School of Mechanical Engineering, Tongji University, Shanghai, China.
Indoor Air. 2022 Jan;32(1):e12915. doi: 10.1111/ina.12915. Epub 2021 Aug 1.
Public transports like the bus and subway inherently experience noise, vibration, and temperature variations that are different from building environment. Each of them can influence passengers' comfort, but little is known about their combined effects, especially how they affect thermal comfort. This paper presents experimental results from a series of human subject tests under different noises, vibrations, and temperatures. 32 subjects' subjective perception and physiological response were collected under three temperatures (22.5, 25.5, 28.5℃), five noise levels (55, 60, 65, 70, 75 dB(A)), and five vibrating accelerations (0, 0.2, 0.4, 0.6, 0.8 m/s ). We also varied the noise and vibration spectrums to simulate the bus and subway environments. In total, 48 195-min and 192 115-min laboratory tests were conducted. By using significance tests (paired t tests and two-way ANOVA tests) and sensitivity analysis (Treed Gaussian Process), the results show that temperature, noise, and vibration exposures can significantly affect subjects' overall satisfaction. More interestingly, high noise and vibration levels can cause warmer thermal sensations. A change in the noise of 20 dB(A) or vibration of 0.6 m/s is equivalent to an ambient temperature change of 0.6 °C. We also observed higher heart rates and metabolic heat production at higher levels of noise and vibrating accelerators. Based on the test results, regression models were developed to describe the combined effects of temperature, noise, and vibration on subjects' overall comfort perception and thermal neutral temperature. They can serve as references for the design and operation of public transport environments.
公共交通工具（如公共汽车和地铁）固有地经历着不同于建筑环境的噪声、振动和温度变化。它们各自都会影响乘客的舒适度，但对于它们的综合影响，尤其是它们如何影响热舒适度，人们知之甚少。本文介绍了一系列不同噪声、振动和温度下人体测试的实验结果。在三个温度（22.5、25.5、28.5℃）、五个噪声水平（55、60、65、70、75dB(A)) 和五个振动加速度（0、0.2、0.4、0.6、0.8m/s）下，收集了 32 名受试者的主观感知和生理反应。我们还改变了噪声和振动频谱，以模拟公共汽车和地铁环境。总共进行了 48 次 195 分钟和 192 次 115 分钟的实验室测试。通过使用显著性检验（配对 t 检验和双向方差分析检验）和敏感性分析（树状高斯过程），结果表明，温度、噪声和振动暴露会显著影响受试者的整体满意度。更有趣的是，高噪声和振动水平会导致更温暖的热感觉。噪声增加 20dB(A) 或振动增加 0.6m/s 相当于环境温度变化 0.6°C。我们还观察到在更高的噪声和振动加速度水平下，心率和代谢产热量更高。基于测试结果，建立了回归模型来描述温度、噪声和振动对受试者整体舒适度感知和热中性温度的综合影响。它们可以作为公共交通环境设计和运营的参考。
