1. A noise reduction apparatus mounted in a container data center, the container data center comprising a portable container and a plurality of servers accommodated in the container, each server comprising a fan, the noise reduction apparatus comprising:
a first sensor mounted at an entrance of the container, wherein when a user enters the container through the entrance, the first sensor outputs a first control signal, and when the user leaves the container through the entrance, the first sensor outputs a second control signal;
a plurality of fan adjusting systems, wherein each fan adjusting system corresponds to a server, the plurality of fan adjusting systems slow down the plurality of fans according to the first control signal, and speed up the plurality of fans according to the second control signal; and
a plurality of temperature sensors, wherein each temperature sensor corresponds to a server to sense temperature inside the corresponding server, the plurality of temperature sensors transmit the temperatures to the plurality of fan adjusting systems respectively, each fan adjusting system speeds up the fan when the corresponding temperature exceeds a preset temperature.
2. The noise reduction apparatus of claim 1, further comprising a timer, wherein the timer starts to time according to the first control signal, when the timer reaches a preset time, the timer outputs a third control signal, the fan adjusting systems speed up the fans in the servers according to the third control signal.
3. The noise reduction apparatus of claim 1, wherein the first sensor is a gas pressure sensor.
4. The noise reduction apparatus of claim 1, wherein the first sensor is an infrared sensor.
5. The noise reduction apparatus of claim 1, wherein the fan adjusting systems adjust duty cycle of pulse width modulation signals to slow down or speed up the fans.
6. A container data center comprising:
a container;
a plurality of servers accommodated in the container; and
a noise reduction apparatus comprising:
a first sensor mounted at an entrance of the container, wherein when an user enters the container, the first sensor outputs a first control signal, when the user leaves the container, the first sensor outputs a second control signal;
a plurality of fan adjusting systems, wherein each fan adjusting system corresponds to a server, the plurality of fan adjusting systems slow down a plurality of fans in the servers according to the first control signal, and speed up the plurality of fans according to the second control signal; and
a plurality of temperature sensors, wherein each temperature sensor corresponds to a server to sense temperature inside the corresponding server, the plurality of temperature sensors transmit the temperatures to the plurality of fan adjusting systems respectively, each fan adjusting system speeds up the fan when the corresponding temperature exceeds a preset temperature.
7. The container data center of claim 6, whether the noise reduction apparatus further comprises a timer, the timer starts to time according to the first control signal, when the timer reaches a preset time, the timer outputs a third control signal, the fan adjusting systems speed up the fans in the servers according to the third control signal.
8. The container data center of claim 6, wherein the first sensor is a gas pressure sensor.
9. The container data center of claim 6, wherein the first sensor is an infrared sensor.
10. The container data center of claim 6, wherein the fan adjusting systems adjust duty cycle of pulse width modulation signals to slow down or speed up the fans.
11. A noise reduction method used for a container data center, the container data center comprising a container and a plurality of servers accommodated in the container, the noise reduction method comprising:
determining whether a user enters the container;
slowing down a plurality of fans in the plurality of servers by a plurality of fan adjusting systems correspondingly when the user enters the container;
sensing temperatures inside the plurality of servers by a plurality of temperature sensors respectively;
determining whether the temperatures exceed a preset temperature; and
speeding up a fan when the temperature inside a corresponding server exceeds the preset temperature.
12. The noise reduction method of claim 11, further comprising:
starting to time by a timer when the user enters the container;
determining whether the timer reaches a preset time; and
speeding up the fans when the timer reaches the preset time.
13. The noise reduction method of claim 11, further comprising:
determining whether the user leaves the container; and
speeding up the fans when the user leaves the container.
14. The noise reduction method of claim 11, wherein the step \u201cdetermining whether a user enters the container\u201d comprises:
sensing atmospheric pressure at an entrance of the container and determining whether the atmospheric pressure at the entrance changes;
when the atmospheric pressure at the entrance changes, it is determined that the user enters the container; and
when the atmospheric pressure at the entrance does not change, it is determined that the user does not enter the container;
wherein the step \u201cdetermining whether the user leaves the container\u201d comprises:
sensing atmospheric pressure at an entrance of the container and determining whether the atmospheric pressure at the entrance changes again;
when the atmospheric pressure at the entrance changes again, it is determined that the user leaves the container; and
when the atmospheric pressure at the entrance does not change again, it is determined that the user does not leave the container.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An adaptive circuit for reducing vibration or shock induced errors in an inertial sensor, the inertial sensor including at least one proof mass at least one and sense electrode for sensing rotational motion of the sensor about a rate axis, the adaptive circuit comprising:
a sense bias voltage source electrically connected to the at least one sense electrode and adapted to produce a charge on a corresponding proof mass of the at least one proof mass based at least in part on the rotational motion of the inertial sensor about the rate axis;
at least one amplifier electrically connected to the at least one proof mass and adapted to output a rate signal based at least in part on the charge produced on the at least one proof mass;
a means for detecting andor anticipating the external vibration or shock on the inertial sensor; and
a dampening resistive element adapted to dampen proof mass motion in response to the external vibration or shock on the inertial sensor, further comprising a dampening switch selector adapted to selectively switch-in the dampening resistive element and dampen proof mass motion when the external vibration or shock is detected andor anticipated.
2. The adaptive circuit of claim 1, wherein said means for detecting andor anticipating an external vibration or shock on the inertial sensor includes a signal or command from a sensor.
3. The adaptive circuit of claim 1, wherein said means for detecting andor anticipating an external vibration or shock on the inertial sensor includes a signal or command from a supervisory system of the inertial sensor.
4. The adaptive circuit of claim 1, wherein said dampening resistive element is a fixed-value resistor.
5. The adaptive circuit of claim 1, wherein said dampening resistive element includes a plurality of fixed-value resistors, and wherein said dampening switch selector is adapted to selectively switch-in one or more of said plurality of fixed-value resistors based at least in part on the magnitude of the external vibration or shock detected andor anticipated.
6. The adaptive circuit of claim 1, wherein said dampening resistive element is a variable resistor adapted to vary in resistivity based at least in part on the magnitude of the external vibration or shock detected andor anticipated.
7. The adaptive circuit of claim 1, wherein the dampening resistive element is disposed in series between the at least one proof mass and the at least one amplifier.
8. The adaptive circuit of claim 1, wherein said inertial sensor is a gyroscope.
9. An adaptive circuit for reducing vibration or shock induced errors in an inertial sensor, the inertial sensor including at least one proof mass at least one and sense electrode for sensing rotational motion of the sensor about a rate axis, the adaptive circuit comprising:
a sense bias voltage source electrically connected to the at least one sense electrode and adapted to produce a charge on a corresponding proof mass of the at least one proof mass based at least in part on the rotational motion of the inertial sensor about the rate axis;
at least one amplifier electrically connected to the at least one proof mass and adapted to output a rate signal based at least in part on the charge produced on the at least one proof mass;
a means for detecting andor anticipating the external vibration or shock on the inertial sensor; and
a dampening resistive element adapted to dampen proof mass motion in response to the external vibration or shock on the inertial sensor, wherein the dampening resistive element is disposed in series between the at least one sense electrode and the sense bias voltage source.
10. The adaptive circuit of claim 9, further comprising a switch capacitor adapted to stabilize the sense bias voltage source supplied to the at least one sense electrode.
11. The adaptive circuit of claim 9, farther comprising a controller adapted to selectively switch-in the dampening resistive element and dampen proof mass motion based at least in part current flow through a sense resistor connected to the sense bias voltage source.
12. A method of actively reducing vibration or shock induced errors in an inertial sensor operating within an environment, the inertial sensor including at least one proof mass and at least one sense electrode for sensing rotational motion of the sensor about a rate axis, the method comprising the steps of:
connecting a sense bias voltage source to the at least one sense electrode and producing a charge on a corresponding proof mass of the at least one proof mass based at least in part on the rotational motion of the inertial sensor about the rate axis;
connecting an amplifier to the at least one proof mass and outputting a rate signal based at least in part on the charge produced on the at least one proof mass;
detecting andor anticipating an external vibration or shock within the environment; and
adjusting the dampening of the at least one proof mass based at least in part on the detected andor anticipated vibration or shock within the environment, wherein said step of adjusting the dampening of the at least one proof mass includes the steps of:
selectively switching-in a dampening resistive element in series between the at least one sense electrode and the sense bias voltage source; and
dampening the at least one proof mass in response to the vibration or shock within the environment.
13. The method of claim 12, wherein said step of adjusting the dampening of the at least one proof mass includes the steps of:
selectively switching-in a dampening resistive element in series between the at least one proof mass and the amplifier; and
dampening the at least one proof mass in response to the vibration or shock within the environment.