CN109596855B - Method for testing initial velocity and acceleration of projectile body outlet - Google Patents
Method for testing initial velocity and acceleration of projectile body outlet Download PDFInfo
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- CN109596855B CN109596855B CN201811611280.4A CN201811611280A CN109596855B CN 109596855 B CN109596855 B CN 109596855B CN 201811611280 A CN201811611280 A CN 201811611280A CN 109596855 B CN109596855 B CN 109596855B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/16—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by evaluating the time-derivative of a measured speed signal
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Abstract
The invention belongs to the field of signal measurement, and particularly relates to a method for measuring initial speed and acceleration of an outlet of a projectile by utilizing on-off of a cable on the projectileA method of speed. A method for testing the initial velocity and the acceleration of an outlet of a projectile body comprises a launching device and the projectile body, wherein the launching device is connected with the projectile body through a test cable group, the test cable group comprises a plurality of test cables, and connectors are arranged on the test cables; the test cable group comprises a time zero point line, a signal line and a ground line; the length of the signal wire is equal to the distance between the test position point and the boring outlet; the distance from the test position point to the boring hole is S1; namely, the length of the signal line L1 is S1; the signal line off time is denoted as t 1; the length of the time zero point line M1 is S1-sigma; the length of the ground wire N1 is S1+ sigma; wherein sigma is S1/10; namely, it is
Then the process of the first step is carried out,
the speed and the acceleration of the outlet direction are calculated by the projectile body, and the calculation result is directly used for participating in calculation of the attitude and the position of the projectile body in real time.
Description
Technical Field
The invention belongs to the field of signal measurement, and particularly relates to a method for measuring initial speed and acceleration of an outlet of a projectile by utilizing on-off of a cable on the projectile.
Background
With the development of modern electronic technology, various high-precision guidance ammunitions are rapidly developed. However, the initial velocity and acceleration of the exit of many guided munitions is large and is an indeterminate value influenced by a number of factors. Because the projectile body is axially and greatly overloaded at the moment of launching, the existing sensor has the defects of unavailable measuring range or resolution, so that the projectile body cannot be directly and accurately tested to obtain the self outlet speed and acceleration, and has to be compensated by other means. Therefore, an indirect test method is usually adopted, namely, a proper test method is adopted from the ground to obtain the initial speed, and then the bound bullet is fed.
The existing ground test initial speed methods include a radar speed measurement method, a sky screen target speed measurement method, a coil target speed measurement method, a light screen target speed measurement method, a high-speed video recording method and the like. The methods are generally high in cost, initial speed information is obtained from the ground, accuracy can be guaranteed, but the method can only be used on the ground, and ammunition cannot be obtained in real time. The method designed herein, which is directly derived from the ammunition itself testing, can be used in real time without the need for surface equipment to participate, and is not comparable to the above-mentioned method.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for calculating the speed and acceleration of a projectile body within a range that the movement of the projectile body can be simplified into linear movement within a certain time after the projectile body is launched. The method is suitable for single-shot ammunition.
The technical scheme of the invention is as follows:
a method for testing the initial velocity and the acceleration of an outlet of a projectile body comprises a launching device and the projectile body, wherein the launching device is connected with the projectile body through a test cable group, the test cable group comprises a plurality of test cables, and connectors are arranged on the test cables; the test cable assembly is disconnected from the connector connection when tension is applied. The release force is small and does not affect the launch of the projectile. The forward movement of the projectile drives the connectors apart.
The test cable group comprises a time zero point line, a signal line and a ground line;
the signal line L1 has a length S1; the signal line off time is denoted as t 1;
the length of the time zero point line M1 is S1-sigma;
the length of the ground wire N1 is S1+ sigma; wherein sigma is S1/10;
the ground line is the longest line, so as to ensure that the ground line is disconnected finally, and a ground loop can be provided for an interrupt signal generated when the signal line is disconnected. The time zero line is shortest to ensure that the signal line is disconnected firstly, and a time zero can be provided for the signal line. The length of the signal wire is centered, so that the signal can be generated and reliably sent to the signal acquisition and processing unit only after the time zero point is established, and the moment when the signal wire is disconnected can be captured in time.
The signal acquisition and processing unit effectively processes a series of interrupt signals generated when each test cable on the cable is disconnected in time, and calculates the instantaneous speed and the acceleration of a given position point.
