阅读说明：本技术 一种基于模糊控制理论的高升率水锤波发生器及其工作方法 (Fuzzy control theory-based high-lift-rate water hammer generator and working method thereof ) 是由 郭克伟 李志鹏 鲁小强 黄世朋 王永胜 王永芝 沈博 张磊 葛赛 于 2020-11-25 设计创作，主要内容包括：本发明提出了一种基于模糊控制理论的高升率水锤波发生器及其工作方法,包括液压泵,液压泵依次通过过滤器和第一单向阀与液压脉冲发生装置相连通且第一单向阀与液压脉冲发生装置之间设置有蓄能装置,液压脉冲发生装置与增压器相连通,增压器通过第二单向阀与补油管路相连通；所述液压脉冲发生装置与上位机相连接。本发明利用蓄能器组合液压脉冲发生装置整体实现了压力上升速率高、压力上升速率可控可调的效果,通过调节压力上升速率实现液压元件的压力疲劳寿命试验,为重要液压元件工艺改进、设计定型、研究开发提供重要数据支持。(The invention provides a high-lift-rate water hammer generator based on a fuzzy control theory and a working method thereof, and the high-lift-rate water hammer generator comprises a hydraulic pump, wherein the hydraulic pump is communicated with a hydraulic pulse generating device through a filter and a first one-way valve in sequence, an energy storage device is arranged between the first one-way valve and the hydraulic pulse generating device, the hydraulic pulse generating device is communicated with a supercharger, and the supercharger is communicated with an oil supplementing pipeline through a second one-way valve; the hydraulic pulse generating device is connected with an upper computer. The invention utilizes the accumulator to combine the hydraulic pulse generating device to integrally realize the effects of high pressure rising rate and controllable and adjustable pressure rising rate, realizes the pressure fatigue life test of the hydraulic element by adjusting the pressure rising rate, and provides important data support for the process improvement, design and research and development of important hydraulic elements.)

1. A high-lift-rate water hammer generator based on a fuzzy control theory is characterized by comprising a hydraulic pump (1), wherein the hydraulic pump (1) is communicated with a hydraulic pulse generating device sequentially through a filter (2) and a first one-way valve (4), an energy storage device is arranged between the first one-way valve (4) and the hydraulic pulse generating device, the hydraulic pulse generating device is communicated with a supercharger (11), and the supercharger (11) is communicated with an oil supplementing pipeline through a second one-way valve (12); the hydraulic pulse generating device is connected with an upper computer.

2. The fuzzy control theory based high-lift-rate water hammer wave generator of claim 1, the hydraulic pulse generator is characterized by comprising a servo valve (9), a bypass valve (8) and a reversing valve (10), wherein a hydraulic pump (1) is respectively communicated with oil inlets of the bypass valve (8) and the servo valve (9) sequentially through a filter (2) and a first one-way valve (4), oil outlets of the bypass valve (8) and the servo valve (9) are respectively communicated with an oil inlet of the reversing valve (10), an oil outlet of the reversing valve (10) is communicated with a supercharger (11), an oil return port of the servo valve (9) and an oil return port of the reversing valve (10) are respectively communicated with an oil return pipeline, the oil return pipeline is respectively communicated with an overflow valve (3) and an oil source through an oil return valve (13), and the overflow valve (3) is respectively communicated with the filter (2) and the first one-way valve (4); the bypass valve (8), the servo valve (9) and the reversing valve (10) are all connected with an upper computer; and an energy storage device is arranged between the first one-way valve (4) and the bypass valve (8) as well as between the first one-way valve and the servo valve (9).

3. The fuzzy control theory-based high-lift-rate water hammer generator according to claim 1 or 2, characterized in that the energy storage device comprises an energy storage group (5), a pressure gauge (7) is arranged on one side of the energy storage group (5), the energy storage group (5) is respectively communicated with the bypass valve (8), an oil inlet of the servo valve (9), the oil drain valve (6) and the first one-way valve (4), and the oil drain valve (6) is respectively communicated with the first one-way valve (4), the bypass valve (8) and an oil inlet of the servo valve (9).

