Sweating Simulator with Zoned Skin-Temperature Moisture Testing
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Solution Overview
Problem
Existing methods for evaluating liquid moisture management properties of fabrics fail to accurately simulate real-time sweating conditions, particularly in terms of spatial and temporal distribution, leading to inaccurate assessments of comfort and performance characteristics.
Innovation Solution
A sweating simulator device that replicates high-intensity sweating zones with adjustable slope and temperature control, allowing for precise measurement of sweat permeation, distribution, evaporation, and dripping, and capable of simulating various sweating intensities and body postures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard test methods (AATCC, BS) are used to measure fabric moisture management, then basic absorbency and wicking properties can be obtained, but real-time sweating conditions and spatial distribution cannot be simulated
Solution Approach 1:
The sweating simulator divides the sweating surface into multiple independent zones (e.g., 9 zones arranged in 3 rows and 3 columns), each equipped with separate nozzles and control. This segmentation allows independent control of sweating rate in each zone, enabling simulation of spatially varying sweat distribution patterns that match different body regions, thereby resolving the contradiction between measurement precision and adaptability to real sweating conditions.
Solution Approach 2:
The sweating simulator employs dynamic control of sweat delivery through programmable nozzles that can adjust sweating rates in real-time. The system can simulate transient sweating patterns, regional variations, and different intensity levels dynamically, allowing accurate reproduction of real sweating conditions while maintaining precise measurement capabilities through controlled variability.
2Quantity of substance
If artificial microfluidic device is used to replicate perspiration, then sweating rate of 0.75 Lh−1 m−2 can be achieved, but small size and whole surface sweating limit evaluation of fabric moisture management properties
Solution Approach 1:
The sweating simulator transitions from the micro-scale whole-surface approach to a macro-scale segmented approach by distributing multiple controlled nozzles across a larger testing surface. This dimensional expansion allows simulation of high sweating rates over extended fabric areas, enabling comprehensive evaluation of fabric moisture management properties across different spatial scales and configurations.
Solution Approach 2:
Instead of uniform whole-surface sweating, the simulator applies local quality by enabling different sweating rates in different zones. Each nozzle can be independently controlled to deliver sweat at specific rates to specific fabric regions, allowing evaluation of how fabrics handle localized high-moisture zones while maintaining overall high sweating rate capability.
3Adaptability or versatility
If sweating simulator with multiple nozzles and zones is used, then spatial and temporal distribution of sweat can be simulated, but device complexity increases
Solution Approach 1:
The sweating simulator achieves versatility through multi-functionality: the same segmented nozzle system can simulate various sweating patterns (resting, exercise, regional variations), different sweating rates, and multiple test configurations. This universal design allows one complex device to replace multiple simpler devices, justifying the increased complexity by providing comprehensive simulation capabilities in a single integrated system.
Solution Approach 2:
The system manages complexity through parameterization: instead of physically reconfiguring the device for different tests, operators adjust control parameters (sweating rates, zone activation, timing patterns) to simulate different conditions. This parameter-based control approach maintains adaptability while reducing operational complexity compared to physical reconfiguration.
4Measurement precision
If constant height water level is maintained underneath test specimen, then initial absorption and surface evaporation can be measured, but real-time wearing posture and regional sweating cannot be emulated
Solution Approach 1:
The sweating simulator replaces static constant-height water levels with dynamic controlled delivery through individually addressable nozzles. This dynamic system can adjust sweat delivery in real-time to match changing wearing postures and regional sweating patterns, while maintaining precise measurement capabilities through controlled variability rather than static equilibrium.
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
Provides accurate and reproducible measurements of liquid moisture management properties, including sweat absorption, spreading, evaporation, and drying, under realistic conditions, applicable to a wide range of fabric types and constructions.
Implementation Method 1
the temperature control panel includes a temperature sensor and a heating element to control a temperature of the temperature control panel around 33-35° C., for example, so as to simulate a temperature of a surface of the human skin
Implementation Method 2
an upper middle position of the temperature control panel includes a sweating zone, the sweating zone comprises a plurality of sweating pores
Implementation Method 3
Provides accurate and reproducible measurements of liquid moisture management properties, including sweat absorption, spreading, evaporation, and drying
Implementation Method 4
Provides accurate and reproducible measurements of liquid moisture management properties, including sweat absorption, spreading, evaporation, and drying
Data Source
AI summary
A sweating simulator has a foundation panel (14), a panel (1) and a temperature control panel (2), a fixture for fixing a specimen, a container (7) for holding simulated sweat, a container (15) for collecting the simulated sweat, and a plurality of weighing scales for measuring masses of the simulated sweat supplied, evaporated and dripped from the specimen, respectively. The panel (1) and temperature control panel (2) constitute a simulated sweating plane for simulating wetting properties and temperature of skin. An upper middle position of the temperature control panel (2) has a sweating zone (3), which has a plurality of sweating pores (4). The temperature control panel (2) has a temperature sensor (8) and a heating element to control the temperature of the temperature control panel (2) around 33-35° C. to simulate the temperature of the human skin surface. The sweating rate of the sweating zone (3) is in the range of about 1 to 624 ml/h or about 0.004 to 2.5 L/h-m2 to simulate various sweating intensities.