The specific process is as follows:
before the ammunition is sent: connecting a time zero point line M1 and a signal line L1 to an IO port of the signal acquisition and processing unit, and initializing parameters;
after the ammunition is sent: parameters of the IO port change sequentially along with time;
when the time zero point line M1 is disconnected, the time is t0 and is marked as the time zero point; i.e., t0 ═ 0;
when the ammunition reaches S1, a signal line L1 is disconnected, the time is recorded as t1, and the speed is recorded as V1;
namely, it is
Then the process of the first step is carried out,
when the distance from the projectile body testing position point to the boring outlet is Sn and Sn is greater than S (n-1), taking the moment of S (n-1) as a starting point; making Mn equal to M (N-1), Nn equal to N (N-1), and making Ln have the length of Sn + sigma;
namely, it is
Acceleration at S2
The precision of the signal acquisition and processing unit is more than or equal to 0.05 m/s.
The model of the signal acquisition and processing unit is TMS320C 6455.
The invention has the technical effects that:
1. the speed and the acceleration in the outlet direction are calculated by the projectile body instead of the ground, and the calculated result is directly used for participating in calculation of the attitude and the position of the projectile body in real time;
2. the accuracy can be determined by itself. Proper cable length, response of the on-board signal acquisition and processing unit and calculation speed are selected, and proper precision can be achieved. The faster the on-board signal acquisition and processing unit is, the higher the speed precision of the obtained projectile body is;
3. the stability is good. Does not change with the change of temperature and air pressure.
Drawings
FIG. 1 is a schematic view of the structural connection of the present invention.
FIG. 2 is a timing diagram of a cable disconnection process according to the present invention.
Fig. 3 is a schematic diagram of the interconnection of cables according to the present invention.
Detailed Description
Example 1-test site distance from boring outlet S1.
(1) Arranging a test cable;
the length of the time zero point line M1 is S1-sigma; the length of the signal line L1 is S1; the length of the ground wire N1 is S1+ sigma; wherein the content of the first and second substances,
that is, during the projectile firing process, the time zero point line M1 is the shortest, and therefore opens earliest, and thus the signal line L1 opens, and finally the ground line N1 opens.
(2) Initializing;
connecting a time zero point line M1 and a signal line L1 to an IO port of the on-board signal acquisition and processing unit; the signal acquisition and processing unit records that the distance from the test position point to the boring outlet is S1; the initial IO port state is 0x 00; the projectile body is electrified, and the signal acquisition and processing unit is in a working state.
(3) After the ammunition is fired, when the time zero point line M1 is disconnected, the time is t0 and is marked as time zero point; i.e., t0 ═ 0;
when the emission position reaches S1, the signal wire is disconnected, the time is recorded as t1, and the speed is recorded as V1; the state of the IO port is 0x 10;
when the ground wire is disconnected, the time is recorded as t2, and the O port state at the time of t2 is 0x 11;
namely, it is
Then the process of the first step is carried out,
example 2-test site distance from boring outlet S2.
There are two methods:
method 1-reference example 1
The length of the time zero point line M2 is S2-sigma; the length of the signal line L2 is S2; the length of the ground wire N2 is S2+ sigma; wherein the content of the first and second substances,
the subsequent portions are the same as in example 1.
Method 2-starting from the time of S1, let M2 be M1, N2 be N1, and let L2 be S2+ σ;
namely, it is
Acceleration at S2
Example 3-test site distance from boring outlet Sn.
