主题：请教Qms、Qes、Qts各自的物理意义是什么!!!!

初到此地,多多指教

多讨论都结论

呵呵.不太懂的啊

做个记号,有空再来看下.

此主题相关图片如下：等效电路.jpg



扬声器在无限大障板上的低频等效电路(阻抗型,全部转换为力学等效元件)

很明显,上面的图是串联电路,会产生串联谐振.

忽略源内阻Rg的影响,则很容易得出谐振时的各种Q值.

一般定义,
Mms=Mmd+2Mmr

阻的不同,则对应者不同的Q,如Qts Qes Qms

上图，也忽略了音圈电感。
高频时，必须加进去考虑。还有辐射阻。

Ｑｔｓ是指的总的ＳＰＥＡＫＥＲ　总的Ｑ值．
而对于Ｑｍｓ是指的是机械Ｑ值．
而对于Ｑｅｓ指的是电气Ｑ值了．
总体讲的就是Ｑ值也就是衡量一个ＳＰＥＡＫＥＲ的品质因数了．
而对于Ｑｔｓ就是Ｑｍｓ　Ｑｅｓ成并联关系了．

楼上的话多了。

这几个TS参数我也糊涂了，还向初哥请教过，我的参考资料都是王老的两本书设计手册和工艺手册，
就是这两本书里面的计算方法都不一样，特别是工艺手册，上面的公式推导下来相互之间都不能等式
还望有高人指点一下，或者推荐一下其它的书。

真的没有一本书或一篇文章讲清楚吗?

基本意义前面不是说过了吗?

                                                            What is Q

"Q" is one of those dimensionless numbers that causes no small amount of consternation amongst those who don't understand what it means, as well as among those that THINK they do! However, the principle behind Q, when used in the context of loudspeakers, is VERY simple. It is simply the ratio between energy storing and energy dissipative mechanisms at resonance. In electrical terms, it is the ratio of the reactance to the resistance.

A high Q indicates that for the amount of energy stored in a resonant system, the mechanisms that dissipate that energy are small. So a high-Q system will tend to have a resonance that decays slowly, because the amount of resistance available to dissipate the energy is small compared to the amount of energy stored. A low-Q system will tend to dampen the resonant motion quickly, because the energy is dissipated quickly and removed from the resonant system.

There are primarily 2 energy dissipating mechanisms available in a loudspeaker driver: mechanical and electrical (there is another, acoustical, but it is VERY small when compared to the other mechanisms). The mechanical dissipative mechanisms are primarily the frictional losses in the driver's suspension, and, to a lesser extent, acoustic absorption. There are, essentially, two electrical mechanisms for energy dissipation: the DC resistance to the voice coil and the output resistance of the amplifier. In almost all cases, the DC resistance of the voice coil completely dominates.

These two mechanisms, mechanical and electrical, determine, respectively, the mechanical Q (Qms) and the electrical Q(Qes) of the loudspeaker driver. Their parallel combination determines the total Q (Qts) of the loudspeaker driver." Amen.

When we mount a loudspeaker driver onto a baffle system we also have to take into account the Q of the baffle system to arrive at the total system Q. To work out the total Q of the driver and baffle system you simply multiply the baffle system Q with the total Q of the loudspeaker driver. Closed boxes store energy that interacts with the loudspeaker driver in complex ways, especially in vented enclosures. Boxes themselves also have resonances. Normally a high-Q closed box is combined with low-Q loudspeaker driver to give a desirable total system Q. But when we mount a loudspeaker driver on an open baffle this situation is reversed. An open baffle stores no energy and has a low-Q of 0.2 and Carver chose to use a high-Q woofer with a total Q of 3+ to arrive at a desirable total system Q.

Carver's high-Q woofer was also chosen for another good reason to do with mounting a woofer on an open baffle. As we decrease in frequency or increase in wavelength, the system initially behaves as an infinite baffle. When the wavelengths are long enough to be a quarter of the baffle dimensions, the waves begin to cancel each other around the edges of the dipole baffle. The wave travels out to the edge (1/4) and back to the opposite side of the vibrating speaker cone, where it is exactly out of phase and cancels out. Quarter wave cancellation on an open baffle is a first order phenomenon – the roll-off occurs at 6dB per octave. When we reach the free-air resonance point of the high-Q woofer we add to this the second-order sub-resonance fall-off of the high-Q woofer to end up with a third-order or 18db per octave fall-off below the free-air resonance point of the high-Q woofer (this makes a good rumble filter in the Carver case).

In loudspeaker literature we can look at the family of curves for the frequency response of a loudspeaker driver on an infinite baffle as we decrease the frequency. Starting with the rolled-off curve when Q=0.5 (critically damped), then the Butterworth graph with Q=0.71 (maximally flat), then a little ripple at Q=1, then clearly a bumped-up graph at Q=1.4. When the Q is higher than any you can usually find in loudspeaker driver catalogues you start to get boosting above the resonance point of the loudspeaker driver, and a sufficiently high-Q will result in a slope of about 6dB per octave above the free-air resonance point of the loudspeaker driver. This increase of 6dB per octave of the high-Q loudspeaker driver can be used to counteract the 6dB per octave quarter wave cancellation to give a flat frequency response right down to the free-air resonant frequency of the loudspeaker driver. This is a much more elegant solution to the problem of quarter wave cancellation on an open baffle to that used by Celestion, etc of using a conventional low-Q woofer with electronic equalization since it does not involve additional amplifier power and the necessity of electronic equalization equipment.High-Q woofers are relatively easy to design/make. Both ways of overcoming quarter wave cancellation on a baffle entail the use of long throw woofers for the safe operation of the woofer.

学习中

有些事越想越不懂啊   ,    Q 与智商相差不大啊

Qms   力学智商
Qes   电学智商
Qts   总智商

啥叫智商


智商高,反应快吧
太聪明,太笨多不好,

多大的智商,住在多大房子里,有无没窗,最好?

 智商太高或者太低的都比较危险,属于偏激或者精神有问题的一类,所以基本上住黑房子,没窗.
智商正常的人呢,那就是普通人了,住的都是有窗的正常房子.
这个世界上正常人多,那么也就说建设的正常房子多.
至于智商多少住多大的房子倒是没明确规定,因为跟度量,抗压能力有关.