本文讨论了天然气声速计算方法,并对该方法在超声流量计在线检验中的应用进行了研究。采用美国气体协会(American Gas Association《)AGA8》和《AGA10》两份报告的计算方法,研制了一套天然气声速计算和超声流量计声速核查软件,可以有效...本文讨论了天然气声速计算方法,并对该方法在超声流量计在线检验中的应用进行了研究。采用美国气体协会(American Gas Association《)AGA8》和《AGA10》两份报告的计算方法,研制了一套天然气声速计算和超声流量计声速核查软件,可以有效地计算天然气的声速、临界流系数、等熵指数和定压比热容等天然气热力学参数,实现了超声流量计在线检验,有效地延长流量计的送检周期,节约企业的送检成本。展开更多
An active balancing technology has been applied to solve the severe vibration caused by sudden unbalance in rotating machineries during their working process. First, based on the generation principle of sudden unbalan...An active balancing technology has been applied to solve the severe vibration caused by sudden unbalance in rotating machineries during their working process. First, based on the generation principle of sudden unbalance, a simulation test stand with a sudden unbalance generation device was set up. Then, the balancing planes were optimized by using the finite element method （FEM） to determine the position for balancing device installation. Finally, the active balancing experiments were carried out on the test stand. The experimental results indicate that the vibration response caused by sudden unbalance can be decreased from 77μm to 8μm by using the active balancing device, and the vibration amplitude reduction was up to 89.6%. From this example, it can be concluded that the active balancing device, which is installed on a proper position of the rotor, can effectively control the random transient synchronous vibration, demonstrating its high value in engineering practice.展开更多
文摘本文讨论了天然气声速计算方法,并对该方法在超声流量计在线检验中的应用进行了研究。采用美国气体协会(American Gas Association《)AGA8》和《AGA10》两份报告的计算方法,研制了一套天然气声速计算和超声流量计声速核查软件,可以有效地计算天然气的声速、临界流系数、等熵指数和定压比热容等天然气热力学参数,实现了超声流量计在线检验,有效地延长流量计的送检周期,节约企业的送检成本。
基金Supported by the National Natural Science Foundation of China （No. 50635010） and the National High Technology Research and Development Program of China （ No. 2007AA04Z422 ）.
文摘An active balancing technology has been applied to solve the severe vibration caused by sudden unbalance in rotating machineries during their working process. First, based on the generation principle of sudden unbalance, a simulation test stand with a sudden unbalance generation device was set up. Then, the balancing planes were optimized by using the finite element method （FEM） to determine the position for balancing device installation. Finally, the active balancing experiments were carried out on the test stand. The experimental results indicate that the vibration response caused by sudden unbalance can be decreased from 77μm to 8μm by using the active balancing device, and the vibration amplitude reduction was up to 89.6%. From this example, it can be concluded that the active balancing device, which is installed on a proper position of the rotor, can effectively control the random transient synchronous vibration, demonstrating its high value in engineering practice.
