CN102156015A - Aerial drop or parachuting overload testing device - Google Patents
Aerial drop or parachuting overload testing device Download PDFInfo
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- CN102156015A CN102156015A CN 201110053099 CN201110053099A CN102156015A CN 102156015 A CN102156015 A CN 102156015A CN 201110053099 CN201110053099 CN 201110053099 CN 201110053099 A CN201110053099 A CN 201110053099A CN 102156015 A CN102156015 A CN 102156015A
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Abstract
The invention relates to an aerial drop or parachuting overload testing device. The testing device is provided with a functional circuit which includes a single chip main control circuit, a three-dimensional acceleration measuring circuit and a Flash storage circuit; the testing device is bound on an aerial drop article or a parachutist body; within a section of time before landing, three-dimensional data measured by the three-dimensional acceleration measuring circuit is transmitted to the single chip main control circuit to be processed and then stored in the Flash storage circuit; after landing, the three-dimensional data in the storage circuit is analyzed by a computer; and a stressing situation in the aerial drop or parachuting process can be obtained through an acceleration variation curve. The aerial drop or parachuting overload testing device provided by the invention has the advantages of small structure, good resistance to shock, pressure and severe environments and accurate and reliable data, can provide reliable experiment data to scientific aerial drop or parachuting trainings, provides an important reference basis to performance evaluation of the parachute and has a certain instructive effect on material selection and a manufacturing process of the parachute.
Description
Technical field
The present invention relates to proving installation, particularly a kind of device that is used for measuring and writing down the suffered impulsive force size of air-drop or parachute jumping process weight or human body.
Background technology
Air-drop or parachute jumping are a kind of high risk activities, and the overload impact when parachute-opening is with landing in whole process can be damaged goods and materials or harmful to human.Impulsive force when parachute-opening and landing is a kind of instantaneous impact, so the damage that will prevent impact acceleration to cause, and just must know the size of overload values.
Some external researchists have adopted the measuring method of a large amount of simulation tests in order to obtain the related data in parachute parachute-opening and the landing mission.Domestic now being used for mainly contains two classes to the system of parachute parachute-opening and landing overload measurement: a class is a mechanical measurement, the direct record of its working pressure sensor; Another kind of is electrical measurement, and it utilizes acceleration transducer to carry out data acquisition, shows the overload parameter.The overload measurement instrument that adopts the mechanical measurement principle substantially all is not more than 30HZ because the frequency of operation of mechanical measurement is low, can occur the phenomenon of loss of data when the fast-changing accekeration of record, is just progressively replaced by electric measuring system.Present widely used electric measuring system has the DC-1 electric measuring system, but generally is used for the test of lower recorery parachute of parachute-opening frequency ratio and drag parachute; Also has data acquisition unit based on 8051 single-chip microcomputers, can gather multiple sensor, sample frequency is higher, signal is stored in the Flash storer after treatment, though cost is low, volume is little, easy to carry, because the single-chip data memory span is limited, total sampling time is too short, the data in whole air-drop or the parachute jumping process can not be gathered, the phenomenon of loss of data can be caused equally.
Therefore a kind of with low cost, volume is small and exquisite, can accurately simulate movement locus in whole air-drop or the parachute jumping process and the air-drop or the parachute jumping overload measurement device of dynamic behaviour is a problem demanding prompt solution.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of air-drop or parachute jumping overload measurement device, to solve the problem of existing parachute parachute-opening and landing overload measurement system data out of true even loss of data.
The present invention solves its technical matters and adopts following technical scheme:
Air-drop provided by the invention or parachute jumping overload measurement device are provided with functional circuit, this functional circuit comprises the single-chip microcomputer main control circuit, three-dimensional acceleration metering circuit and Flash memory circuit, this proving installation is tied up on one's body air-drop thing or parachutist, before land during this period of time in, by the three-dimensional acceleration metering circuit three-dimensional data that records being passed to the single-chip microcomputer governor circuit handles, store into then in the Flash memory circuit, the back of landing is carried out analyzing and processing by computing machine to the three-dimensional data in the memory circuit, can draw stressing conditions in air-drop or the parachute jumping process by the acceleration change curve.
