Principle:ARISE Initiative Robosuite Gripper Testing
| Knowledge Sources | |
|---|---|
| Domains | Robotics, Testing, Simulation |
| Last Updated | 2026-02-15 07:00 GMT |
Overview
An automated testing harness that validates gripper behavior by constructing a minimal simulation scene with a table, test object, and controllable gripper, then executing scripted open/close/grasp sequences to verify physical properties.
Description
When developing gripper models for simulation, it is essential to verify that the gripper behaves correctly before integrating it into full task environments. Key properties to validate include the ability to open and close fully, the capacity to grasp and lift objects of specified size and density, the stability of the grasp under gravity, and the absence of unintended collisions or penetrations. Manual testing of each gripper in a full environment is slow and error-prone, so an automated testing harness is needed.
A gripper testing harness constructs a minimal but complete simulation scene: a table provides a surface, a test object (typically a box with configurable size and density) is placed on the table, and the gripper under test is mounted on a vertical slide joint above the object. The slide joint allows the gripper to be moved up and down programmatically, simulating the approach and retract phases of a grasp. Actuators for both the gripper fingers and the vertical slide are configured, and the simulation is stepped through a scripted sequence.
The test sequence typically proceeds through phases: lower the gripper to the object, close the fingers, raise the gripper, and check whether the object was successfully lifted. The harness can measure grasp success, finger contact forces, object displacement, and stability metrics. By parameterizing the test object properties and gripper configuration, the same harness can validate any gripper model against standardized benchmarks.
Usage
Use this principle whenever a new gripper model is added to the simulation framework. Run the gripper tester with various object sizes and densities to confirm that the gripper can reliably grasp, hold, and release objects. The tester is also useful for regression testing after modifying gripper XML parameters or actuator settings.
Theoretical Basis
The testing harness follows a scripted simulation pattern:
Scene Construction:
1. Create world base
2. Merge table arena (small table, no legs)
3. Attach gripper to vertical slide joint with position actuator
4. Place test box on table surface
Test Sequence (timed phases):
Phase 1 (0 to T1): Lower gripper to grasp height
Phase 2 (T1 to T2): Close gripper fingers
Phase 3 (T2 to T3): Raise gripper to lift height
Phase 4 (T3 to T4): Hold and verify object position
Vertical slide joint configuration:
joint: type=slide, axis=[0,0,-1], damping=50
actuator: type=position, kp=500
Grasp verification checks whether the object's vertical position has increased above the table surface after the lift phase, confirming a successful grasp. The test parameters are:
gripper_low_pos: target z for grasp approach
gripper_high_pos: target z for lift verification
box_size: [x, y, z] half-extents of test object
box_density: mass density in kg/m^3
step_time: simulation steps per phase