structure comprises a plurality of quadrant subareas arranged at intervals along the circumference, and each quadrant subarea is provided with a plurality of coils; The magnetic identification piece is arranged on a projectile, and the projectile is driven to pass through the detection channel through a Hopkinson bar; The signal acquisition processing unit is used for receiving and processing signals generated by triggering when the projectile passes through the detection module. Preferably, the induction coil ring structure comprises a full-loop coil assembly and a partition coil assembly, the full-loop coil assembly is located between the hopkinson bar and the partition coil assembly, the full-loop coil assembly is uniformly wound around the coil, and the partition coil assembly is used for winding the coil according to the quadrant partition. Preferably, the static magnetic field ring structure comprises a ring-shaped permanent magnet. Preferably, the projectile comprises an aluminium rod member or an iron rod member. Preferably, the diameter of the pellets is 6-50mm, and the speed of the pellets is 5-40m/s. Preferably, the signal acquisition processing unit comprises a controller and a hardware reconfigurable operation module, and is configured to acquire a time signal of the shot passing through the detection module, a trigger pulse signal of the shot passing through the full-loop coil assembly, and a plurality of output voltage signals and spike pulse signals generated by the shot passing through the partition coil assembly. In a second aspect, the present invention provides a method for detecting a shot parameter of a hopkinson rod, using a hopkinson rod shot parameter detecting system as described above, and comprising the steps of: s1, determining the distance L between the detection modules, and obtaining the time when the projectile passes through the first detection module The time of any one of the detection modules after the passing of the projectileCalculating and determining the flying speed of the projectile; s2, acquiring an output voltage signal of the induction coil annular structure when the projectile passes -,Is thatThe serial numbers of the clockwise sequential numbers of the quadrant subareas are calculated and determined to determine the offset coordinates, the eccentric distance and the offset direction of the projectile; S3, obtaining the time difference of spike pulse signals