CN205719553U - Dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device - Google Patents
Dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device Download PDFInfo
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- CN205719553U CN205719553U CN201620159602.6U CN201620159602U CN205719553U CN 205719553 U CN205719553 U CN 205719553U CN 201620159602 U CN201620159602 U CN 201620159602U CN 205719553 U CN205719553 U CN 205719553U
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- air valve
- dynamic strain
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Abstract
This utility model provides a kind of dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device, motor output end is connected with rotating speed turning angle admeasuring apparatus, rotating speed turning angle admeasuring apparatus is connected with the camshaft of tested valve actuating mechanism or distribution unit, the high frequency sound dynamic strain meter being connected with dynamic strain amplifier is posted on valve actuating mechanism or distribution unit, it is provided with on valve actuating mechanism or distribution unit and is connected piezoelectric accelerometer with charge amplifier, rotating speed turning angle admeasuring apparatus, charge amplifier and dynamic strain amplifier are connected with data acquisition unit respectively, data acquisition unit is connected with computer, lubricating system provides lubricating oil to tested valve actuating mechanism or distribution cell operation, motor is connected with control system the most respectively with rotating speed turning angle admeasuring apparatus.This utility model can guarantee that the accuracy of test result, it is not necessary to complicated process equipment and expensive instrumentation, and low cost is easy and simple to handle, is generally applied the measurement of boats and ships, car combustion engine air valve and air valve seat dynamic Contact load.
Description
Technical field
This utility model relates to a kind of dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device, belongs to IC Engine Test Technology field.
Background technology
Internal combustion engine is the dynamic power machine that the application of the field such as boats and ships, automobile, power station is wide, has that the thermal efficiency is high, specific fuel consumption is low, Power coverage face big, range of speeds width, starts the advantages such as safe, easy to maintenance.But, internal combustion engine can produce bigger vibration and radiated noise in the course of the work.The vibration of internal combustion engine is not only easily reduced the reliability of self work, and can pass to other equipment by under-chassis or pedestal, thus disturbs the normal work of other equipment.The noise of internal combustion engine directly can produce infringement to environment and human body.Therefore, Low Noise Design becomes gasoline engine vibration and noise control important subject.
The percussion of air valve and air valve seat is the important vibration of internal combustion engine and noise source.The dynamics calculation of valve actuating mechanism and optimization design are to control air valve percussion vibration and the effective way of noise.Air valve is mainly realized by introducing contact stiffness and contact damping in Dynamic Calculations for Valve Train program with the calculating of air valve seat contact load.At present, air valve lacks effective measurement apparatus with the dynamic Contact load of air valve seat, which has limited the valve actuating mechanism Low Noise Design work utilizing dynamics calculation result to carry out.Therefore, air valve is set up significant for dynamics calculation and the Low Noise Design of valve actuating mechanism with the measurement apparatus of air valve seat dynamic Contact load and corresponding measuring method.
Summary of the invention
The purpose of this utility model is to provide for a kind of low cost, easy and simple to handle measuring air valve and the device of air valve seat dynamic Contact load and demarcate the device of air valve stem dynamic strain meter.
nullThe purpose of this utility model is achieved in that a kind of dynamic Contact load-measuring device，Including control system、Motor、Rotating speed turning angle admeasuring apparatus、Lubricating system、Dynamic strain amplifier、Charge amplifier、Data acquisition unit、Computer and tested valve actuating mechanism or distribution unit，The outfan of motor is connected with rotating speed turning angle admeasuring apparatus by the first shaft coupling，Rotating speed turning angle admeasuring apparatus is connected with the camshaft of tested valve actuating mechanism or distribution unit by the second shaft coupling，High frequency sound dynamic strain meter is posted in the air valve stem of described valve actuating mechanism or distribution unit and air valve head junction，Described high frequency sound dynamic strain meter is connected with dynamic strain amplifier，On the air valve head of described valve actuating mechanism or distribution unit, piezoelectric accelerometer is installed，Described piezoelectric accelerometer is connected with charge amplifier，Rotating speed turning angle admeasuring apparatus、Charge amplifier and dynamic strain amplifier are connected with data acquisition unit respectively，Data acquisition unit is connected with computer，Described lubricating system lubricating oil needed for tested valve actuating mechanism or distribution cell operation provide，Motor is connected with control system the most respectively with rotating speed turning angle admeasuring apparatus.
