CN202403791U

CN202403791U - Portable gear drive noise testing system

Info

Publication number: CN202403791U
Application number: CN2011205214742U
Authority: CN
Inventors: 陈洪芳; 石照耀; 杨森元
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2011-12-14
Filing date: 2011-12-14
Publication date: 2012-08-29
Anticipated expiration: 2021-12-14

Abstract

The utility model discloses a portable gear drive noise testing system and belongs to the technical field of detection equipment. Microphones are connected with front amplifiers which are used for converting impedance; output interfaces of the front amplifiers are connected with a filtering module; the output of the filtering module is connected with a voltage follower; the output of the voltage follower is connected with the input interface of an analog-to-digital (AD) chip; the output data line of the AD chip s connected with a field programmable gate array (FPGA) which is used for address decoding; the FPGA module is connected with a data bus of the digital signal processor (DSP) which is used for processing data; the data bus and the address bus of the DSP are connected with an outward expanded synchronous dynamic random access memory (SDRAM); a serial communication interface (SCI) of the DSP is connected with a main control advanced reduced instruction-set computer (RISC) machine (ARM) chip for controlling commands through an MAX3232 chip; the data bus and the address bus of the ARM module are connected with an outward expanded random access memory (RAM); and the data bus of the ARM is connected with a touch screen. The portable gear drive noise testing system has the advantages of small size, light weight, high acquisition speed and large data storage capacity, and can analyze data accurately and reliably.

Description

A kind of portable gear transmission noises test macro

Technical field

The utility model relates to a kind of portable gear transmission noises test macro, is used for the mate gear rolling inspection machine gear quality of Gear Production process is detected, and belongs to the checkout equipment technical field.

Background technology

Contain abundant engagement information in the rotational noise of gear and the vibration signal, judge through the rotational noise of analyzing gear whether the qualified gear that become detects a kind of very important means to gear.The noise signal analysis instrument that the spur roller gear inspection machine of domestic production does not match, external corresponding product (like Gleason) price is relatively more expensive again; Domestic Gear Production producer still relies on the rotational noise that the workman by virtue of experience removes " listening " gear, judges whether gear is qualified, and this method receives artificial factor bigger.People such as the external Egyptian A Lewang Sameh M.Metwalley of university utilize microphone to accomplish the measurement to the gear case noise signal; Their designed system can be accomplished the noise measurement of 6 road signals, but this system still needs host computer that the gear transmission noises signal is analyzed, and does not have portable function.Domestic general use vibration signal replaces noise signal to measure, and calculates the foozle that sound pressure level is analyzed gear housing.

Chinese patent document 200910250322.0 disclosed a kind of portable rotational noise testers that are applicable to control bevel gear meshing quality comprise noise probe, cpu central processing unit, filter amplification circuit, analog to digital conversion (AD) circuit, display circuit and keyboard, sequential control circuit, memory circuitry, serial bus interface circuit; Be mainly used in the bevel gear quality Control during Production.This method is through gathering one tunnel noise signal, the quality that the line data analysis of going forward side by side comes the detection cone gear; What the display part of this system was used is the LCD liquid crystal display, and screen can not show the total data point of gathering when the data of measurement result are carried out graphic presentation intuitively.System carries out data processing with data transmission to host computer through serial ports, does not thoroughly break away from the dependence to microcomputer.This system just is applied to this method in the bevel gear quality testing, does not relate to the detection of cylindrical gear.

Summary of the invention

In order to develop the portable gear testing system that a cover generally is applicable to the Gear Processing industry, thoroughly break away from dependence to host computer, the utility model provides a kind of portable gear transmission noises test macro.