4. The operating method of the high-lift-rate water hammer wave generator based on the fuzzy control theory as claimed in claim 3, characterized by comprising the steps of:

s1, firstly, introducing hydraulic oil through a hydraulic pump (1), sequentially passing through a filter (2) and a first one-way valve (4), sending the hydraulic oil into a hydraulic pulse generating device, sending the hydraulic oil into a supercharger (11) by the hydraulic pulse generating device, sending the hydraulic oil into a tested workpiece by the action of a piston of the supercharger (11), and supplementing oil into the supercharger (11) through an oil supplementing pipeline in the test process;

s2, in the working pressure stabilizing section and the back pressure section of the pulse curve, the oil source stores the hydraulic energy into the accumulator group (5); in the ascending section, the energy accumulator group (5) releases the stored hydraulic energy to the hydraulic pulse generating device to enable the hydraulic pulse generating device to generate a required ascending slope and a peak value, and meanwhile, the upper computer controls the ascending slope and the peak value of a waveform by controlling the size of throttling openings of a bypass valve (8), a servo valve (9) and a reversing valve (10) in the hydraulic pulse generating device;

s3, according to the step S2, when the pressure rising rate required by the test is not high and the flow control of the servo valve can meet the requirements of the rising slope and the peak value of the test, controlling the reversing valve (10) to be in the left position through the upper computer to enable the pipeline to be in a communicated state, and then adjusting the size of the throttling opening of the servo valve (9) through the upper computer to control the rising slope and the peak value of the waveform;

s4, according to the step S2, when the pressure rising rate required by the test is high and the flow control of the servo valve (9) can not meet the requirements of the rising slope and the peak value, the upper computer controls the bypass valve (8) to open, the servo valve (9) to close, then controls the reversing valve (10) to act, observes the conditions of the pressure rising rate and the peak value, repeatedly adjusts the size of the throttling opening of the servo valve (9) until the flow of the servo valve (9) meets the requirements of the test rising slope and the peak value, fixes the size of the throttling opening of the servo valve (9), and finally realizes the rising slope and the peak value of the waveform by adjusting the simple opening and closing of the reversing valve (10).

5. The operating method of a high-lift-ratio hydraulic hammer wave generator based on the fuzzy control theory as claimed in claim 4, characterized in that the capacity of the oil-filling circuit is not less than the instantaneous oil-filling flow Q of the high-pressure end of the supercharger (11)_HbAnd oil compensation amount delta V_HbThe minimum value of (a) is determined,v is the volume of the tested workpiece, dp/dt is the pressure change rate, and E is the elastic modulus of oil;Δ p represents a pressure difference; the capacity of the accumulator group (5) is not less than the instantaneous oil supply flow Q of the low-pressure end of the supercharger (11)_LbAnd oil compensation amount delta V_LbThe hydraulic pump (1) provides an instantaneous oil supply flow Q not less than the low-pressure end of the supercharger (11)_LbAbility of (C), Q_Lb＝a×Q_HbAnd a is expressed as a pressure increase ratio; Δ V_Lb＝a×ΔV_Hb，ΔV_HbThe oil is supplemented to the high-pressure end of the supercharger (11).

Technical Field

The invention relates to the technical field of hydraulic element performance tests, in particular to a high-lift-rate water hammer generator based on a fuzzy control theory and a working method thereof.

Background

With the rapid development of the industry in China, the hydraulic system is widely applied in various fields. The hydraulic impact can seriously threaten the reliability of a hydraulic pipeline system, the threat cannot be eliminated, the problem is considered when the pipeline and a hydraulic element are designed, along with the rapid, healthy and stable development of the mechanical industry in China, the requirement on the service life of a product is stricter and stricter, the quality requirement on pipelines used in various equipment hydraulic systems is improved, wherein the compression resistance and the impact resistance of the pipelines and accessories of the hydraulic system become important performance indexes, and professional, high-pressure and high-performance pressure pulse detection equipment is more and more important.

