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本文的主要目的是要明确, 在设计低速风洞机械式天平时的几个主要设计指标的考虑方法。文章讨论了: (1)稳定度和灵敏度, 以及天平传力机构的刚度对它们的影响, 决定天平刚度设计指标的主要依据, 天平干扰误差的主要来源; (2)利用平稳随机过程理论, 研究了天平杆的摆动幅度。理论与实验均证明了, 当风洞气流的湍度特性一定时, 天平称杆端点的摆幅主要取决于系统的静稳定度和阻尼系数, 并与静稳定度和阻尼系数的乘积平方根成正比。在一般的机械式天平的自振频率范围内, 改变系统的自振频率, 对减小摆幅的影响不大。
The main purpose of this paper is to identify several key design considerations in the design of low-speed wind tunnel mechanical balances. The article discusses: (1) Stability and sensitivity, and the influence of the balance transmission force on them, the main basis for determining the balance stiffness design index, the main source of balance interference error; (2) Using the theory of stationary stochastic process, The balance of the swing lever. Both theory and experiment prove that when the turbulent characteristic of airflow in a wind tunnel is certain, the balance of the balance is called the static stability and the damping coefficient of the system and proportional to the square root of the product of static stability and damping coefficient . In the general mechanical balance natural frequency range, changing the natural frequency of the system, to reduce the swing is not affected.