To achieve these goals; The utility model has been taked following technical scheme: a kind of portable grating of gears test macro that is used for the quality testing of Gear Production process comprises microphone and link to each other with microphone supporting prime amplifier, filtering circuit, amplifying circuit, A/D convertor circuit, DSP modular circuit, ARM processing module; Microphone is connected with the prime amplifier that carries out impedance conversion; The output interface of prime amplifier links to each other with filtration module; The output of filtration module connects voltage follower; The output of voltage follower links to each other with the input interface of the AD chip that carries out the AD conversion simultaneously, and the output data line of AD is connected with the FPGA that carries out address decoding, and the FPGA module is connected with the DSP data bus that carries out data processing; The data bus of DSP is connected with the SDRAM that extends out with address bus simultaneously; The SCI interface of DSP is connected with the master control ARM chip that carries out order control through the MAX3232 chip, and the data bus of ARM module is connected with the RAM that extends out with address bus, and the data bus of ARM is connected with touch-screen.

Described microphone and coupled supporting prime amplifier are that three tunnel, three road prime amplifiers all link to each other with the AD chip that carries out the AD conversion, can realize the synchronized sampling of three road microphones to the gear transmission noises signal; Use the invalid radio-frequency component in the low-pass filter circuit filtering gear transmission noises signal.

This system is two CPU designs, uses the connection mode of principal and subordinate's machine, and wherein ARM is as main frame, and DSP is as slave.

Wherein signal transducer comprises three microphones and three supporting prime amplifiers, uses after the collection to three tunnel grating of gears signals, and prime amplifier carries out impedance conversion, improves input impedance, reduces output impedance; Filtering circuit partly adopts Butterworth LPF, and its main advantage is in passband very smooth, is applicable to the detection of grating of gears signal; Filtered signal is linked to each other with the data bus of DSP behind the address decoding of FPGA by high speed parallel interface after carrying out the AD conversion by the AD chip.DSP changes the 16 system digital signals of gathering; And calculate magnitude of voltage corresponding with it; And carry out FFT conversion and power spectrum analysis of spectrum in DSP inside; Data after analyzing are passed to the ARM module with raw data carry out further data analysis and comprise refinement spectrum and cepstrum analysis, draw last conclusion by three road set signalling comprehensives.

The storer of the utility model mainly comprises: in the DSP module extend out SDRAM and FLASH mainly accomplishes program and data storage, the pre-service of carrying out data for DSP provides storage space; The DSP module is through the memory function that realizes USB flash disk of writing to the USB chip driver program; Extend out SDRAM as spatial cache in the ARM module.Designed SD card memory circuit simultaneously, can realize the storage of mass data, convenient tracing to the source the gear transmission noises signal.

Utilize a kind of portable grating of gears test macro of the utility model design, when the mate gear rolling inspection machine detected, method of application was as follows:

1) with the sensitivity of acoustic calibrator calibration microphone;

2) three road microphones are installed on the spur roller gear inspection machine apart from point of mesh 50cm place;

3) open the power switch of instrument, get into the start login interface, password is landed in input;

4) each basic parameter of input gear: the driving wheel number of teeth, the engaged wheel number of teeth, driving wheel rotating speed, modulus etc.;

5) when uneasy toothing wheel set, carry out one-shot measurement as background noise, the signal of gathering is preserved;

6) behind the tested gear pair of installation, start rolling inspection machine, gather three road signals and preservation;

7) gather to accomplish after, institute collection gear transmission noises signal is carried out difference processing, thereby whether analyze tested gear qualified;

The utility model utilizes ARM chip and touch-screen that the grating of gears signal is carried out graphic presentation, can reflect the frequecy characteristic of gear transmission noises signal intuitively; Carried out writing of ZFFT algorithm in the ARM chip, the instrument that makes has been broken away from the dependence to host computer.The setting of triple channel noise signal sampling can be carried out the location of noise source with cross correlation function.

The utility model can use by the mate gear rolling inspection machine, and the analysis through to the multiplexed gear noise signal detects gear quality.The utility model is provided with storage of SD card and USB flash disk memory module, can store experimental data, so that later on noise signal is traced to the source.

The utility model is as dual core embedded system, uses the control model of principal and subordinate's machine, improved the processing speed to noise signal greatly, simultaneously its advantage such as to have a volume little, in light weight, and acquisition rate is fast, and memory data output is big, and data analysis is accurately credible.In actual production, the mate gear rolling inspection machine will improve work efficiency of workers and accuracy when using greatly, has very strong practical value.