Described single-chip microcomputer main control circuit passes through the collection and the access of AVR Single-chip Controlling data, and controls the exchanges data and the processing of this device and computing machine.
Described three-dimensional acceleration metering circuit comprises three dimension acceleration sensor and peripheral circuit thereof, wherein: three dimension acceleration sensor links to each other with three A/D input ports of single-chip microcomputer respectively to transmit by X, Y, Z three axis and detects data, is gathered the acceleration of X-axis, Y-axis and Z axle in air-drop or the parachute jumping process by the control of single-chip microcomputer governor circuit; Three axis should connect filter capacitor, disturb to eliminate.
Described three dimension acceleration sensor can adopt three dimension acceleration sensor ADXL326.
This proving installation is provided with the clock circuit of damping design, described damping is designed to: clock circuit independently is contained on the platelet, adopting the good frequency of shock resistance is that 7.3728MHz quartz crystal and phase inverter constitute crystal oscillating circuit, and be connected with the functional circuit damping of described device, weaken and impact the vibrations that bring.
This proving installation is provided with a power circuit that has power switch, becomes 5V or the 3.3V power supply that each functional circuit needs through voltage transitions again by the power supply of 9V chargeable lithium battery; When power switch was closed, single-chip microcomputer governor circuit no power powered on by an external stay cord trigger switch described device of manual triggers when dropping or parachute; After data acquisition finished, main control singlechip made the automatic powered-down of described device, and the time is adjustable.
Described Flash memory circuit is independent of single-chip microcomputer, selects the Flash chip of 4M Bytes for use, is used to store the data that whole dropping process is gathered.
Described single-chip microcomputer is drawn the acceleration change curve of whole air-drop or parachute jumping process according to the three-dimensional data analyzing and processing in the Flash memory circuit, and draws weight or human body stress's change procedure according to newton's second law of motion.
The present invention compared with prior art has following main advantage:
1. main control circuit is selected the AVR single-chip microcomputer for use, compares with 51 single-chip microcomputers, and processing speed is faster in the sheet, and antijamming capability is stronger, and power consumption is lower, and survey the complete machine electric current less than 80mA, and analog comparator and A/D converter are arranged in the sheet, but the simplification device circuit.
2. the three-dimensional acceleration metering circuit is selected special-purpose three dimension acceleration sensor for use, volume is little, low in energy consumption, shock resistance is good, the acceleration voltage signal of three direction of principal axis through signal condition can be provided, can draw the three-dimensional acceleration change curve in the whole decline process in view of the above.
3. the Flash memory circuit is selected the Flash chip of 4M Bytes for use, enough stores the data of gathering in the whole decline process, data acquisition can be set be not less than 20 minutes storage time, guarantees not have loss of data.
4. clock circuit is selected the good special-purpose crystal of anti-seismic performance for use, and is connected with the device circuit damping, in the acceleration of gravity scope of test, and crystal energy operate as normal, the output clock is not received interference, has improved the anti-damage performance of device greatly.
5. by USB interface this device directly is connected with computing machine, reading of data is also analyzed, and need not special-purpose fetch equipment.
6. Computer Processing is partly made corresponding host computer assay surface, can directly draw three-dimensional acceleration change curve and three-dimensional force analysis curve according to storage data in the Flash chip, and is convenient directly perceived.
In a word, structure of the present invention is small and exquisite, antidetonation resistance to compression and the anti-adverse environment performance is good, data are accurately reliable, can provide reliable experimental for air-drop, the parachuting training of science, provide important reference frame to estimating the parachute performance, and the material selection and the manufacturing process of parachute had certain directive function.
Description of drawings
Fig. 1 is a motion model analysis chart of the present invention.
Fig. 2 is a vertical direction analysis chart of the present invention.
Fig. 3 is a horizontal direction analysis chart of the present invention.
Fig. 4 is a system architecture diagram of the present invention.
Fig. 5 is the process flow diagram of collection of the present invention and storage data.
Fig. 6 is the process flow diagram of reading and sending data of the present invention.
