The vehicle-mounted equipment is easy to be disturbed by external vibration excitations during transportation, which is harmful to the measurement accuracy and performance of the equipment. Aiming at the vibration isolation of the vehicle-mounted equipment, a semiactively controlled quasi-zero stiffness (QZS) vibration isolator with positive and negative stiffness is proposed. The vertical spring is paralleled with a magnetorheological (MR) damper, and the semiactive on-off control scheme is adopted to control the vibration. The analytical expression of the isolator’s displacement transmissibility is derived via the averaging method. Then, the vibration isolation performance under different road excitations and different driving speeds is simulated and compared with the uncontrolled passive QZS vibration isolator. In addition, the mechanical structure of the semiactive QZS isolator is designed and manufactured, and the test system is built by LabVIEW software and PXI embedded system. The isolation effect of the semiactive QZS isolator is verified through test data. It is found that the proposed semiactive QZS isolator shows excellent vibration isolation performance under various road excitations, while the passive QZS isolator is effective only under harmonic excitations. The vertical acceleration of vehicle-mounted device can be decreased over 70% after isolation, and the vibration isolation effect is remarkable. The design idea and research results of the semiactive QZS isolator may provide theoretical guidance and engineering reference for vibration isolation.

中文翻译：

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车用半主动准零刚度隔振系统的设计与研究

车载设备在运输过程中容易受到外界振动激励的干扰，对设备的测量精度和性能产生不利影响。针对车载设备的隔振问题，提出了一种具有正负刚度的半主动控制准零刚度(QZS)隔振器。垂直弹簧与磁流变（MR）阻尼器并联，采用半主动开关控制方案控制振动。通过平均法推导出隔振器位移传递率的解析表达式。然后，对不同路面激励和不同行驶速度下的隔振性能进行了仿真，并与非受控被动QZS隔振器进行了比较。此外，设计制造了半主动QZS隔离器的机械结构，并采用LabVIEW软件和PXI嵌入式系统搭建了测试系统。通过测试数据验证了半主动QZS隔离器的隔离效果。结果表明，所提出的半主动 QZS 隔振器在各种道路激励下表现出优异的隔振性能，而被动 QZS 隔振器仅在谐波激励下有效。隔振后车载装置垂直加速度可降低70%以上，隔振效果显着。半主动QZS隔振器的设计思路和研究成果可为隔振提供理论指导和工程参考。测试系统由LabVIEW软件和PXI嵌入式系统搭建。通过测试数据验证了半主动QZS隔离器的隔离效果。结果表明，所提出的半主动 QZS 隔振器在各种道路激励下表现出优异的隔振性能，而被动 QZS 隔振器仅在谐波激励下有效。隔振后车载装置垂直加速度可降低70%以上，隔振效果显着。半主动QZS隔振器的设计思路和研究成果可为隔振提供理论指导和工程参考。测试系统由LabVIEW软件和PXI嵌入式系统搭建。通过测试数据验证了半主动QZS隔离器的隔离效果。结果表明，所提出的半主动 QZS 隔振器在各种道路激励下表现出优异的隔振性能，而被动 QZS 隔振器仅在谐波激励下有效。隔振后车载装置垂直加速度可降低70%以上，隔振效果显着。半主动QZS隔振器的设计思路和研究成果可为隔振提供理论指导和工程参考。结果表明，所提出的半主动 QZS 隔振器在各种道路激励下表现出优异的隔振性能，而被动 QZS 隔振器仅在谐波激励下有效。隔振后车载装置垂直加速度可降低70%以上，隔振效果显着。半主动QZS隔振器的设计思路和研究成果可为隔振提供理论指导和工程参考。结果表明，所提出的半主动 QZS 隔振器在各种道路激励下表现出优异的隔振性能，而被动 QZS 隔振器仅在谐波激励下有效。隔振后车载装置垂直加速度可降低70%以上，隔振效果显着。半主动QZS隔振器的设计思路和研究成果可为隔振提供理论指导和工程参考。