CN108033034B - Method for testing speed of rocket pulley test - Google Patents
Method for testing speed of rocket pulley test Download PDFInfo
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- CN108033034B CN108033034B CN201711199983.6A CN201711199983A CN108033034B CN 108033034 B CN108033034 B CN 108033034B CN 201711199983 A CN201711199983 A CN 201711199983A CN 108033034 B CN108033034 B CN 108033034B
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- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to an aviation lifesaving rocket pulley test technology, in particular to a method for testing the speed of a rocket pulley test. The testing device comprises a vehicle-mounted signal acquisition memory, a magnetoelectric sensor and a permanent magnet, wherein the vehicle-mounted signal acquisition memory and the magnetoelectric sensor are installed on the trolley body, the permanent magnet is installed on the side edge of a track, the magnetoelectric sensor is respectively connected with the vehicle-mounted signal acquisition memory, and the vehicle-mounted signal acquisition memory is connected with a computer. According to the invention, 2 or more magnetoelectric sensors are arranged on the pulley along the course to form multi-point detection, and the measurement points respectively obtain the running speed data of the pulley, so that mutual backup can be realized, and the reliability of speed measurement work is improved; and further forming new distance difference and time difference along the course among the measuring points, thereby obtaining a higher-precision speed value in a shorter interval through differential calculation.
Description
Technical Field
The invention relates to an aviation lifesaving rocket pulley test technology, in particular to a method for testing the speed of a rocket pulley test.
Background
The development of the aviation ejection life-saving device needs a large number of rocket vehicle slide rail tests. In a rocket pulley test of the airborne ejection lifesaving device, a rocket engine pushes a pulley loaded with the ejection lifesaving device to run on a track, and the ejection lifesaving device is started to work when the pulley reaches a preset area. The running speed of the rocket pulley on the track needs to be tested to confirm the speed of the life saving device during ejection, verify, evaluate the performance of the rocket pulley trajectory and the like. The rail-mounted magnetic induction speed test method is applied in the test before. The rail-mounted magnetoelectric induction speed testing method is characterized in that a plurality of magnetoelectric sensors (4) are arranged at fixed points on one side of a rail (2), a magnet (3) is arranged on a pulley (1), when the pulley (1) and the magnet (3) sequentially pass through the magnetoelectric sensors (4), the magnetoelectric sensors generate series voltage change pulses sequentially due to Hall effect, the distance delta sn between the magnetoelectric sensors is measured, a data acquisition memory (6) acquires the time interval delta tn of a magnetoelectric sensor voltage pulse sequence, and therefore approximate pulley running speed V is calculated and obtained as delta sn/delta tn, and the method is shown in figure 1.
This test method has some of the following problems:
1) the power supply of the sensor is difficult: the sensor is fixedly installed on the ground along the track, the distance of a transmission line is too long, the power supply voltage and the signal attenuation are serious and difficult to stabilize, a plurality of power supply sources are required to be additionally arranged along the track, the test time and the manpower expenditure are increased by power-on monitoring before the test and power-off maintenance work after the test, and an ideal effect is difficult to obtain;
2) signal transmission channels are susceptible to interference: the device layout and the transmission cable are paved for several kilometers, the circuit is difficult to shield, external interference is easy to be mixed, and even normal signals are annihilated when the circuit is serious;
3) is greatly influenced by the environment: electronic devices and circuits are exposed in the field for a long time, and the system is damaged due to artificial factors such as lightning, high temperature, moisture, traffic and the like, so that the reliability is reduced, and the damage rate of the devices is high;
4) difficulty in installation and laying
600 magnetoelectric sensors are installed and welded on a track with the total length of 6km at a distance of 10m, the engineering quantity is large, and high requirements are provided for constructors, so that the engineering quality is difficult to ensure;
5) the maintenance is difficult: the maintenance, the joint test, the replacement and other work of the damaged electronic devices and cables are carried out on the lines which extend for several kilometers, and the great labor, material and time costs are often consumed;
6) the measurement accuracy and the speed-position correspondence are questioned: the pulley can calculate to obtain a speed parameter value at the midpoint of the approximate interval when reaching the end point of the interval, and the speed value is applied to ejection control during the ejection lifesaving rocket pulley test to cause large errors, namely the speed during ejection has poor correspondence degree with the speed value obtained by the test.
