The relationship between <i>A</i>_<i>w</i> and human feelings.

During the field operation of rice combine harvester, the vibration generated by vibration component will only reduce mechanical reliability and yield, but also cause resonance in the human body, leading to a decrease in driving comfort and even damage to the driver’s health. To study the impact of combine harvester vibration on driving comfort, a certain type of tracked rice combine harvester was selected as the research object, and vibration tests were carried out based on vibration source analysis in the driving cab during field harvesting operations. The study showed that under the influence of field road conditions and crop flow, the operating speed of the engine, threshing rotor, stirrer, cutting blade, threshing cylinder, vibration sieve and conveyor were fluctuating, and their rotation and reciprocating motion would produce vibration excitation in the driving cab. A spectrum analysis was conducted on the acceleration signal of the driver’s cab, and it was found that vibration frequencies at three measuring points, namely the pedal, control lever, and seat, can reach up to 36.7~43.3 Hz. These frequencies can cause resonance in various parts of the driver’s body, such as the head and lower limbs, leading to symptoms such as dizziness, throat discomfort, leg pain, defecation anxiety, and frequent urination, and even affect vision of the driver. At the same time, a weighted root-mean-square acceleration evaluation method was used to evaluate the driving comfort of the harvester. The evaluation method showed that the vibration at the foot pedal (Aw1 = 4.4 m/s2>2.5 m/s2) caused extreme discomfort, while the vibration at the seat (0.5 m/s2< Aw2 = 0.67 m/s2<1.0 m/s2) and the control lever (0.5 m/s2< Aw3 = 0.55 m/s2<1.0 m/s2) caused relatively less discomfort. This research can provide some reference for the optimization design of the joint harvester driver’s cab.在水稻联合收割机（rice combine harvester）田间作业过程中，振动部件（vibration component）产生的振动不仅会降低机械可靠性与作业产量，还会引发人体共振，导致驾驶舒适性下降，甚至损害驾驶员身体健康。为研究联合收割机（combine harvester）振动对驾驶舒适性的影响，本研究以某型号履带式水稻联合收割机（tracked rice combine harvester）为研究对象，在田间收割作业过程中，基于驾驶室（driver's cab）振动源分析开展了振动测试。研究表明，受田间路况与作物喂入量的影响，发动机（engine）、脱粒转子（threshing rotor）、搅龙（stirrer）、切割刀片（cutting blade）、脱粒滚筒（threshing cylinder）、振动筛（vibration sieve）以及输送装置（conveyor）的作业转速均存在波动，其旋转与往复运动将在驾驶室内部产生振动激励（vibration excitation）。对驾驶室加速度信号（acceleration signal）进行频谱分析（spectrum analysis）后发现，踏板、操纵杆与座椅三个测点（measuring points）的振动频率最高可达36.7~43.3 Hz。该频率范围可引发驾驶员头部、下肢（lower limbs）等身体多个部位产生共振，进而导致头晕、咽喉不适、腿部疼痛、排便焦虑与尿频等症状，甚至影响驾驶员视力。同时，本研究采用加权均方根加速度（weighted root-mean-square acceleration）评价法对收割机驾驶舒适性进行评估。评估结果显示，脚踏板（foot pedal）处的振动（Aw₁=4.4 m/s²>2.5 m/s²）会引发极强不适感，而座椅（0.5 m/s²<Aw₂=0.67 m/s²<1.0 m/s²）与操纵杆（0.5 m/s²<Aw₃=0.55 m/s²<1.0 m/s²）处的振动带来的不适感相对较轻。本研究可为联合收割机驾驶室的优化设计提供参考依据。