CN101710030A - System and method for testing performance of cross flow fan - Google Patents
System and method for testing performance of cross flow fan Download PDFInfo
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- CN101710030A CN101710030A CN 200910043252 CN200910043252A CN101710030A CN 101710030 A CN101710030 A CN 101710030A CN 200910043252 CN200910043252 CN 200910043252 CN 200910043252 A CN200910043252 A CN 200910043252A CN 101710030 A CN101710030 A CN 101710030A
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Abstract
The invention discloses a system and a method for testing the performance of a cross flow fan. The system comprises a sensor system, a single chip testing and control system and a computer, wherein the sensor system comprises a fan rotating speed sensor, a fan air speed sensor, an air temperature sensor, an atmospheric pressure sensor, a fan dynamic pressure sensor, a fan static pressure sensor, a fan torque sensor and a noise measurer; the sensors and the measurer of the sensor system are used for outputting electric signals connected with the single chip testing and control system; the single chip testing and control system uses a single chip as a core for converting and processing data; and finally the data are transmitted into a host computer for processing and displaying by a serial port. The invention has the advantages of various automatic testing functions, strong adaptability, simple operation, convenient maintenance, higher reliability and higher accuracy.
Description
Technical field
The present invention relates to a kind of measuring method and device, be specifically related to a kind of testing performance of cross flow fan system and method.
Background technology
The experimental study of cross flow fan starts from France, the More spy by France (Mortier) in 1892 invention.Beginning only is used for mine ventilation, and the 1950's, cross flow fan caused people's attention, and its research and application entered the new stage.China starts from the seventies in 20th century to test, the research of cross flow fan, and to the eighties, the scholar of units such as Luoyang Polytechnical College, Dongbei Agricultural College has done monographic study to cross flow fan, and the good effect of playing is used in the design of China's cross flow fan.
Compare with centrifugal fan, axial fan, characteristics that the air-flow that cross flow fan has is simple in structure, volume is little, produce steadily, the dynamic pressure coefficient is higher and operating distance is long and noise is low etc. are widely used in the occasion of low pressure ventilations ventilations such as household electrical appliance and air-conditioning equipment in recent years.
Design high performance cross flow fan, must inquire into its structural parameters and kinematic parameter, set up the model blower fan and test, the model blower fan is carried out performance test and analysis.
The performance of cross flow fan embodies with feed flow, generation total head, power demand and efficient, exists corresponding relation between these running parameters, when flow and rotation speed change, can cause that other parameters change accordingly.For correct selection, use cross flow fan, must understand the mutual relationship between the cross flow fan performance parameter.Because the special construction of cross flow fan, add asymmetry and complicacy that it flows, make fuzzy to its Effect on Performance factor, it is perfect that the cross flow fan theory is still owed so far, so the performance test that mainly depends on performance test cross flow fan product of obtaining of cross flow fan performance parameter is the important means that blower fan manufacturing plant is used for the new product development test, examines the quality of the production.
The performance test of China's cross flow fan at present all is in manual stage or semi-hand stage, and not only precision is low, speed slow, poor reliability, and wastes time and energy, and efficient is lower.
Summary of the invention
Technical matters to be solved by this invention is: solve the above-mentioned technical matters that existing testing performance of cross flow fan exists, and provide a kind of and have multinomial autorun, adaptability is strong, and is simple to operate, easy to maintenance and the testing performance of cross flow fan system and method for higher reliability and accuracy arranged.
The technical solution used in the present invention is: this testing performance of cross flow fan system comprises sensing system, singlechip computer system, computing machine, sensing system comprises the rotation speed of fan sensor, the blower fan air velocity transducer, the wind-warm syndrome temperature sensor, barometric pressure sensor, blower fan dynamic pressure pressure transducer, the fan static pressure pressure transducer, the blower fan torque sensor, noise measuring set, the sensor of sensing system and measuring instrument output electric signal are connected to singlechip computer system, singlechip computer system is core with the single-chip microcomputer, finish the conversion and the processing of data, by serial port data are sent into host computer processing and demonstration at last.
In the technique scheme, singlechip computer system is a core with the AT89S52 single-chip microcomputer, mainly comprise mould/number conversion circuit, serial communication circuit, watchdog circuit and power circuit,
In the technique scheme, the air velocity transducer structure is: the tubular stainless steel ventilating duct that a smooth air is installed at fan outlet, pitot tube one end stretches in the ventilating duct, the static pressure end of pitot tube other end output is connected the micro differential pressure transmitter with the total head end, the micro differential pressure transmitter is converted into electric signal with pressure reduction, sends into singlechip computer system, and ventilating duct and pitot tube all are fixed on the transfer table, the driven by motor transfer table moves, to the multimetering of fan outlet optional position.