A kind of air valve stem dynamic strain meter caliberating device, including tested air valve, supporting cylinder head, dynamic strain amplifier, loading disc, Deng weight counterweight and stable bracing frame, described tested air valve is arranged in supporting cylinder head, cylinder head is upside down on stable bracing frame, described tested air valve stem and air valve head connecting portion post high frequency sound dynamic strain meter, the cable of described high frequency sound dynamic strain meter is connected to dynamic strain amplifier after being drawn by air intake duct or exhaust duct, described tested air valve is directly connected with loading disc, by realizing the demarcation of air valve stem dynamic strain meter at weight counterweights such as loading disc loading and unloadings.
This utility model also includes so some architectural features:
1. the highest response frequency of high frequency sound dynamic strain meter is not less than 20kHz；The highest response frequency of piezoelectric accelerometer is not less than 20kHz, and accelerometer quality is not more than the air valve quality of 1/100.
2. dynamic strain amplifier, charge amplifier are not less than 20kHz with the single channel bandwidth of data acquisition unit.
3. total number of times that loads is no less than 20 times, the maximum load spring for valve pretightning force not less than 4 times, and the spring for valve pretightning force of no more than 6 times.
Compared with prior art, the beneficial effects of the utility model are: the device that (1) this utility model provides achieves the measurement of Diesel Engine's Air Valve and air valve seat dynamic Contact load, and measurement result may be used for the checking of I. C engine distribution mechanism dynamics calculation result, dynamics Optimization Design and Low Noise Design.(2) device that this utility model provides uses strain gauge and the highest response frequency of accelerometer are not less than 20kHz, the single channel bandwidth of dynamic strain amplifier, charge amplifier and data acquisition unit is not less than 20kHz, it is to avoid the leakage of high-frequency percussion component；Accelerometer quality is not more than the air valve quality of 1/100, effectively controls the impact of accelerometer additional mass.Test device ensure that the precision of test result.(3) device that this utility model provides utilizes motor towing astern to drive the operation of valve actuating mechanism, high frequency sound dynamic strain meter and piezoelectric accelerometer is used to measure, need not the process equipment of complexity and expensive instrumentation, testing cost is low, and easy and simple to handle, it is widely used in the measurement of boats and ships, car combustion engine air valve and air valve seat dynamic Contact load.
Accompanying drawing explanation
Fig. 1 is the measurement apparatus schematic diagram of Diesel Engine's Air Valve of the present utility model and air valve seat dynamic Contact load；
Fig. 2 is the caliberating device schematic diagram of Diesel Engine's Air Valve bar strain gauge of the present utility model；
Wherein: 1-control system, 2-motor, 3-shaft coupling, 4-rotating speed turning angle admeasuring apparatus, 5-camshaft, 6-driving-chain, 7-air valve, 8-air valve stem strain gauge, 9-dynamic strain amplifier, 10-piezoelectric accelerometer, 11-charge amplifier, 12-data collecting instrument, 13-computer, 14-lubricating system, the tested valve actuating mechanism of 15-or distribution unit, 16-cylinder head, 17-bracing frame, 18-loading disc, 19-counterweight.
Detailed description of the invention
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, motor 2 is connected with rotating speed turning angle admeasuring apparatus 4 by shaft coupling 3, rotating speed turning angle admeasuring apparatus 4 is connected with the camshaft 5 of tested valve actuating mechanism or distribution unit 15 by shaft coupling 3.The startup of motor 5, stopping and rotational speed regulation is realized by control system 1.The transient speed of camshaft 5 is fed back to control system 1 by rotating speed turning angle admeasuring apparatus 4, and the angular signal of camshaft 5 is passed to data acquisition unit 12.Camshaft 5 drives air valve 7 to work by distribution unit transfer chain 6.Posting strain gauge 8 on air valve 7, the dynamic strain signal of air valve 7 is passed to dynamic strain amplifier 9 by strain gauge 8, then passes to data acquisition unit 12.Air valve 7 bottom surface is stained with acceleration 10, and the acceleration of motion signal of air valve 7 is passed to charge amplifier 11 by accelerometer 10, then passes to data acquisition unit 12.The angular signal of camshaft 5 collected, the dynamic strain signal of air valve 7, the acceleration of motion signal of air valve 7 are passed to computer 13 and process by data acquisition unit 12.The lubricating condition needed for running is provided to tested valve actuating mechanism or distribution unit by lubricating system 14.
