目的探讨不同年龄助听器佩戴儿童真耳耦合腔差值(real ear to coupler difference,RECD)变化趋势。方法将2010年6月至2012年5月在四川大学华西医院耳鼻咽喉头颈外科听力中心进行助听器检测调试的132例重度至极重度听力损失儿童根据测试...目的探讨不同年龄助听器佩戴儿童真耳耦合腔差值(real ear to coupler difference,RECD)变化趋势。方法将2010年6月至2012年5月在四川大学华西医院耳鼻咽喉头颈外科听力中心进行助听器检测调试的132例重度至极重度听力损失儿童根据测试时年龄分为<1岁组(15例)、1岁组(26例)、2岁组(36例)、3岁组(29例)和4岁组(26例),各组分别进行双耳RECD测试并分析结果。结果随着年龄的增加,除<1岁组与2岁组左耳外,不同年龄儿童同侧耳RECD均值呈减小的趋势,并且相差≥2岁时差异有统计学意义;除2岁组外,同年龄组左右耳的RECD平均值差异有统计学意义。结论 RECD有助于儿童助听器的个体化调试,一般每两年应至少进行一次RECD测试,并应双耳测试。展开更多
目的比较正常儿童与分泌性中耳炎儿童RECD值的差异,探讨分泌性中耳炎儿童RECD值变化情况,为临床验配助听器提供参考。方法对照组正常儿童30例(60耳),平均年龄为4.5±2.4岁;实验组分泌性中耳炎儿童20例(40耳),平均年龄为4.7±2....目的比较正常儿童与分泌性中耳炎儿童RECD值的差异,探讨分泌性中耳炎儿童RECD值变化情况,为临床验配助听器提供参考。方法对照组正常儿童30例(60耳),平均年龄为4.5±2.4岁;实验组分泌性中耳炎儿童20例(40耳),平均年龄为4.7±2.3岁。用MedRX真耳分析仪分别测得实验组和对照组RECD值,进行统计学分析。结果实验组的RECD值在0.125、0.25、0.5 kHz处有统计学差异,P<0.05。在1~8 kHz各频率无统计学差异,P>0.05,但实验组在0.125、0.25、0.5 kHz对照组小6.7 dB HL,7.2 dB HL,5.6 dB HL且为负值。实验组的标准差范围为0.3~3.9,其标准差的平均值为2.5。对照组的标准差范围为0.7~2.1,其标准差的平均值为1.1。实验组的RECD值与声导纳值在各个频率,均无相关性。结论分泌性中耳炎儿童的RECD值在低频呈现负值,且变化较大,提示在验配助听器时要注意补偿在低频部分的增益。展开更多
In order to improve the frequency response and anti-interference characteristics of the smart electromechanical actuator(EMA)system,and aiming at the force fighting problem when multiple actuators work synchronously,a...In order to improve the frequency response and anti-interference characteristics of the smart electromechanical actuator(EMA)system,and aiming at the force fighting problem when multiple actuators work synchronously,a multi input multi output(MIMO)position difference cross coupling control coordinated strategy based on double‑closed-loop load feedforward control is proposed and designed.In this strategy,the singular value method of return difference matrix is used to design the parameter range that meets the requirements of system stability margin,and the sensitivity function and the H_(∞)norm theory are used to design and determine the optimal solution in the obtained parameter stability region,so that the multi actuator system has excellent synchronization,stability and anti-interference.At the same time,the mathematical model of the integrated smart EMA system is established.According to the requirements of point-to-point control,the controller of double-loop control and load feedforward compensation is determined and designed to improve the frequency response and anti-interference ability of single actuator.Finally,the 270 V high-voltage smart EMA system experimental platform is built,and the frequency response,load feedforward compensation and coordinated control experiments are carried out to verify the correctness of the position difference cross coupling control strategy and the rationality of the parameter design,so that the system can reach the servo control indexes of bandwidth 6 Hz,the maximum output force 20000 N and the synchronization error≤0.1 mm,which effectively solves the problem of force fighting.展开更多
文摘目的比较正常儿童与分泌性中耳炎儿童RECD值的差异,探讨分泌性中耳炎儿童RECD值变化情况,为临床验配助听器提供参考。方法对照组正常儿童30例(60耳),平均年龄为4.5±2.4岁;实验组分泌性中耳炎儿童20例(40耳),平均年龄为4.7±2.3岁。用MedRX真耳分析仪分别测得实验组和对照组RECD值,进行统计学分析。结果实验组的RECD值在0.125、0.25、0.5 kHz处有统计学差异,P<0.05。在1~8 kHz各频率无统计学差异,P>0.05,但实验组在0.125、0.25、0.5 kHz对照组小6.7 dB HL,7.2 dB HL,5.6 dB HL且为负值。实验组的标准差范围为0.3~3.9,其标准差的平均值为2.5。对照组的标准差范围为0.7~2.1,其标准差的平均值为1.1。实验组的RECD值与声导纳值在各个频率,均无相关性。结论分泌性中耳炎儿童的RECD值在低频呈现负值,且变化较大,提示在验配助听器时要注意补偿在低频部分的增益。
基金supported by the National Natural Science Foundation of China(No.52077100)the Aviation Science Foundation(No.201958052001)
文摘In order to improve the frequency response and anti-interference characteristics of the smart electromechanical actuator(EMA)system,and aiming at the force fighting problem when multiple actuators work synchronously,a multi input multi output(MIMO)position difference cross coupling control coordinated strategy based on double‑closed-loop load feedforward control is proposed and designed.In this strategy,the singular value method of return difference matrix is used to design the parameter range that meets the requirements of system stability margin,and the sensitivity function and the H_(∞)norm theory are used to design and determine the optimal solution in the obtained parameter stability region,so that the multi actuator system has excellent synchronization,stability and anti-interference.At the same time,the mathematical model of the integrated smart EMA system is established.According to the requirements of point-to-point control,the controller of double-loop control and load feedforward compensation is determined and designed to improve the frequency response and anti-interference ability of single actuator.Finally,the 270 V high-voltage smart EMA system experimental platform is built,and the frequency response,load feedforward compensation and coordinated control experiments are carried out to verify the correctness of the position difference cross coupling control strategy and the rationality of the parameter design,so that the system can reach the servo control indexes of bandwidth 6 Hz,the maximum output force 20000 N and the synchronization error≤0.1 mm,which effectively solves the problem of force fighting.