Fig. 7 is the process flow diagram of computer end data analysis of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Air-drop provided by the invention or parachute jumping overload measurement device, it is a kind of device that is used for measuring and writing down air-drop or parachute jumping process object or person stressing conditions, the structure of this device comprises single-chip microcomputer main control circuit, three-dimensional acceleration metering circuit, power circuit, clock circuit and Flash memory circuit as shown in Figure 4.This proving installation is tied up on one's body air-drop thing or parachutist, before land during this period of time in, by the three-dimensional acceleration metering circuit three-dimensional data that records being passed to the single-chip microcomputer governor circuit handles, store into then in the Flash memory circuit, the back of landing is carried out analyzing and processing by computing machine to the three-dimensional data in the memory circuit, can draw stressing conditions in air-drop or the parachute jumping process by the acceleration change curve.
The core control section that described single-chip microcomputer main control circuit is a total system is used for the collection of control data and the exchanges data of access and this device and computing machine, comprises single-chip microcomputer and ISP download circuit thereof, can online download control program.Wherein: single-chip microcomputer is selected the ATMEGA128 of AVR series for use, is linked to each other with computer by winding displacement by the ten core sockets of the ISP on the circuit board, realizes online downloading control.
The important process part that described three-dimensional acceleration metering circuit is a device comprises three dimension acceleration sensor and peripheral circuit thereof, is used for gathering the acceleration of air-drop or parachute jumping process X-axis, Y-axis and Z axle.Wherein: three dimension acceleration sensor adopts three dimension acceleration sensor ADXL326, and this sensor links to each other with single-chip microcomputer by X, Y, Z three axis and transmits data, and peripheral circuit only need add filter capacitor, and structure is very simple.
Described power circuit comprises power supply trigger control circuit and voltage conversion circuit.Power circuit is provided with a power switch, becomes 5V or the 3.3V power supply that each functional circuit needs through voltage transitions again by the power supply of 9V chargeable lithium battery.Wherein: the power supply trigger control circuit is that a stay cord gauge tap is connected this device of triggering with USB, when parachute jumping, manually boots this device power supply by stay cord; By single-chip microcomputer data acquisition time being set is five minutes (also can change), and after data acquisition finished, this installed automatic powered-down; When this device is connected to computing machine with the USB line, this device can start automatically.Voltage conversion circuit becomes the 5V power supply to the 9V power source conversion by three terminal regulator 7805, offer acceleration analysis circuit and single-chip microcomputer governor circuit, by three terminal regulator AS1117-3.3 the 5V power source conversion is become the 3.3V power supply again, give the power supply of Flash memory circuit and usb circuit.Simultaneously at each power input to low-frequency noise and high frequency noise filtering.
Described clock circuit adopts damping designed system clock circuit.Because overload measurement device of the present invention can be subjected to big impact in test process, and quartz crystal is the device of comparison fragility, may damage,, adopt Vibration Absorption Designing in order to reduce the failure rate of device when being subjected to large impact power.Clock circuit independently is contained on the platelet, and selecting the good frequency of shock resistance for use is that 7.3728MHz quartz crystal and phase inverter constitute crystal oscillating circuit, and is connected with the device circuit damping, weakens and impacts the vibrations that bring.
Described Flash memory circuit is independent of single-chip microcomputer, adopts the Nor Flash of 4M Bytes capacity, is used to store the three-dimensional data that whole dropping process is gathered.
The I/O mouth of single-chip microcomputer is by multiplexing its address wire of latch and data line.Single-chip microcomputer is drawn the acceleration change curve of whole air-drop (parachute jumping) process according to the three-dimensional data analyzing and processing in the Flash memory circuit, and draws weight or human body stress's change procedure.
Overload measurement device of the present invention links to each other with the serial port of computer through USB commentaries on classics serial port circuit by the usb data line and carries out data transmission, and circuit changes the RS-232 bridging chip by USB and peripheral cell constitutes.
The course of work of overload measurement device of the present invention (abbreviation device) is: when power switch is closed, device main circuit no power, device is when parachute jumping, by stay cord manual start device power supply, this moment, the three-dimensional acceleration metering circuit began image data, and real-time storage is in the Flash memory circuit.The default setting acquisition time is five minutes (this is the time span of the process of parachuting usually, but also can change be set by single-chip microcomputer), after data acquisition finishes, installs automatic powered-down.Be connected to computing machine when installing with the USB line, device can start automatically, and data are sent to computing machine, by the computer for analysis process software data is carried out analyzing and processing again.
