In order to release valve piston tunnel / tube a shock wave has a free piston.

• 1. 阀活塞以及具有该阀活塞的阀 [P] . 中国专利： CN112240414A . 2021-01-19
• 2. 具有附加冷却通道的活塞及具有该活塞的内燃机 [P] . 中国专利： CN104364507B . 2017.03.15
• 3. PISTON RELEASE VALVE FOR TUNNEL / FREE PISTON SHOCK WAVE TUBE. [P] . 法国专利： FR2724456A1 . 1996-03-15

  机译： 隧道用活塞释放阀/自由活塞冲击波管。

• 4. PISTON RELEASE VALVE FOR FREE PISTON SHOCK TUBE/TUNNEL [P] . 日本专利： JPH08178092A . 1996-07-12

  机译： 活塞释放阀免费活塞冲击管/隧道

• 5. HEAT-RESISTANT AND PRESSURE-RESISTANT STRUCTURE, ITS MANUFACTURE, FREE-PISTON TYPE SHOCK WIND TUNNEL DEVICE, AND MANUFACTURE OF SHOCK TUBE OF THIS WIND TUNNEL DEVICE [P] . 日本专利： JPH0979937A . 1997-03-28

  机译： 耐热和耐压结构，其制造，自由活塞式电击风洞装置以及该风洞装置的电击管的制造

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• 2. THE INTERACTION BETWEEN SHOCK WAVES AND FOAM IN A SHOCK TUBE [J] . 施红辉, Kazuhiko Kawai, Motoyuki Itoh, 力学学报：英文版 . 2002,第003期
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• 4. Experiment on low-frequency electromagnetic waves propagating in shock-tube-generated magnetized cylindrical enveloping plasma [J] . Shaoshuai GUO, Kai XIE, Bin SUN, 等离子体科学和技术（英文版） . 2021,第007期
• 5. AN EXPERIMENTAL EVALUATION OF SHOCK WAVE STRENGTH AND PEAK PRESSURE IN A CONVENTIONAL SHOCK TUBE AND A FREE-PISTON COMPRESSOR [C] . Al-Falahi Amir, Yusoff M. Z, Yusaf T ASME international mechanical engineering congress and exposition;IMECE2008 . 2009
• 6. Optical velocimetric method for determining precursor shock strength in free-piston shock tube [D] . Tan, Boon Hun Benjamin 1995
• 7. Dissipative shock waves generated by a quantum-mechanical piston [O] . Maren E. Mossman, Mark A. Hoefer, Keith Julien, -1
• 8. Development of Velocity Interferometer and its Application to Piston Motion Measurement in a Compression Tube of Free Piston Shock Tube. [O] . Kensuke KOREMOTO, Tokitada HASHIMOTO, Kazuyoshi TAKAYAMA, 1999

• 1. Study of the Characteristics of Dust Acoustic Solitary Waves and Dust Acoustic Shock Waves in Electron Free Dusty Space Plasma [J] . Raicharan Denra ,Samit Paul ,Susmita Sarkar . 现代物理（英文） . 2018,第5期
• 2. 单活塞液压自由活塞发动机机活塞振动特性研究 [C] . 荆崇波 ,吴维 ,苑士华 . 2012年LMS中国用户大会 . 2012
• 3. 液压自由活塞发动机运动特性及其数字阀研究 [A] . 周盛 . 2006