Active Crash Dummy Arm With Motorized Elbow Joints
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Solution Overview
Problem
Existing crash test dummies lack active degree of freedom in their arms, resulting in postures during crashes that do not accurately simulate human actions, affecting the reliability of vehicle passenger protection system tests.
Innovation Solution
An arm for a crash dummy with active functions, including motors, pulleys, and a control method that allows for precise simulation of human arm extension and flexion postures by determining target rotation angles based on vehicle crash information, enabling accurate reflection of human actions during crashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arm of the crash dummy is designed without active degree of freedom, then the structure is simple and easy to manufacture, but the arm posture during crash does not accurately simulate human actions
Solution Approach 1:
The patent applies the dynamics principle by transforming the static arm structure into an active, dynamic system. Motors are integrated into the arm joints to enable real-time adjustment of arm posture, allowing the crash dummy to actively simulate human arm movements during crashes rather than relying on passive, fixed positioning.
Solution Approach 2:
The patent replaces traditional passive mechanical arm structures with an active control system. Instead of relying solely on mechanical constraints and inertial properties, the invention uses motorized actuators and control algorithms to achieve realistic arm postures, substituting simple mechanical design with electromechanical integration.
2Productivity
If the arm of the crash dummy is designed with active degree of freedom to simulate human postures, then the test effectiveness is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the arm into multiple independent segments (upper arm, forearm, hand) with separate motorized joints. This modular approach allows each segment to be controlled independently, improving test effectiveness while enabling standardized manufacturing of individual components that can be assembled systematically.
Solution Approach 2:
The patent implements universality by designing the arm structure to perform multiple functions: it can simulate various human arm postures, withstand crash forces, and provide measurable data. The same motorized joint structure serves both positioning and sensing functions, reducing the need for separate components and simplifying manufacturing.
3Measurement precision
If motors and control systems are added to the arm, then the arm can accurately imitate human extension and flexion postures, but the weight and complexity of the arm increase
Solution Approach 1:
The patent applies local quality by concentrating motorized actuators only at the critical joints (shoulder and elbow) where posture control is most needed, rather than distributing weight uniformly throughout the arm. This localized approach achieves precise posture simulation while minimizing overall arm weight.
Solution Approach 2:
The patent uses parameter changes by selecting motors with optimized torque-to-weight ratios and adjusting motor sizing based on the specific crash test requirements. The control system dynamically adjusts motor activation and force output, using minimal power when precise positioning is needed and leveraging passive dynamics when full active control is not required.
Data Source
AI summary
The present invention relates to the field of vehicle safety crash test dummies, and discloses an arm for a crash dummy, a control method, a device and a storage medium. The arm comprises: a first motor (1), a coupling (2), a capstan shaft (3), a first bevel gear (4), a second motor (5), a first capstan (6), a capstan bearing (7), an elbow joint base (8), a forearm (9), a first elbow joint bearing (11), drive lines (13), a second pulley (14), an elbow joint shaft (16), a first fixed sleeve (17), a second fixed sleeve (18), a second elbow joint bearing (20), an elbow joint connection block (22), a power source connection block (24), a second bevel gear (27), two sets of pulleys, a second capstan (28) and a power source bracket (29). The arm provided in this embodiment has an active function.