英语翻译To examine the special vibration zone,the detailsof the head cover vibration (V) are shown in Figs.7and 8.The results were obtained at the load 540.6MW and the head 68.3 m with guide vane opening88.1%.From the time-history plots as shown

英语翻译To examine the special vibration zone,the detailsof the head cover vibration (V) are shown in Figs.7and 8.The results were obtained at the load 540.6MW and the head 68.3 m with guide vane opening88.1%.From the time-history plots as shown
英语翻译
To examine the special vibration zone,the details
of the head cover vibration (V) are shown in Figs.7
and 8.The results were obtained at the load 540.6
MW and the head 68.3 m with guide vane opening
88.1%.From the time-history plots as shown in Figs.7
(a) and 8(a),it can be seen that the vertical vibration
of the head cover is the strongest.This vibration value
(peak-to-peak amplitudes of vibration) is as large as
165 m,and exceeds the level-2 allowed value
[11]
.
The vibration spectrum shown in Fig.8 (b) reveals a
dominant frequency at 4.56f
n
(or 5.7 Hz).The
amplitude of the 4.56 multiple-frequency vibration is
84 m.Although the first dominant frequency for the
horizontal vibration is 1.0 multiple frequency (1.25
Hz),the 4.56 multiple frequency becomes the second
dominant one.This special vibration frequency was
confirmed to exist under the load of 530 MW-545
MW.
Fig.8 Vertical vibration of head cover at load of 540.6 MW
This special vibration frequency,4.56f
n
,was
observed in the vibration spectrum for upper and low
brackets,especially in horizontal vibration results,
although the level is not so high.
3.2.2 Pressure fluctuation
As mentioned above,the pressure transducers
located at the inlet of spiral case indicated that the
inlet flow is in good condition whenever the load is
low or high.Figure 9 presents the pressure fluctuation
at the inlet of spiral case at the load of 540.6 MW.It
can be found that the level of the pressure fluctuation
is very low.Simultaneously,the pressure fluctuation
under the head cover exhibits the similar features,as
shown in Fig.10.The amplitude is less than 1 kPa at
this special load.No evident dominant frequency with
large fluctuation level was found for the pressure
fluctuation.However,the pressure fluctuation in draft
tube revealed a different frequency spectrum,as
shown in Fig.11.There is a dominant frequency 4.56f
n
,
or 5.70 Hz,in the frequency spectrum in this operating
condition.The amplitude of pressure fluctuation at
this frequency is 13 kPa with the average pressure 148
kPa.This frequency corresponds to the one at which a
strong vibration of head cover exists.
别翻这个了。翻译这个吧。
This special vibration frequency,4.56f,was
observed in the vibration spectrum for upper and low
brackets,especially in horizontal vibration results,
although the level is not so high.
3.2.2 Pressure fluctuation
As mentioned above,the pressure transducers
located at the inlet of spiral case indicated that the
inlet flow is in good condition whenever the load is
low or high.Figure 9 presents the pressure fluctuation
at the inlet of spiral case at the load of 540.6 MW.It
can be found that the level of the pressure fluctuation
is very low.Simultaneously,the pressure fluctuation
under the head cover exhibits the similar features,as
shown in Fig.10.The amplitude is less than 1 kPa at
this special load.No evident dominant frequency with
large fluctuation level was found for the pressure
fluctuation.However,the pressure fluctuation in draft
tube revealed a different frequency spectrum,as
shown in Fig.11.

英语翻译To examine the special vibration zone,the detailsof the head cover vibration (V) are shown in Figs.7and 8.The results were obtained at the load 540.6MW and the head 68.3 m with guide vane opening88.1%.From the time-history plots as shown
This special vibration frequency,4.56f,was observed in the vibration spectrum for upper and low brackets,especially in horizontal vibration results,although the level is not so high.
尽管振动水平不高,但在上下托架的振动光谱中观察到了4.56f这种特殊振动频率,尤其是在水平振动结果之中.
3.2.2 Pressure fluctuation
3.2.2压力波动
As mentioned above,the pressure transducers located at the inlet of spiral case indicated that the inlet flow is in good condition whenever the load is low or high.Figure 9 presents the pressure fluctuation at the inlet of spiral case at the load of 540.6 MW.It can be found that the level of the pressure fluctuation is very low.Simultaneously,the pressure fluctuation under the head cover exhibits the similar features,as shown in Fig.10.The amplitude is less than 1 kPa at this special load.No evident dominant frequency with large fluctuation level was found for the pressure fluctuation.However,the pressure fluctuation in draft tube revealed a different frequency spectrum,as shown in Fig.11.
如上所述,位于水轮机蜗壳进水口处的压力传感器表明,无论载荷高低,进水流量的状况很好.图9显示了荷载为540.6 MW时蜗壳进水口处的压力波动.可以发现压力波动的水平很低.同时,顶盖下的压力波动也显示出类似特征,如图10所示.在这个特殊荷载时的振幅小于1 kPa (千帕).在此种压力波动水平时,没有发现大波动水平下的明显主频.然而,尾水管(吸出管)处的压力波动显示出不同的频谱,如图11所示.

在图7
和图8 所示的气缸盖罩的振动（V）的详细信息。结果获得了在负荷540.6
兆瓦，导叶开度
为88.1％，68.3米，头。Figs.7
（a）和图8（a）中所示的时程图，可以看出，
在气缸盖罩的垂直振动是最强的。此振动值
（峰-峰振幅的振动）是一样大
165米的，超过对level-2允许值
[11]
。
...