Description of drawings

Fig. 1 is the profile synoptic diagram (front elevation) of native system;

Fig. 2 is the one-piece construction block diagram of native system;

Fig. 3 is a native system analog to digital conversion circuit schematic diagram;

Fig. 4 is native system USB storage and communication module schematic diagram;

Fig. 5 is a native system SD card memory circuit schematic diagram;

Fig. 6 is native system ARM and touch screen interface circuit theory diagrams;

Among Fig. 1: 1, microphone, 2, prime amplifier, 3, BNC connector, 4, attaching plug, 5, power switch, 6, touch display screen, 7, SD card slot, 8, USB interface, 9, serial communication interface, 10, power light.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated:

Be illustrated in figure 1 as the profile synoptic diagram of the utility model; 1 " ear " as native system among the figure is key one ring that obtains noise signal, and its performance just will directly influence the correctness of native system measurement result, and the sampling precision of total system can not be higher than the precision of microphone.The microphone that native system adopts is Zhejiang Aiwa's an AWA14423 type condenser microphone.2 are depicted as the prime amplifier supporting with microphone among the figure, and it mainly acts on and is: improve input impedance, reduce output impedance.Among the figure 3, shown interface is a bnc interface, and it can be easily and the signal wire link of microphone.4 is attaching plug among the figure, considers on-the-spot versatility, and the power supply that we select is that the direct supply of 220V commentaries on classics 24V is the native system power supply; The voltage of 24V can be microphone and ARM module for power supply, and the circuit board of system is provided with voltage transformation module, can be with the voltage transitions of 24V ± voltage of 12V and ± 5V.Wherein ± 12V voltage is that AD7656 supplies power; The voltage of ± 5V is that filtering chip is supplied power; The 5V voltage transitions is that 3.3V is DSP, and fpga chip is supplied power.Among the figure 5 with figure in 10 be the power switch and the power light of native system, be used for controlling the power supply of total system.6 are depicted as touch-screen among the figure, are responsible for the graphic presentation of parameter input and analysis result.7 is SD card storage slot among the figure, mainly is responsible for the storage of test figure; 8 is USB interfaces among the figure, is used for carrying out the storage of USB communication and USB flash disk.9 is serial ports among the figure, can realize the communication between this instrument and computer, satisfies the work requirements of different occasions.Ground at instrument is furnished with air vent, and the rear panel of instrument is equipped with fan, the main heat radiation of being responsible for when instrument is opened for a long time; Prevent to influence the accuracy of measurement result owing to temperature is too high.

The utility model instance is the master-slave structure that two CPU build, and the cpu chip of using is the TMS320F2812 of TI company and the ARMS3C2440 of Samsung.The DSP subsystem by power circuit, JTAG artificial circuit, extend out SDRAM, expansion IO mouth, crystal oscillating circuit and reset circuit etc. and form.The ARM subsystem partly is made up of power-switching circuit, clock circuit, memory circuit, standard RS232 interface circuit, standard RS485 interface circuit, touch screen control circuit etc.

The block diagram of total system is as shown in Figure 2; Three road microphones are gathered the noise signal in the gear drive process; Give filtering circuit through the signal behind the prime amplifier and carry out Filtering Processing, the signal behind the LPF carries out address decoding through the digital signal of AD conversion in FPGA, by DSP the data of sampling is carried out preliminary Algorithm Analysis; And through the SCI interface data are passed to the ARM module and further handle, and carry out result's demonstration.

Two each 50cm places up and down that are placed on meshing gear are arranged in three road microphones, and another one is placed on meshing gear one side 50cm place.Placement can reduce because the influence that operating personnel or machinery and equipment produce measurement result the reflection of noise like this.In addition, sound-absorbing material such as asbestos all is housed on sensing chamber's wall of general gear and reduces the influence of echo measurement result.