When the liquid velocity in the hydraulic system line abruptly changes due to some reason, the liquid pressure in the line abruptly changes, and high-frequency hydraulic oscillation occurs, and when hydraulic shock occurs, the hydraulic line and accessories are damaged. The hydraulic impact can seriously threaten the reliability of a hydraulic pipeline system and elements, so that the performance of the elements and the pipelines under the action of long-time high-voltage pulses must be considered during the design of the pipelines and the hydraulic elements; a continuous water hammer impact vibration generator, a water tank, a hydraulic piston vibrator and a pipeline are disclosed in the patent application number of '201210431367. x' and the patent name of 'a continuous water hammer impact vibration method', and continuous 'water hammer-like' shock waves are generated in the pipeline connected with the second diversion hole by ceaselessly rotating the mandrel; according to the technical scheme, the purpose of energy saving is achieved by adopting pure water as a working medium through water hammer shock waves, but in the existing pressure pulse test equipment in a hydraulic system pipeline, the pressure rising rate is slow, the pressure rising rate cannot be regulated and controlled, and the test effect is poor.

Disclosure of Invention

The invention provides a high-lift-rate water hammer generator based on a fuzzy control theory and a working method thereof, and aims to solve the technical problems that in the existing device for testing the performance of elements in a hydraulic system pipeline, the pressure rising rate is slow, the pressure rising rate cannot be regulated and controlled, and the testing effect is poor.

In order to solve the above problems, the technical solution of the present invention is realized as follows:

a high-lift-rate water hammer generator based on a fuzzy control theory comprises a hydraulic pump, wherein the hydraulic pump is communicated with a hydraulic pulse generating device through a filter and a first one-way valve in sequence, an energy storage device is arranged between the first one-way valve and the hydraulic pulse generating device, the hydraulic pulse generating device is communicated with a supercharger, and the supercharger is communicated with an oil supplementing pipeline through a second one-way valve; the hydraulic pulse generating device is connected with an upper computer.

Preferably, the hydraulic pulse generating device comprises a servo valve, a bypass valve and a reversing valve, the hydraulic pump is respectively communicated with oil inlets of the bypass valve and the servo valve sequentially through a filter and a first one-way valve, oil outlets of the bypass valve and the servo valve are respectively communicated with an oil inlet of the reversing valve, an oil outlet of the reversing valve is communicated with a supercharger, an oil return port of the servo valve and an oil return port of the reversing valve are respectively communicated with an oil return pipeline, the oil return pipeline is respectively communicated with an overflow valve and an oil source through the oil return valve, and the overflow valve is respectively communicated with the filter and the first one-way valve; the bypass valve, the servo valve and the reversing valve are all connected with an upper computer; and an energy storage device is arranged between the first one-way valve and the bypass valve as well as between the first one-way valve and the servo valve.

Preferably, the energy storage device comprises an energy storage group, a pressure gauge is arranged on one side of the energy storage group, the energy storage group is respectively communicated with the bypass valve, an oil inlet of the servo valve, the oil drain valve and the first one-way valve, and the oil drain valve is respectively communicated with the first one-way valve, the bypass valve and an oil inlet of the servo valve.

The working method of the high-lift-rate water hammer wave generator based on the fuzzy control theory comprises the following steps

S1, firstly, hydraulic oil is introduced through a hydraulic pump and is sent to a hydraulic pulse generating device through a filter and a first one-way valve in sequence, the hydraulic pulse generating device sends the hydraulic oil to a supercharger, a supercharger piston acts to send the hydraulic oil to a tested workpiece, and oil is supplemented into the supercharger through an oil supplementing pipeline in the test process;

s2, storing the hydraulic energy into an accumulator group by an oil source in a working pressure stabilizing section and a back pressure section of the pulse curve; in the ascending section, the accumulator group releases the stored hydraulic energy to the hydraulic pulse generating device to enable the hydraulic pulse generating device to generate a required ascending slope and a peak value, and meanwhile, the upper computer controls the ascending slope and the peak value of the waveform by controlling the sizes of the throttling openings of the bypass valve, the servo valve and the reversing valve in the hydraulic pulse generating device;

