Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
  • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/18—Combined units comprising both motor and pump
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
  • G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/205—Systems with pumps
  • F15B2211/20507—Type of prime mover
  • F15B2211/20515—Electric motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/205—Systems with pumps
  • F15B2211/2053—Type of pump
  • F15B2211/20538—Type of pump constant capacity
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/205—Systems with pumps
  • F15B2211/2053—Type of pump
  • F15B2211/20546—Type of pump variable capacity
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6306—Electronic controllers using input signals representing a pressure
  • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
  • F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
  • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
  • F15B2211/6653—Pressure control
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/76—Control of force or torque of the output member
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/003—Generation of the force
  • G01N2203/0042—Pneumatic or hydraulic means
  • G01N2203/0048—Hydraulic means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/02—Details not specific for a particular testing method
  • G01N2203/0202—Control of the test
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/02—Details not specific for a particular testing method
  • G01N2203/0202—Control of the test
  • G01N2203/0212—Theories, calculations
  • G01N2203/0218—Calculations based on experimental data

Definitions

• the second pressure set point is less than the first pressure set point.
• the method further comprises controlling the fluid displacement of the pump in dependence on the target fluid displacement.
• the electrical inverter is arranged to control the operating point of the electric motor by controlling one or more of the current of the AC electrical supply, the frequency of the AC electrical supply, and the phase of the AC electrical supply such that an operating efficiency of the electric motor is changed to maintain the operating point.
• the motor control signal is indicative of the target pressure.
• the controller is arranged to control a fluid displacement of the pump to maintain the hydraulic fluid at the outlet at the target pressure.
• the pump is arranged to be, in use, submerged within the hydraulic fluid within the reservoir.
• the one or more test variables may comprise any one or more of: a (e.g., linear or rotational) actuation displacement; an actuation force; an actuation torque; a strain induced in the material sample; and a temperature of the material sample (which may e.g., result from self-heating of the material sample).
• a (e.g., linear or rotational) actuation displacement e.g., linear or rotational) actuation displacement
• an actuation force e.g., an actuation force
• an actuation torque e.g., a strain induced in the material sample
• a temperature of the material sample which may e.g., result from self-heating of the material sample.
• the HPU 110 may optionally comprise the motor driver circuitry 122 which may be arranged to provide an electrical supply to the electric motor 112 in accordance with the present technique.
• the HPU 110 may optionally comprise start circuitry (such as, for example, a star delta starter, or any other type of start circuitry) (not shown) arranged to control the electric motor 112 during start up.
• the motor driver circuitry 122 may be arranged to control a rotational speed of the electric motor 112 in accordance with the present technique.
• the said controlling means of the motor driver circuitry 122 may be operable to control the output pressure of the HPU 110 based on both the pressure set point and an indication of a measured output pressure of the HPU 110, the measured output pressure being provided by e.g., a pressure sensor (not shown) or any other type of sensor operable to measure one or more metrics indicative of the output pressure of the HPU 110.
• the said controlling means may be arranged to implement closed-loop control based on feedback comprising the indication of the output pressure of the HPU 110.
• the controller 140 may implement a functionality of the controlling means discussed immediately above.
• controller 140 may implement a functionality of the pressure compensating controlling means discussed above.
• the system 100 may comprise the controller 140, which may be arranged to control the output pressure of the HPU 110 in accordance with the present technique.
• the load determiner 142 may be arranged to: obtain an indication of a test configuration of a material test process to be performed by a material testing apparatus; determine a load demand of the test process based on the received indication of the material test configuration; and provide an indication of a pressure set point to the controller 140 based on the determined load demand.
• the load demand may correspond to, for example, a maximum load demand for the material test process e.g., the highest pressure or e.g., the highest actuation force that that material test process could require to be performed successfully.