In the technique scheme, torque sensor is a magneto-electric phase differential type torque sensor, structure is: between motor output shaft and blower fan axle elastic shaft is installed, two signal gear are installed at the axle two ends of elastic shaft, one group of signal coil respectively is equipped with in the top of two signal gear, magnet steel is housed in the signal coil, forms the magnetoelectricity signal generator with signal gear.
In the technique scheme, the rotation speed of fan sensor adopts photoelectric sensor, and reflective sheeting superposes on the cross flow fan blade.
Testing performance of cross flow fan method of the present invention is: by rotation speed of fan sensor, blower fan air velocity transducer, torque sensor, barometric pressure sensor, blower fan dynamic pressure pressure transducer, fan static pressure pressure transducer, wind-warm syndrome temperature sensor, the noise measuring set of sensing system; Gather various relevant parameters in real time, sensor and measuring instrument are converted into the breadboardin signal with various physical signallings, and the analog signal transmission of the various representative respective performances parameters that will collect is given singlechip computer system, singlechip computer system is a digital signal with analog signal conversion, the line data of going forward side by side is handled, last singlechip computer system is sent data into host computer by serial port and is handled, computing machine is converted into corresponding performance numerical value with the various signals that received and shows on display, data is stored with performance curve simultaneously and draws.
In the technique scheme, the measurement of cross flow fan efficient is by measuring output power of motor and blower fan output power gained, and asking for of blower fan output power is with pitot tube multimetering blast total head and blast static pressure, calculates gained.
Technique effect of the present invention is: adopt test board, main control computer, singlechip computer system and sensing system that the various performance parameters of cross flow fan are tested, realized the robotization of cross flow fan performance parameter test, effectively raise the efficient of performance test work, the quality of cross flow fan product is effectively ensured, for the new product development of cross flow fan manufacturing plant provides strong technical support.The present invention has multinomial autorun, and adaptability is strong, and is simple to operate, easy to maintenance, good reliability, accuracy height.
The present invention is based on the testing performance of cross flow fan system and the device of computing machine, the measuring accuracy height, reliable measuring data, and can gather the fan performance test data automatically, carry out data processing automatically, and realize the storage of data, draw characteristic curve of fan automatically.The system interface close friend, easy to operate, not only can save manpower greatly, reduce labor intensity, and can reduce cost, improve work situation.
Testing performance of cross flow fan system and device, use is not seen by cross flow fan manufacturer both at home and abroad at present, does not see the pertinent literature report yet.
Description of drawings:
Fig. 1 is a structural principle block diagram of the present invention
Fig. 2～Figure 10 implements circuit diagram for singlechip computer system of the present invention, wherein:
Fig. 2 is a power circuit diagram
Fig. 3 is the single-chip minimum system circuit diagram
Fig. 4 is mould/number conversion circuit diagram
Fig. 5 is serial communication circuit figure
Fig. 6 is noise measuring circuit figure
Fig. 7 is torque measurement signal processing circuit figure
Fig. 8 is temperature measuring circuit figure
Fig. 9 is the atmosphere measuring circuit diagram
Figure 10 is A/D conversion reference power circuit figure
Figure 11 is the measuring wind speed structural representation
Figure 12 is the torque measurement structural representation
Figure 13 is a test flow chart of the present invention
Figure 14 is a host computer data test surface chart
Figure 15 is system's pictorial diagram
Figure 16 is the noise measurement schematic diagram
Embodiment:
The present invention includes host computer, singlechip computer system and sensing system.
Sensing system comprises speed probe, air velocity transducer, temperature sensor, pressure transducer, torque sensor and noise measurement sensor, converts parameters such as the required rotating speed of performance test, wind speed, temperature, pressure, moment of torsion and noise to electric signal.
Singlechip computer system is a core with the AT89S52 single-chip microcomputer, mainly comprises mould/number conversion circuit, signal amplification circuit, current-voltage conversion circuit, serial communication circuit, watchdog circuit and power circuit.Finish the conversion and the processing of data, by serial port data are sent into host computer and handle.
After testing process begins, realize the real-time collection of various relevant parameters such as wind-warm syndrome by sensors such as temperature, wind speed, sensor is converted into the breadboardin signal with various physical signallings, and the analog signal transmission of the various representative respective performances parameters that will collect is given singlechip computer system, singlechip computer system is digital signal with analog signal conversion and is transferred to computing machine, computing machine is converted into corresponding performance numerical value with the various signals that received and shows on display, data is stored with performance curve simultaneously and draws.
A/D converter adopts 12 successive approximation types of high performance-price ratio A/D conversion chip MCP3208 of Microchip company exploitation, it has at a high speed, low in energy consumption, flexible working mode, single-ended input service mode and accurate difference input service mode, can be provided with by order, wherein accurate difference input service mode can effectively suppress the characteristics such as influence of input end common mode interference.This chip internal contains sample/hold circuit, adopts the communication of SPI interface bus, does not almost have a peripheral components with microprocessor, thereby reduced interference and the error of introducing owing to peripheral components, and the while has also been improved reliability.The slewing rate of MCP3208 can reach 100kHz, have eight input end of analog signal of CH0-CH7 (the 0-7 pin of MCP3208 chip), in native system, the simulating signal of the simulating signal of the passage 0 input noise sensor of MCP3208, passage 1 input air velocity transducer.The output simulating signal of the simulating signal of passage 4 input barometric pressure sensor MAX 4100A the 6th pin output, passage 5,6 input static pressure, total head sensor.The CLK of MCP3208, DOUT, DIN, CS pin meet P2.0, P2.1, P2.2, the P2.3 of single-chip microcomputer respectively.Single-chip microcomputer reads translation data by the P2.1 pin.
The output pulsating wave of torque measurement is sent into the Timer T1 (P3.5) of AT89S52.Go out the width of phase differential pulse by single chip computer measurement, be sent to host computer.
The external interrupt INT0 (P3.2) of AT89S52 is sent in the output pulse of tachometric survey, and the negative saltus step that pulse is set triggers to be interrupted, and starts timer conter and calculate pulse width in interrupt service routine, is sent to host computer.
Sensor for measuring temperature DS18B20 adopts the external power supply mode, and DQ end (2 pin) connects the P2.6 and the microprocessor communication of single-chip microcomputer.
The serial port transmitting terminal TXD (P3.1) of single-chip microcomputer and receiving end RXD (P3.0) are connected 11 pin and 12 pin of MAX232 respectively, and 13 pin of MAX232 are connected host computer with 14 pin, receive data that single-chip microcomputer sends, send order to single-chip microcomputer.
Below in conjunction with accompanying drawing embodiments of the present invention are described further:
Referring to Fig. 1, total system is made of managing computer system, singlechip computer system and sensing system.Sensing system comprises rotation speed of fan sensor, air velocity transducer, temperature sensor, pressure transducer, torque sensor and noise measurement sensor.
Referring to Fig. 2～10, the singlechip computer system circuit is a core with the AT89S52 single-chip microcomputer, mainly comprises pressure survey, torque measurement, tachometric survey, temperature survey, measuring wind speed, noise measuring circuit, serial communication circuit, watchdog circuit and power circuit.
1) pressure survey
Atmospheric pressure measurement is selected the MAX 4100A baroceptor of Motorola for use.The temperature compensation range of this sensor is-40～+ 125 ℃; Pressure limit is 20kPa～1050kPa; Output and the corresponding aanalogvoltage of atmospheric pressure, signal (Vs=5.0V) scope is 0.3～4.65V; Measuring accuracy is 0.1%V, simultaneously has favorable linearity when 20kPa～1050kPa, and concrete output relation is as follows:
Vout＝Vs(0.01059P-0.1528)±Error
In the formula, Vs is an operating voltage, and P is an atmospheric value, and Vout is an output voltage.Vout sends into single-chip microcomputer and handles after MCP3208A/D passage 4 converts the corresponding digital amount to.
Static pressure, total head are measured the normalized current signal that adopts JYB pressure unit (0.5 grade of precision) directly the static pressure signal in the air duct to be converted to 4～20mA.Be converted into the 0-5V voltage signal, the passage 5,6 of changing MCP3208 through A/D is converted to digital quantity, and signal imports single chip microcomputer test system into.
