Recursive Hexapod System and Method for Multiaxial Mechanical Testing
First Claim
1. A materials testing machine for six degrees of freedom multiaxial testing of specimens held between a fixed base and a movable base, the machine comprising:
- a fixed base;
a movable base, the movable base being connected to the fixed base by a hexapod arrangement of six linearly extendable actuator linkages, a first end of each actuator linkage being attached to the movable base, a second end of each actuator linkage being attached to the fixed base;
each of the actuator linkages including a hydraulic cylinder and piston, a digitally controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, and a linear displacement transducer for measuring an extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston,wherein in operation, operation of each of the servo-valves extends each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen.
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Accused Products
Abstract
A recursive hexapod testing machine for mechanical testing of deformable material specimens under six degrees of freedom multiaxial loading. The machine includes a fixed base, a movable base connected to the fixed base at by a hexapod arrangement of six linearly extendable actuator linkages, with an end of each linkages attached to the movable base and the other end of the linkage attached to the fixed base. Each actuator linkage includes a hydraulic cylinder and piston, a digitally-controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, a linear variable displacement transducer for measuring extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston. The servo-valves extend each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen.
10 Citations
13 Claims
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1. A materials testing machine for six degrees of freedom multiaxial testing of specimens held between a fixed base and a movable base, the machine comprising:
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a fixed base; a movable base, the movable base being connected to the fixed base by a hexapod arrangement of six linearly extendable actuator linkages, a first end of each actuator linkage being attached to the movable base, a second end of each actuator linkage being attached to the fixed base; each of the actuator linkages including a hydraulic cylinder and piston, a digitally controlled electro-hydraulic servo-valve for actuating the hydraulic cylinder in response to a digital command string, a load cell in line between the piston and the universal joint attached to the movable base, and a linear displacement transducer for measuring an extension of the piston, and a magneto-resistive position transducer for measuring a position of the piston, wherein in operation, operation of each of the servo-valves extends each hydraulic cylinder a predetermined amount to effect a desired motion of the material specimen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification