Jude Liu, Ph.D.

Jude Liu, Ph.D.

  • Associate Professor of Agricultural and Biological Engineering
  • Machinery and Biomass Logistics
  • Program contact for Agricultural Systems Management Minor; Off-Road Equipment Minor
218 Agricultural Engineering Building
Shortlidge Road

University Park, PA 16802

Areas of Expertise

  • Agricultural Machinery
  • Machine design and test
  • Biomass harvesting, handling and logistics
  • Biomass in-field processing and densification
  • Hydraulics and Pneumatic system design and test


  • Ph.D. in Biosystems Engineering, University of Manitoba, Canada
  • B.S., M.S., Ph.D. in Automotive Engineering, Jilin University, China


  • ASM 310 - Power Transmission in Agriculture
  • B E 461 - Design of Fluid Power Systems
  • B E 306 - Machines for Agricultural and Biological Processing
  • ASM 420 - Principles of Off-Road Machines
  • ABE 885 - Biomass Harvesting and Logistics

For information about courses please visit the LionPATH Course Catalog.

Research Interests

Machine Systems for Biomass and Specialty Crops

Machine Systems for Biomass Harvesting and Processing 

Dr. Liu's research in this area focuses on (1) testing mechanical properties of dedicated energy crops; (2) studying field efficiency and capacity of different machine systems for biomass feedstocks harvesting and processing; and (3) modeling biomass feedstocks logistics systems.

Machinery for Specialty Crop Production 

The cultivation and harvest of specialty crops for the fresh fruit market are labor intensive. Dr. Liu's research activities in this area include innovative technologies and equipment development for: (1) mechanical fruit thinning; and (2) mechanical harvest-assist systems of specialty crops.

Off-Road Equipment

Agricultural production related off-road equipment is another area of interest. Dr. Liu's interested topics include: soil compaction and relevant environmental issues, tillage and soil and water conservation, power performance, tractive efficiency and fuel consumption of off-road power units. 

Membership And Certification In Professional Societies

  • Professional Engineer, Registered in Saskatchewan, Canada
  • Certification in Higher Education Teaching, University of Manitoba, Canada
  • Member, American Society of Agricultural and Biological Engineers (since 2000)
  • Member, SAE International
  • Member, International Fluid Power Society


Redcay, S., A. Koirala, J. Liu. 2018. Effects of roll and flail conditioning systems on mowing and baling of Miscanthus (giganteus) feedstock. Biosystems Engineering, Volume 172, 134-143.

Liu, J. and T. Wang. 2017. Energy Consumption of Herbaceous Biomass Bulk Densification. Innovative Energy & Research, 6(2): 175

Zhang, Z., P. Heinemann, J. Liu, J. R. Schupp, T.A. Baugher. 2017. Brush Mechanism for Distributing Apples in a Low-Cost Apple Harvest-Assist Unit. Applied Engineering in Agriculture, 33(2).

Zhang, Z., P. Heinemann, J. Liu, J. R. Schupp, T.A. Baugher. 2016. Design and Field Test of a Low-Cost Apple Harvest-Assist Unit. Transactions of the ASABE, 59(5), 1149-1156.

Zhang, Z., P. Heinemann, J. Liu, J. R. Schupp, T. A. Baugher. 2016. The Development of Mechanical Apple Harvesting Technology: A Review. Transactions of the ASABE, 59(5), 1165-1180.

Kemmerer, B., and J. Liu. 2014. Effect of Harvesting Time and Moisture Content on Energy Consumption of Compressing Switchgrass. American Journal of Plant Sciences 21(5), 3241-3249

Liu, J., R. Grisso, and J. Cundiff. 2013. Harvest systems and analysis for herbaceous biomass. Chapter 6, Biomass Now - Cultivation and Utilization. Ed. M. D. Matovic. Rijeka, Croatia:  InTech.

Brownell, D., J. Liu, J. Hilton, T. Richard, G. R. Cauffman, B. R. Macafee. 2012. Evaluation of two harvesting systems for herbaceous biomass. Transactions of the ASABE 55(5): 1651-1658.

Liu, J. and R. L. Kushwaha. 2012. Effect of Travel Speed and Vertical Load on the Subsoil Force and Displacement under a Smooth Steel Roller. Journal of Terramechanics 49 (5): 263–270.

Brownell, D. and J. Liu. 2012. Managing biomass feedstocks: selection of satellite storage locations for different harvesting systems. CIGR Journal 14(1): 74-81.

Kemmerer, B. and J. Liu. 2012. Large square baling and bale handling efficiency – a case study. Agricultural Sciences 3(2): 178-183.

You, Y., D. Wang and J. Liu. 2012. A device for mechanical remediation of degraded grasslands. Soil & Tillage Research 118:1-10.

Sadeka, M. A., Y. Chen, and J. Liu. 2011. Simulation of shear behavior of a sandy soil under different soil moisture content and bulk density conditions. Journal of Terramechanics 48(6): 451-458.

Brownell, D. and J. Liu. 2011. Four harvesting options for herbaceous biomass handling: Field test and cost analysis. International Journal of Agricultural and Biological Engineering 2011 4(3): 1-11.

Liu, J. and B. Kemmerer. 2011. Field performance analysis of a tractor and a large square baler. SAE paper No. 2011-01-2302.

Liu, J., Y. Chen and R. L. Kushwaha. 2010. Effect of tillage speed and straw length on soil and straw movement by a sweep. Soil & Tillage Research 109:9–17. 

Liu, J. and R. L. Kushwaha. 2010. Force transmitted below the soil surface by human gait. Journal of Terramechanics 47(5): 337-342

Liu, J., D.A. Lobb, Y. Chen and R. L. Kushwaha. 2008. Steady-state models for the movement of soil and straw during tillage with a single sweep. Transactions of the ASABE 51(3):781-789.

Liu, J., Y. Chen, D. A. Lobb and R. L. Kushwaha. 2007. Soil−straw−tillage tool interaction: field and soil bin study. Canadian Biosystems Engineering 49:2.1-2.6.

Chen, Y., J. Liu, J. Gratton. 2004. Engineering perspectives of hemp plant, harvesting and processing in Canada – A review. Journal of Industrial Hemp 9(2): 23-39.
Chen, Y., J. Gratton, J. Liu. 2004. Power requirements of hemp cutting and conditioning. Biosystems Engineering 87(4):417- 424.
Chen, Y. and J. Liu. 2003. Development of a windrower for dual-purpose hemp (cannabis sativa). Canadian Biosystems Engineering 45:2.1-2.7.
Liu, J. and Y. Chen. 2000. Drying rate of hemp conditioned with a forage conditioner. Canadian Agricultural Engineering 42(4):201-204.  

ASABE Conference Papers by Searching Author Jude Liu