2) referring to Figure 11 measuring wind speed
Adopt pitot tube and U.S. BESTACE micro differential pressure transmitter, model is 761-10-44A, and the tubular stainless-steel tube that a smooth air has been installed at the fan outlet place is a ventilating duct 1.Pitot tube 2 stretches into ventilating duct 1, by the move left and right of driven by motor transfer table 3 and ventilating duct 1, realizes the multiple spot measuring wind speed of air outlet optional position.The static pressure end 4 of pitot tube 2 is connected the micro differential pressure transmitter with total head end 5, pressure difference signal is converted into the normalized current signal of 4～20mA, be converted into the 0-5V voltage signal, the passage 1 of changing MCP3208 through A/D is converted to digital quantity, and signal imports single chip microcomputer test system into.
3) referring to Figure 12 torque measurement
Magneto-electric phase differential type torque sensor is installed between motor and fan shaft.Elastic shaft 6 is installed between two rotating shaft ends, two signal gear 7 is installed, one group of signal coil 8 respectively is housed above two gears at the axle two ends of elastic shaft.Magnet steel 9 all is housed in signal coil, forms the magnetoelectricity signal generator with two signal gear.When signal gear is rotated with elastic shaft, because the bottom of the inswept magnet steel of the tooth top of signal gear and tooth, paddy alternate cycle, make air-gap permeance produce periodic the variation, the magnetic flux of coil inside also produces cyclical variation, make and produce induction electromotive force in the coil, it is sinusoidal wave that its waveform is approximately.If rotating shaft is not subjected to the effect of moment of torsion, two simple sinusoidal electromotives are answered same-phase.When being subjected to torque, placing sensor is θ at a distance of the relative rotation that is the two sections of L, is the phase differential of two simple sinusoidal electromotives, cross the zero balancing shaping through the OP07 comparer, draw two square waves, again with them through 74LS32 or behind the door, the output pulsating wave is sent into the Timer T1 of AT89S52.Go out the width of phase differential pulse by single chip computer measurement, be sent to host computer, calculate torque value.
4) tachometric survey
Cover the many ROS-5P photoelectric sensors of Na with the U.S. and measure rotating speed, the reflective sheeting that superposes on the cross flow fan blade when blower fan rotates, produces one tunnel pulse relevant with rotating speed at the sensor output terminal, by single-chip microcomputer it is carried out computing, realize signals collecting rotation speed of fan.
5) temperature survey
Measure atmospheric temperature with the DS18B20 digital temperature sensor that dallas, u.s.a company produces.The measurement range of DS18B20 is-55 ℃～+ 125 ℃, and best result is distinguished and can be reached 0.0625 ℃.DS18B20 can directly read the dut temperature value, and adopts three-wire system to link to each other with single-chip microcomputer, has reduced outside hardware circuit, has low-cost and wield characteristics.
DS18B20 adopts the external power supply mode, and DQ end (2 pin) connects the P2.6 and the microprocessor communication of single-chip microcomputer.
6) noise measurement
Noise converts electric signal to through high sensitivity, non-directive electret microphone.Unevenness is less than 1.5dB in 50～14000Hz scope for the microphone frequency characteristic, and three-stage amplifier is made of amplifier LM324, adjusts the related peripheral component parameters, makes its amplitude versus frequency characte close with A weighted curve.D1, C1, R1 form the peak detection network, and its output DC is redressed and reflected the size of noise acoustic pressure, and the passage 0 of changing MCP3208 through A/D is converted to digital quantity, and signal imports single chip microcomputer test system into.Measuring principle is as shown in figure 16:
Referring to Figure 11, the cross flow fan efficiency measurement is that the output power of output power (being the power input of blower fan) with motor and blower fan is calculated gained.
Blower fan power input N=Fn/9550 (moment of torsion between F-motor and the blower fan, n-motor speed)
The blower fan output power is to be sensor measurement blast (comprise total head and static pressure, obtain by the method that multimetering is averaged) with pitot tube, calculates gained by formula.
Total head P
EntirelyBe exactly pitot tube high-pressure side pressure, by the anode of pitot tube high pressure termination little differential pressure sensor, and the negative terminal of sensor gross weight trustship low pressure end not places air, the value that pressure transducer is measured.
Static pressure P
QuietBe pitot tube low pressure end pressure, negative terminal that can be by pitot tube low pressure termination little differential pressure sensor, and the anode of sensor gross weight trustship high-pressure side not places air, the value that pressure transducer is measured.