s3, according to the step S2, when the pressure rising rate required by the test is not high and the flow control of the servo valve can meet the requirements of the rising slope and the peak value of the test, controlling the reversing valve to be in the left position through the upper computer to enable the pipeline to be in a communicated state, and then adjusting the size of the throttling opening of the servo valve through the upper computer to control the rising slope and the peak value of the waveform;

s4, according to the step S2, when the pressure rising rate required by the test is high and the flow control of the servo valve cannot meet the requirements of the rising slope and the peak value, the upper computer controls the bypass valve to open and close the servo valve, then controls the reversing valve to act, observes the conditions of the pressure rising rate and the peak value, repeatedly adjusts the size of the throttling opening of the servo valve until the flow of the servo valve meets the requirements of the test rising slope and the peak value, fixes the size of the throttling opening of the servo valve, and finally realizes the rising slope and the peak value of the waveform by adjusting the simple opening and closing of the reversing valve.

Preferably, the capacity of the oil supplementing circuit is not less than the instantaneous oil supplementing flow Q of the high-pressure end of the supercharger_HbAnd oil compensation amount delta V_HbMinimum value of (d);v is the volume of the tested workpiece, dp/dt is the pressure change rate, and E is the elastic modulus of oil;Δ p represents a pressure difference; the capacity of the accumulator group is not less than the instantaneous oil supply flow Q of the low-pressure end of the supercharger_LbAnd oil compensation amount delta V_LbThe hydraulic pump provides an instantaneous oil supply flow Q which is not less than the low-pressure end of the supercharger_LbAbility of (C), Q_Lb＝a×Q_HbAnd a is expressed as a pressure increase ratio; Δ V_Lb＝a×ΔV_Hb，ΔV_HbThe oil is supplemented at the high-pressure end of the supercharger.

Compared with the prior art, the invention has the beneficial effects that:

the invention utilizes the accumulator to combine the hydraulic pulse generating device to integrally realize the effects of high pressure rising rate and controllable and adjustable pressure rising rate, realizes the pressure fatigue life test of the hydraulic element by adjusting the pressure rising rate, and provides important data support for the process improvement, design and research and development of important hydraulic elements.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

In the figure, 1 is a hydraulic pump, 2 is a filter, 3 is an overflow valve, 4 is a first check valve, 5 is an accumulator group, 6 is an oil drain valve, 7 is a pressure gauge, 8 is a bypass valve, 9 is a servo valve, 10 is a reversing valve, 11 is a supercharger, and 12 is a second check valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1: as shown in fig. 1, a high-lift-rate water hammer generator based on a fuzzy control theory comprises a hydraulic pump 1, wherein a medium introduced by an oil source enters the hydraulic pump 1 from a connector a and then enters a hydraulic pulse generating device, the hydraulic pump 1 is communicated with the hydraulic pulse generating device through a filter 2 and a first one-way valve 4 in sequence, the first one-way valve aims at preventing pressure waves from being reflected back to the oil source, an energy storage device is arranged between the first one-way valve 4 and the hydraulic pulse generating device and is used for supplementing required instantaneous large flow during pulse generation, the hydraulic pulse generating device is communicated with a supercharger 11, and the supercharger 11 is communicated with an oil supplementing pipeline through a second one-way valve 12; the hydraulic pulse generating device is connected with an upper computer.