When the distance from the projectile body testing position point to the boring outlet is Sn and Sn is greater than S (n-1), taking the moment of S (n-1) as a starting point; making Mn equal to M (N-1), Nn equal to N (N-1), and making Ln have the length of Sn + sigma;
namely, it is
Acceleration at S2
Claims (4)
1. A method for testing the initial velocity and acceleration of an outlet of a projectile body is characterized in that: the device comprises a launching device and a projectile body, wherein the launching device is connected with the projectile body through a test cable group, the test cable group comprises a plurality of test cables, and connectors are arranged on the test cables;
the test cable group comprises a time zero point line, a signal line and a ground line;
the length of the signal wire is equal to the distance between the test position point and the boring outlet; the distance from the test position point to the boring hole is S1; namely, the length of the signal line L1 is S1; the signal line off time is denoted as t 1;
the length of the time zero point line M1 is S1-sigma;
the length of the ground wire N1 is S1+ sigma; wherein sigma is S1/10;
the specific process is as follows:
before the ammunition is sent: connecting a time zero point line M1 and a signal line L1 to an IO port of the signal acquisition and processing unit, and initializing parameters;
after the ammunition is sent: parameters of the IO port change sequentially along with time;
when the time zero point line M1 is disconnected, the time is t0 and is marked as the time zero point; i.e., t0 ═ 0;
when the ammunition reaches S1, a signal line L1 is disconnected, the time is recorded as t1, and the speed is recorded as V1;
namely, it is
Then the process of the first step is carried out,
2. the method of testing projectile exit initial velocity and acceleration according to claim 1 wherein: when the distance from the projectile body testing position point to the boring outlet is Sn, and Sn is larger than S (n-1), taking the moment of S (n-1) as a starting point;
making Mn equal to M (N-1), Nn equal to N (N-1), and making Ln have the length of Sn + sigma;
namely, it is
Acceleration at Sn
3. The method of testing projectile exit initial velocity and acceleration according to claim 2 wherein: the precision of the signal acquisition and processing unit is more than or equal to 0.05 m/s.
4. The method of testing projectile exit initial velocity and acceleration according to claim 3 wherein: the model of the signal acquisition and processing unit is TMS320C 6455.
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| BE754626A (en) * | 1969-08-12 | 1971-01-18 | Oerlikon Buehrle Ag | INSTALLATION DETERMINING THE INITIAL SPEED OF A PROJECTILE |
| DE2754420C3 (en) * | 1977-12-07 | 1980-10-09 | Dr. Johannes Heidenhain Gmbh, 8225 Traunreut | Ballistic measuring arrangement |
| US4542342A (en) * | 1982-09-15 | 1985-09-17 | The United States Of America As Represented By The Secretary Of The Army | Apparatus for measuring projectile's transverse displacement at gun muzzle |
| EP0108973B1 (en) * | 1982-11-10 | 1987-01-07 | Werkzeugmaschinenfabrik Oerlikon-Bührle AG | Apparatus for measuring the muzzle velocity of a projectile fired by a weapon |
| DE3307785A1 (en) * | 1983-03-04 | 1984-09-06 | Deutsch-Französisches Forschungsinstitut Saint-Louis, Saint-Louis | METHOD AND DEVICE FOR SETTING A FLOOR TIMER |
| DE3431634C1 (en) * | 1984-08-29 | 1986-03-13 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | Method and device for producing a signal when a body passes through a contact film |
| FR2574929B1 (en) * | 1984-12-14 | 1987-01-16 | Commissariat Energie Atomique | DEVICE FOR DYNAMICALLY MEASURING PARAMETERS RELATED TO SMALL DIMENSION PROJECTILES |
| CN1033718C (en) * | 1992-12-30 | 1997-01-01 | 南京理工大学 | Air gun pellet initial speed measuring device |
| KR100866393B1 (en) * | 2006-12-15 | 2008-11-03 | 경상대학교산학협력단 | In-plane scanning PIV method |
| DE102009030862B3 (en) * | 2009-06-26 | 2010-11-25 | Rheinmetall Air Defence Ag | Method and device for measuring the muzzle velocity of a projectile or the like |
| CN101865932A (en) * | 2010-06-18 | 2010-10-20 | 南京理工大学 | Speed measuring and positioning method of single-row light source Z-type reflected light screen targets |
| IL211142A (en) * | 2011-02-09 | 2015-06-30 | Yesaiahu Redler | System and method for measuring parameters of motion of a projectile as it exits the muzzle of a gun |
| CN103575926B (en) * | 2013-11-21 | 2016-03-30 | 中北大学 | Be applicable to the muzzle velocity method for real-time measurement of the micro-inertial navigation system of high overload bullet |
| CN103760379B (en) * | 2013-12-20 | 2017-01-25 | 西安工业大学 | Correction and test system and method for miss distance of large target surface |
| CN108445253B (en) * | 2018-03-29 | 2023-07-14 | 中北大学 | High-spin projectile rotating speed testing device and method based on orthogonal double geomagnetic coils |
| CN108426526B (en) * | 2018-05-09 | 2021-01-05 | 西安工业大学 | Space multi-target vertical target parameter testing device and testing method |
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