Cam-Type Cabin Door Load Simulation for Gravity and Gusts
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Solution Overview
Problem
Existing technologies lack a comprehensive load simulation system for aircraft cabin doors that can accurately simulate gravity, friction, inertia, and gust wind disturbances, failing to meet the simulation needs for aircraft cabin door actuation systems.
Innovation Solution
A cam-type load simulator comprising n cam sets, an input shaft, couplings, and a friction disk, with each cam set including gravity, inertia, and wind load simulators, connected in series to simulate these loads, utilizing adjustable cams and actuators to vary load profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a comprehensive load simulation system is designed to simulate gravity, friction, inertia, and gust wind disturbances, then the simulation accuracy and completeness are improved, but the device complexity and space requirements increase
Solution Approach 1:
The load simulation system is divided into multiple independent cam sets, with each cam set responsible for simulating specific load types (gravity, friction, inertia, wind load). Each cam set includes specific components such as gravity cams with weights, friction disks, inertia cams with weights, and wind load cams with springs and weights. This segmentation allows each module to be optimized independently while working together to provide comprehensive load simulation.
Solution Approach 2:
The input shaft serves as a universal transmission element that connects all cam sets and the friction disk in series, enabling a single rotational motion to simultaneously drive multiple load simulation mechanisms. This multi-functional design allows one input shaft to control the simulation of various load types without requiring separate independent systems for each load.
2Adaptability or versatility
If multiple cam sets are connected in series through the input shaft to simulate various loads, then the simulation completeness is improved, but the space occupied by the device increases
Solution Approach 1:
The cam sets are arranged in a nested configuration where smaller cam mechanisms are positioned within or adjacent to larger ones, allowing multiple load simulation systems to share overlapping spatial resources. The friction disk is positioned at the end of the series connection, with its bracket integrated into the overall structure, maximizing space utilization while maintaining all necessary simulation functions.
3Adaptability or versatility
If adjustable cams and actuators are used to vary load profiles, then the adaptability to different load conditions is improved, but the device complexity increases
Solution Approach 1:
The cam profiles are designed to be adjustable through actuators that can modify the geometry and timing of the cam surfaces. This dynamic adjustment capability allows the same physical cam set to simulate different load profiles and characteristics by changing the cam profile geometry, providing versatility without requiring multiple fixed cam sets for each load type.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively simulates various loads with adjustable parameters, reducing space requirements and enabling precise simulation of complex load conditions, including sudden wind disturbances, while maintaining a compact design.
Implementation Method 1
the gravity weight is connected to an outer circumferential side wall of the gravity cam with a steel wire rope, a corresponding torque is generated by a self-weight of the gravity weight
Implementation Method 2
a friction load is simulated by applying friction resistance on a disk surface of the friction disk
Implementation Method 3
the inertia weight is connected to an outer circumferential side wall of the inertia cam with a steel wire rope, a corresponding torque is generated by a self-weight of the inertia weight
Implementation Method 4
the wind load weight is connected to an outer circumferential side wall of the wind load cam through the spring
Implementation Method 5
the wind load cam drives the wind load weight to simulate a wind load
Data Source
AI summary
The present application discloses a cam type airplane cabin door load simulation device and simulation method. The device comprises n cam groups, an input shaft, 3n couplers, and a friction disc load device; the n cam groups and the friction disc load device are connected in series by means of the input shaft; 3n couplers are provided on the input shaft; each cam group comprises a gravity cam simulation device, an inertia cam simulation device, and a wind load cam simulation device; and in each cam group, the gravity cam simulation device, the inertia cam simulation device, and the wind load cam simulation device are sequentially connected in series by means of the input shaft, and the tail ends of the n cam groups are connected in series with the friction disc load device by means of a coupler.