As in figure 2 it is shown, air valve 7 is arranged in supporting cylinder head 16, and cylinder head 16 is upside down on stable bracing frame 17.Posting strain gauge 8 on air valve 7, the static strain signal of air valve 7 is passed to dynamic strain amplifier 9 by strain gauge 8.Air valve 7 top is directly connected with loading disc 18.By loading on loading disc 18 and the weight counterweight 19 such as unloading realizes the demarcation of strain gauge 8 on air valve 7.
This utility model following measuring technology scheme of employing:
Diesel Engine's Air Valve is made up of control system, motor, rotating speed turning angle admeasuring apparatus, shaft coupling, lubricating system, high frequency sound dynamic strain meter, dynamic strain amplifier, piezoelectric accelerometer, charge amplifier, data acquisition unit, computer and tested valve actuating mechanism or distribution unit with the measurement apparatus of air valve seat dynamic Contact load.
Motor is connected with rotating speed turning angle admeasuring apparatus by shaft coupling, and rotating speed turning angle admeasuring apparatus is connected with the camshaft of tested valve actuating mechanism or distribution unit by shaft coupling, thus drives camshaft to rotate.The startup of motor, stopping and rotational speed regulation is realized by control system.The camshaft transient speed monitored is fed back to control system by rotating speed turning angle admeasuring apparatus, and the angular signal monitored is passed to data acquisition unit.The air valve stem of described valve actuating mechanism or distribution unit and air valve head connecting portion post high frequency sound dynamic strain meter, and the highest response frequency of strain gauge is not less than 20kHz.Described high frequency sound dynamic strain meter is connected with dynamic strain amplifier, and strain signal is passed to data acquisition unit by dynamic strain amplifier.On the air valve head of described valve actuating mechanism or distribution unit, piezoelectric accelerometer is installed.The highest response frequency of accelerometer is not less than 20kHz, and accelerometer quality is not more than the air valve quality of 1/100.The air valve acceleration of motion signal that measurement is obtained by described piezoelectric accelerometer passes to charge amplifier, charge amplifier and data acquisition unit, data acquisition unit is connected with computer, gathers and process camshaft degree signal, air valve stem strain signal and air valve acceleration of motion signal.Dynamic strain amplifier, charge amplifier are not less than 20kHz with the single channel bandwidth of data acquisition unit.By lubricating system lubricating oil needed for tested valve actuating mechanism or distribution cell operation provide.
The device that this utility model provides is measured by the demarcation of air valve stem strain gauge, camshaft speed outer corner measurement, air valve stem dynamic force measurement, air valve acceleration of motion, air valve calculates the measurement realizing air valve with the dynamic Contact load of air valve seat with air valve seat contact load, specific as follows:
Air valve stem strain gauge is demarcated: high frequency sound dynamic strain meter being pasted onto air valve stem and air valve head connecting portion, then is installed back by air valve in cylinder head, valve actuating mechanism or other parts of distribution unit are not installed.Strain gauge signal cable is drawn by air intake duct or exhaust duct outlet, and is connected with dynamic strain amplifier.Cylinder head being upside down on stable bracing frame, air valve stem is directly connected with loading disc.The gradually weight such as loading counterweight on loading disc, record loads gross mass and the reading of dynamic strain amplifier every time.Total number of times that loads is no less than 20 times, and maximum load is not less than the spring for valve pretightning force of 4 times, and the spring for valve pretightning force of no more than 6 times.Loading carries out unloading immediately after being measured and measures, i.e. the gradually weight such as unloading counterweight on loading disc, and records and load gross weight and dynamic strain amplifier reading every time.Arrange and load and the data of unloading record, utilize least-squares algorithm linear fitting to be calculated the relation of air valve stick force and corresponding compliance voltage signal, i.e. sensitivity coefficient s.