The hydraulic pulse generating device comprises a servo valve 9, a bypass valve 8 and a reversing valve 10, a hydraulic pump 1 is respectively communicated with oil inlets of the bypass valve 8 and the servo valve 9 sequentially through a filter 2 and a first one-way valve 4, oil outlets of the bypass valve 8 and the servo valve 9 are respectively communicated with an oil inlet of the reversing valve 10, an oil outlet of the reversing valve 10 is communicated with a supercharger 11, an oil return port of the servo valve 9 and an oil return port of the reversing valve 10 are respectively communicated with an oil return pipeline, the oil return pipeline is respectively communicated with an overflow valve 3 and an oil source through an oil return valve 13, and the overflow valve 3 is respectively communicated with the filter 2 and the first one-way valve 4; the bypass valve 8, the servo valve 9 and the reversing valve 10 are all connected with an upper computer; and an energy storage device is arranged between the first one-way valve 4 and the bypass valve 8 and between the first one-way valve and the servo valve 9.

The energy storage device comprises an energy storage group 5, a pressure gauge 7 is arranged on one side of the energy storage group 5, the energy storage group 5 is respectively communicated with a bypass valve 8, an oil inlet of a servo valve 9, an oil drain valve 6 and a first one-way valve 4, and the oil drain valve 6 is respectively communicated with the first one-way valve 4, the bypass valve 8 and an oil inlet of the servo valve 9.

Example 2: as shown in FIG. 1, the working method of the high-lift-rate water hammer wave generator based on the fuzzy control theory

The method comprises the following steps:

s1, firstly, hydraulic oil is introduced through a hydraulic pump 1 and sequentially sent to a hydraulic pulse generating device through a filter 2 and a first one-way valve 4, the hydraulic pulse generating device sends the hydraulic oil to a supercharger 11, a piston of the supercharger 11 acts to send the hydraulic oil to a tested workpiece, and oil is supplemented into the supercharger 11 through an oil supplementing pipeline in the test process;

s2, in the working pressure stabilizing section and the back pressure section of the pulse curve, the oil source stores the hydraulic energy into the accumulator group 5; in the ascending section, the accumulator group 5 releases the stored hydraulic energy to the hydraulic pulse generating device to enable the hydraulic pulse generating device to generate a required ascending slope and a peak value, and meanwhile, the upper computer controls the ascending slope and the peak value of a waveform by controlling the size of throttling openings of a bypass valve 8, a servo valve 9 and a reversing valve 10 in the hydraulic pulse generating device;

the capacity of the oil supplementing loop is not less than the instantaneous oil supplementing flow Q of the high-pressure end of the supercharger 11_HbAnd oil compensation amount delta V_HbMinimum value of (d);v is the volume of the tested workpiece, dp/dt is the pressure change rate, and E is the elastic modulus of oil;Δ p represents a pressure difference; the capacity of the accumulator group 5 is not less than the instantaneous oil supply flow Q at the low-pressure end of the supercharger 11_LbAnd oil compensation amount delta V_LbThe hydraulic pump 1 supplies an instantaneous oil supply flow rate Q of not less than the low-pressure side of the supercharger 11_LbAbility of (C), Q_Lb＝a×Q_HbAnd a is expressed as a pressure increase ratio; Δ V_Lb＝a×ΔV_Hb，ΔV_HbThe oil supplement amount is expressed as the high-pressure end oil supplement amount of the supercharger 11;

s3, according to the step S2, when the pressure rising rate required by the test is not high and the flow control of the servo valve can meet the requirements of the rising slope and the peak value of the test, controlling the reversing valve 10 to be in the left position by the upper computer to enable the pipeline to be in a communicated state, and then adjusting the size of the throttling opening of the servo valve 9 by the upper computer to control the rising slope and the peak value of the waveform;

s4, according to the step S2, when the pressure rising rate required by the test is high and the flow control of the servo valve 9 can not meet the requirements of the rising slope and the peak value, the upper computer controls the bypass valve 8 to open, the servo valve 9 to close, then controls the reversing valve 10 to act, observes the conditions of the pressure rising rate and the peak value, repeatedly adjusts the size of the throttling opening of the servo valve 9 until the flow of the servo valve 9 meets the requirements of the test rising slope and the peak value, fixes the size of the throttling opening of the servo valve 9, and finally realizes the rising slope and the peak value of the waveform by adjusting the simple opening and closing of the reversing valve 10.