This approach exposes some testing accuracy, maintainability, and reliability issues during use.
The above problems cause frequent failure, high cost, difficult maintenance and low efficiency of the rail-mounted magnetic induction speed test method in application, and need to be solved urgently.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of testing precision, maintainability, reliability and the like in the prior art, the invention provides a method for testing the speed of a rocket pulley test, which can improve the testing precision of the speed of the rocket pulley test, improve the reliability of products and reduce the cost of human and property.
Technical scheme of the invention
The test device comprises a vehicle-mounted signal acquisition memory, a magnetoelectric sensor and a permanent magnet, wherein the vehicle-mounted signal acquisition memory and the magnetoelectric sensor are arranged on the trolley body; the testing steps are as follows:
1) when the magnetoelectric sensor passes through the permanent magnet along with the movement of the pulley, the magnetoelectric sensor sequentially induces the change of the magnetic field so as to generate electric pulse signals PAn and PBn; wherein A is a first electromagnetic sensor, B is a second electromagnetic sensor, n is the serial number of the permanent magnet, the value is 1,2,3, the.
2) The vehicle-mounted collector records time TAN and TBn corresponding to the magnetic pulse sequences PAn and PBn sensed by the 2 electromagnetic sensors;
3) measuring the distance delta sm between the permanent magnets, wherein m is the serial number of the distance between the two permanent magnets, and the value m is 1,2, 3.
4) The vehicle-mounted collector inputs recorded time Tan and TBn corresponding to magnetic pulse sequences Pan and PBn sensed by the first electromagnetic sensor and the second electromagnetic sensor into a computer, and then inputs measured distance delta sm between the permanent magnets into the computer;
5) and (3) calculating the speed of the first electromagnetic sensor on the pulley in the interval delta sm by using a computer: VAm ═ Δ s/(TAN)+1-TAn), where n is 1,2,3,.. n, and m is 1,2,3,... m, and the speed value corresponds to a time TVAn ═ time (TAn)+1+ TAN)/2, taking time as an abscissa and speed as an ordinate, and drawing a curve of the change of the speed value of the pulley along with time;
6) and calculating the speed of the pulley of the second magnetoelectric sensor in the interval delta sm by a computer: VBm ═ Δ s/(TBn)+1TBn), the time corresponding to the speed value is denoted as TVBn ═ (TBn)+1+ TBn)/2, wherein n is 1,2,3, the.. No. n, m is 1,2,3, the.. No. m, the time is used as an abscissa, the speed is used as an ordinate, and a curve of the change of the speed value of the pulley along with the time is drawn;
7) measuring the distance deltas of two electromagnetic sensors on the pulley along the course;
8) calculating the velocity within a distance Δ s jointly obtained by the magnetoelectric sensors: Δ s/(TBn-TAn), and the time corresponding to this speed value is recorded as TVn ═ TBn + TAn)/2, where n denotes a serial number and takes a value of 1,2, 3.... n; and drawing a curve of the change of the speed value of the pulley along with time by taking the time as an abscissa and the speed as an ordinate.
The invention has the advantages and beneficial effects that: according to the invention, 2 or more magnetoelectric sensors are arranged on the pulley along the course to form multi-point detection, and the measurement points respectively obtain the running speed data of the pulley, so that mutual backup can be realized, and the reliability of speed measurement work is improved; further forming new distance difference and time difference along the course between the measuring points, thereby obtaining a higher-precision speed value in a shorter interval through difference calculation, for example, the speed measuring interval can be accurately 1m from the original 10 m; the magnetoelectric sensor is arranged above the pulley, so that the inspection and the maintenance are convenient, the adverse effect of field uncontrollable environmental factors on circuits and equipment is avoided, and the equipment maintenance efficiency is improved; the permanent magnet is firm and durable, can basically avoid maintenance, has lower requirement on installation accuracy and is convenient for engineering realization and maintenance; the consumption of the magnetoelectric sensor and a cable circuit is greatly reduced on the whole, and the cost is obviously reduced; the vehicle-mounted differential speed measurement mode only needs to measure interval intervals once, and the original rail-mounted magnetoelectric speed measurement method needs to test 599 interval intervals along a 6km track, so that the working efficiency is obviously improved. The invention can be widely applied to the rail car tests which need high-precision speed parameter testing and control, such as aviation, aerospace, weaponry and the like.