Camshaft speed outer corner measurement: motor output shaft is connected with rotating speed turning angle admeasuring apparatus by shaft coupling, then be connected with camshaft by shaft coupling.The camshaft transient speed monitored is fed back to control system by rotating speed turning angle admeasuring apparatus, and the angular signal D monitored is passed to data acquisition unit.Under same rotating speed, the measurement of camshaft degree signal D and air valve acceleration of motion signal A and air valve stem compliance voltage signal U is Tong Bu carried out.
Air valve stem dynamic force measurement: valve actuating mechanism or all parts of distribution unit are assemblied on body or cylinder head according to practical set condition, the signal cable of air valve stem strain gauge is drawn by air intake duct or exhaust duct outlet, and is connected with dynamic strain amplifier.The outfan of dynamic strain amplifier is connected with the input of data acquisition unit.Data acquisition unit is connected with computer, gathers and process air valve stem compliance voltage signal U.According to relational expression FS=s × U is calculated dynamic force F between air valve stem and air valve headS。
Air valve acceleration of motion is measured: valve actuating mechanism or all parts of distribution unit are assemblied on body or cylinder head according to practical set condition, piezoelectric accelerometer is posted in air valve head bottom surface, the outgoing cable of accelerometer is connected with charge amplifier, charge amplifier is connected with data acquisition unit, data acquisition unit is connected with computer, gathers and process the acceleration of motion signal A of air valve.
Air valve calculates with air valve seat contact load: according to relational expression FM=m × A is calculated the inertia force F of air valve headM.Wherein, m is the quality of air valve head.Further according to relational expression FI=FS+FMIt is calculated dynamic Contact load F of air valve and air valve seatI
For measuring the device of Diesel Engine's Air Valve and air valve seat dynamic Contact load, including control system, motor, rotating speed turning angle admeasuring apparatus, shaft coupling, lubricating system, high frequency sound dynamic strain meter, dynamic strain amplifier, piezoelectric accelerometer, charge amplifier, data acquisition unit, computer and tested valve actuating mechanism or distribution unit, the air valve stem of described tested valve actuating mechanism or distribution unit and air valve head connecting portion post high frequency sound dynamic strain meter, and air valve head bottom surface is stained with piezoelectric accelerometer.Described high frequency sound dynamic strain meter is connected with dynamic strain amplifier, is then connected to data acquisition unit.Described piezoelectric accelerometer is connected with charge amplifier, is then connected to data acquisition unit.The highest response frequency of described high frequency sound dynamic strain meter and piezoelectric accelerometer is not less than 20kHz, and described dynamic strain amplifier, charge amplifier are not less than 20kHz with the single channel bandwidth of data acquisition unit；The quality of described piezoelectric accelerometer is not more than the air valve quality of 1/100.Described high frequency sound dynamic strain meter is used for dynamic force F measuring air valve stem with air valve head connecting portionS, described piezoelectric accelerometer is used for measuring acceleration of motion A of air valve, by dynamic force FSWith air valve head inertia force FMAlgebraical sum be calculated dynamic Contact load F of air valve and air valve seatI。
By demarcating the device based on air valve stem dynamic strain, including tested air valve, supporting cylinder head, dynamic strain amplifier, loading disc, etc. weight counterweight and stable bracing frame, described tested air valve is arranged in supporting cylinder head, and cylinder head is upside down on stable bracing frame.Described tested air valve stem and air valve head connecting portion post high frequency sound dynamic strain meter, and the cable of described high frequency sound dynamic strain meter is drawn by air intake duct or exhaust duct, is connected to dynamic strain amplifier.Described tested air valve is directly connected with loading disc, by realizing the demarcation of air valve stem dynamic strain meter at weight counterweights such as loading disc loading and unloadings.Total number of times that loads is no less than 20 times, and maximum load is not less than the spring for valve pretightning force of 4 times, and the spring for valve pretightning force of no more than 6 times.