• the load demand may be indicative of at least a minimum output pressure of the HPU 110 required for the material test process to be performed successfully.
• the indication of the pressure set point may comprise, for example, a value of the pressure set point, or any other value based thereon or otherwise indicative of the pressure set point, including, for example, an indication of the force demand.
• the communications circuitry 126 may be arranged to receive, for example, an indication of the above-described pump control signal and to provide it to the pump 114. Additionally or alternatively, in some examples, communications circuitry 126 may be arranged to receive the above-described motor control signal from the controller 140 and to provide it to the motor driver circuitry 122.
• motor driver circuitry 122 may comprise controlling means (not shown) operable to receive an indication of a pressure set point (such as, for example, the first or second pressure set point) and to control the output pressure of the HPU 300 based on the pressure set point by controlling the rotational speed of the electric motor 112.
• motor control signal 322 may comprise an indication of the pressure set point, such as the first or second pressure set point, for example.
• the controller 140 may be arranged to directly control the rotational speed of the electric motor 112 to control the output pressure of the HPU 300 based on a pressure set point (such as, for example, the first or second pressure set point).
• the motor control signal 322 may comprise an indication of one or more parameters of the electrical supply and the motor driver circuitry 122 may be arranged to control one or more parameters of the electrical supply in accordance with motor control signal 322.
• the HPU 300 provides for an HPU operable to tailor its output pressure in accordance with a pressure demand of a material test process, thereby enabling an HPU having a reduced power consumption.
• the electric motor 112 may comprise an AC electric motor and the motor driver circuitry 122 may comprise an electrical inverter in accordance with examples disclosed herein.
• the motor driver circuitry 122 comprising the electrical inverter may be arranged to control the operating point of the electric motor 112 by controlling one or more parameters of the (AC) electrical supply 302 such that an operating efficiency of the electric motor 112 is changed to maintain the operating point, in accordance with any example disclosed herein.
• this may enable the HPU 300 to operate yet more efficiently still.
• the controller 140 comprises an input 516 arranged to receive an indication 518 of the pressure set point (e.g., the first pressure set point for performing the first material test process or e.g., the second pressure set point for performing the second material test process).
• the indication 518 may be received, for example, in accordance with any example disclosed herein.
• the pressure sensor 510 may be arranged to provide the indication of the measured output pressure to the motor driver circuitry 122, as indicated by the arrow 530.
• the pressure of the pressurised hydraulic fluid to be provided to the material testing apparatus is controlled based on the second pressure set point.
• the controlling of the pressurised hydraulic fluid based on the second pressure set point may be in accordance with any example disclosed herein.
• an indication of a test configuration of a test process to be performed by a material testing apparatus is obtained, the material testing apparatus arranged to receive a pressurised hydraulic fluid from a hydraulic power unit, HPU.
• the material testing apparatus may correspond to, for example, the material testing apparatus 130 or any other material testing apparatus.
• the hydraulic power unit may comprise, for example, any one of the hydraulic power unit 110, the hydraulic power unit 300, the hydraulic power unit 400, and the hydraulic power unit 500.
• the material test process may correspond to, for example, any material test process including any material test process disclosed herein.
• the indication of the test configuration may be obtained in accordance with any example disclosed herein.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Immunology (AREA)
• Biochemistry (AREA)
• Pathology (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• General Physics & Mathematics (AREA)
• General Health & Medical Sciences (AREA)
• Mechanical Engineering (AREA)
• Fluid Mechanics (AREA)
• General Engineering & Computer Science (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
• Control Of Positive-Displacement Pumps (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

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• 2022
  • 2022-08-02 JP JP2024506724A patent/JP2024530924A/ja active Pending
  • 2022-08-02 WO PCT/US2022/039124 patent/WO2023014684A1/en not_active Ceased
  • 2022-08-02 US US18/293,514 patent/US20240369082A1/en active Pending
  • 2022-08-02 CN CN202280066780.2A patent/CN118056120A/zh active Pending
  • 2022-08-02 EP EP22764482.0A patent/EP4381269A1/en active Pending

Patent Citations (5)

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