Drawings
FIG. 1 is a schematic diagram of a prior art configuration of the present invention;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a diagram illustrating the operation effect of the present invention.
Wherein, 1, a pulley body; 2. a track; 3. a permanent magnet; 4. a magnetoelectric sensor; 5. a magnetoelectric sensor; 6. signal acquisition memory
Detailed Description
The method comprises the steps of installing 2 or more than 2 magnetoelectric sensors on a pulley along the course and measuring the installation distance of the magnetoelectric sensors, arranging a signal acquisition and storage device on the pulley to record the pulse generation time of the magnetoelectric sensors, and installing permanent magnets near a track and measuring the distance between the permanent magnets. Calculating to obtain multiple pieces of speed measurement data which are mutually backup according to the installation among the permanent magnets and the pulse time difference of a single magnetoelectric sensor; and calculating to obtain higher-precision speed data according to the course distance of the 2 magnetoelectric sensors and the pulse time difference of the 2 magnetoelectric sensors.
The test device for the test speed of the rocket tackle comprises a vehicle-mounted signal acquisition memory (6) and magnetoelectric sensors (4) and (5) which are arranged on a tackle body (1), and a permanent magnet (3) arranged beside a track (2). The magnetoelectric sensors (4) and (5) are used for sequentially inducing the magnetic field change of the permanent magnet (3) when passing through the permanent magnet (3) along with the movement of the pulley so as to generate electric pulse signals, and the vehicle-mounted signal acquisition memory (6) acquires and records the time when the electric pulse signals of the magnetoelectric sensors (4) and (5) are generated. The following figures.
The working steps or principle are as follows:
1) the magnetoelectric sensors (4) and (5) sequentially sense the change of the magnetic field when passing through the permanent magnet (3) along with the movement of the pulley so as to generate electric pulse signals PAn and PBn; wherein n is the serial number of the permanent magnet, and the value is 1,2, 3. PA1 is the pulse produced by the magneto-electric sensor (4) through the 1 st magnet, PA2 is the pulse produced by the magneto-electric sensor (4) through the 2 nd magnet; PB1 is the pulse generated by the magnetoelectric sensor (5) through the 1 st magnet, PB2 is the pulse generated by the magnetoelectric sensor (4) through the 2 nd magnet.
2) The vehicle-mounted collector (6) records the time TAN and TBn corresponding to the magnetic pulse sequences PAn and PBn sensed by the 2 sensors; for example: TA1 is the time of occurrence of PA1, TA2 is the time of occurrence of PA2, ·.., TAn is the time of occurrence of PAn, TB1 is the time of occurrence of PB1, TB2 is the time of occurrence of PB2,... and TBn is the time of occurrence of PBn;
3) measuring the distance Δ sn between the permanent magnets (3), wherein n is the serial number of the magnet spacing and takes the values 1,2, 3. Δ s1 is the distance from the 2 nd magnet to the 1 st magnet, Δ s2 is the distance from the 3 rd magnet to the 2 nd magnet,. -;