The present invention adopts following method to realize measuring and writing down the stressed operating mode of object or person in air-drop or the parachute jumping process:
At first set up the three-dimensional motion model of air-drop or parachute jumping process:
As shown in Figure 1 to Figure 3, parachute system aggregate velocity over the ground is
, can resolve into the speed of three directions.
Consider the situation of vertical direction earlier, only be subjected to the influence of gravity and air resistance, the vertical stressed kinetics equation of parachute system:
In the formula:
Be air resistance,
Be the parachute system gross mass,
Be the parachute system normal acceleration.
In the formula:
For parachute system exists
The speed of axle, V
ZiFor
Time point
Speed on the axle.
Have on the horizontal direction
The axle and
Axial acceleration has the kinematics formula equally:
In the formula:
For parachute system exists
The acceleration of axle,
For parachute system exists
The acceleration of axle,
Be parachute system aggregate velocity in the horizontal direction, V
FiFor
The aggregate velocity of the horizontal direction of time point.
Therefore known parachute system three-dimensional acceleration can calculate the absolute velocity of parachute system.
The ultimate principle of acceleration transducer is to be based upon on newton's second law of motion basis, and promptly the rate of change of particle momentum is directly proportional with suffered external force.When the quality of particle was constant, the acceleration of particle was directly proportional with the acting force that is subjected to.
In the formula:
Be the quality of particle,
Be the speed of particle,
Momentum for particle.
By above motion model as can be known: suffered impact acceleration in the time of just can calculating the stressing conditions measured in air-drop or the parachute jumping process and landing by measuring acceleration.
Secondly, adopt following steps to measure and write down the acceleration of air-drop or parachute jumping overall process.
1. the collection of data and storage:
As shown in Figure 5, after power switch was opened, single-chip microcomputer carried out initialization to each module earlier.5 minutes data acquisition time of timing (time of landing from disembarking to is 5 minutes usually, and this time also can be changed) is fixed owing to gather and store the cycle of data then, and timing can be realized by the regulation times of collection.Gathering each time all is earlier the output voltage of sensor to be done the A/D conversion, then conversion value is done coding, stores among the Nor Flash again.After arriving predetermined conversion times, EOP (end of program) is cut off the electricity supply.
2. data read and send to computing machine:
As shown in Figure 6, after this device was connected to computing machine by the usb data line, single-chip microcomputer is initialization at first, waited for then receiving the order that computer sends reading of data.After serial port received the read data order, single-chip microcomputer read the data of gatherer process storage from Nor Flash, be that unit sends to computer with the byte by serial port then, sent until all data to finish.
3. the data analysis of computer end:
As shown in Figure 7, at first receive the data that harvester sends by serial port, deposit data in default buffer memory earlier, to intuitively depicting the air-drop of being write down or the acceleration of parachute jumping process with the form of figure or curve after the data decoding.
The above, it only is preferred embodiment of the present invention, be not that structure of the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations that above embodiment did.
Claims (8)
1. one kind is dropped or parachute jumping overload measurement device, it is characterized in that: this proving installation is provided with functional circuit, it comprises the single-chip microcomputer main control circuit, three-dimensional acceleration metering circuit and Flash memory circuit, this proving installation is tied up on one's body air-drop thing or parachutist, before land during this period of time in, by the three-dimensional acceleration metering circuit three-dimensional data that records being passed to the single-chip microcomputer governor circuit handles, store into then in the Flash memory circuit, the back of landing is carried out analyzing and processing by computing machine to the three-dimensional data in the memory circuit, can draw stressing conditions in air-drop or the parachute jumping process by the acceleration change curve.
2. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: described single-chip microcomputer main control circuit passes through the collection and the access of AVR Single-chip Controlling data, and controls the exchanges data and the processing of this device and computing machine.
3. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: described three-dimensional acceleration metering circuit comprises three dimension acceleration sensor and peripheral circuit thereof, wherein: three dimension acceleration sensor links to each other with three A/D input ports of single-chip microcomputer respectively to transmit by X, Y, Z three axis and detects data, is gathered the acceleration of X-axis, Y-axis and Z axle in air-drop or the parachute jumping process by the control of single-chip microcomputer governor circuit; Three axis should connect filter capacitor, disturb to eliminate.
4. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: described three dimension acceleration sensor adopts three dimension acceleration sensor ADXL326.
5. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: this proving installation is provided with the clock circuit of damping design, described damping is designed to: clock circuit independently is contained on the platelet, adopting the good frequency of shock resistance is that 7.3728MHz quartz crystal and phase inverter constitute crystal oscillating circuit, and be connected with the functional circuit damping of described device, weaken and impact the vibrations that bring.
6. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: this proving installation is provided with a power circuit that has power switch, becomes 5V or the 3.3V power supply that each functional circuit needs through voltage transitions again by the power supply of 9V chargeable lithium battery; When power switch was closed, single-chip microcomputer governor circuit no power powered on by an external stay cord trigger switch described device of manual triggers when dropping or parachute; After data acquisition finished, main control singlechip made the automatic powered-down of described device, and the time is adjustable.
7. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: described Flash memory circuit is independent of single-chip microcomputer, selects the Flash chip of 4M Bytes for use, is used to store the data that whole dropping process is gathered.
8. air-drop according to claim 1 or parachute jumping overload measurement device, it is characterized in that: single-chip microcomputer is according to the three-dimensional data analyzing and processing in the Flash memory circuit, draw the acceleration change curve of whole air-drop or parachute jumping process, and draw weight or human body stress's change procedure according to newton's second law of motion.
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| CN 201110053099 CN102156015A (en) | 2011-03-07 | 2011-03-07 | Aerial drop or parachuting overload testing device |
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| CN 201110053099 CN102156015A (en) | 2011-03-07 | 2011-03-07 | Aerial drop or parachuting overload testing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631767A (en) * | 2012-03-21 | 2012-08-15 | 浙江理工大学 | Upper arm extension exercise correcting device and method |
| CN109406159A (en) * | 2018-05-23 | 2019-03-01 | 苏州博之盾防护技术有限公司 | A kind of airborne vehicle air-drop simulator of load person |
| CN110659241A (en) * | 2019-09-17 | 2020-01-07 | 中国兵器工业集团第二一四研究所苏州研发中心 | Data acquisition system based on ATmega48 |
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| US4420755A (en) * | 1981-08-21 | 1983-12-13 | The United States Of America As Represented By The Secretary Of The Air Force | Telemetry load link assembly |
| US6299104B1 (en) * | 2000-08-03 | 2001-10-09 | Photonics Laboratories, Inc. | Method and apparatus for evaluating parachutes under load |
| CN101309612A (en) * | 2005-09-15 | 2008-11-19 | 什洛莫·拉尼亚多 | Weight-measuring device |
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2011
- 2011-03-07 CN CN 201110053099 patent/CN102156015A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4420755A (en) * | 1981-08-21 | 1983-12-13 | The United States Of America As Represented By The Secretary Of The Air Force | Telemetry load link assembly |
| US6299104B1 (en) * | 2000-08-03 | 2001-10-09 | Photonics Laboratories, Inc. | Method and apparatus for evaluating parachutes under load |
| CN101309612A (en) * | 2005-09-15 | 2008-11-19 | 什洛莫·拉尼亚多 | Weight-measuring device |
Non-Patent Citations (2)
| Title |
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| 《中国优秀硕士学位论文全文数据库 工程科技II辑》 20060815 周令 伞兵伞开伞、着陆过载测试系统及过程仿真 , 第8期 2 * |
| 《中国优秀硕士学位论文全文数据库 工程科技II辑》 20101215 刘钊 空投重物、伞兵跳伞过载测试装置的设计与实现 , 第12期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631767A (en) * | 2012-03-21 | 2012-08-15 | 浙江理工大学 | Upper arm extension exercise correcting device and method |
| CN109406159A (en) * | 2018-05-23 | 2019-03-01 | 苏州博之盾防护技术有限公司 | A kind of airborne vehicle air-drop simulator of load person |
| CN110659241A (en) * | 2019-09-17 | 2020-01-07 | 中国兵器工业集团第二一四研究所苏州研发中心 | Data acquisition system based on ATmega48 |
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Application publication date: 20110817 |