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- Also two important energy forms of thermoacoustic system: acoustic power and total power are discussed in details. 在此基础上,阐述了热声系统中两种重要的能量形式:声功和总能流,得到了它们的可用公式。
- In this paper,a method for measuring acoustic power of plane piston transducer based on calorimetry is presented. 介绍了一种基于量热法的平面换能器声功率测量的方法。
- A maximum acoustic power 43.1 W output to RC load of 110 cm~3 capacitance was measured with helium filling of 2.1 MPa and heating power of 2 000 W. 以氦气为工质;在充气压力2.;1 MPa、加热功率2 000 W的条件下;采用110 cm3的气库;在1台驻波型热声发动机上获得了最大43
- A thermoacoustic engine converts thermal energy into acoustic power by thermoacoustic effect without any mechanical moving parts. 热声发动机利用热声效应把热能转化为声功,系统中不存在任何机械运动部件。
- Acoustic power and ultrasonic frequency are both important factors of the degradation of paper mill wastewater ultrasound. 声功率及声频率对造纸黑液的超声降解均有影响。 (5) 超声时向溶液中通入不同溶解气体均能提高超声辐射的效果。
- However, the highest transfer efficiency and largest acoustic power cannot be obtained simultaneously, therefore a trade-off condition must be adopted. 然而系统效率与输出声功率不能同时达到最大值,因此在实际应用中只能采取折中的效果。
- There are three calculation methods of the acoustic power radiated by an electrical machine, which were presented by Jordan, Alger and Yang. 电机电磁噪声的辐射声功率的计算目前广泛采用Alger、Jordan、Yang等人分别提出的三种方法。
- A microphone is a device for converting acoustic power into electric power that has essentially similar wave characteristics. 麦克风是一种装置,其声功率转换成电力,它基本上类似波的特点。
- In this article, a method to optimize not only the directivity but also the acoustic power of loudspeaker arrays is developed. 摘要提出了同时优化扬声器阵列的指向性和声功率级的方法。
- In consideration of the directivity and acoustic power, the input voltage distribution of a loudspeaker array can be optimized and selected. 运用该方法可以优化扬声器阵列的输入电压分布,获得指向性和声功率级二者兼顾的扬声器阵列。
- The acoustic pressure and acoustic power of the whole structure are obtained by superposing those of each infinitesimal element. 以每个微元为一单位,分别计算声压和声功率之后叠加起来,即得整个结构的声辐射。
- Objective To investigate the influences of transducer frequency and acoustic power (AP) on the measurements of the magnitude of cyclic variation of integrated backscatter (CVIB). 目的 观察超声背向散射积分心动周期变化幅度 (CVIB)测值与探头频率及发射声波能量 (AP)的关系。
- Lead alloys as solder for transducers used in high-powered (designated to operate for several hours at acoustic power levels of 125 dB SPL and above) loudspeakers. 用作大功率扬声器(用在长时间操作125分贝以上的音响系统)的传感器焊料中的铅合金。
- Lead alloys as solder for transducers used in high-powered (designated to operate for seeral hours at acoustic power leels of 125 dB SPL and aboe) loudspeakers. 用作高性能(长时间在125分贝或以上)扬声器的传感器中焊料的铅合金;
- It was experimentally proved for the first time that the maximum acoustic power output can be transferred to the load when the acoustic resistance of RC load equals to its acoustic capacitance impedance. 首次通过实验验证了当声阻与容抗相等时,热声发动机向阻容负载传递的声功率最大。
- The king was shorn of his power by his nobles. 国王被手下的贵族们剥夺了权力。
- Numerical simulations were performed and results show that significant attenuation of radiated acoustic power can be obtained, and sound radiation cancellation performance becomes better in low and medium frequencies. 进行了数值仿真,仿真结果表明,应用压电片能有效地抑制声呐设备中障板声辐射,抑制中低频的声辐射效果更好。
- The control object is the total acoustic power level of net power flow input to the main system in whole excitation frequency band. An optimum design method of Multiple Dynamic Vibra - tion Absorbers(MDVA)is studied. 本文以简支薄板为主振系统,对其附加复式动力吸振器,提出以输入系统的净功率流在整个激励频带内的总声功率级为控制量的优化设计方法。
- Based on measurement of acoustic power in liquids an intensity evaluation method for ultrasonic fields is proposed to satisfy practical needs in evaluating ultrasonic cleaning equipment, and controlling ultrasonic intensity. 为解决超声清洗中超声设备性能的评价,以及工程应用中超声强度的选取和控制问题,提出了一种根据声功率大小来测定声场强度的评价方法。
- Based on the acoustic radi-ation modes and the acoustic field distribution modes, the formula for determining the acoustic power radiated from any vibrating surface is derived. The modal analysis in the acoustic radiation problems is enriched. 基于声辐射模态和声场分布模态;推导了计算任意形状振动表面辐射声功率的计算公式;丰富了声辐射问题中的模态分析内容.