4) calculating the speed of the pulley in the interval delta sn obtained by the magnetoelectric sensor (4): VAn ═ Δ sn/(TAN)+1TAN), this speed valueRepresents the speed of the tackle in the interval Δ sn, and the time corresponding to this speed value can be denoted as TVAn ═ TAn+1+ TAn)/2, wherein n represents a serial number and takes a value of 1,2, 3.; for example: the speed VA1 ═ Δ s1/(TA2-TA1) of the tackle between the 2 nd magnet and the 1 st magnet, and this speed value corresponds to the time TVA1 ═ (TA2+ TA 1)/2; the speed VA2 ═ Δ s2/(TA3-TA2) of the trolley between the 3 rd and 2 nd magnets, this speed value corresponding to the instant TVA2 ═ (TA3+ TA 2)/2. Drawing and connecting points (TVan, VAn) by taking time as an abscissa and speed as an ordinate to obtain a curve of the change of the speed value of the pulley along with time;
5) calculating the speed of the pulley in the interval delta sn obtained by the magnetoelectric sensor (5): VBn ═ Δ sn/(TBn)+1TBn), which represents the speed of the carriage in the interval Δ sn, and which corresponds to a time denoted TVBn ═ (TBn)+1+ TBn)/2, wherein n represents a sequence number, and takes a value of 1,2, 3.; for example: the speed VB1 of the pulley between the 2 nd magnet and the 1 st magnet is delta s1/(TB2-TB1), and the corresponding time of the speed value is TVB1 which is (TB2+ TB 1)/2; the speed VB2 of the trolley between the 3 rd magnet and the 2 nd magnet is Δ s2/(TB3-TB2), and this speed value corresponds to the time TVB2 (TB3+ TB 2)/2. Drawing and connecting points (TVBn, VBn) by taking time as an abscissa and speed as an ordinate to obtain a curve of the change of the speed value of the pulley along with time;
6) measuring the distance deltas of the magnetoelectric sensors (4) and (5) on the pulley along the course;
7) calculating the velocity within the distance Δ s jointly obtained by the magnetoelectric sensors (4), (5): the speed value represents the movement speed of the tackle in the interval Δ s, and the corresponding time of the speed value can be recorded as TVn ═ TBn + TAn)/2, wherein n represents a serial number and is 1,2, 3. For example, TA1 is the time when the sensor (4) passes through the 1 st magnet, TB1 is the time when the sensor (5) passes through the 1 st magnet, V1 ═ Δ s/(TB1-TA1) represents the speed of the carriage in the Δ s interval after passing through the 1 st magnet, and this speed value corresponds to the time TV1 ═ (TB1+ TA 1)/2; TA2 is the time when the sensor (4) passes the 2 nd magnet, TB2 is the time when the sensor (5) passes the 2 nd magnet, V2 ═ Δ s/(TB2-TA2) represents the speed of the carriage in the Δ s interval after passing the 2 nd magnet, and this speed value corresponds to the time TV2 ═ TB2+ TA 2)/2. By taking time as an abscissa and speed as an ordinate, drawing and connecting points (TVn, Vn) to obtain a curve of the change of the speed value of the pulley along with time;
examples
In a certain rocket pulley test, 2 magnetoelectric sensors A and B are installed on the pulley along the heading direction, wherein A is 1.2589m in front of B. A signal acquisition memory is arranged on the trolley to record the time of the output pulse of the magnetoelectric sensor, and 599 permanent magnets are arranged on the track at a distance of about 10m along the axial direction. 2 pieces of speed measurement data which are mutually backup are obtained by calculation according to the installation distance between the permanent magnets and the pulse time difference of the single magnetoelectric sensor; and calculating to obtain 1 part of higher-precision speed measurement data according to the course distance of the 2 magnetoelectric sensors and the time difference of the pulses of the 2 magnetoelectric sensors, wherein the 3 parts of speed measurement data are compared with the speed measurement data obtained by the original rail-mounted magnetoelectric induction speed measurement system, such as the speed measurement data pair shown in figure 3. Wherein the maximum speed value occurs in the vicinity of the 127# and 128# permanent magnets.