Blower fan output power Ne=P
EntirelyQ/1000, unit are KW, fan efficiency η=P
EntirelyQ/ (1000N),
Wherein, air quantity Q=wind speed * fan outlet cross-sectional area, the m of unit
3
Wind speed
Wherein, V-mean wind speed (m/s of unit)
K-pitot tube calibration factor (getting 0.99～1.01 usually)
P
Moving-gas dynamic pressure (Pa of unit), available little differential pressure sensor records, and P
Moving=P
Entirely-P
Quiet, P
Entirely, P
QuietExpression gas total head and static pressure.
ρ-gas density (unit K g/m
3) and
P
LocalRepresent local atmospheric pressure, P
StandardRepresent a standard atmospheric pressure, t represents the gas temperature of surveying, and unit is ℃.
Referring to Figure 13, after testing process begins, by temperature, sensors such as wind speed are realized the real-time collection of various relevant parameters such as wind-warm syndrome, sensor is converted into the breadboardin signal with various physical signallings, and the analog signal transmission of the various representative respective performances parameters that will collect is given singlechip computer system, singlechip computer system is digital signal with analog signal conversion and is transferred to computing machine, computing machine is converted into corresponding performance numerical value with the various signals that received and shows on display, data are stored with performance curve simultaneously and draw, after obtaining testing result, can suspend testing.
Referring to Figure 14, senior management computer is based on the Windows2000/XP operating platform, with VisualBasic 6.0 for developing software and in conjunction with Access2000 and Crystal Report 9 fulfillment databases and form correlation function.Visual Basic 6.0 have good graphical interfaces interface, built-in numerous controls, visual Integrated Development Environment, easily software debugging environment, database access ability easily, can realize functions such as data acquisition, processing, database access, control automatically, test result demonstration, printing easily.
Master system can be divided into real time data detection module, data management module and system module is set.
System installs, operation steps is as follows:
1, install: elder generation's installation testing software on host computer, operation enters system master interface.Again cross flow fan corresponding position of sound production on test board is fixed;
2, wiring: connect cross flow fan and single-chip computer control system power supply;
3, start: operation Single-chip Controlling program, to click host computer master's interface menu " Data Detection " and enter the parameter detecting interface, the parameter detecting interface comprises data presentation, system's setting and parametric plot display part.Set the cross flow fan model that needs test and batch, click start button and begin to test;
4, stop: stopping the operation of Single-chip Controlling program, withdraw from upper test macro, power cutoff again, system work process stops fully.
Claims (7)
1. testing performance of cross flow fan system, it is characterized in that comprising sensing system, singlechip computer system, computing machine, sensing system comprises the rotation speed of fan sensor, the blower fan air velocity transducer, the wind-warm syndrome temperature sensor, barometric pressure sensor, blower fan dynamic pressure pressure transducer, blower fan static pressure sensor, the blower fan torque sensor, noise measuring set, the sensor of sensing system and measuring instrument output electric signal all are connected to singlechip computer system, singlechip computer system is core with the single-chip microcomputer, finish the conversion and the processing of data, by serial port data are sent into host computer processing and demonstration at last.
2. testing performance of cross flow fan according to claim 1 system is characterized in that singlechip computer system is a core with the AT89S52 single-chip microcomputer, mainly comprise mould/number conversion circuit, serial communication circuit, watchdog circuit and power circuit,
3. testing performance of cross flow fan according to claim 1 system, it is characterized in that the air velocity transducer structure is: the tubular stainless steel ventilating duct that a smooth air is installed at fan outlet, pitot tube one end stretches in the ventilating duct, the static pressure end of pitot tube other end output is connected the micro differential pressure transmitter with the total head end, the micro differential pressure transmitter is converted into electric signal with pressure reduction, send into singlechip computer system, ventilating duct and pitot tube all are fixed on the transfer table, the driven by motor transfer table moves, to the multimetering of fan outlet optional position.
4. testing performance of cross flow fan according to claim 1 system, it is characterized in that torque sensor is a magneto-electric phase differential type torque sensor, structure is: between motor output shaft and blower fan axle elastic shaft is installed, two signal gear are installed at axle two ends at elastic shaft, one group of signal coil respectively is equipped with in the top of two signal gear, magnet steel is housed in the signal coil, forms the magnetoelectricity signal generator with signal gear.
5. testing performance of cross flow fan according to claim 1 system is characterized in that the rotation speed of fan sensor adopts photoelectric sensor, and reflective sheeting superposes on the cross flow fan blade.
6. a testing performance of cross flow fan system and method is characterized in that rotation speed of fan sensor, blower fan air velocity transducer, torque sensor, barometric pressure sensor, blower fan dynamic pressure pressure transducer, fan static pressure pressure transducer, wind-warm syndrome temperature sensor, noise measuring set by sensing system; Gather various relevant parameters in real time, sensor and measuring instrument are converted into the breadboardin signal with various physical signallings, and the analog signal transmission of the various representative respective performances parameters that will collect is given singlechip computer system, singlechip computer system is a digital signal with analog signal conversion, the line data of going forward side by side is handled, last singlechip computer system is sent data into host computer by serial port and is handled, computing machine is converted into corresponding performance numerical value with the various signals that received and shows on display, data is stored with performance curve simultaneously and draws.
7. testing performance of cross flow fan system and method according to claim 6, the measurement that it is characterized in that cross flow fan efficient is by measuring output power of motor and blower fan output power gained, and asking for of blower fan output power is with pitot tube multimetering blast total head and blast static pressure, calculates gained.
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| CN102352865A (en) * | 2011-08-30 | 2012-02-15 | 长沙学院 | Optimal design method of cross-flow fan based on orthogonal test |
| CN102489975A (en) * | 2011-12-15 | 2012-06-13 | 湖南科技大学 | Optimization method for machining process for mine fan blade |
| CN102620879A (en) * | 2012-03-29 | 2012-08-01 | 东方电气集团东方电机有限公司 | Multichannel micro-pressure measurement system for motor ventilation model tests |
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| CN102352865A (en) * | 2011-08-30 | 2012-02-15 | 长沙学院 | Optimal design method of cross-flow fan based on orthogonal test |
| CN102489975A (en) * | 2011-12-15 | 2012-06-13 | 湖南科技大学 | Optimization method for machining process for mine fan blade |
| CN102620879A (en) * | 2012-03-29 | 2012-08-01 | 东方电气集团东方电机有限公司 | Multichannel micro-pressure measurement system for motor ventilation model tests |
| CN102966546A (en) * | 2012-11-27 | 2013-03-13 | 济南重成自动化技术有限公司 | Roots blower controller |
| CN103592460A (en) * | 2013-11-23 | 2014-02-19 | 大连尚能科技发展有限公司 | Signal conversion device of current type air velocity sensor |
| CN103925947A (en) * | 2014-04-21 | 2014-07-16 | 浙江佳宝新纤维集团有限公司 | Efficient device for quickly testing spinning wind speed and spinning temperature |
| CN104005977A (en) * | 2014-05-26 | 2014-08-27 | 杭州展德软件技术有限公司 | General fan operation parameter integration measuring method |
| CN104005977B (en) * | 2014-05-26 | 2016-03-09 | 杭州展德软件技术有限公司 | The integral measuring method of general fan operation parameter |
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| CN107044435A (en) * | 2016-05-13 | 2017-08-15 | 周卫华 | Determine air quantity intelligent control centrifugal fan |
| CN106441965A (en) * | 2016-10-08 | 2017-02-22 | 万毅 | Traffic tunnel exhaust system reliability detection method |
| CN106840284A (en) * | 2016-12-22 | 2017-06-13 | 汇众翔环保科技河北有限公司 | Based on multitube Pitot tube matrix form flow system and measuring method |
| CN107014444A (en) * | 2017-05-27 | 2017-08-04 | 山东罗泰风机有限公司 | A kind of blower fan dynamic performance parameter measuring system |
| CN107014444B (en) * | 2017-05-27 | 2023-08-29 | 山东罗泰风机有限公司 | Fan dynamic performance parameter measurement system |
| CN108120607A (en) * | 2018-03-09 | 2018-06-05 | 长沙学院 | Automotive window motor dynamics power testboard |
| CN108120607B (en) * | 2018-03-09 | 2023-12-22 | 长沙学院 | Dynamic force test board for automobile window motor |
| CN109781172A (en) * | 2018-12-10 | 2019-05-21 | 广东恒鑫智能装备股份有限公司 | A kind of wind speed and pressure detection machine |
| CN111380145A (en) * | 2020-03-19 | 2020-07-07 | 中国建筑科学研究院有限公司 | Fresh air quantity real-time monitoring method for fresh air machine |
| CN114061806A (en) * | 2020-07-30 | 2022-02-18 | 北京振兴计量测试研究所 | 1000Nm dynamic torque loading and calibration system |
| CN114061806B (en) * | 2020-07-30 | 2024-04-02 | 北京振兴计量测试研究所 | 1000Nm dynamic torque loading and calibrating system |
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