Filtering circuit is the low-pass filter that utilizes MAX274 to be provided with.The rotating speed of the driving wheel of spur roller gear inspection machine gear is 700～1500 rpms; The number of teeth of X-gear possibly be 8 teeth; At this moment the gear meshing frequency is 93Hz; Along with the increase of the gear number of teeth and rotating speed, the gear meshing frequency is also increasing, but the gear meshing frequency is generally below 1KHz; The useful signal of analyzing is 2～5 frequency multiplication places of meshing frequency, and the cutoff frequency of the low-pass filter that therefore is provided with is 6KHz.

As shown in Figure 3, the AD conversion portion of the utility model is to be realized by the AD that DSP control extends out.The synchronized sampling of main completion three road signals and the transmission of data.Signal after the AD conversion sends DSP to through behind the address decoding of FPGA, and in DSP, realizes fft algorithm.Realize the synchronized sampling of three road signals, the CONVSTA of AD chip, CONVSTB need put height simultaneously or put low; Wherein CONVSTA is responsible for the synchronized sampling of the 1st, 2 passages, and CONVSTB is responsible for the 3rd passage.The scope of AD sampling is by the control of RANGE pin, we can according to demand with this position high or put hang down realize input voltage range ± 10V and ± change between the 5V.

Fig. 4 and Fig. 5 are the data storage parts of the utility model.Fig. 4 is the circuit design of USB communication module.This circuit realizes that mainly function is USB flash disk storage and USB communication, mainly accomplishes communicating by letter between the utility model and the other system.Fig. 5 is a SD card memory module, under the satisfied test condition at the scene, and the requirement of the storage of mass data.The data that the scene records can directly store in the SD card, and need not pass in the host computer; Minimizing thoroughly realizes the portable function of the utility model to the dependence of host computer.

Shown in Figure 6 is the principle assumption diagram of ARM and touch-screen, and wherein XM, YM, XP, YP are the touch-screen position control signals; LED1+, LED1-, LED0+, LED0-are the LED power supply signals of touch-screen; LCD_PWREN is the control signal that enables of touch-screen; VD0～VD23 is the data line of ARM and touch-screen communication; VCLK is the pixel clock signal of lcd controller and driver, and lcd controller is seen data off in the VCLK rising edge; VFRAM is vertical synchronizing signal (frame synchronizing signal), is used for indicating the beginning of a new two field picture; VLINE is a horizontal-drive signal, is used for representing the beginning of a new line scan signals; LEND is the line scanning end signal, is used for representing the lcd driver one-row pixels end of scan; VM is a data enable signal.

Claims

1. portable gear transmission noises test macro comprises microphone and link to each other with microphone supporting prime amplifier, filtering circuit, amplifying circuit, A/D convertor circuit, DSP modular circuit, ARM processing module; It is characterized in that: microphone is connected with the prime amplifier that carries out impedance conversion; The output interface of prime amplifier links to each other with filtration module; The output of filtration module connects voltage follower; The output of voltage follower links to each other with the input interface of the AD chip that carries out the AD conversion simultaneously, and the output data line of AD is connected with the FPGA that carries out address decoding, and the FPGA module is connected with the DSP data bus that carries out data processing; The data bus of DSP is connected with the SDRAM that extends out with address bus simultaneously; The SCI interface of DSP is connected with the master control ARM chip that carries out order control through the MAX3232 chip, and the data bus of ARM module is connected with the RAM that extends out with address bus, and the data bus of ARM is connected with touch-screen.

2. a kind of portable gear transmission noises test macro as claimed in claim 1 is characterized in that: described microphone and coupled supporting prime amplifier are that three tunnel, three road prime amplifiers all link to each other with the AD chip that carries out the AD conversion.

3. a kind of portable gear transmission noises test macro as claimed in claim 2 is characterized in that: can realize the synchronized sampling of three road microphones to the gear transmission noises signal; Use the invalid radio-frequency component in the low-pass filter circuit filtering gear transmission noises signal.

4. a kind of portable gear transmission noises test macro as claimed in claim 1 is characterized in that: this system is two CPU designs, uses the connection mode of principal and subordinate's machine, and wherein ARM is as main frame, and DSP is as slave.