This utility model belongs to IC Engine Test Technology field, uses the combined test scheme of high frequency sound dynamic strain meter and piezoelectric accelerometer to realize the measurement of Diesel Engine's Air Valve and air valve seat dynamic Contact load.Use dynamic force F of high frequency sound dynamic strain measurement amount air valve stem and air valve head connecting portionS, use piezoelectric accelerometer to measure acceleration of motion A of air valve, by dynamic force FSWith air valve head inertia force FMAlgebraical sum be calculated the dynamic Contact load of air valve and air valve seat.The highest response frequency of strain gauge and accelerometer is not less than 20kHz, dynamic strain amplifier, charge amplifier are not less than 20kHz with the single channel bandwidth of data acquisition unit, it is to avoid the leakage of high-frequency percussion component；Accelerometer quality is not more than the air valve quality of 1/100, effectively controls the impact of accelerometer additional mass.The measurement apparatus that this utility model provides ensure that the accuracy of test result, set up measurement apparatus of the present utility model and need not the process equipment of complexity and expensive instrumentation, testing cost is low, and easy and simple to handle, it is widely used in the measurement of boats and ships, car combustion engine air valve and air valve seat dynamic Contact load.
Claims (5)
- null1. a dynamic Contact load-measuring device，It is characterized in that: include control system、Motor、Rotating speed turning angle admeasuring apparatus、Lubricating system、Dynamic strain amplifier、Charge amplifier、Data acquisition unit、Computer and tested valve actuating mechanism or distribution unit，The outfan of motor is connected with rotating speed turning angle admeasuring apparatus by the first shaft coupling，Rotating speed turning angle admeasuring apparatus is connected with the camshaft of tested valve actuating mechanism or distribution unit by the second shaft coupling，High frequency sound dynamic strain meter is posted in the air valve stem of described valve actuating mechanism or distribution unit and air valve head junction，Described high frequency sound dynamic strain meter is connected with dynamic strain amplifier，On the air valve head of described valve actuating mechanism or distribution unit, piezoelectric accelerometer is installed，Described piezoelectric accelerometer is connected with charge amplifier，Rotating speed turning angle admeasuring apparatus、Charge amplifier and dynamic strain amplifier are connected with data acquisition unit respectively，Data acquisition unit is connected with computer，Described lubricating system lubricating oil needed for tested valve actuating mechanism or distribution cell operation provide，Motor is connected with control system the most respectively with rotating speed turning angle admeasuring apparatus.
- A kind of dynamic Contact load-measuring device the most according to claim 1, it is characterised in that: the highest response frequency of high frequency sound dynamic strain meter is not less than 20kHz；The highest response frequency of piezoelectric accelerometer is not less than 20kHz, and accelerometer quality is not more than the air valve quality of 1/100.
- A kind of dynamic Contact load-measuring device the most according to claim 1 and 2, it is characterised in that: dynamic strain amplifier, charge amplifier are not less than 20kHz with the single channel bandwidth of data acquisition unit.
- 4. an air valve stem dynamic strain meter caliberating device, it is characterized in that: include tested air valve, supporting cylinder head, dynamic strain amplifier, loading disc, Deng weight counterweight and stable bracing frame, tested air valve is arranged in supporting cylinder head, cylinder head is upside down on stable bracing frame, tested air valve stem and air valve head connecting portion post high frequency sound dynamic strain meter, the cable of high frequency sound dynamic strain meter is connected to dynamic strain amplifier after being drawn by air intake duct or exhaust duct, tested air valve is directly connected with loading disc, by realizing the demarcation of air valve stem dynamic strain meter at weight counterweights such as loading disc loading and unloadings.
- A kind of air valve stem dynamic strain meter caliberating device the most according to claim 4, it is characterised in that: total number of times that loads is no less than 20 times, and maximum load is not less than the spring for valve pretightning force of 4 times, and the spring for valve pretightning force of no more than 6 times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620159602.6U CN205719553U (en) | 2016-03-02 | 2016-03-02 | Dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620159602.6U CN205719553U (en) | 2016-03-02 | 2016-03-02 | Dynamic Contact load-measuring device and air valve stem dynamic strain meter caliberating device |
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| CN205719553U true CN205719553U (en) | 2016-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606366A (en) * | 2016-03-02 | 2016-05-25 | 哈尔滨工程大学 | Device for measuring dynamic contact load of air valve and air valve seat and device for calibrating dynamic strain meter of air valve stem |
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2016
- 2016-03-02 CN CN201620159602.6U patent/CN205719553U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606366A (en) * | 2016-03-02 | 2016-05-25 | 哈尔滨工程大学 | Device for measuring dynamic contact load of air valve and air valve seat and device for calibrating dynamic strain meter of air valve stem |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20190302 |