Abstract: In various examples, scenarios may be defined using a declarative description—e.g., defining a behavior of interest—that the present system may convert into a procedural description for generating one or more instances and/or variations of a scenario for testing an autonomous or semi-autonomous machine in a virtual environment. The system may execute observers or evaluators for testing the performance and accuracy of the machine and may compute coverage of various elements based on the generated virtual scenarios, and may feed the results back to the system to generate additional instances and/or variations where the coverage or accuracy is below a desired level. As a result, the system may include an end-to-end framework for generating scenarios in virtual environments, testing and validating the scenarios themselves, and/or testing and validating the underlying autonomous or semi-autonomous systems of the machine—all based on a declarative description.

Abstract: A wheel test assembly for testing a wheel-and-tire assembly includes a drum operatively mounted to a base for rotation of the drum. The drum includes an inner circumferential surface. A tailstock assembly is slidably coupled to the base for movement in a lateral direction relative to the drum. A support assembly is slidably coupled to the tailstock assembly for movement in a vertical direction for positioning the wheel-and-tire assembly into rolling contact with the inner circumferential surface of the drum. A spindle assembly is pivotally coupled to the support assembly to adjust a camber angle of the wheel-and-tire assembly. The wheel-and-tire assembly is mounted to the spindle assembly for rotation of the wheel-and-tire assembly.

Abstract: A wheel test assembly for testing a wheel-and-tire assembly includes a drum operatively mounted to a base for rotation of the drum. The drum includes an inner circumferential surface. A tailstock assembly is slidably coupled to the base for movement in a lateral direction relative to the drum. A support assembly is slidably coupled to the tailstock assembly for movement in a vertical direction for positioning the wheel-and-tire assembly into rolling contact with the inner circumferential surface of the drum. A spindle assembly is pivotally coupled to the support assembly to adjust a camber angle of the wheel-and-tire assembly. The wheel-and-tire assembly is mounted to the spindle assembly for rotation of the wheel-and-tire assembly.

Abstract: A restrictor valve functions as an outlet valve in a metered liquid dispensing system and utilizes a spring biased, shiftable anti-siphon check valve to prevent fluid flow back from the receiving tank into the system. The restrictor valve is attached to the delivery end of the system discharge hose. The dispensing system is controlled by a central electronic unit and the restrictor valve includes a sensing unit for signalling the electronic control when liquid is present at the outlet. The restrictor valve is connected to the receiving tank by a low spill coupling to minimize escape of the liquid into the environment. The restrictor valve may also include a vacuum breaker valve which admits air into the discharge hose when the system pump is run in reverse to remove the prime from the discharge hose.