1) The velocity values are obtained from the induction pulse time and the permanent magnet spacing of sensor a:
time TA for sensor A to pulse at 128# permanent magnet128＝6.83850s
Time TA for sensor A to pulse at 127# permanent magnet127＝6.81103s,
Velocity VA12710m/(6.83850s-6.81103s) ═ 364.033m/s, which indicates the speed of the tackle between the 127# and 128# magnets
Its corresponding time TVA127＝(6.83850s+6.81103s)/2＝6.797255s；
2) The velocity values are obtained from the induction pulse time and the permanent magnet spacing of sensor B:
time TB of sensor B generating a pulse at 128# permanent magnet128＝6.84195s
Time TB of sensor B generating a pulse at 127# permanent magnet127＝6.81450s,
Velocity VB127＝10m/(6.84195-6.81450s) 364.299m/s, which indicates the speed of the tackle between 127# and 128# magnets
Corresponding time TVB127＝(6.84195s+6.81450s)/2＝6.828225s；
3) Velocity values were obtained from the sensing pulse time and A, B spacing of sensor A, B:
time TA for sensor A to pulse at 127# permanent magnet128＝6.81103s
Time TB of sensor B generating a pulse at 127# permanent magnet128＝6.81450s
Time TA for sensor A to pulse at 128# permanent magnet128＝6.83850s
Time TB of sensor B generating a pulse at 128# permanent magnet128＝6.84195s
The mounting distance s of the sensor A, B is 1.2589m
Velocity V1271.2589m/(6.81450s-6.81103s) ═ 362.795m/s, which indicates the speed of the sled within 1.2589m behind 127# magnet, which corresponds to time TV127＝(6.81450s+6.81103s)/2＝6.812765s；
Velocity V1281.2589m/(6.84195s-6.83850s) ═ 364.899m/s, which indicates the speed of the sled within 1.2589m behind magnet # 128, which corresponds to time TV128＝(6.84195s+6.83850s)/2＝6.840225s；
4) The induction pulse time and the magnet spacing in the whole course are calculated one by one, and the obtained speed value and the corresponding time value are plotted to obtain a graph 3.
Claims (1)
1. A test method of rocket pulley test speed, the testing device includes the vehicle carried signal acquisition memory (6), magnetoelectric sensor (4, 5), permanent magnet (3), characterized by, the vehicle carried signal acquisition memory (6) and magnetoelectric sensor (4, 5) are installed on the pulley car body (1), the permanent magnet (3) is installed on the side of the orbit (2), magnetoelectric sensor (4, 5) is connected with the vehicle carried signal acquisition memory (6) separately, the vehicle carried signal acquisition memory (6) is connected with computer; the testing steps are as follows:
1) the magnetoelectric sensors (4, 5) successively induce when moving along with the pulley and passing through the permanent magnet (3)To the magnetic field change to generate an electric pulse signal PAn、PBn(ii) a Wherein A is a first magnetoelectric sensor (4), B is a second magnetoelectric sensor (5), N is the serial number of the permanent magnet, the value is 1,2,3, the.
2) The vehicle-mounted signal acquisition memory (6) records an electric pulse signal PA sensed by the 2 magnetoelectric sensorsn、PBnCorresponding time TAn、TBn；
3) Measuring the distance deltas between the permanent magnets (3)nWherein Δ snThe distance between the n +1 th permanent magnet and the nth permanent magnet;
4) an electric pulse signal PA sensed by the first magnetoelectric sensor (4) and the second magnetoelectric sensor (5) and recorded by the vehicle-mounted signal acquisition memory (6)nAnd PBnCorresponding time TAnAnd TBnInputting the distance delta s between the permanent magnets (3) into a computer and measuring the distance delta s between the permanent magnetsnInputting the data into a computer;
5) the interval delta s of the first magnetoelectric sensor (4) on the pulley is obtained by the computer calculationnInner speed:
VAn＝△sn/(TAn+1-TAn) The time corresponding to the speed value is TVAn＝(TAn+1+TAn) The speed is used as a longitudinal coordinate, and a curve of the speed value of the pulley along with the change of the time is drawn;
6) the pulley interval Delta s of the second magnetoelectric sensor (5) is obtained by the computernInner speed:
VBn＝△sn/(TBn+1-TBn) The time corresponding to the speed value is denoted as TVBn＝(TBn+1+TBn) The speed is used as a longitudinal coordinate, and a curve of the speed value of the pulley along with the change of the time is drawn;
7) measuring the distance delta s of two magnetoelectric sensors (4, 5) on the pulley along the course;
8) calculating the velocity within a distance Δ s jointly obtained by the magnetoelectric sensors (4, 5): vn＝△s/(TBn-TAn) The time corresponding to this speed value is denoted as TVn＝(TBn+TAn) And/2, drawing a curve of the speed value of the pulley along with time by taking time as an abscissa and speed as an ordinate.
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| US7746064B2 (en) * | 2004-09-27 | 2010-06-29 | Siemens Aktiengesellschaft | Speed measurement for an electrical permanent-magnet synchronous machine |
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