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在图7
和图8 所示的气缸盖罩的振动（V）的详细信息。结果获得了在负荷540.6
兆瓦，导叶开度
为88.1％，68.3米，头。Figs.7
（a）和图8（a）中所示的时程图，可以看出，
在气缸盖罩的垂直振动是最强的。此振动值
（峰-峰振幅的振动）是一样大
165米的，超过对level-2允许值
[11]
。
示于图8（b）条的振动光谱揭示了
主频在4.56f
N
（5.7赫兹）。
4.56多频振动的振幅是
84米。虽然第一显性的
水平振动的频率是1.0多频率（1.25
赫兹），4.56多频成为第二个
主导。此特定的振动频率的
确认存在530 MW 545
MW 的负荷下的振动频谱中观察到的
图8的竖向振动的气缸盖罩在540.6 MW
这种特殊的振动频率，4.56f
Ñ 负载
，
上，下
括号内的，特别是在水平方向的振动的结果，
虽然没有这么高的水平。
3.2.2压力波动
正如上文所述，
在进气口位于蜗壳的压力换能器的
入口流处于良好状态，负载时是
低或高。图9给出了
在负载为540.6兆瓦蜗壳的入口压力波动。
可以发现，压力波动的水平
是非常低的。同时，
气缸盖罩的压力波动下表现出类似的功能，如
在图10所示。的振幅在
这个特殊的负载小于1千帕。
被发现的压力
波动大的波动水平没有明显的主频。草案
管中的压力波动，但显示不同的频谱，
如图11所示。是一个主频4.56f
Ñ
，
或5.70赫兹，在此操作
条件下的频谱。
该频率处的压力脉动的振幅是13千帕斯卡的平均压力148
千帕。此频率对应的一个
气缸盖罩的一个强烈的振动存在。

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检查的特殊振动区，细节头罩振动（V）在figs.7and 8所示。在负载540.6mw得到的结果和头68.3米，导叶opening88.1 %。从时间历史曲线显示在图。7（a）和8（一个），可以看出，垂直振动头罩是最强的。这种振动值（峰值振幅的振动）是大as165米，超过2级允许值[ 11 ]。图所示的振动光谱（b）显示在4.56fn主导频率（5.7赫兹）。4.56多个频率的振动的振幅is84 M...

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检查的特殊振动区，细节头罩振动（V）在figs.7and 8所示。在负载540.6mw得到的结果和头68.3米，导叶opening88.1 %。从时间历史曲线显示在图。7（a）和8（一个），可以看出，垂直振动头罩是最强的。这种振动值（峰值振幅的振动）是大as165米，超过2级允许值[ 11 ]。图所示的振动光谱（b）显示在4.56fn主导频率（5.7赫兹）。4.56多个频率的振动的振幅is84 M.虽然水平振动的第一主导频率是1多个频率（1.25Hz），4.56多个频率变seconddominant一。这种特殊的振动频率影响到530 mw-545mw荷载作用下的竖向振动存在。图8头罩在540.6 mwthis特殊的振动频率，负载4.56fn，观察上lowbrackets振动谱，特别是在水平振动的结果，虽然水平不高。3.2.2 fluctuationas上述压力，压力transducerslocated在蜗壳进口表明，大小是在良好的条件时，流量负载低或高。图

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检查特殊振动区,detailsof头部盖振动(V)Figs.7and 8所示。 这个结果在负载540.6 mw和头部与导叶opening88.1% 68.3米。 从时域情节如无花果7(a)和8(一个),可以看到,垂直vibrationof头部盖是最强的。这个振动值(峰振幅的振动)一样大as165米,超过2允许价值[11]。振动谱图8所示(乙)揭示了决定性频率4.56 fn(或5.7赫兹)。Thea...

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检查特殊振动区,detailsof头部盖振动(V)Figs.7and 8所示。 这个结果在负载540.6 mw和头部与导叶opening88.1% 68.3米。 从时域情节如无花果7(a)和8(一个),可以看到,垂直vibrationof头部盖是最强的。这个振动值(峰振幅的振动)一样大as165米,超过2允许价值[11]。振动谱图8所示(乙)揭示了决定性频率4.56 fn(或5.7赫兹)。Theamplitude 4.56的多频振动is84 m。虽然第一优势频率为thehorizontal振动是1.0倍频(1.25赫兹),4.56倍频成为seconddominant一。 这种特殊的振动频率wasconfirmed存在根据负载530 mw - 545 mw无花果。8竖向振动的头罩在负载为540.6 MWThis特殊的振动频率,4.56 fn,wasobserved振动频谱的上部和lowbrackets,特别是在水平振动的结果,尽管水平不那么高3 2 2压力fluctuationAs上面提到的,在进口的压力transducerslocated蜗壳表示,theinlet流是在良好的条件只要负载islow或高。图9给出了压力fluctuationat蜗壳进口的负载540.6 MW。 它可以发现水平的压力fluctuationis非常低。同时,压力fluctuationunder头部盖展现了类似的功能,如附图所示,图10。振幅小于1 kPa,听到这个特殊的负载。没有明显的优势频率withlarge波动水平为pressurefluctuation被发现。 然而,压力波动drafttube却揭示了一个不同的频率谱,如附图所示,在图11。有一个优势频率4.56 fn,或5.70赫兹,在频谱在这个operatingcondition。 在这个压力波动的振幅频率是13 - w

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